Spring boot將配置屬性注入到bean 專題

時間 2020-05-29

標籤 spring boot 配置屬性注入 bean 專題欄目 Spring 简体版

原文原文鏈接

https://blog.csdn.net/wangmx1993328/article/details/81002901html

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2019-01-29 00:14:04.856 ERROR 10988 --- [           main] o.s.boot.SpringApplication               : Application startup failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'authorSettings': Could not bind properties to AuthorSettings (prefix=info.author, ignoreInvalidFields=false, ignoreUnknownFields=true, ignoreNestedProperties=false); nested exception is javax.validation.ValidationException: HV000029: Constraint factory returned null when trying to create instance of org.hibernate.validator.internal.constraintvalidators.bv.MaxValidatorForNumber.
	at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:336) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:292) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:407) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1623) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:481) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:312) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:308) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867) ~[spring-context-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) ~[spring-context-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:121) [spring-boot-test-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:98) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:83) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:189) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:131) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:230) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:228) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:287) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) [junit-4.12.jar:4.12]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:289) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:247) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) [junit-4.12.jar:4.12]
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) [junit-4.12.jar:4.12]
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) [junit-4.12.jar:4.12]
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) [junit-4.12.jar:4.12]
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) [junit-4.12.jar:4.12]
	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363) [junit-4.12.jar:4.12]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137) [junit-4.12.jar:4.12]
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68) [junit-rt.jar:na]
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47) [junit-rt.jar:na]
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242) [junit-rt.jar:na]
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70) [junit-rt.jar:na]
Caused by: javax.validation.ValidationException: HV000029: Constraint factory returned null when trying to create instance of org.hibernate.validator.internal.constraintvalidators.bv.MaxValidatorForNumber.
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintValidatorManager.createAndInitializeValidator(ConstraintValidatorManager.java:181) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintValidatorManager.getInitializedValidator(ConstraintValidatorManager.java:122) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getConstraintValidatorNoUnwrapping(ConstraintTree.java:303) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getConstraintValidatorInstanceForAutomaticUnwrapping(ConstraintTree.java:244) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getInitializedConstraintValidator(ConstraintTree.java:163) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:116) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:87) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.metadata.core.MetaConstraint.validateConstraint(MetaConstraint.java:73) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateMetaConstraint(ValidatorImpl.java:621) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraint(ValidatorImpl.java:584) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForSingleDefaultGroupElement(ValidatorImpl.java:528) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForDefaultGroup(ValidatorImpl.java:496) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForCurrentGroup(ValidatorImpl.java:461) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateInContext(ValidatorImpl.java:411) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validate(ValidatorImpl.java:208) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.springframework.validation.beanvalidation.SpringValidatorAdapter.validate(SpringValidatorAdapter.java:103) ~[spring-context-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.validation.DataBinder.validate(DataBinder.java:878) ~[spring-context-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.boot.bind.PropertiesConfigurationFactory.doBindPropertiesToTarget(PropertiesConfigurationFactory.java:289) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.boot.bind.PropertiesConfigurationFactory.bindPropertiesToTarget(PropertiesConfigurationFactory.java:250) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:331) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	... 42 common frames omitted

2019-01-29 00:14:04.865 ERROR 10988 --- [           main] o.s.test.context.TestContextManager      : Caught exception while allowing TestExecutionListener [org.springframework.test.context.web.ServletTestExecutionListener@37374a5e] to prepare test instance [com.tangcheng.learning.custom.AuthorSettingsTest@14b0b7f9]

java.lang.IllegalStateException: Failed to load ApplicationContext
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124) ~[spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:83) ~[spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:189) ~[spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:131) ~[spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:230) ~[spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:228) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:287) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) [junit-4.12.jar:4.12]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:289) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:247) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) [junit-4.12.jar:4.12]
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) [junit-4.12.jar:4.12]
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) [junit-4.12.jar:4.12]
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) [junit-4.12.jar:4.12]
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) [junit-4.12.jar:4.12]
	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363) [junit-4.12.jar:4.12]
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191) [spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137) [junit-4.12.jar:4.12]
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68) [junit-rt.jar:na]
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47) [junit-rt.jar:na]
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242) [junit-rt.jar:na]
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70) [junit-rt.jar:na]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'authorSettings': Could not bind properties to AuthorSettings (prefix=info.author, ignoreInvalidFields=false, ignoreUnknownFields=true, ignoreNestedProperties=false); nested exception is javax.validation.ValidationException: HV000029: Constraint factory returned null when trying to create instance of org.hibernate.validator.internal.constraintvalidators.bv.MaxValidatorForNumber.
	at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:336) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:292) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:407) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1623) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:481) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:312) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:308) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) ~[spring-beans-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867) ~[spring-context-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) ~[spring-context-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:121) ~[spring-boot-test-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:98) ~[spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116) ~[spring-test-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	... 24 common frames omitted
Caused by: javax.validation.ValidationException: HV000029: Constraint factory returned null when trying to create instance of org.hibernate.validator.internal.constraintvalidators.bv.MaxValidatorForNumber.
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintValidatorManager.createAndInitializeValidator(ConstraintValidatorManager.java:181) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintValidatorManager.getInitializedValidator(ConstraintValidatorManager.java:122) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getConstraintValidatorNoUnwrapping(ConstraintTree.java:303) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getConstraintValidatorInstanceForAutomaticUnwrapping(ConstraintTree.java:244) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getInitializedConstraintValidator(ConstraintTree.java:163) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:116) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:87) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.metadata.core.MetaConstraint.validateConstraint(MetaConstraint.java:73) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateMetaConstraint(ValidatorImpl.java:621) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraint(ValidatorImpl.java:584) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForSingleDefaultGroupElement(ValidatorImpl.java:528) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForDefaultGroup(ValidatorImpl.java:496) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForCurrentGroup(ValidatorImpl.java:461) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateInContext(ValidatorImpl.java:411) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.hibernate.validator.internal.engine.ValidatorImpl.validate(ValidatorImpl.java:208) ~[hibernate-validator-5.3.6.Final.jar:5.3.6.Final]
	at org.springframework.validation.beanvalidation.SpringValidatorAdapter.validate(SpringValidatorAdapter.java:103) ~[spring-context-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.validation.DataBinder.validate(DataBinder.java:878) ~[spring-context-4.3.21.RELEASE.jar:4.3.21.RELEASE]
	at org.springframework.boot.bind.PropertiesConfigurationFactory.doBindPropertiesToTarget(PropertiesConfigurationFactory.java:289) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.boot.bind.PropertiesConfigurationFactory.bindPropertiesToTarget(PropertiesConfigurationFactory.java:250) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:331) ~[spring-boot-1.5.18.RELEASE.jar:1.5.18.RELEASE]
	... 42 common frames omitted


java.lang.IllegalStateException: Failed to load ApplicationContext

	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124)
	at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:83)
	at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:189)
	at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:131)
	at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:230)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:228)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:287)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:289)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:247)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'authorSettings': Could not bind properties to AuthorSettings (prefix=info.author, ignoreInvalidFields=false, ignoreUnknownFields=true, ignoreNestedProperties=false); nested exception is javax.validation.ValidationException: HV000029: Constraint factory returned null when trying to create instance of org.hibernate.validator.internal.constraintvalidators.bv.MaxValidatorForNumber.
	at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:336)
	at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:292)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:407)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1623)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:481)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:312)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:308)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:303)
	at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:121)
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:98)
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116)
	... 24 more
Caused by: javax.validation.ValidationException: HV000029: Constraint factory returned null when trying to create instance of org.hibernate.validator.internal.constraintvalidators.bv.MaxValidatorForNumber.
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintValidatorManager.createAndInitializeValidator(ConstraintValidatorManager.java:181)
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintValidatorManager.getInitializedValidator(ConstraintValidatorManager.java:122)
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getConstraintValidatorNoUnwrapping(ConstraintTree.java:303)
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getConstraintValidatorInstanceForAutomaticUnwrapping(ConstraintTree.java:244)
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getInitializedConstraintValidator(ConstraintTree.java:163)
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:116)
	at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:87)
	at org.hibernate.validator.internal.metadata.core.MetaConstraint.validateConstraint(MetaConstraint.java:73)
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateMetaConstraint(ValidatorImpl.java:621)
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraint(ValidatorImpl.java:584)
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForSingleDefaultGroupElement(ValidatorImpl.java:528)
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForDefaultGroup(ValidatorImpl.java:496)
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForCurrentGroup(ValidatorImpl.java:461)
	at org.hibernate.validator.internal.engine.ValidatorImpl.validateInContext(ValidatorImpl.java:411)
	at org.hibernate.validator.internal.engine.ValidatorImpl.validate(ValidatorImpl.java:208)
	at org.springframework.validation.beanvalidation.SpringValidatorAdapter.validate(SpringValidatorAdapter.java:103)
	at org.springframework.validation.DataBinder.validate(DataBinder.java:878)
	at org.springframework.boot.bind.PropertiesConfigurationFactory.doBindPropertiesToTarget(PropertiesConfigurationFactory.java:289)
	at org.springframework.boot.bind.PropertiesConfigurationFactory.bindPropertiesToTarget(PropertiesConfigurationFactory.java:250)
	at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:331)
	... 42 more


Process finished with exit code -1

@ConfigurationProperties和@value都是將外部屬性注入到對象

@ConfigurationProperties很方便使用。比用@value註解好嗎? 在特定的方案中是的,這只是一個選擇問題

@EnableConfigurationProperties //開啓屬性注入,有此註解就能夠經過@autowired注入，是配合@ConfigurationProperties使用的。
若是沒有@EnableConfigurationProperties，則使用@ConfigurationProperties註解的class上面還須要添加@Component（@Component的包裝註解，譬如java

@Configuration、@Service也能夠。但本質仍是註解@Component）mysql

@EnableAutoConfiguration在Spring boot中是啓動自動配置的（Auto-configuration tries to be as intelligent as possible and will back-away as you define more of your own configuration.）git

yml：
map結構：web

myProps: #自定義的屬性和值  
  simpleProp: simplePropValue  
  arrayProps: 1,2,3,4,5  
  listProp1:   #List中的元素是Map
    - name: abc  
      value: abcValue  
    - name: efg  
      value: efgValue  
  listProp2:  
    - config2Value1  
    - config2Vavlue2  
  mapProps:  
    key1: value1  
    key2: value2

@Component  
@ConfigurationProperties(prefix="myProps") //接收application.yml中的myProps下面的屬性  
public class MyProps {  
    private String simpleProp;  
    private String[] arrayProps;  
    private List<Map<String, String>> listProp1 = new ArrayList<>(); //接收prop1裏面的屬性值,List中的元素是Map  
    private List<String> listProp2 = new ArrayList<>(); //接收prop2裏面的屬性值  
    private Map<String, String> mapProps = new HashMap<>(); //接收prop1裏面的屬性值  
      
    public String getSimpleProp() {  
        return simpleProp;  
    }  
      
    //String類型的必定須要setter來接收屬性值；maps, collections, 和 arrays 不須要  
    public void setSimpleProp(String simpleProp) {  
        this.simpleProp = simpleProp;  
    }  
      
    public List<Map<String, String>> getListProp1() {  
        return listProp1;  
    }  
    public List<String> getListProp2() {  
        return listProp2;  
    }  
  
    public String[] getArrayProps() {  
        return arrayProps;  
    }  
  
    public void setArrayProps(String[] arrayProps) {  
        this.arrayProps = arrayProps;  
    }  
  
    public Map<String, String> getMapProps() {  
        return mapProps;  
    }  
  
    public void setMapProps(Map<String, String> mapProps) {  
        this.mapProps = mapProps;  
    }  
}

http://blog.csdn.net/clementad/article/details/51970962正則表達式

Take a look at the javadoc for ConfigurationProperties for more information on its various configuration options. For example, you can set a prefix to divide your configuration into a number of different namespaces:spring

@ConfigurationProperties(prefix="foo")
For the binding to work, you'd then have to use the same prefix on the properties declared in application.properties:sql

foo.users.alice=alpha
foo.users.bob=bravo瀏覽器

注入到Map類型的users字段中， alice和bob是map結構的key，等號後面的是value

tomcat

1、@ConfigurationProperties註解的使用

看配置文件，個人是yaml格式的配置：

// file application.yml my: servers:  - dev.bar.com - foo.bar.com - jiaobuchong.com

下面我要將上面的配置屬性注入到一個Java Bean類中，看碼：

import org.springframework.boot.context.properties.ConfigurationProperties; import org.springframework.stereotype.Component; import java.util.ArrayList; import java.util.List;  @Component //不加這個註解的話, 使用@Autowired 就不能注入進去了 @ConfigurationProperties(prefix = "my") // 配置文件中的前綴 public class MyConfig { private List<String> servers = new ArrayList<String>(); public List<String> getServers() { return this.servers; } }

下面寫一個Controller來測試一下：

@RequestMapping("/test") @RestController public class HelloController { @Autowired private MyConfig myConfig; @RequestMapping("/config") public Object getConfig() { return myConfig.getServers(); } }

下面運行Application.java的main方法跑一下看看：

@SpringBootApplication public class Application { public static void main(String[] args) { // 啓動Spring Boot項目的惟一入口 SpringApplication app = new SpringApplication(Application.class); app.setBannerMode(Banner.Mode.OFF); app.run(args); }

在瀏覽器的地址欄裏輸入：
localhost:8080/test/config 獲得：
[「dev.bar.com」,」foo.bar.com」,」jiaobuchong.com」]

@EnableAutoConfiguration

/**
 * Enable auto-configuration of the Spring Application Context, attempting to guess and configure beans that you are likely to need. Auto-configuration classes are usually

 * applied based on your classpath and what beans you have defined. For example, If you
 * have {@code tomcat-embedded.jar} on your classpath you are likely to want a
 * {@link TomcatEmbeddedServletContainerFactory} (unless you have defined your own
 * {@link EmbeddedServletContainerFactory} bean).
 * <p>
 * Auto-configuration tries to be as intelligent as possible and will back-away as you
 * define more of your own configuration. You can always manually {@link #exclude()} any
 * configuration that you never want to apply (use {@link #excludeName()} if you don't
 * have access to them). You can also exclude them via the
 * {@code spring.autoconfigure.exclude} property. Auto-configuration is always applied
 * after user-defined beans have been registered.
 * <p>
 * The package of the class that is annotated with {@code @EnableAutoConfiguration} has
 * specific significance and is often used as a 'default'. For example, it will be used
 * when scanning for {@code @Entity} classes. It is generally recommended that you place
 * {@code @EnableAutoConfiguration} in a root package so that all sub-packages and classes
 * can be searched.
 * <p>
 * Auto-configuration classes are regular Spring {@link Configuration} beans. They are
 * located using the {@link SpringFactoriesLoader} mechanism (keyed against this class).
 * Generally auto-configuration beans are {@link Conditional @Conditional} beans (most
 * often using {@link ConditionalOnClass @ConditionalOnClass} and
 * {@link ConditionalOnMissingBean @ConditionalOnMissingBean} annotations).
 *
 * @author Phillip Webb
 * @author Stephane Nicoll
 * @see ConditionalOnBean
 * @see ConditionalOnMissingBean
 * @see ConditionalOnClass
 * @see AutoConfigureAfter
 */
@SuppressWarnings("deprecation")
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@AutoConfigurationPackage
@Import(EnableAutoConfigurationImportSelector.class)
public @interface EnableAutoConfiguration {

2、@ConfigurationProperties和@EnableConfigurationProperties註解結合使用

在spring boot中使用yaml進行配置的通常步驟是，
一、yaml配置文件，這裏假設：

my: webserver: #HTTP 監聽端口 port: 80 #嵌入Web服務器的線程池配置 threadPool: maxThreads: 100 minThreads: 8 idleTimeout: 60000

二、

//file MyWebServerConfigurationProperties.java
import org.springframework.boot.context.properties.ConfigurationProperties;

@ConfigurationProperties(prefix = "my.webserver")  //沒有使用@Component或@Confinguration，所以此對象不會註冊到Spring容器中，須要@EnableConfigurationProperties引用
public class MyWebServerConfigurationProperties {
    private int port;
    private ThreadPool threadPool;

    public int getPort() {
        return port;
    }

    public void setPort(int port) {
        this.port = port;
    }

    public ThreadPool getThreadPool() {
        return threadPool;
    }

    public void setThreadPool(ThreadPool threadPool) {
        this.threadPool = threadPool;
    }

    public static class ThreadPool {
        private int maxThreads;
        private int minThreads;
        private int idleTimeout;

        public int getIdleTimeout() {
            return idleTimeout;
        }

        public void setIdleTimeout(int idleTimeout) {
            this.idleTimeout = idleTimeout;
        }

        public int getMaxThreads() {
            return maxThreads;
        }

        public void setMaxThreads(int maxThreads) {
            this.maxThreads = maxThreads;
        }

        public int getMinThreads() {
            return minThreads;
        }

        public void setMinThreads(int minThreads) {
            this.minThreads = minThreads;
        }
    }
}

三、

// file: MyWebServerConfiguration.java
import org.springframework.context.annotation.Configuration;
import org.springframework.boot.context.properties.EnableConfigurationProperties;

@Configuration
@EnableConfigurationProperties(MyWebServerConfigurationProperties.class)
public class MyWebServerConfiguration {
    @Autowired
    private MyWebServerConfigurationProperties properties;
    /**
     *下面就能夠引用MyWebServerConfigurationProperties類       裏的配置了
    */
   public void setMyconfig() {
       String port = properties.getPort();
       // ...........
   }   
}

The @EnableConfigurationProperties annotation is automatically applied to your project so that any beans annotated with @ConfigurationProperties will be configured from the Environment properties. This style of configuration works particularly well with the SpringApplication external YAML configuration.(引自spring boot官方手冊)

3、@Bean配置第三方組件(Third-party configuration)

建立一個bean類：

// file ThreadPoolBean.java
public class ThreadPoolBean {
    private int maxThreads;
    private int minThreads;
    private int idleTimeout;

    public int getMaxThreads() {
        return maxThreads;
    }

    public void setMaxThreads(int maxThreads) {
        this.maxThreads = maxThreads;
    }

    public int getMinThreads() {
        return minThreads;
    }

    public void setMinThreads(int minThreads) {
        this.minThreads = minThreads;
    }

    public int getIdleTimeout() {
        return idleTimeout;
    }

    public void setIdleTimeout(int idleTimeout) {
        this.idleTimeout = idleTimeout;
    }
}

引用前面第二部分寫的配置類：MyWebServerConfiguration.java和MyWebServerConfigurationProperties.java以及yaml配置文件,如今修改MyWebServerConfiguration.java類：

import com.jiaobuchong.springboot.domain.ThreadPoolBean; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.context.properties.EnableConfigurationProperties; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration;  @Configuration //這是一個配置類，與@Service、@Component的效果相似。spring會掃描到這個類，@Bean纔會生效，將ThreadPoolBean這個返回值類註冊到spring上下文環境中 @EnableConfigurationProperties(MyWebServerConfigurationProperties.class) //經過這個註解, 將MyWebServerConfigurationProperties這個類的配置到上下文環境中,本類中使用的@Autowired註解注入才能生效 public class MyWebServerConfiguration { @SuppressWarnings("SpringJavaAutowiringInspection") //加這個註解讓IDE 不報: Could not autowire @Autowired private MyWebServerConfigurationProperties properties; @Bean //@Bean註解在方法上,返回值是一個類的實例,並聲明這個返回值(返回一個對象)是spring上下文環境中的一個bean public ThreadPoolBean getThreadBean() { MyWebServerConfigurationProperties.ThreadPool threadPool = properties.getThreadPool(); ThreadPoolBean threadPoolBean = new ThreadPoolBean(); threadPoolBean.setIdleTimeout(threadPool.getIdleTimeout()); threadPoolBean.setMaxThreads(threadPool.getMaxThreads()); threadPoolBean.setMinThreads(threadPool.getMinThreads()); return threadPoolBean; } }

被@Configuration註解標識的類，一般做爲一個配置類，這就相似於一個xml文件，表示在該類中將配置Bean元數據，其做用相似於Spring裏面application-context.xml的配置文件，而@Bean標籤，則相似於該xml文件中，聲明的一個bean實例。

寫一個controller測試一下：

import com.jiaobuchong.springboot.domain.ThreadPoolBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RequestMapping("/first")
@RestController
public class HelloController {
    @Autowired
    private ThreadPoolBean threadPoolBean;
    @RequestMapping("/testbean")
    public Object getThreadBean() {
        return threadPoolBean;
    }
}

運行Application.java的main方法，
在瀏覽器裏輸入：http://localhost:8080/first/testbean
獲得的返回值是：
{「maxThreads」:100,」minThreads」:8,」idleTimeout」:60000}

http://blog.csdn.net/jiaobuchong/article/details/50442709

el最經常使用的幾種使用場景：

從配置文件中讀取屬性
缺失值狀況下，配置默認值
el內部字符串使用String的方法
三目運算符
正則表達式
注入系統屬性（system properties）
調用系統原有函數
直接注入文件進行操做
讀取另外一個bean的函數的返回值

一、從配置文件中讀取屬性

application.properties

name=\u8D75\u8BA1\u521A

1     @Value("${name}")//這裏必須使用$，使用#是不行的
2     private String name;
3     @RequestMapping(value = "/name", method = RequestMethod.GET)
4     public String getName() {
5         return name;
6     }

注意：記住下邊三句話

${}不支持表達式（三目表達式不算表達式）；#{}支持
${}讀取屬性文件的值
${}讀取最後一個知足條件的值；#{}讀取全部知足條件的值

二、缺失值狀況下，配置默認值

1     @Value("${name2:'剛子'}")//這裏必須使用$，使用#是不行的
2     private String name2;
3     @RequestMapping(value = "/name2", method = RequestMethod.GET)
4     public String getName2() {
5         return name2;
6     }

三、el內部字符串使用String的方法

1 name.list=\u8D75\u8BA1\u521A,\u738B\u5A1C

1     @Value("#{'${name.list}'.split(',')}")
2     private List<String> nameList;
3     @RequestMapping(value = "/nameList", method = RequestMethod.GET)
4     public List<String> getNameList() {
5         return nameList;
6     }

四、三目運算符

1 name.three=\u6768\u8FC7

1     @RequestMapping(value = "/nameThree", method = RequestMethod.GET)
2     public String getNameThree(@Value("${name.three!='楊過'?'黃蓉':'小龍女'}") String nameThree) {
3         return nameThree;
4     }

注意：@value能夠直接做爲入參

五、正則表達式

1     @Value("#{'100' matches '\\d+'}")//這裏必須使用#，使用$是不行的
2     private boolean isDigital;
3     @RequestMapping(value = "/nameRegEx", method = RequestMethod.GET)
4     public boolean getNameRegEx() {
5         return isDigital;
6     }

六、注入系統屬性

1     @Value("#{systemProperties['os.name']}")//這裏必須使用#，使用$是不行的
2     private String osName;
3     @RequestMapping(value = "/osName", method = RequestMethod.GET)
4     public String getOsName() {
5         return osName;
6     }

七、調用系統原有函數

1     @Value("#{T(java.lang.Math).random() * 10}")//注意：這裏只生成一次，以後你不管調用多少次getRandomValue()，都返回同一個值
2     private String randomValue;
3     @RequestMapping(value = "/randomValue", method = RequestMethod.GET)
4     public String getRandomValue() {
5         return randomValue;
6     }

八、直接注入文件進行操做

testfile/testEl.txt

1 喬峯--降龍十八掌
2 楊過--黯然銷魂掌

 1     @Value("classpath:testfile/testEl.txt")
 2     private Resource txtResource;
 3     @RequestMapping(value = "/resource", method = RequestMethod.GET)
 4     public String getResource() {
 5         try {
 6             return IOUtils.toString(txtResource.getInputStream(), "UTF-8");
 7         } catch (IOException e) {
 8             ExceptionUtils.getStackTrace(e);
 9         }
10         return StringUtils.EMPTY;
11     }

注意：這個很重要，操做文件使用Apache.commons.io.IOUtils來操做。

九、讀取另外一個bean的函數的返回值

1 @Component("eLComponent")
2 public class ELComponent {
3     public String getNameBean(){
4         return "喬峯";
5     }
6 }

1     @Value("#{eLComponent.getNameBean()}")//這裏必須使用#，使用$是不行的
2     private String nameBean;
3     @RequestMapping(value = "/nameBean", method = RequestMethod.GET)
4     public String getNameBean() {
5         return nameBean;
6     }

注意：被調用bean最好指定一下beanName。

http://www.cnblogs.com/java-zhao/archive/2016/07/01/5633881.html

application.properties中的配置：

db.driverClassName=com.mysql.jdbc.Driver
db.url=jdbc:mysql://localhost:3306/mydb?characterEncoding=utf-8&useSSL=false
db.username=xxx
db.password=xxx

import java.beans.PropertyVetoException;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;
import com.mchange.v2.c3p0.ComboPooledDataSource;


@Configuration
public class DBconfig {
    @Autowired
    private Environment env;

    @Bean(name="dataSource")
    public ComboPooledDataSource dataSource() throws PropertyVetoException {
        ComboPooledDataSource dataSource = new ComboPooledDataSource();
        dataSource.setDriverClass(env.getProperty("db.driverClassName"));
        dataSource.setJdbcUrl(env.getProperty("db.url"));
        dataSource.setUser(env.getProperty("db.username"));
        dataSource.setPassword(env.getProperty("db.password"));
        dataSource.setMaxPoolSize(20);
        dataSource.setMinPoolSize(5);
        dataSource.setInitialPoolSize(10);
        dataSource.setMaxIdleTime(300);
        dataSource.setAcquireIncrement(5);
        dataSource.setIdleConnectionTestPeriod(60);
        return dataSource;
    }
}

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