本文主要簡單講解框架整合的思路。html
一、Spring框架的搭建java
這個很簡單,只須要web容器中註冊org.springframework.web.context.ContextLoaderListener,並指定spring加載配置文件,那麼spring容器搭建完成。(固然org.springframework的核心jar包須要引入)git
固然爲了更加易用支持J2EE應用,通常咱們還會加上以下:web
Spring監聽HTTP請求事件:org.springframework.web.context.request.RequestContextListenerredis
<!-- spring配置文件開始 -->
<context-param>
<param-name>contextConfigLocation</param-name><!-- spring配置文件,請根據須要選取 -->
<param-value>classpath*:webconfig/service-all.xml</param-value>
</context-param>
<listener><!-- Spring負責監聽web容器啓動和關閉的事件 --><!-- Spring ApplicationContext載入 -->
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<listener><!-- Spring監聽HTTP請求事件 -->
<!-- 使spring支持request與session的scope,如: -->
<!-- <bean id="loginAction" class="com.foo.LoginAction" scope="request"/> -->
<!-- 使用: -->
<!-- 一、註解獲取:@Autowired HttpServletRequest request; -->
<!-- 二、java代碼:HttpServletRequest request =
((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest(); -->
<!-- 三、直接在參數中傳遞:public String sayHi(HttpServletRequest request) -->
<listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
</listener>
<listener><!-- Spring 刷新Introspector防止內存泄露 -->
<listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
</listener>
<filter>
<filter-name>encodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>false</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- spring配置文件結束 -->
二、Spring MVC的搭建spring
首先咱們知道Spring MVC的核心是org.springframework.web.servlet.DispatcherServlet,因此web容器中少不了它的註冊。(固然org.springframework的web、mvc包及其依賴jar包須要引入)express
<!-- spring mvc配置開始 -->
<servlet>
<servlet-name>Spring-MVC</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath*:spring/spring-mvc.xml</param-value><!-- spring mvc配置文件 -->
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Spring-MVC</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<!-- spring mvc配置結束 -->
同時爲了更好使用MVC,spring-mvc.xml須要配置如下:json
1)(可選)多部分請求解析器(MultipartResolver)配置,與上傳文件有關 須要類庫commons-io、commons-fileuploadspring-mvc
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="defaultEncoding" value="utf-8"></property><!-- 默認編碼-->
<property name="maxUploadSize" value="104857600"></property><!-- 文件大小最大值-->
<property name="maxInMemorySize" value="40960"></property><!-- 內存中的最大值-->
</bean>
2)(可選)本地化(LocaleResolver)配置
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3)(可選)主題解析器(ThemeResolver)配置
4)(必選)處理器映射器(HandlerMapping)配置,能夠配置多個,通常採用RequestMappingHandlerMapping或者自定義
這裏咱們自定義了一個處理器映射器,繼承重寫RequestMappingHandlerMapping,支持@RequestMapping無需任何path參數自動裝載類名或方法做爲url路徑匹配。
<bean id="handlerMapping"
class="io.flysium.framework.web.servlet.mvc.method.annotation.CustomHandlerMapping">
<property name="order" value="-1" />
</bean>
CustomHandlerMapping實現:
@Override
protected RequestMappingInfo getMappingForMethod(Method method, Class handlerType) {
RequestMappingInfo info = createRequestMappingInfoDefault(method);
if (info != null) {
RequestMappingInfo typeInfo = createRequestMappingInfoDefault(handlerType);
if (typeInfo != null)
info = typeInfo.combine(info);
}
return info;
}
private RequestMappingInfo createRequestMappingInfoDefault(AnnotatedElement element) {
RequestMapping requestMapping = AnnotatedElementUtils.findMergedAnnotation(element,
RequestMapping.class);
RequestCondition condition = (element instanceof Class)
? getCustomTypeCondition((Class) element)
: getCustomMethodCondition((Method) element);
/**
* 以類名和方法名映射請求,參照@RequestMapping
* 默認不須要添加任何參數(如:/className/methodName.do)
*/
String defaultName = (element instanceof Class)
? ((Class) element).getSimpleName()
: ((Method) element).getName();
return requestMapping == null
? null
: createRequestMappingInfo(requestMapping, condition, defaultName);
}
protected RequestMappingInfo createRequestMappingInfo(RequestMapping annotation,
RequestCondition<?> customCondition, String defaultName) {
String[] patterns = resolveEmbeddedValuesInPatterns(annotation.value());
if (patterns != null && (patterns.length == 0)) {
patterns = new String[]{defaultName};
}
return new RequestMappingInfo(
new PatternsRequestCondition(patterns, getUrlPathHelper(), getPathMatcher(),
this.useSuffixPatternMatch, this.useTrailingSlashMatch,
this.fileExtensions),
new RequestMethodsRequestCondition(annotation.method()),
new ParamsRequestCondition(annotation.params()),
new HeadersRequestCondition(annotation.headers()),
new ConsumesRequestCondition(annotation.consumes(), annotation.headers()),
new ProducesRequestCondition(annotation.produces(), annotation.headers(),
this.contentNegotiationManager),
customCondition);
}
5)(必選)處理器適配器(HandlerAdapter)配置,能夠配置多個,主要是配置messageConverters,其主要做用是映射前臺傳參與handler處理方法參數。通常擴展RequestMappingHandlerAdapter,或者自定義。若是咱們須要json請求的處理,這裏必須擴展。同時咱們須要注意的是日期格式的轉換。
另外Spring 4.2新特性,加之註解會自動注入@ControllerAdvice,能夠定義RequestBodyAdvice、ResponseBodyAdvice,能夠更方便地在參數處理方面着手自定義。
<bean id="handlerAdapter"
class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
<property name="order" value="-1" />
<property name="messageConverters">
<list>
<!-- <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"
/> -->
<ref bean="mappingJacksonHttpMessageConverter" />
</list>
</property>
<property name="webBindingInitializer">
<bean
class="org.springframework.web.bind.support.ConfigurableWebBindingInitializer">
<property name="conversionService">
<!-- 針對普通請求(非application/json) 前臺的日期字符串與後臺的Java Date對象轉化,
此狀況,應使用spring
mvc自己的內置日期處理 -->
<!-- 能夠在VO屬性上加註解:@DateTimeFormat 須要類庫joda-time -->
<bean
class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
</bean>
</property>
</bean>
</property>
</bean>
<!-- json請求(application/json)返回值Date轉String,全局配置 -->
<bean name="jacksonObjectMapper"
class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
<property name="featuresToDisable">
<array>
<util:constant
static-field="com.fasterxml.jackson.databind.SerializationFeature.WRITE_DATES_AS_TIMESTAMPS" />
</array>
</property>
<!-- 若是想自定義,能夠在VO屬性上加註解:@JsonFormat(shape = JsonFormat.Shape.STRING, pattern
= Consts.DATE_PATTERN.DATE_PATTERN_OBLIQUE,timezone = "GMT+8") -->
<property name="simpleDateFormat">
<value>yyyy-MM-dd HH:mm:ss</value>
</property>
</bean>
<!--避免IE執行Ajax時,返回JSON出現下載文件 -->
<!-- 自定義 -->
<bean id="mappingJacksonHttpMessageConverter"
class="io.flysium.framework.http.converter.json.CustomJackson2HttpMessageConverter">
<property name="objectMapper" ref="jacksonObjectMapper" />
<property name="supportedMediaTypes">
<list>
<value>text/html;charset=UTF-8</value>
<value>application/json;charset=UTF-8</value>
</list>
</property>
</bean>
6)(可選)處理器異常解析器(HandlerExceptionResolver)配置,能夠配置多個,配置Controller異常拋出後,咱們是怎麼樣處理的,通常須要日誌或作反饋的能夠自定義。
7)(可選)請求到視圖名翻譯器(RequestToViewNameTranslator)配置,RequestToViewNameTranslator能夠在處理器返回的View爲空時使用它根據Request得到viewName。
8)(可選)視圖解析器(ViewResolver)配置,能夠配置多個,定義跳轉的文件的先後綴 ,視圖模式配置,主要針對@Controller返回ModelAndView的視圖路徑解析,動給後面控制器的方法return的字符串 加上前綴和後綴,變成一個 可用的url地址 。
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/" />
<property name="suffix" value=".jsp" />
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView" />
</bean>
最後給Controller加入組件掃描吧,這樣減小xml配置,直接在Java代碼中加入註解便可。
<!-- 自動掃描類包,將標誌Spring註解的類自動轉化爲Bean,同時完成Bean的注入 -->
<!-- 掃描控制器 -->
<context:component-scan base-package="io.flysium" use-default-filters="false">
<context:include-filter type="annotation"
expression="org.springframework.stereotype.Controller" />
<context:include-filter type="annotation"
expression="org.springframework.web.bind.annotation.RestController" />
<context:include-filter type="annotation"
expression="org.springframework.web.bind.annotation.ControllerAdvice" />
</context:component-scan>
三、Mybatis整合
整合mybatis到Spring框架,咱們須要mybatis的jar包,及mybatis-spring整合jar包。而後在Spring容器中註冊配置org.mybatis.spring.SqlSessionFactoryBean(須要數據源,及指定Mybatis配置文件)及org.mybatis.spring.SqlSessionTemplate便可。
更多整合請參照Git項目:https://git.oschina.net/svenaugustus/app-ss4m-less
目前除了ssm,另外整合redis(支持切換單節點配置、主從哨兵配置,集羣配置)、spring session方案。
其中包括spring MVC的簡單demo,用於學習交流。
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