SpringBoot中普通類沒法經過@Autowired自動注入Service、dao等bean解決方法

沒法注入緣由：

 

有的時候咱們有一些類並不想注入Spring容器中，有Spring容器實例化，可是咱們又想使用Spring容器中的一些對象，因此就只能藉助工具類來獲取了

 

 

工具類：

package com.mikey.design.utils; import org.springframework.beans.BeansException; import org.springframework.beans.factory.NoSuchBeanDefinitionException; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextAware; import org.springframework.stereotype.Component; /** * @author Mikey * @Title: * @Description: * @Email:1625017540@qq.com * @date 2018/12/3 21:57 * @Version 1.0 */ @Component public class SpringUtil implements ApplicationContextAware { private static ApplicationContext applicationContext = null; public SpringUtil() { } public void setApplicationContext(ApplicationContext arg0) throws BeansException { if (applicationContext == null) { applicationContext = arg0; } } public static ApplicationContext getApplicationContext() { return applicationContext; } public static void setAppCtx(ApplicationContext webAppCtx) { if (webAppCtx != null) { applicationContext = webAppCtx; } } /** * 拿到ApplicationContext對象實例後就能夠手動獲取Bean的注入實例對象 */
    public static <T> T getBean(Class<T> clazz) { return getApplicationContext().getBean(clazz); } public static <T> T getBean(String name, Class<T> clazz) throws ClassNotFoundException { return getApplicationContext().getBean(name, clazz); } public static final Object getBean(String beanName) { return getApplicationContext().getBean(beanName); } public static final Object getBean(String beanName, String className) throws ClassNotFoundException { Class clz = Class.forName(className); return getApplicationContext().getBean(beanName, clz.getClass()); } public static boolean containsBean(String name) { return getApplicationContext().containsBean(name); } public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException { return getApplicationContext().isSingleton(name); } public static Class<?> getType(String name) throws NoSuchBeanDefinitionException { return getApplicationContext().getType(name); } public static String[] getAliases(String name) throws NoSuchBeanDefinitionException { return getApplicationContext().getAliases(name); } }

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