如何取得Spring管理的bean （请用第3种方法）1、servlet方式加载时，【web.xml】
Xml代码 <servlet> <servlet-name>springMVC</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath*:/springMVC.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> [xml] view plain copy <servlet> <servlet-name>springMVC</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath*:/springMVC.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet>spring容器放在ServletContext中的key是org.springframework.web.servlet.FrameworkServlet.CONTEXT.springMVC注意后面的springMVC，是你的servlet-name配置的值，注意适时修改。
Java代码 ServletContext sc=略 WebApplicationContext attr = (WebApplicationContext)sc.getAttribute("org.springframework.web.servlet.FrameworkServlet.CONTEXT.springMVC"); [java] view plain copy ServletContext sc=略 WebApplicationContext attr = (WebApplicationContext)sc.getAttribute("org.springframework.web.servlet.FrameworkServlet.CONTEXT.springMVC");2、listener方式加载时：【web.xml】
Xml代码 <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/applicationContext</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> [xml] view plain copy <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/applicationContext</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener>【jsp/servlet】可以这样取得
Java代码 ServletContext context = getServletContext(); WebApplicationContext applicationContext = WebApplicationContextUtils .getWebApplicationContext(context); [java] view plain copy ServletContext context = getServletContext(); WebApplicationContext applicationContext = WebApplicationContextUtils .getWebApplicationContext(context);3、通用的方法来了，神器啊，前的 1、2两种方法并不通用，可以抛弃了。在配置文件中加入：
Xml代码 <!-- 用于持有ApplicationContext,可以使用SpringContextHolder.getBean('xxxx')的静态方法得到spring bean对象 --> <bean class="com.xxxxx.SpringContextHolder" lazy-init="false" /> [xml] view plain copy <!-- 用于持有ApplicationContext,可以使用SpringContextHolder.getBean('xxxx')的静态方法得到spring bean对象 --> <bean class="com.xxxxx.SpringContextHolder" lazy-init="false" /> Java代码 import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextAware; /** * 以静态变量保存Spring ApplicationContext, 可在任何代码任何地方任何时候中取出ApplicaitonContext. * */ public class SpringContextHolder implements ApplicationContextAware { private static ApplicationContext applicationContext; /** * 实现ApplicationContextAware接口的context注入函数, 将其存入静态变量. */ public void setApplicationContext(ApplicationContext applicationContext) { SpringContextHolder.applicationContext = applicationContext; // NOSONAR } /** * 取得存储在静态变量中的ApplicationContext. */ public static ApplicationContext getApplicationContext() { checkApplicationContext(); return applicationContext; } /** * 从静态变量ApplicationContext中取得Bean, 自动转型为所赋值对象的类型. */ @SuppressWarnings("unchecked") public static <T> T getBean(String name) { checkApplicationContext(); return (T) applicationContext.getBean(name); } /** * 从静态变量ApplicationContext中取得Bean, 自动转型为所赋值对象的类型. */ @SuppressWarnings("unchecked") public static <T> T getBean(Class<T> clazz) { checkApplicationContext(); return (T) applicationContext.getBeansOfType(clazz); } /** * 清除applicationContext静态变量. */ public static void cleanApplicationContext() { applicationContext = null; } private static void checkApplicationContext() { if (applicationContext == null) { throw new IllegalStateException("applicaitonContext未注入,请在applicationContext.xml中定义SpringContextHolder"); } } } [java] view plain copy import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextAware; /** * 以静态变量保存Spring ApplicationContext, 可在任何代码任何地方任何时候中取出ApplicaitonContext. * */ public class SpringContextHolder implements ApplicationContextAware { private static ApplicationContext applicationContext; /** * 实现ApplicationContextAware接口的context注入函数, 将其存入静态变量. */ public void setApplicationContext(ApplicationContext applicationContext) { SpringContextHolder.applicationContext = applicationContext; // NOSONAR } /** * 取得存储在静态变量中的ApplicationContext. */ public static ApplicationContext getApplicationContext() { checkApplicationContext(); return applicationContext; } /** * 从静态变量ApplicationContext中取得Bean, 自动转型为所赋值对象的类型. */ @SuppressWarnings("unchecked") public static <T> T getBean(String name) { checkApplicationContext(); return (T) applicationContext.getBean(name); } /** * 从静态变量ApplicationContext中取得Bean, 自动转型为所赋值对象的类型. */ @SuppressWarnings("unchecked") public static <T> T getBean(Class<T> clazz) { checkApplicationContext(); return (T) applicationContext.getBeansOfType(clazz); } /** * 清除applicationContext静态变量. */ public static void cleanApplicationContext() { applicationContext = null; } private static void checkApplicationContext() { if (applicationContext == null) { throw new IllegalStateException("applicaitonContext未注入,请在applicationContext.xml中定义SpringContextHolder"); } } }