1、ApplicationContext对象

ApplicationContext ac = new FileSystemXmlApplicationContext("applicationContext.xml"); ac.getBean("beanId");

说明：Spring框架程序通过配置文件手工初始化Spring的情况。

2、通过Spring提供的工具类获取ApplicationContext对象

ApplicationContext ac1 = WebApplicationContextUtils.getRequiredWebApplicationContext(ServletContext sc); ApplicationContext ac2 = WebApplicationContextUtils.getWebApplicationContext(ServletContext sc); ac1.getBean("beanId"); ac2.getBean("beanId");

说明：通过ServletContext对象获取ApplicationContext对象，然后在通过它获取需要的类实例。

3、实现接口ApplicationContextAware

说明：实现该接口的setApplicationContext(ApplicationContext context)方法，并保存ApplicationContext 对象。Spring初始化时，会通过该方法将ApplicationContext对象注入。

package com.liu.util;

import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextAware;

public class SpringContextUtil 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) {	SpringContextUtil.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 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 getBean(Class
      
        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");	}}
      
     
    

}

4、通过Spring提供的ContextLoader

WebApplicationContext wac = ContextLoader.getCurrentWebApplicationContext();

5、继承自抽象类ApplicationObjectSupport

说明：抽象类ApplicationObjectSupport提供getApplicationContext()方法，可以方便的获取ApplicationContext。 Spring初始化时，会通过该抽象类的setApplicationContext(ApplicationContext context)方法将ApplicationContext 对象注入。

6、继承自抽象类WebApplicationObjectSupport

说明：类似上面方法，调用getWebApplicationContext()获取WebApplicationContext