Java类获取Spring中bean的5种方式

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

import org.springframework.web.context.support.WebApplicationContextUtils;
ApplicationContext ac1 = WebApplicationContextUtils.getRequiredWebApplicationContext(ServletContext sc);
ApplicationContext ac2 = WebApplicationContextUtils.getWebApplicationContext(ServletContext sc);
ac1.getBean("beanId");
ac2.getBean("beanId");

package com.ghj.tool;

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

public class SpringConfigTool implements ApplicationContextAware {// extends ApplicationObjectSupport{

 private static ApplicationContext ac = null;
 private static SpringConfigTool springConfigTool = null;

 public synchronized static SpringConfigTool init() {
 if (springConfigTool == null) {
  springConfigTool = new SpringConfigTool();
 }
 return springConfigTool;
 }

 public void setApplicationContext(ApplicationContext applicationContext)throws BeansException {
 ac = applicationContext;
 }

 public synchronized static Object getBean(String beanName) {
 return ac.getBean(beanName);
 }
}

import org.springframework.web.context.ContextLoader; 
import org.springframework.web.context.WebApplicationContext; 
 
WebApplicationContext wac = ContextLoader.getCurrentWebApplicationContext(); 
wac.getBean(beanID);