spring

在Spring应用中创建全局获取ApplicationContext对象

 

package com.xx.common.base;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.web.context.ContextLoader;

//配置文件中一定要加：

//<bean id="springApplicationContextHolder" class="com.letv.common.base.SpringApplicationContextHolder"></bean>

/** * Created by 8899man on 16/7/20. */ public class SpringApplicationContextHolder implements ApplicationContextAware { // Spring应用上下文环境 private static ApplicationContext applicationContext; /** * 实现ApplicationContextAware接口的回调方法，设置上下文环境 */ @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { SpringApplicationContextHolder.applicationContext = applicationContext; } public static ApplicationContext getApplicationContext() { return applicationContext; } public static Object getBean(String beanId) throws BeansException { return applicationContext.getBean(beanId); } }

　　

在Spring应用中创建全局获取ApplicationContext对象

1、需要创建一个类，实现接口ApplicationContextAware的setApplicationContext方法。

2、在创建的这个类中保存一个静态的ApplicationContext对象，然后通过静态的方法返回。

如下，下面是SpringSide的实现，供参考：

 

/**
* Copyright (c) 2005-2012 springside.org.cn
*
* Licensed under the Apache License, Version 2.0 (the "License");
*/
package org.springside.modules.test.spring;

import org.apache.commons.lang3.Validate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.DisposableBean;
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取出ApplicaitonContext.
*
* @author calvin
*/
public class SpringContextHolder implements ApplicationContextAware, DisposableBean {

private static ApplicationContext applicationContext = null;

private static Logger logger = LoggerFactory.getLogger(SpringContextHolder.class);

/**
* 取得存储在静态变量中的ApplicationContext.
*/
public static ApplicationContext getApplicationContext() {
assertContextInjected();
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.
*/
public static <T> T getBean(String name) {
assertContextInjected();
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.
*/
public static <T> T getBean(Class<T> requiredType) {
assertContextInjected();
return applicationContext.getBean(requiredType);
}

/**
* 清除SpringContextHolder中的ApplicationContext为Null.
*/
public static void clearHolder() {
logger.debug("清除SpringContextHolder中的ApplicationContext:" + applicationContext);
applicationContext = null;
}

/**
* 实现ApplicationContextAware接口, 注入Context到静态变量中.
*/
@Override
public void setApplicationContext(ApplicationContext applicationContext) {
logger.debug("注入ApplicationContext到SpringContextHolder:{}", applicationContext);

if (SpringContextHolder.applicationContext != null) {
logger.warn("SpringContextHolder中的ApplicationContext被覆盖, 原有ApplicationContext为:"
+ SpringContextHolder.applicationContext);
}

SpringContextHolder.applicationContext = applicationContext; //NOSONAR
}

/**
* 实现DisposableBean接口, 在Context关闭时清理静态变量.
*/
@Override
public void destroy() throws Exception {
SpringContextHolder.clearHolder();
}

/**
* 检查ApplicationContext不为空.
*/
private static void assertContextInjected() {
Validate.validState(applicationContext != null,
"applicaitonContext属性未注入, 请在applicationContext.xml中定义SpringContextHolder.");
}
}