普通java類獲取 spring中的bean方法

編寫一個工具類

 實現spring 的ApplicationContextAware接口

代碼以下：

package com.evideostb.billsystem.utils;

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

/**
 * 以靜態變量保存Spring ApplicationContext, 可在任何代碼任何地方任什麼時候候中取出ApplicaitonContext.
 * @author zhangchuanzhao
 * 2016-6-12 上午11:04:46
 */
public class SpringContextHolder implements ApplicationContextAware {
	private static ApplicationContext applicationContext;

	/**
	 * 實現ApplicationContextAware接口的context注入函數, 將其存入靜態變量.
	 */
	public void setApplicationContext(ApplicationContext applicationContext) {
		SpringContextHolder.applicationContext = applicationContext; // NOSONAR
	}

	/**
	 * 取得存儲在靜態變量中的ApplicationContext.
	 */
	public static ApplicationContext getApplicationContext() {
		checkApplicationContext();
		return applicationContext;
	}

	/**
	 * 從靜態變量ApplicationContext中取得Bean, 自動轉型爲所賦值對象的類型.
	 */
	@SuppressWarnings("unchecked")
	public static <T> T getBean(String name) {
		checkApplicationContext();
		return (T) applicationContext.getBean(name);
	}

	/**
	 * 從靜態變量ApplicationContext中取得Bean, 自動轉型爲所賦值對象的類型.
	 */
	@SuppressWarnings("unchecked")
	public static <T> T getBean(Class<T> clazz) {
		checkApplicationContext();
		return (T) applicationContext.getBeansOfType(clazz);
	}

	/**
	 * 清除applicationContext靜態變量.
	 */
	public static void cleanApplicationContext() {
		applicationContext = null;
	}

	@SuppressWarnings("resource")
	private static void checkApplicationContext() {
		new ClassPathXmlApplicationContext("SpringMVC-servlet.xml");
		if (applicationContext == null) {
			throw new IllegalStateException(
					"applicationContext未注入,請在applicationContext.xml中定義SpringContextHolder");
		}
	}
}

而後須要在application中把把org.springframework.context.ApplicationContext做爲屬性注入給類

其實只須要這樣寫就能夠以下：

<bean class="com.evideostb.billsystem.utils.SpringContextHolder" lazy-init="false" />

這樣子就是被注入進去了

運行的時候只須要加載你的applicationContext.xml

*普通java類main方法這樣調用

new ClassPathXmlApplicationContext("applicationContext.xml");

CommonService commonService = (CommonService) SpringContextHolder.getBean("commonService");

*web工程直接調用

CommonService commonService = (CommonService) SpringContextHolder.getBean("commonService");