Spring 获取配置文件中定义的bean_springcontexutil.getbean最多-优快云博客

本文介绍了一个实用的Spring上下文工具类实现，该工具类能够帮助开发者方便地获取Spring容器中的Bean实例，检查Bean的存在性和类型等。通过在配置文件中的简单设置，即可在整个项目中复用此工具类。

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package users.util;

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

public class SpringContextUtil implements ApplicationContextAware {
private static ApplicationContext applicationContext; //Spring应用上下文环境

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

public static ApplicationContext getApplicationContext() {
return applicationContext;
}

public static Object getBean(String name) throws BeansException {
return applicationContext.getBean(name);
}

public static Object getBean(String name, Class requiredType) throws BeansException {
return applicationContext.getBean(name, requiredType);
}

public static boolean containsBean(String name) {
return applicationContext.containsBean(name);
}

public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
return applicationContext.isSingleton(name);
}

public static Class getType(String name) throws NoSuchBeanDefinitionException {
return applicationContext.getType(name);
}

public static String[] getAliases(String name) throws NoSuchBeanDefinitionException {
return applicationContext.getAliases(name);
}

}

注意：一定要在spring.xml中加上:
<bean id="SpringContextUtil " class="users.util.SpringContextUtil " singleton="true" />
当对SpringContextUtil 实例时就自动设置applicationContext,以便后来可直接用applicationContext

singleton 这个属性在struts1.1才支持，struts2里面已经没有这个属性了。
使用时直接 UsersDAO是自己在配置文件中定义的类
UsersDAO userDAO= (UsersDAO)SpringContextUtil.getBean("userDAO");