Spring容器的工具类

package com.ht.util;

import java.util.Map;

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

public class SpringContextUtil implements ApplicationContextAware {

private static ApplicationContext applicationContext = null;

@Override
public void setApplicationContext(ApplicationContext arg0) throws BeansException {
applicationContext = arg0;
System.out.println("applicationContext配置文件加载成功!!!!");
}

/**
* @Title: getApplicationContext
* @Description: 获取应用上下文环境
* @return
*/
public static ApplicationContext getApplicationContext() {
checkApplicationContext();
return applicationContext;

}

/**
* @Title: getBean
* @Description: 根据bean对象的名字获取bean
* @param name
* @return
*/
@SuppressWarnings("unchecked")
public static <T> T getBean(String name) {
checkApplicationContext();
return (T) applicationContext.getBean(name);
}

/**
* @Title: getBean
* @Description: 用反射的方法获取bean，如果有多个符合条件的，则返回第一个
* @param clzz
* @return 返回类型
*/
public static <T> T getBean(Class<T> clzz) {
checkApplicationContext();
Map<String, T> mapBeans = applicationContext.getBeansOfType(clzz);
if (mapBeans != null && !mapBeans.isEmpty()) {
return (T) mapBeans.values().iterator().next();
} else {
return null;
}
}

/**
* @Title: checkApplicationContext
* @Description: 检查applicationContext是否初始化
* @return 返回类型
*/
public static void checkApplicationContext() {
if (applicationContext == null) {
throw new IllegalStateException("applicationContext.xml文件没有加载或者SpringContextUtil没有在applicationContext.xml中注入！！！！！");
}
}
}

package com.shareboxes.test;

import org.junit.BeforeClass;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.shareboxes.model.Student;
import com.shareboxes.util.springUtil;

public class testSpringUtil {

@BeforeClass
public  static void load(){
@SuppressWarnings("unused")
ApplicationContext aContext=new ClassPathXmlApplicationContext(new String[]{"mvcContext.xml"});
}

@Test
public void testUtil(){
Student student=springUtil.getBean("student");//用spring工具类获取Student对象
System.out.println(student);

}
}