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在Spring里面，当一个singleton bean依赖一个prototype bean，因为singleton bean是单例的，因此prototype bean在singleton bean里面也会变成单例.
这个怎么解决呢？？？可以使用Spring提供的lookup-method来注入。
举例说明：先列出相关类：代码中的说明足够说明问题。user类：prototype bean
package com.cn.pojo;
import java.io.Serializable;
public class User implements Serializable{
/**
*
*/
private static final long serialVersionUID = 1L;
private int userId;
private String userName;
private String userPwd;
private String userInfo;
public int getUserId() {
return userId;
}
public void setUserId(int userId) {
this.userId = userId;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getUserPwd() {
return userPwd;
}
public void setUserPwd(String userPwd) {
this.userPwd = userPwd;
}
public String getUserInfo() {
return userInfo;
}
public void setUserInfo(String userInfo) {
this.userInfo = userInfo;
}
}
LookupMethod类：singleton bean
package com.cn.springTest;
import com.cn.pojo.User;
/**
* LookupMethod为singleton,user为propotype
* 当singleton Bean依赖propotype Bean，可以使用在配置Bean添加look-method来解决
* @author Administrator
*
*/
public class LookupMethod {
private User user;
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
}
核心配置文件：
<!-- user userbean --> <bean id ="user" class="com.cn.pojo.User" scope="prototype"> <property name="userId" value="1" /> <property name="userName" value="userName" /> <property name="userPwd" value="userPwd" /> <property name="userInfo" value="userInfo" /> </bean> <!-- lookupMethod LookupMethod为单例，user为原型的获取实例--> <bean id ="lookupMethod" class="com.cn.springTest.LookupMethod"> <!-- <property name="user" ref="user"/> --> <!-- 这种写法会将user当着单例来获取--> <lookup-method name="getUser" bean="user"/><!--lookup-method方式会将user当着原型来获取--> </bean>
测试类：SpringLookupMethod
import com.cn.util.SpringContextUtil;
public class SpringLookupMethod {
public static void main(String[] args) {
ApplicationContext actx = new ClassPathXmlApplicationContext("ApplicationContext.xml");
actx.getBean("springContextUtil");
LookupMethod lookupMethod = (LookupMethod) SpringContextUtil.getBean("lookupMethod");
System.out.println(lookupMethod);
LookupMethod lookupMethod1 = (LookupMethod) SpringContextUtil.getBean("lookupMethod");
System.out.println(lookupMethod1);
System.out.println(lookupMethod.getUser());
System.out.println(lookupMethod1.getUser());
System.out.println(lookupMethod.getUser());
System.out.println(lookupMethod1.getUser());
}
}
这样的测试足够说明问题。
当singleton Bean依赖propotype Bean，可以使用在配置Bean添加look-method来解决
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原文地址：http://www.cnblogs.com/xubiao/p/5852445.html
