在Spring里面，當一個singleton bean依賴一個prototype bean，因為singleton bean是單例的，因此prototype bean在singleton bean里面也會變成單例.

這個怎么解決呢？？？可以使用Spring提供的lookup-method來注入。

舉例說明：先列出相關類：代碼中的說明足夠說明問題。user類：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類：singleton bean

package com.cn.springTest;import com.cn.pojo.User;/*** LookupMethod為singleton,user為propotype* 當singleton Bean依賴propotype Bean，可以使用在配置Bean添加look-method來解決* @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為單例，user為原型的獲取實例--><bean id ="lookupMethod" class="com.cn.springTest.LookupMethod"><!-- <property name="user" ref="user"/> --> <!-- 這種寫法會將user當著單例來獲取--><lookup-method name="getUser" bean="user"/><!--lookup-method方式會將user當著原型來獲取--></bean>

?

測試類：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());}}

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注：在測試的時候除了spring相關包，發現缺少cglib-jar包。

<dependency>
??? <groupId>cglib</groupId>
??? <artifactId>cglib</artifactId>
??? <version>3.1</version>
</dependency>

?

轉載于:https://www.cnblogs.com/xubiao/p/5852445.html

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