Java进阶知识20 Struts2和Spring整合在一起

1、概述       

  1、Spring负责对象创建
  2、Struts2负责用Action处理请求
  3、整合的关键点：让Struts2框架Action对象的创建交给Spring完成。

2、整合实例  

需要用到的 jar包

　　　　   Spring的配置文件（aaa-bbb.xml）建议分层，方便维护。

配置web.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <display-name></display-name>    
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  
    <!-- Spring 监听器 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/classes/beans-*.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- Struts 过滤器 -->
    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

DAO层

//接口
public interface IUserDao {
    public String getByName();
}

//实现
public class UserDaoImpl implements IUserDao {

    public String getByName() {
        return "DSHORE";
    }
}

Service层

//接口
public interface IUserService {
    public String getByName();
}

//实现
public class UserServiceImpl implements IUserService {

    //注入值，如果没有使用spring框架，则此处需要new对象，否则拿不到值。
    private IUserDao userDao;// = new UserDaoImpl();
    
    public String getByName() {
        return userDao.getByName();
    }

    public IUserDao getUserDao() {
        return userDao;
    }
    public void setUserDao(IUserDao userDao) {
        this.userDao = userDao;
    }
}

Action层

package com.shore.action;

import com.opensymphony.xwork2.ActionSupport;
import com.shore.service.IUserService;

/**
 * @author DSHORE/2019-10-26
 * 
 */
public class UserAction extends ActionSupport {
    private static final long serialVersionUID = -8197510116737054459L;

    //注入值，如果没有使用spring框架，则此处需要new对象，否则拿不到值。
    private IUserService userService;// = new UserServiceImpl();

    public String login() {
        System.out.println("用户名：" + userService.getByName());
        return SUCCESS;
    }

    public IUserService getUserService() {
        return userService;
    }

    public void setUserService(IUserService userService) {
        this.userService = userService;
    }
}

struts.xml 配置文件      注意：struts.xml 中 action name 和 bean-action.xml 中的 bean id 名称，一定要保持一致！！！

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    "http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>
    <!-- true支持动态方法调用 -->
    <constant name="struts.enable.DynamicMethodInvocation" value="true" />
    <constant name="struts.devMode" value="true" /> <!-- true -->

    <package name="front" namespace="/front" extends="struts-default">
        <action name="userAction" class="com.shore.action.UserAction">
            <result name="success">/success.jsp</result>
        </action>
    </package>
</struts>

beans-dao.xml 配置文件    

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"  
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/tx
       http://www.springframework.org/schema/tx/spring-tx.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop.xsd">
       
       <bean id="userDao" class="com.shore.dao.impl.UserDaoImpl"></bean>
</beans>

beans-service.xml 配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"  
       xmlns:p="http://www.springframework.org/schema/p" 
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/tx
       http://www.springframework.org/schema/tx/spring-tx.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop.xsd">
       
       <bean id="userService" class="com.shore.service.impl.UserServiceImpl" p:userDao-ref="userDao"></bean>
</beans>

beans-action.xml 配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"  
       xmlns:p="http://www.springframework.org/schema/p" 
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/tx
       http://www.springframework.org/schema/tx/spring-tx.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop.xsd">
       
       <!-- scope="prototype"：多例。默认是单例（不用写即是默认） -->
       <bean id="userAction" class="com.shore.action.UserAction" scope="prototype" p:userService-ref="userService"></bean>
</beans>

index.jsp 页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib uri="/struts-tags" prefix="s"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
  </head>
  
  <body>
    <s:form action="userAction!login" method="post" namespace="/front">
        <s:textfield name="name" label="用户名"></s:textfield>
        <s:password name="password" label="密码"></s:password>
        <s:submit value="登录"></s:submit>
    </s:form>
  </body>
</html>

success.jsp 页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'success.jsp' starting page</title>
    
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

  </head>
  
  <body>
       登录成功！
  </body>
</html>

测试结果图：

原创作者：DSHORE

作者主页：http://www.cnblogs.com/dshore123/

原文出自：https://www.cnblogs.com/dshore123/p/11745460.html

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