【示例】Spring和Struts整合

此例子来自于《JavaEE企业应用实战》（李刚）

需要先导入spring和struts的jar包，一定要导入struts2-spring-plugin-版本号.jar，这是让spring和struts相关联的包。接下来是例子

struts.xml（在src文件下）

<?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>
    <constant name="struts.devMode" value="true"/>
    <constant name="struts.enable.DynamicMethodInvocation" value="false"/>
    <package name="default" namespace="/" extends="struts-default">
        <!-- 此处的class并不是一个类，而是一个bean的id -->
        <action name="login" class="loginAction">
            <result name="error">error.jsp</result>
            <result>success.jsp</result>
        </action>
        <action name="*">
            <result>{1}.jsp</result>
        </action>
    </package>
</struts>

web.xml（WEB-INF文件夹下）

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns="http://xmlns.jcp.org/xml/ns/javaee" 
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" 
    id="WebApp_ID" version="3.1">
  <display-name>TestStruts5</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
    <!-- ContextLoaderListener监听类实现了ServletContextListener接口，
         它可以在创建时自动查找WEB-INF文件夹下的applicationContext.xml文件
         如果要加载多个配置文件可以使用context-param对contextConfigLocation
         的参数进行配置
     -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener
        </listener-class>
    </listener>
    <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>

applicationContext.xml（在WEB-INF文件夹下）

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://www.springframework.org/schema/beans"
    xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-4.0.xsd">
    <bean id="myService" class="com.service.impl.MyServiceImpl"/>
    <bean id="loginAction" class="com.action.LoginAction" scope="prototype" p:myService-ref="myService"/>
</beans>

<font color="red">注意：</font>对Action配置一定要加scope属性，因为Action包含了请求的状态信息，必须为每个请求对应一个Action，所以不能将该Action实例配置成singleton行为

MyService接口

package com.service;

public interface MyService {
    int validLogin(String username , String pass);
}

MyService接口实现类

package com.service.impl;

import com.service.MyService;

public class MyServiceImpl implements MyService {

    @Override
    public int validLogin(String username, String pass) {
        // TODO Auto-generated method stub
        if(username.equals(pass)) {
            return 99;
        }
        return -1;
    }

}

Action类

package com.action;

import com.opensymphony.xwork2.ActionSupport;
import com.service.MyService;

public class LoginAction extends ActionSupport {
    private String username;
    private String password;
    private MyService myService;
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public void setMyService(MyService myService) {
        this.myService = myService;
    }
    @Override
    public String execute() throws Exception {
        // TODO Auto-generated method stub
        if(myService.validLogin(username, password) > 0) {
            return SUCCESS;
        }
        return ERROR;
    }
}

这里的myService只需要加set方法以便依赖注入。

---

接下来是测试用的页面
index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<s:form action="login">
    <s:textfield name="username" label="用户名"/>
    <s:textfield name="password" label="密码"/>
    <s:submit value="提交"/>
</s:form>
</body>
</html>

还需要一个success.jsp和error.jsp页面来代表action相应是成功还是失败的，我这里I就不写出来了。