SSH框架（四） struts2+spring3.0的登陆示例

（一）关键理念及需要注意的地方：

　　使用struts2+spring3.0的框架搭建web程序，就是使用spring来进行依赖注入（依赖注入请参考baidu上面的解释：http://baike.baidu.com/link?url=uESWlODOsyqaaqlGLxps8xh2UaadfEe2rdsjspvZN5qsw1BOitPx_QQYuPV904jCwb493WK1ROrO3iIPZrbAQa）。

　　需要注意的地方如下：

1. struts.xml中的action的class要写spring中的bean，这个意思就是让spring去实例化改对象。比如：<action name="Login" class="loginAction" method="execute">
2. 在action的bean中在引入相关的类
       <bean id="loginAction" class="com.HYOpticalComm.action.LoginAction"> 
     <property name="loginService" ref="loginServiceImp"></property>  ---这里边调用的是LoginAction类的setter函数。并使用loginServiceImp类来实例化
       </bean>
3. 要包含“Struts 2 Spring”这个包，这个包就是struts和spring关联的包。

（二）目录结构和需要的包：

　　

（三）各个文件相互之间的关系：

（四）代码：

<?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">

    <!-- 配置FilterDispatcher过滤器,以便加Spring容器 -->
    <filter>
    <filter-name>struts2</filter-name>
    <filter-class>
        org.apache.struts2.dispatcher.FilterDispatcher
    </filter-class>
    </filter>

    <filter-mapping>
    <filter-name>struts2</filter-name>
    <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!-- 指明spring配置文件在何处 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/classes/spring*.xml</param-value>
    </context-param>        

  <!-- 开启监听, 加载spring配置文件applicationContext.xml -->
  <listener>
    <listener-class>
    org.springframework.web.context.ContextLoaderListener
    </listener-class>
  </listener>
  <session-config>
    <session-timeout>1</session-timeout>
  </session-config>    

    <!-- web欢迎界面 -->
    <welcome-file-list>
    <welcome-file>login.jsp</welcome-file>
    </welcome-file-list>

</web-app>

web.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
    <!-- 需要Spring时添加 -->
    <!-- <constant name="struts.objectFactory" value="spring" />  -->

    <package name="default" extends="struts-default">
        <action name="Login" class="loginAction" method="execute">
            <result name="success">index.jsp</result>
            <result name="input">login.jsp</result>
        </action>
    </package>

</struts>

struts.xml

<?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:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

    <!--
    <bean id="dataSource"
        class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName"
            value="com.microsoft.sqlserver.jdbc.SQLServerDriver">
        </property>
        <property name="url"
            value="jdbc:sqlserver://127.0.0.1:1433;databaseName=springTest">
        </property>
        <property name="username" value="sa"></property>
        <property name="password" value="111111"></property>
    </bean>
    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="dataSource">
            <ref bean="dataSource" />
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">
                    org.hibernate.dialect.SQLServerDialect
                </prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.format_sql">true</prop>
            </props>
        </property>
        <property name="mappingResources">
            <list>
                <value>com/HYOpticalComm/model/Login.hbm.xml</value>
            </list>
        </property>
    </bean>
     -->
     <!--
    <import resource="config/spring/spring-basic.xml" />
    <import resource="config/spring/spring-dao.xml" />
    -->
    <import resource="config/spring/spring-service.xml" />
    <import resource="config/spring/spring-action.xml" />
</beans>

spring.xml

<?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:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

    <bean id="loginAction" class="com.HYOpticalComm.action.LoginAction">
        <property name="loginService" ref="loginServiceImp"></property>
    </bean>
</beans>

spring-action.xml

<?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:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

    <bean id="loginServiceImp" class="com.HYOpticalComm.serviceImp.LoginServiceImp" />
</beans>

spring-service.xml

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  </head>

  <body>

        <s:form action="Login" method="post">
            <s:textfield key="username" label="用户名" />
            <s:password key="password" label="密码" />
            <s:submit value="登陆" />
        </s:form>

  </body>
</html>

login.jsp

<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  </head>

  <body>
      <div>
          <h4>欢迎你!</h4><font color="red">${username}</font>
          <br/>
          <h4>你登录的密码是<h4><font color="red">${password}</font>;
      </div>
  </body>
</html>

index.jsp

package com.HYOpticalComm.action;

import com.HYOpticalComm.service.ILoginService;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport
{

    /**
     *
     */
    private static final long serialVersionUID = 1L;

    private String username;
    private String password;

    /*
     * 我们通过Spring的IOC容器注入LoginService，从而减少类之间的依赖关系
     */
    private ILoginService loginService;

    public ILoginService getLoginService()
    {
        return loginService;
    }
    public void setLoginService(ILoginService loginService)
    {
        this.loginService = loginService;
    }
    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;
    }

    @Override
    public void validate()
    {
        /*
         * 我们可以在这个方法类加一些输入验证 但是为了体现后面我们写的业务逻辑方法这就不验证
         */
    }

    @Override
    public String execute() throws Exception
    {

        boolean result = loginService.validate(username, password);
        if(result == true)
        {
            return SUCCESS;
        }
        else
        {
            return INPUT;
        }
    }
}

LoginAction.java

package com.HYOpticalComm.service;

/*接口类    */
public interface ILoginService
{
    public boolean validate(String username,String password)throws Exception;
}

ILoginService.java

package com.HYOpticalComm.serviceImp;

import com.HYOpticalComm.service.ILoginService;

public class LoginServiceImp implements ILoginService
{
    /*
     * 我们这只是一个小的例子，不与数据库打交到
     * 若有数据库操作，那么在这个LoginService就是操作具体Dao类实现登录的相关操作
     */
    public boolean validate(String username,String password)throws Exception
    {
        boolean v = false;
        if(!"admin".equals(username))//如果用户名不等于xcp，就抛出一个异常
        {
            //throw new UsernameException("用户名不正确");
        }
        else if(!"123".equals(password))//如果密码不等于123，就抛出一个异常

        {
            //throw new PasswordException("密码不正确");
        }
        else
        {
            v = true;
        }
        return v;
    }
}

LoginServiceImp.java