struts的DispatchAction的应用

一 为什么需要分派action

 

 

二 快速入门

1、创建一个web工程

2、引入struts并配置 struts-config.xml

 

<? xml version = "1.0" encoding = "UTF-8" ?>

<! DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN" " http://struts.apache.org/dtds/struts-config_1_3.dtd" ; >

< struts-config >

  < form-beans >

    < form-bean name = "userForm" type = "com.yourcompany.struts.form.UserForm" />

  </ form-beans >

  < global-exceptions />

  < global-forwards />

  <!-- parameter用于区分用户的不同的请求 -->

  < action-mappings >

    < action

      attribute = "userForm"

      input = "/WEB-INF/login.jsp"

      name = "userForm"

      parameter = "flag"

      path = "/loginandLogout"

      scope = "request"

      type = "com.yourcompany.struts.action.LoginandLogoutAction"

      cancellable = "true" >

      < forward name = "loginok" path = "/WEB-INF/ok.jsp" />

      < forward name = "gologin" path = "/WEB-INF/login.jsp" />

    </ action >

  </ action-mappings >

 

  < message-resources parameter = "com.yourcompany.struts.ApplicationResources" />

</ struts-config >

3、JSP页面

3.1 login.jsp

<%@ page language = "java" import = "java.util.*" pageEncoding = "ISO-8859-1" %>

<%

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 'login.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 >

    < form action = "/dispatch/loginandLogout.do?flag=userlogin" method = "post" >

        u: < input type = "text" name = "username" >< br />

        p: < input type = "password" name = "password" >< br />

         < input type = "submit" value = "login" >

    </ form >

  </ body >

</ html >

3.2 ok.jsp

<%@ 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 'login.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 >

         < h1 > 登录成功 </ h1 >

         < a href = "/dispatch/loginandLogout.do?flag=userloginout" > 退出系统 </ a >

  </ body >

</ html >

4  LoginandLogoutAction

LoginandLogoutAction

/*

* Generated by MyEclipse Struts

* Template path: templates/java/JavaClass.vtl

*/

package com.yourcompany.struts.action;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionForward;

import org.apache.struts.action.ActionMapping;

import org.apache.struts.actions.DispatchAction;

import com.yourcompany.struts.form.UserForm;

/**

* MyEclipse Struts

* Creation date: 10-21-2017

*

* XDoclet definition:

* @struts.action validate="true"

*/

public class LoginandLogoutAction extends DispatchAction {

    /*

     * Generated Methods

     */

    /**

     * Method execute

     * @param mapping

     * @param form

     * @param request

     * @param response

     * @return ActionForward

     */

    //使用分派action往往需要自己重新命名函数，这个函数用于响应登录请求

    public ActionForward userlogin(ActionMapping mapping, ActionForm form,

            HttpServletRequest request, HttpServletResponse response) {

        // TODO Auto-generated method stub

        UserForm userForm=(UserForm) form;

        if("123".equals(userForm.getPassword())){

            return mapping.findForward("loginok");

        }

        else

        {

            return mapping.findForward("gologin");

        }

        

    }

    //这个函数用于响应注销请求

    public ActionForward userloginout(ActionMapping mapping, ActionForm form,

            HttpServletRequest request, HttpServletResponse response) {

        // TODO Auto-generated method stub

        //把用户的session清空

        request.getSession().invalidate();

        return mapping.findForward("gologin");

    }

}

 

5  UserForm

/*

* Generated by MyEclipse Struts

* Template path: templates/java/JavaClass.vtl

*/

package com.yourcompany.struts.form;

import org.apache.struts.action.ActionForm;

/**

* MyEclipse Struts

* Creation date: 10-21-2017

*

* XDoclet definition:

* @struts.form name="userForm"

*/

public class UserForm extends ActionForm {

    private String username;

    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;

    }

    private String password;

}