Struts07---访问servlet的API

01.创建登录界面

<%@ 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 '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>

  <form action="user/login" method="post">

       <table>

            <tr>

               <td>用户名：</td>

               <td><input  type="text" name="name"/></td>

            </tr>

            <tr>

               <td>密码：</td>

               <td><input  type="password" name="password"/></td>

            </tr>

            <tr>

               <td></td>

               <td><input  type="submit" value="登录"/></td>

            </tr>

       </table>

   </form>

  </body>

</html>

02.配置struts.xml文件

<?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"/>

    <package name="default"  namespace="/user" extends="struts-default">

       <action name="login" class="cn.bdqn.action.UserAction" method="login">

           <result>/success.jsp</result>

      </action>

    </package>

</struts>

03.创建对应的UserAction

package cn.bdqn.action;

import java.util.Map;

import javax.servlet.ServletContext;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionContext;

import com.opensymphony.xwork2.ActionSupport;

/**

 *  用户登录的action

 *  jsp九大内置对象

 *

 *  out

 *  page

 *  pageContext

 *  request

 *  response

 *  session

 *  application

 *  config

 *  exception

 */

public class UserAction extends ActionSupport{

/**

    public  String  login(){

          获取前台的值

          01.耦合方式  不推荐使用

        String name = ServletActionContext.getRequest().getParameter("name");

        String password = ServletActionContext.getRequest().getParameter("password");

        System.out.println(name);

        System.out.println(password);

        //放入作用域

        ServletActionContext.getRequest().setAttribute("name",name);

        ServletActionContext.getRequest().setAttribute("password",password);

        return  SUCCESS;

    }*/

    /**

     * 登录的方法

     02. 解耦两种方法

            001. 使用ActionContext!

       sturts2在底层把我们的request,session,application用Map集合保存起来了！

     */

    private  String  name;

    private  String  password;

    public  String  login(){

    Map<String, Object> request=(Map<String, Object>) ActionContext.getContext().get("request");

    //让success.jsp获取数据

    request.put("name",name);//  等同于setAttribute("name",name);

    request.put("password",password);

        return  SUCCESS;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public String getPassword() {

        return password;

    }

    public void setPassword(String password) {

        this.password = password;

    }

}

04.使用第二种解耦的方式，就是实现对应的Aware接口

import org.apache.struts2.interceptor.RequestAware;

import com.opensymphony.xwork2.ActionSupport;

/**

 *  实现对应的Aware接口

 */

public class UserAction2 extends ActionSupport implements RequestAware{

    private  String  name;

    private  String  password;

    private Map<String, Object> request;  //并不用写 set和get

    //登录的方法

    public  String  login(){

    request.put("name",name);

    request.put("password",password);

        return  SUCCESS;

    }

    //重写方法   给请求request赋值

    @Override

    public void setRequest(Map<String, Object> request) {

        this.request=request;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public String getPassword() {

        return password;

    }

    public void setPassword(String password) {

        this.password = password;

    }

}

05.success.jsp

  ===============el表达式获取数据=============<br/>

  ${name}

  ${password} <br/>

   ===============struts2标签获取数据=============<br/>

   <s:property value="password"/> <%--值栈中获取的    --%>

   <s:property value="#request.password"/>  <%--栈的上下文中获取的    --%>

   <s:property value="#attr.password"/>

巴特西

Struts07---访问servlet的API

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