----

Struts框架中通过Action的结果映射配置返回视图，Action对象是Struts2框架中的请求处理对象那，针对不同的业务请求及处理结果，Action将返回一个字符串，这个字符串就是Action处理结果的逻辑名，Struts2框架将更加逻辑视图名称，到配置文件struts.xml中查找逻辑视图名称匹配的视图，找到之后将这个视图回应给浏览器。

----

要求：编写Action对象，处理对表单提交的数据，模拟实现对指定用户的问候。

----

1、创建web项目，jwrm04-helloToSB，把包添加到lib，web.xml中注册过滤器。（详见web08）。

----

2、创建类GreetingAction的Action对象。

package dog;

import com.opensymphony.xwork2.ActionSupport;

public class GreetingAction extends ActionSupport{
    private static final long serialVersionUID=1L;
    
    //用户名
    private String username;
    //处理请求
    @Override
    public String execute() throws Exception{
        //判断用户名是否有效
        if(username==null||"".equals(username)){
            //返回到错误页面
            return ERROR;
        }else{
            //返回到成功界面
            return SUCCESS;
        }
    }
    
    //username的getter方法
    public String getUsername(){
        return username;
    }
    //username的setter方法
    public void setUsername(String username){
        this.username=username;
    }
}

GreetingAction类用于对表单提交的username进行处理。

----

3、配置struts.xml

<?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>
    <!-- 声明包 -->
    <package name="myPackage" extends="struts-default">
        <!-- 定义action -->
        <action name="greeting" class="dog.GreetingAction">
            <!-- 定义成功的映射页面 -->
            <result name="success">success.jsp</result>
            <!-- 定义失败的映射页面 -->
            <result name="error">error.jsp</result>
        </action>
    </package> 
</struts>

就是说，当web应用访问目录下“greeting”时，将有GreetingAction类对请求作出处理。

----
4、index.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 '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="greeting.action" method="post">
          请输入您的姓名：<input type="text" name="username">
          <input type="submit" value="提交">
      </form>
  </body>
</html>

----

5、创建success.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ taglib prefix="s" uri="/struts-tags" %>  
<!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>
    <font color="red">
        <s:property value="username"/>
    </font>
    ,您好！欢迎来到本站。
  </body>
</html>

类似，创建error.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'error.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>
    <font color="red">
    错误，您没有输入用户名！
    </font>
  </body>
</html>

----

6、部署，访问：http://localhost:8080/jwrm04-helloToSB/index.jsp

点击“提交”

输入框为空时点击“提交”

----

完毕

posted @ 2016-07-28 20:29 摘丶星阅读(376) 评论(0) 编辑收藏举报

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