struts2的各种视图转发类型：redirect,redirectAction,plainText和字符编码类URLEncoder和URLDecoder的使用...

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redirect 浏览器重定向

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HelloWorld.java:

package blog.action;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

public class HelloWorld {
   private String msg;

   private String uname;

   public String getUname() {
       return uname;
   }

   public void setUname(String uname) {
       this.uname = uname;
   }

   public String getMessage() {
       return msg;
   }

   public String execute(){
           try {
               uname = URLEncoder.encode("张三","UTF-8");//ISO8859-1
           } catch (UnsupportedEncodingException e) {
               e.printStackTrace();
           }

       msg = "This is my first struts2 application!!!";
       return "success";
   }
}

struts.xml:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>
   <package name="blog" namespace="/control/employee" extends="struts-default">
       <action name="add" class="blog.action.HelloWorld" method="execute">
           <result name="success" type="redirect">/addEmployee.jsp?username=${uname}</result>
       </action>
   </package>

</struts>

addEmployee.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@page import="java.net.URLDecoder"%>
<%
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 'addEmployee.jsp' starting page</title>
</head>

<body>
${param.username }<br/>
<%=URLDecoder.decode( new String(request.getParameter("username").getBytes("ISO8859-1"),"UTF-8"),"UTF-8" )%>
   姓名： <input type="text" name="name">
   <BR/>

   uname:${uname }
</body>
</html>

效果图：

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redirectAction 重定向到另一个Actoin[分包内和包外]

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struts.xml:

        <action name="delDept">
           <result name="success" type="redirectAction">
               <param name="actionName">delete</param>
               <param name="namespace">/control/department</param>
           </result>
       </action>

        <action name="addRedirect">
           <result name="success" type="redirectAction">add</result>
       </action>
   </package>


   <package name="other" namespace="/control/department" extends="struts-default">
       <action name="delete">
           <result>/WEB-INF/page/delDept.jsp</result>

</action>
</package>
</struts>

对于包外的情况，<result/>节点下的<param/>两个参数的name的值可以在struts-corexxxx.jar包中找到struts-defaul.xml中找到actionRedirect的实现类org.apache.struts2.dispatcher.ServletActionRedirectResult

这个类中有两个方法setActionName和setNamespace，这就是那两个参数的来历。

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plainText 显示一个jsp页面的源码

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<action name="plainText">
           <result type="plainText">
               <param name="location">/addEmployee.jsp</param>
               <param name="charSet">UTF-8</param>

</result>

</action>

转载于:https://www.cnblogs.com/xzf007/archive/2012/07/21/2873888.html

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