Struts 2 - 重定向Action

redirect 結果型別呼叫標準的response.sendRedirect()方法，導致瀏覽器向給定位置發出新的請求。

我們可以將位置提供在<result...>元素的主體中，或者作為<param name = "location">元素。Redirect 也支援parse引數。這是一個使用 XML 配置的示例：

<action name = "hello" 
   class = "com.tutorialspoint.struts2.HelloWorldAction"
   method = "execute">
   <result name = "success" type = "redirect">
       <param name = "location">
         /NewWorld.jsp
      </param >
   </result>
</action>

所以只需修改您的WebContent/WEB-INF/classes/struts.xml檔案，如上所述定義重定向型別：

<?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>
   <constant name = "struts.devMode" value = "true" />
   <package name = "helloworld" extends = "struts-default">

      <action name = "hello" 
         class = "com.tutorialspoint.struts2.HelloWorldAction"
         method = "execute">
         <result name = "success" type = "redirect">
            <param name = "location">
             /NewWorld.jsp
            </param >
        </result>
      </action>

      <action name = "index"> 
         <result >/index.jsp</result>
      </action>

   </package>
</struts>

這裡NewWorld.jsp是一個新頁面，每當您的action返回“success”時，您將被重定向到該頁面。讓我們保持WebContent/WEB-INF/lib/web.xml不變，所以它的內容如下：

<?xml version = "1.0" Encoding = "UTF-8"?>
<web-app xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
   xmlns = "http://java.sun.com/xml/ns/javaee" 
   xmlns:web = "http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
   xsi:schemaLocation = "http://java.sun.com/xml/ns/javaee 
   http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
   id = "WebApp_ID" version = "3.0">

   <display-name>Struts 2</display-name>

   <welcome-file-list>
      <welcome-file>index.jsp</welcome-file>
   </welcome-file-list>
   
   <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>

</web-app>

建立action類檔案Java Resources/src/HelloWorldAction.java如下：

package com.tutorialspoint.struts2;

import com.opensymphony.xwork2.ActionSupport;

public class HelloWorldAction extends ActionSupport{
   private String name;

   public String execute() throws Exception {
      return "success";
   }
   
   public String getName() {
      return name;
   }

   public void setName(String name) {
      this.name = name;
   }
}

讓我們建立主頁面WebContent/WEB-INF/index.jsp，內容如下：

<%@ page language = "java" contentType = "text/html; charset = ISO-8859-1"
   pageEncoding = "ISO-8859-1"%>
<%@ taglib prefix = "s" uri = "/struts-tags"%>
   <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
   "http://www.w3.org/TR/html4/loose.dtd">

<html>
   <head>
      <title>Hello World</title>
   </head>
   <body>
      <h1>Hello World From Struts2</h1>
      <form action = "hello">
         <label for = "name">Please enter your name</label><br/>
         <input type = "text" name = "name"/>
         <input type = "submit" value = "Say Hello"/>
      </form>
   </body>
</html>

讓我們建立WebContent/WEB-INF/NewWorld.jsp，如果action返回“success”，請求將被重定向到此頁面：

<%@ page language = "java" contentType = "text/html; charset = ISO-8859-1"
   pageEncoding = "ISO-8859-1"%>
<%@ taglib prefix = "s" uri = "/struts-tags"%>
   <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
   "http://www.w3.org/TR/html4/loose.dtd">

<html>
   <head>
      <title>Redirected Page</title>
   </head>
   <body>
      <h1>New Page after redirection</h1>
   </body>
</html>

現在右鍵單擊專案名稱，然後單擊匯出 > WAR 檔案以建立 WAR 檔案。然後將此 WAR 部署到 Tomcat 的 webapps 目錄中。最後，啟動 Tomcat 伺服器並嘗試訪問 URL https://:8080/HelloWorldStruts2/index.action。這將為您提供以下螢幕：

在文字框中輸入任何值並提交頁面。重定向後，您應該會看到下一頁：

struts_result_types.htm

列印頁面