Struts2重定向动作

2022-02-10 08:16:07
665次星辉

重定向结果类型调用标准的response.sendRedirect()方法，导致浏览器创建到给定位置的新请求。

我们可以在<result...>元素的主体中或作为<param name = "location">元素提供位置。重定向还支持parse参数。这是一个使用 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>

因此，只需修改您的WebContent/WEB-INF/classes/struts.xml文件以定义上述重定向类型

<?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>

这里NewWorld.jsp是一个新页面，只要您的操作返回“成功”，您就会被重定向到该页面。让我们保持WebContent/WEB-INF/lib/web.xml不变，因此其内容如下

<?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>

创建动作类文件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;
   }
}

让我们使用以下内容创建主页WebContent/WEB-INF/index.jsp

<%@ 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>

让我们创建WebContent/WEB-INF/NewWorld.jsp，如果操作返回“成功”，请求将被重定向

<%@ 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>

现在右键单击项目名称，然后单击导出 > WAR 文件以创建一个 War 文件。然后在 Tomcat 的 webapps 目录中部署这个 WAR。最后，启动 Tomcat 服务器并尝试访问 URL http://localhost:8080/HelloWorldStruts2/index.action。这将为您提供以下屏幕