Struts 2 - 重定向操作
redirect 结果类型调用标准 response.sendRedirect() 方法，导致浏览器创建指向给定位置的新请求。
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。以下是使用 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>
此处 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。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，内容如下 −
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;
}
}
让我们创建主页WebContent/WEB-INF/index.jsp并包含以下内容 −
<%@ 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 Export > WAR File 以创建 War 文件。然后将此 WAR 部署到 Tomcat 的 webapps 目录中。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 −
在文本框中输入任意值并提交页面。重定向后您应该会看到下一页 −
struts_result_types.html
