> Struts2中文手册 > 查看详细示例

创建Action类

package cn.w3cschool.struts2;

public class HelloWorldAction{
   private String name;

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

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

创建视图

接着创建如下index.jsp文件:

<%@ 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 pick a name</label><br/>
      <select name="name">
         <option name="Mike">Mike</option>
         <option name="Jason">Jason</option>
         <option name="Mark">Mark</option>
      </select>
      <input type="submit" value="Say Hello"/>
   </form>
</body>
</html>
然后让我们用HelloWorld.jsp来演示如何使用ifelseelseif标签:

<%@ page contentType="text/html; charset=UTF-8" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title>Example of If and Else</title>
</head>
<body>
<b>Example of If and Else</b><br/>
<s:if test="name=='Mike'">
   You have selected 'Mike'. 
</s:if>
<s:elseif test="name=='Jason'">
   You have selected 'Jason'
</s:elseif>
<s:else>
   You have not selected 'Mike' or 'Jason'.
</s:else>
</body>
</html>
这里,如果在“test”属性中指定的条件返回true,if标签返回true。在我们的例子中,我们将其与“Mike”进行比较。如果名称是Mike,标签返回true,则印出字符串;否则“elseif”块被执行,如果不满足,则else块被执行。这与在Java语言中传统的if,else if和else没有区别。

配置文件

你的struts.xml文件应如下:

<?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="cn.w3cschool.struts2.HelloWorldAction" 
            method="execute">
            <result name="success">/HelloWorld.jsp</result>
      </action>

   </package>
</struts>
你的web.xml文件应如下:

<?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>
现在,右键单击项目名称,然后单击“Export”> “WAR File”以创建WAR文件。然后在Tomcat的webapps目录中部署WAR文件。最后,启动Tomcat服务器并尝试访问URL http://localhost:8080/HelloWorldStruts2/index.jsp,将显示以下界面:

查看详细示例
现在选择“Mark”并提交页面,你会看到以下页面:

查看详细示例

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