Struts 2 - include 标签

Struts include 标签与jsp 的include标签非常相似，并且很少使用。我们已经了解了如何使用<s:action>标签将Struts action的输出包含到jsp中。<s:include>标签略有不同。它允许你将jsp、servlet或任何其他资源（非Struts action）的输出包含到jsp中。在幕后，它与<jsp:include>完全相同，但它允许你向包含的文件传递参数，并且它也是Struts框架的一部分。

以下示例演示如何将HelloWorld.jsp的输出包含到employee.jsp中。在这种情况下，HelloWorldAction.java中的action方法不会被调用，因为我们直接包含了jsp。

创建Action类

package com.tutorialspoint.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

让我们使用以下内容创建HelloWorld.jsp：

<%@ page contentType = "text/html; charset = UTF-8" %>
<%@ taglib prefix = "s" uri = "/struts-tags" %>

<html>
   <head>
      <title>Hello World</title>
   </head>
   
   <body>
      <h2>Example of Generator Tag</h2>
      <h3>The colours of rainbow:</h3>

      <s:generator val = "%{'Violet,Indigo,Blue,
         Green,Yellow,Orange,Red '}" count = "7" separator = ",">
         
         <s:iterator>
            <s:property /><br/>
         </s:iterator>
      </s:generator>	
         
   </body>
</html>

接下来，让我们使用以下内容创建employees.jsp：

<%@ page contentType = "text/html; charset = UTF-8"%>
<%@ taglib prefix = "s" uri = "/struts-tags"%>

<html>
   <head>
      <title>Employees</title>
   </head>
   
   <body>
      <p>An example of the include tag: </p>
      <s:include value = "HelloWorld.jsp"/>
   </body>
</html>

配置文件

你的struts.xml应该如下所示：

<?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">/HelloWorld.jsp</result>
      </action>
      
      <action name = "employee" 
         class = "com.tutorialspoint.struts2.Employee" 
         method = "execute">
         <result name = "success">/employee.jsp</result>
      </action>

   </package>
</struts>

你的web.xml应该如下所示：

<?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>

右键单击项目名称，然后单击导出 > WAR文件以创建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 https://127.0.0.1:8080/HelloWorldStruts2/employee.action。这将生成以下屏幕：

struts_data_tags.htm

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