Struts 2 - Include 包含标签

Struts include 标签与 jsp include 标签非常相似，很少使用。我们已经了解了如何使用 <s:action> 标签将 struts 操作的输出包含到 jsp 中。<s:include> 标签略有不同。它允许您将 jsp、servlet 或任何其他资源(struts 操作以外的内容)的输出包含到 jsp 中。在后台，它与 <jsp:include> 完全相似，但它允许您将参数传递给包含的文件，它也是 Struts 框架的一部分。

以下示例显示了我们如何将 HelloWorld.jsp 的输出包含到 employee.jsp 中。在这种情况下，HelloWorldAction.java 中的操作方法将不会被调用，因为我们直接包含 jsp。

创建操作类

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

让我们拥有包含以下内容的 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 employees.jsp 来制作以下内容 −

<%@ 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

您的 struts.xml 应如下所示 −

<?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>

文件 web.xml 应类似于 −

<?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 http://localhost:8080/HelloWorldStruts2/employee.action。这将产生以下屏幕 −

struts_data_tags.html