Struts2的通用标签（数据标签和控制标签）

一、数据标签

index.jsp里：<a href="testAction1!test1?name=jack">测试Struts2的数据标签</a>

struts.xml里：

1 <?xml version="1.0" encoding="UTF-8" ?>
2 <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
3 <struts>
4     <package name="xsl" namespace="/" extends="struts-default">
5         <action name="testAction1" class="com.xsl.action.TestAction1">
6             <result name="test1">/tag1.jsp</result>
7         </action>
8     </package>
9 </struts>

TestAction1.java里：

 1 package com.xsl.action;
 2 
 3 import java.util.ArrayList;
 4 import java.util.List;
 5 
 6 import com.xsl.entity.Users;
 7 
 8 import javax.servlet.http.HttpServletRequest;
 9 
10 import org.apache.struts2.interceptor.ServletRequestAware;
11 
12 import com.opensymphony.xwork2.ActionSupport;
13 
14 public class TestAction1 extends ActionSupport implements ServletRequestAware {
15     private String name;
16     private HttpServletRequest request;
17     public String test1(){
18         String sname="tom";
19         request.setAttribute("sname", sname);
20         return "test1";
21     }
22     public String getName() {
23         return name;
24     }
25     public void setName(String name) {
26         this.name = name;
27     }
28     public void setServletRequest(HttpServletRequest request) {
29         this.request  = request;
30     }
31     
32 }

tag1.jsp里：

${name }---${sname } 
<s:property value="name"/> 
<s:property value="#request.sname"/>

最终页面上显示：

jack---tom
jack
tom

二、控制标签

index.jsp里：<a href="testAction1!test2">测试struts2的控制标签</a>

struts.xml里：

1 <?xml version="1.0" encoding="UTF-8" ?>
2 <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
3 <struts>
4     <package name="xsl" namespace="/" extends="struts-default">
5         <action name="testAction1" class="com.xsl.action.TestAction1">
6             <result name="test2">/tag2.jsp</result>
7         </action>
8     </package>
9 </struts>

TestAction1.java里：

 1 package com.xsl.action;
 2 
 3 import java.util.ArrayList;
 4 import java.util.List;
 5 
 6 import com.xsl.entity.Users;
 7 
 8 import javax.servlet.http.HttpServletRequest;
 9 
10 import org.apache.struts2.interceptor.ServletRequestAware;
11 
12 import com.opensymphony.xwork2.ActionSupport;
13 
14 public class TestAction1 extends ActionSupport implements ServletRequestAware {
15     private String name;
16     private HttpServletRequest request;
17     public String test2(){
18         List<Users> list = new ArrayList<Users>();
19         list.add(new Users(1,"tom1"));
20         list.add(new Users(2,"tom2"));
21         list.add(new Users(3,"tom3"));
22         list.add(new Users(4,"tom4"));
23         list.add(new Users(5,"tom5"));
24         list.add(new Users(6,"tom6"));
25         request.setAttribute("ulist",list );
26         return "test2";
27     }
28     public String getName() {
29         return name;
30     }
31     public void setName(String name) {
32         this.name = name;
33     }
34     public void setServletRequest(HttpServletRequest request) {
35         this.request  = request;
36     }
37     
38 }

tag2.jsp里：

 1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <%@ taglib uri="/struts-tags" prefix="s" %>
 3 
 4 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 5 <html>
 6   <head>
 7     <title>tag2.jsp</title>
 8   </head>
 9   
10   <body>
11     <s:iterator value="#request.ulist" var="user">
12         <!-- 显示list集合里的所有数据 -->
13         <!-- 
14         <s:property value="#user.id"/>---<s:property value="#user.uname"/><br>
15           -->
16          <!-- if条件语句 -->
17          <s:if test="#user.id<=2">
18              <s:property value="#user.id"/>---<s:property value="#user.uname"/><br>
19          </s:if>
20          <s:elseif test="#user.id>2&&#user.id<=4">
21              <s:property value="#user.id"/>+++<s:property value="#user.uname"/><br>
22          </s:elseif>
23          <s:else>
24              <s:property value="#user.id"/>***<s:property value="#user.uname"/><br>
25          </s:else>
26     </s:iterator>
27 
28     <s:iterator begin="1" end="10" step="1" status="varStatus">
29         <s:property value="#varStatus.index"/>---
30         <s:property value="#varStatus.count"/>---
31         <s:property value="#varStatus.odd"/>---
32         <s:property value="#varStatus.even"/>---
33         <s:property value="#varStatus.first"/>---
34         <s:property value="#varStatus.last"/>---
35         hello struts2<br>
36     </s:iterator>
37     <s:debug></s:debug>
38   </body>
39 </html>

最终页面上显示：

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原文地址：https://www.cnblogs.com/xsl1995/p/6649172.html