Struts2表单与逻辑控制标签详解-优快云博客

本文链接：https://blog.youkuaiyun.com/minihoop/article/details/50810237

本文详细介绍了Struts2框架中的表单标签和逻辑控制标签使用方法。通过示例展示了如何使用表单标签创建输入字段，如文本框、密码框等，并演示了如何利用逻辑控制标签实现条件判断和循环等功能。

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OGNL(object-graph navigation label)

分类：表单标签，非表单标签，逻辑控制标签，数据访问标签

表单标签

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
   
  </head>
  
  <body>
    <s:form method="post" action="loginAction">
    <s:textfield label="username" name="user.username"/>
    <s:password label="password" name="user.password"/>
    <s:checkboxlist list="{'book','ball','tea'}" label="interest" name="interest"/> 
   <s:checkboxlist list="#{'1':'book','2':'ball','3':'tea'}" label="interest" name="interest1"/> 
    <s:radio list="{'book','ball','tea'}" label="interest" name="interest3"/> 
   <s:radio list="#{'1':'book','2':'ball','3':'tea'}" label="interest" name="interest4"/> 
   
   <s:select multiple="true" list="#{'1':'book','2':'ball','3':'tea'}" label="interest" name="interest6"/> 
   <s:textarea name="hello" label="content" rows="50" cols="20"/>
   <s:doubleselect doubleList="" list="" doubleName=""></s:doubleselect>
    <s:submit value="submit"/>
    </s:form>
  </body>
</html>

逻辑控制标签

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<%@ page import="bean.Em"  %>
<%
request.setCharacterEncoding("utf-8");
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
  </head>
  
  <body>
  <!--struts2 中有一个默认的valuestack 所有的属性首先默认保存在其中  -->
  <!--默认设置属性request和page范围内，可通过scope指定  -->
<%--   <s:set name="age" value=100/> --%>
     <s:set name="age" value="60" scope="session"/>
    <s:set name="booklist" value="{'hello','wang'}"/>;
    <s:select label="书籍" list="#booklist"/>
    <s:set name="bookmap" value="#{'1':'book','2':'sports','3':'music'} "/>
    <s:select label="selectmap" list="#bookmap" listkey="key" listValue="value"/>
  
  <!--获取属性，默认为request范围  -->
 <%--  <s:property value="age"/> --%>
 <s:property value="#session.age"/>
  <s:property value="#booklist"/>
  <s:property value="#booklist[0]"/>
  <s:property value="#bookmap.keys"/>
  <s:property value="#bookmap.values"/>
  
  <s:set name="score" value="50"/>
  <s:if test="#score>100">
  good
  </s:if>
  <s:elseif test="#score>60">
  	nice
  </s:elseif>
  <s:else>
  bad
  </s:else>
  <s:iterator value="#booklist" id="bookname">
  <s:property vlaue="bookname"/>
  </s:iterator>
  <s:iterator value="#bookmap">
  <s:property value="key"/>
  <s:property value="value"/>
  </s:iterator>
  
  <!-- 模拟从action中传递过来一个集合 集合中是对象 -->
  <%List<Em> list=new ArrayList<Em>();
  list.add(new Em(1,"hello"));
  list.add(new Em(2,"world"));
  list.add(new Em(3,"hehe"));
  request.setAttribute("list", list);
   %>
   <s:iterator value="#request.list" var="em"
   begin="1" end="2" step="2"
   >
   		<s:property value="#em.id"/>
   		<s:property value="#em.name"/>
   </s:iterator>
  
  <s:iterator value="#request.list" var="em"
   status="st">
   		<s:if test="#st.index%2==0">
   		good
   		</s:if>
   </s:iterator>
  </body>
</html>