struts2标签的使用（一）

最新推荐文章于 2025-05-01 23:03:21 发布

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最新推荐文章于 2025-05-01 23:03:21 发布

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文章标签： struts integer iterator null html list

本文链接：https://blog.youkuaiyun.com/zhuxia3473/article/details/4538730

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网上铺天盖地的有很多的例子，手册之类，这里引用一个我初学时做的一个例子

TestAction中：

public class TestAction extends ActionSupport {

public String test1() {
  Product product = new Product();
  product.setProdId(new Long(112233));
  ProdSpec prodSpec = new ProdSpec();
  prodSpec.setProdSpecId(new Integer("379"));
  prodSpec.setName("CDMA");
  product.setProdSpec(prodSpec);
  HttpServletRequest request = ServletActionContext.getRequest();
  request.setAttribute("myName", "zhuxia");

//增加一个地址
 List<Prod2Addr> list = new ArrayList<Prod2Addr>();
 Prod2Addr addr1 = new Prod2Addr();
 addr1.setProdId(new Long(111));
 addr1.setAddressId(new Long(1233));
 addr1.setReasonCd(new Integer(3));
 Prod2LocationReason p1 = new Prod2LocationReason();
 p1.setReasonCd(new Integer(3));
 p1.setName("install address");
 addr1.setProd2LocationReason(p1);
 addr1.setAddressDesc("Nan Jing Road");
 list.add(addr1);
 Prod2Addr addr2 = new Prod2Addr();
 addr2.setProdId(new Long(111));
 addr2.setAddressId(new Long(1233));
 addr2.setReasonCd(new Integer(3));
 addr2.setAddressDesc("Shang Hai Road");
 addr2.setProd2LocationReason(p1);
 list.add(addr2);
 product.setProd2Addrs(list);
 request.setAttribute("product", product);
 return "test1";
}
}

test1 对应test1.jsp页面，内容如下：

<%@ page language="java" contentType="text/html; charset=GB18030"
 pageEncoding="GB18030"%>
<%@ 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>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>Insert title here</title>
</head>
<body>
<s:set name="name" value="#request.myName"/>
1: request.myName value1112233444 
<s:property value="#request.myName"/> 
the name is : <s:property value="#name"/> 
 

 2: test if 
 <s:set name="prodSpecName" value="#request.product.prodSpec.name"/>
 the prodSPecName is: <s:property value="#prodSpecName"/>
 
 test another example
 <s:set name="prodSpec" value="#request.product.prodSpec"/>
 <s:if test="#prodSpec != null">
 prodSpecId is:<s:property value="#prodSpec.prodSpecId"/> 
 prodSpecName is: <s:property value="#prodSpec.name"/>
 </s:if>

 test another example: the context can not be seen 
 <s:set name="area" value="#request.product.area"/>
 <s:if test="#area != null">
 areaId: <s:property value="#area.areaId"/> 
 areaName:<s:property value="#area.name"/> 
 </s:if>
 <s:else>
 the product.area is null
 </s:else>
 
 
 3:iterator 
 <s:set name="prod2Addrs" value="#request.product.prod2Addrs"/>
 <s:iterator value="#prod2Addrs" status="prod2Addr">
 
 
 addressDesc : <s:property value="addressDesc"/> 
 prod2Addr.reasonName11 : <s:property value="prod2LocationReason.name"/> 
 location : <s:set name="prod2LocationReason" value="prod2LocationReason"/> 
 reasonName : <s:property value="#prod2LocationReason.name"/> 
 prod2Addr.reasonName22 : <s:property value="prod2LocationReason.name"/> 
 </s:iterator>
</body>
</html

运行结果：

1: request.myName value1112233444
zhuxia
the name is : zhuxia

2: test if
the prodSPecName is: CDMA
test another example prodSpecId is:379
prodSpecName is: CDMA test another example: the context can not be seen
the product.area is null

3:iterator
addressDesc : Nan Jing Road
prod2Addr.reasonName11 : install address
location :
reasonName : install address
prod2Addr.reasonName22 : install address
addressDesc : Shang Hai Road
prod2Addr.reasonName11 : install address
location :
reasonName : install address
prod2Addr.reasonName22 : install address