Struts框架与JSP操作技巧-优快云博客

1.抓取url中的id值
例如: http://localhost:8080/qas/delete_question.html?qid=4

< input type = " hidden " name = " qid " value = " ${param.qid} " />

2.选定默认radio

< s:iterator value = " satisfctions " >

< td >

< input name = " satify_id " type = " radio " < s: if test = " ${question.satisfaction.id==id} " > checked </ s: if > value = " <s:property value= " id " /> " >< s:property value = " name " /></ input >

</ td >

</ s:iterator >

3. 逻辑标签

< c: if test = " ${msg!='没有查到该用户'} " >

< tr >

< td colspan = " 2 " align = " center " >< input type = " submit " onclick = " return isRemit(); " value = " 确定 " /></ td >

</ tr >

注意要加单引号''，因为标签取出的东东都是字符串。

</ c: if >

                    <c:if test="${realAnswer== '1 '}" >是 </c:if >
                    <c:if test="${realAnswer== '2 '}" >不是 </c:if >
                    <c:if test="${realAnswer!= '1 ' && realAnswer!= '2 '}" >${realAnswer}

</c:if >

4.得到项目根目录。

$ {pageContext.request.contextPath}

< script language = " javascript " src = " ${pageContext.request.contextPath}/prototype.js " ></ script >

5.遍历

< c:forEach var = " coursePart " items = " ${courseParts} " >

< tr class = " tablehead " >

< td > $ {coursePart.id} </ td >

< td > $ {coursePart.name} </ td >

< td > $ {coursePart.course.name} </ td >

< td >

< a href = " increaseDown.html?coursePartId=${coursePart.id} " > 下载 </ a >

</ td >

< td >

< a href = " increaseHitsOnline.html?coursePartId=${coursePart.id} " > 查看 </ a >

</ td >

</ tr >

</ c:forEach >

6.判断为null

< c: if test = " ${question.answer!=null} " > $ {question.answer} </ c: if >

7.带序号遍历

< c:forEach var = " subject " items = " ${subjects} " varStatus = " i " >

< a href = " # " onclick = " link_clicked('${i.index}') " > $ {subject.name} </ a > |

</ c:forEach >

8.嵌套遍历

< c:forEach var = " subject " items = " ${subjects} " varStatus = " i " >

< div id = " sub_nav${i.index} " class = " head-sub-nav " style = " display: none; " >

< c:forEach var = " book " items = " ${subject.books} " varStatus = " j " >

< a href = " # " onclick = " link_clicked2(${i.index},${j.index}); " > $ {book.name} </ a > |

</ c:forEach >

</ div >

</ c:forEach >

9.forEach与set混合应用

< td >

< c: set var = " isRightNum " value = " 0 " />

< c:forEach var = " questionHistory " items = " ${examnationHistory.questionsHistorys} " >

< c: if test = " ${questionHistory.isRight == 0} " >

< c: set var = " isRightNum " value = " ${isRightNum +1} " />

</ c: if >

</ c:forEach >

$ {isRightNum } 个

</ td >

10．截取字符串

${fn:substring(cityDay.date,"0","10")}

11. 嵌套循环，例如遍历树形结构,

CateService cateService = (CateService)ctx.getBean("catesService"); List cates = cateService.getBaseCatesByCityId(Integer.parseInt(city)); List allcates = new ArrayList(); for(int i= 0;i<cates.size();i++){ TtCate cate = (TtCate)cates.get(i); Integer cid = cate.getId(); List subCates = cateService.getCatesByPid(cid); ObjectListBean olb = new ObjectListBean(); olb.setObj(cate); olb.setList(subCates); allcates.add(olb); } request.setAttribute("allcates", allcates);

其中

package com.secondhand.common; import java.io.Serializable; import java.util.List; public class ObjectListBean implements Serializable { private Object obj; private List list; public ObjectListBean() { } public List getList() { return list; } public void setList(List list) { this.list = list; } public Object getObj() { return obj; } public void setObj(Object obj) { this.obj = obj; } }

页面遍历

<tr> <c:set var="num" value="0"/> <c:forEach var="cc" items="${allcates}"> <c:set var="num" value="${num+1}"/> <td width="191" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td height="17" background="images/lm-bj_34.jpg"><a href="sort.php?city=beijing&sortid=8" mce_href="sort.php?city=beijing&sortid=8"><span class=" txt_14bt">${cc.obj.name }</span></a></td> <td width="1" rowspan="3" background="images/sxx_36.jpg"></td> </tr> <tr> <td height="10"></td> </tr> <tr> <td><table width="100%" border="0" cellspacing="0" cellpadding="0"> <c:forEach var="subcc" items="${cc.list}"> <tr> <td width="24" align="center"><img src="images/jj_42.jpg" mce_src="images/jj_42.jpg" width="8" height="5" /></td> <td height="25" class="txt_13"><a href="infolist_beijing_8_37" mce_href="infolist_beijing_8_37"> ${subcc.name }</a><span class="txt_hui">(3652264)</span></td> </tr> </c:forEach> </table></td> </tr> <tr> <td height="17"> </td> <td width="1"></td> </tr> </table></td> <c:if test="${num mod 4 == 0}"> </tr> <tr> </c:if> </c:forEach> </tr>