Jsp实现页面forEach循环遍历多条数据的显示和后台对应数据的获取(strurs1)实现
使用jstl标签和form动态的页面数据显示操作获取！
html代码：
<body>
<center>
<div id="header"></div>
<div id="divuser">
<input id="contextPath" type="hidden" value="${pageContext.request.contextPath}"/> <form id="userform">
<table id="usertb" width="655" border="0" cellpadding="2" cellspacing="0">
<caption>用户信息表</caption>
<c:if test="${empty userList}">
<tr>
<td><span>user data is null!</span></td>
</tr>
</c:if>
<c:forEach items="${userList}" var="user" varStatus="userStatus">
<tr>
<td width="40" align="center" class="tb_td_border">
<input id="uid${userStatus.index}" name="uid" type="radio" value="${userStatus.index}" />
</td>
<td width="100" align="center" class="tb_td_border">
<label for="uid${userStatus.index}"><span class="font12_blue">${user.userName }</span></label>
</td>
<td width="100" align="center" class="tb_td_border">
<label for="uid${userStatus.index}"><span class="font12_blue">${user.userGender}</span></label>
</td>
<td width="100" align="left" class="tb_td_border">
<label for="uid${userStatus.index}"><span class="font12_blue">${user.userEmail }</span></label>
</td>
<td width="100" align="center" class="tb_td_border">
<label for="uid${userStatus.index}"><span class="font12_blue">${user.userBirthDay }</span></label>
</td>
<td width="100" align="center" class="tb_td_border">
<label for="uid${userStatus.index}"><span class="font12_blue">${user.userAddress }</span></label>
</td>
<td width="110" align="center" class="tb_td_border">
<div id="divnickname${userStatus.index}">
<input id="nickname${userStatus.index }" name="nickname" type="text" class="font12_blue" maxlength="7" style="width: 100;" value="" onfocus="radiocheckbytextfocus(this);" />
</div></td>
</tr>
<input name="userId" type="hidden" value="${user.userId }" />
<input name="userName" type="hidden" value="${user.userName }" />
<input name="userGender" type="hidden" value="${user.userGender}" />
<input name="userEmail" type="hidden" value="${user.userEmail }" />
<input name="userBirthDay" type="hidden" value="${user.userBirthDay }" />
<input name="userAddress" type="hidden" value="${user.userAddress }" />
</c:forEach>
<tr>
<td colspan="7" align="right">
<input type="button" id="btsubmit" name="btsubmit" value="go>>..." />
</td>
</tr>
</table>
</form>
</div>
<div id="divbodyer"></div>
<hr size="2" noshade="noshade" width="665px" color="#4DFFFF"; />
<div id="div2user">
<table id="tbusernn" width="665" cellpadding="0" cellspacing="0" border="0">
<c:if test="${empty userLink}">
<tr>
<td>user data is null!</td>
</tr>
</c:if>
<c:forEach items="${userLink}" var="usernn" varStatus="usernnStatus">
<tr>
<td width="100" align="center">${usernn.key }</td>
<td align="center">${usernn.value.id } - ${usernn.value.name } - ${usernn.value.phone }</td>
</tr>
</c:forEach>
</table>
</div>
</center>
</body>
注解：<label for="uid${userStatus.index}"> for标签：for 属性规定 label 与哪个表单元素绑定（显示的联系），点击文本就会自动选中，当前for指向id的radio按钮。
jstl的c:forEach标签的属性：用于通用数据循环，它的属性：
items(属 性)：进行循环的项目 (描述)，否(是否必须)，无(缺省值)
var：代表当前项目的变量名，否，无
varStatus：显示循环状态的变量，否，无
begin：开始条件，否，0
end：结束条件，否，集合中的最后一个项目
step：步长，否，1
jstl中的varStatus和 var 属性一样， varStatus 用于创建限定了作用域的变量。不过，由 varStatus 属性命名的变量并不存储当前索引值或当前元素，而是赋予 javax.servlet.jsp.jstl.core.LoopTagStatus 类的实例。该类定义了一组特性，它们描述了迭代的当前状态，下面列出了这些特性:
<c:forEach var=”user" items=”${users}" varStatus=”status”>
<c:out value=”${status.current}”/> 当前对象
<c:out value=”${status.index}”/> 此次迭代的索引
<c:out value=”${status.count}”/> 已经迭代的数量
<c:out value=”${status.first}”/> 是否是第一个迭代对象
<c:out value=”${status.last}”/> 是否是最后一个迭代对象
</c:forEach>
<c:forEach>标签的items属性支持Java平台所提供的所有标准集合类型。此外，您可以使用该操作来迭代数组（包括基本类型数组）中的元素。它所支持的集合类型以及迭代的元素如下所示：
java.util.Collection：调用iterator()来获得的元素。
java.util.Map：通过java.util.Map.Entry所获得的实例。
java.util.Iterator：迭代器元素。
java.util.Enumeration：枚举元素。
Object实例数组：数组元素。
基本类型值数组：经过包装的数组元素。
用逗号定界的String：分割后的子字符串。
javax.servlet.jsp.jstl.sql.Result：SQL查询所获得的行。
并且使用“index”可以动态的使用js操作页面元素，和后台获取请求数据。
js代码：
$(document).ready(function(){
//submit html data
$("#btsubmit").click(function(){
var raduid = $("input[name=uid]:checked").val();
if(raduid == null || raduid == ""){
alert("请选择用户");
return;
}
var userForm = $("#userform").get(0);
var path = $("#contextPath").val(); userForm.action =path+"/usergetinfo.do?param=getHtmlUserInfo";
userForm.method = "post";
userForm.submit();
$("#btsubmit").prop("disabled",true);
});
});
//鼠标进入文本框，自动选中radio
function radiocheckbytextfocus(obj){
var nicknameId = $(obj).attr("id");
var radioId = nicknameId.substring(8);
var uidId = "#uid"+radioId;
$(uidId).prop("checked",true);
}
注解：$( elem ).attr( "checked" )
1.6版本前返回值为boolean,1.6+返回值为string，为属性的实际值，而不是boolean.
新的浏览器返回的是“checked”，老的浏览器返回的是true，所以不能使用attr ；.prop()方法被用来处理boolean attributes。
页面隐藏多条数据，值显示几条可以：
function bkchange(obj)
{
var img_path=obj.src;
if (img_path.lastIndexOf("images/jiantouup.jpg")>=0)
{
obj.src="images/jiantoudown.jpg";
$("tr[class='bkhide']").show();
}
else{
obj.src="images/jiantouup.jpg";
if($("input[name=uid]:checked").val()+1>3){
$("input[name=sid]").attr("checked",false);
}
$("tr[class='bkhide']").hide();
}
}
js操作表格迭代操作数据(迭代行下列获取单元格数据)：
$("#tbuser tr").each(function(){
//get user name
var userName = $(this).children("td").eq(1).text().trim();
});
js使用“$(obj).attr("id");”获取当前的id。或者$(this).attr("id");
js提交异步提交表单表单,数据为“$("#userForm").serialize()”，可以使用：
$.ajax({
url:"getNickName.do?uid="+index,
type:"post",
timeout:20000,
data:$("#userForm").serialize(),
success:function(data){
if(data==null){
data = "";
}
$(divuserhint).html("");
$(userId).attr("value",data);
clockradio("query");//callback "query"=method flag
},
error:function(){
$(userId).attr("value","");
$(divuserhint).html(user_info[3]);//js i18n
}
});
struts的配置文件(struts-config.xml)：
<form-beans>
<form-bean name="UserDataForm" type="com.ts.form.UserDataForm"></form-bean>
</form-beans>
<action path="/usergetinfo" name="UserDataForm" parameter="param" scope="request"
type="com.ts.actions.UserDataAccessAction">
<forward name="success" path="/tsjsp/userinfo.jsp"></forward>
</action>
Action处理：
package com.ts.actions; import java.io.UnsupportedEncodingException; import java.util.LinkedHashMap; import java.util.Vector; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.apache.log4j.Logger; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import org.apache.struts.actions.DispatchAction; import com.ts.services.vo.LinkUser; import com.ts.services.vo.UserSVo; import com.ts.testdatas.LinkedMapTestData; import com.ts.testdatas.UserTestData; /** * ClassName: LinkedMapDataAccessAction <br/> * Date: 2015-1-14 上午10:20:49 <br/> * <br/> * * @author [email protected] * * first made * @version 0.0.1<br/> * */ public class UserDataAccessAction extends DispatchAction { //log private static final Logger LOG = Logger.getLogger(UserDataAccessAction.class); /** * * getUserInfo:users information <br/> * @param mapping mapping * @param form form * @param request request * @param response response * @return forword mapping <br/> */ public ActionForward getDBUserInfo(ActionMapping mapping, ActionForm form, HttpServletRequest request,HttpServletResponse response){ //get request session HttpSession session = request.getSession(); Vector<UserSVo> userList = UserTestData.getUserTestData(); LOG.info("userList - :"+userList.size()); session.setAttribute("userList", userList); return mapping.findForward("success"); } /** * * getUserInfo:users information <br/> * @param mapping mapping * @param form form * @param request request * @param response response * @return forword mapping <br/> * @throws UnsupportedEncodingException if has error */ public ActionForward getHtmlUserInfo(ActionMapping mapping, ActionForm form, HttpServletRequest request,HttpServletResponse response){ //get request session HttpSession session = request.getSession(); //set request encoding try { request.setCharacterEncoding("GBK"); } catch (UnsupportedEncodingException e) { LOG.info("set request encoding failure!"); } StringBuffer sf = new StringBuffer(); //get html request data int uid = Integer.parseInt(request.getParameter("uid")); sf.append("uid:"+uid); String userId = request.getParameterValues("userId")[uid]; sf.append(" name:"+userId); String name = request.getParameterValues("userName")[uid]; sf.append(" name:"+name); String gender = request.getParameterValues("userGender")[uid]; sf.append(" gender:"+gender); String email = request.getParameterValues("userEmail")[uid]; sf.append(" email:"+email); String birthDay = request.getParameterValues("userBirthDay")[uid]; sf.append(" birthDay:"+birthDay); String address = request.getParameterValues("userAddress")[uid]; sf.append(" address:"+address); String nickName = request.getParameterValues("nickname")[uid]; sf.append(" nickname:"+nickName); LOG.info(sf.toString()); LinkedMapTestData linkdata = new LinkedMapTestData(); LinkedHashMap<String, LinkUser> userLink = linkdata.getLinkedHashMapData(userId, nickName); LOG.info("userLink- :"+userLink.size()); session.setAttribute("userLink", userLink); return mapping.findForward("success"); } }
可以通过"String name = request.getParameterValues("userName")[uid];"获取页面上的数据(radio=checked)。
此处数据用Vector和linkedHashMap存储：
public class UserTestData {
public static Vector<UserSVo> getUserTestData(){
Vector<UserSVo> userList = new Vector<UserSVo>();
UserSVo usertttian = new UserSVo("us1", "甜甜", "22", "女", "18707005525", "[email protected]", "1992-02-08", "北京朝阳", "研究生","xiaoA");
UserSVo userkke = new UserSVo("us2", "可可", "20", "女", "18707005526", "[email protected]", "1994-02-07", "北京昌平", "本科","xiaoB");
UserSVo userkka = new UserSVo("us3", "卡卡", "19", "女", "18707005527", "[email protected]", "1995-02-06", "天津西青", "高中","xiaoC");
UserSVo userddan = new UserSVo("us4", "淡淡", "18", "女", "18707005528", "[email protected]", "1996-02-05", "兰州城关", "高中","xiaoD");
UserSVo usernna = new UserSVo("us5", "娜娜", "17", "女", "18707005529", "[email protected]", "1997-02-04", "甘肃临夏", "初中","xiaoE");
userList.add(usertttian);
userList.add(userkke);
userList.add(userkka);
userList.add(userddan);
userList.add(usernna);
return userList;
}
}
public class LinkedMapTestData {
LinkedHashMap<String, LinkUser> linkedHashMap = new LinkedHashMap<String, LinkUser>();
public LinkedHashMap<String, LinkUser> getLinkedHashMapData(String userId,String nickName) {
Vector<UserSVo> vector = UserTestData.getUserTestData();
UserSVo user = null;
for(int i=0,j=vector.size();i<j;i++){
user = vector.get(i);
LinkUser userlink = user.getUser();
userlink.setId(user.getUserId());
userlink.setName(user.getUserName());
userlink.setPhone(user.getUserPhone());
if(user.getUserId().equals(userId)){
user.setUserNickName(nickName);
}
linkedHashMap.put(user.getUserNickName(),userlink);
}
return linkedHashMap;
}
}
此处的LinkedHashMap中key和value中放了对象，在页面可以通过“${usernn.value.id }”或“${usernn.key.id }”获取其中的值显示。