java+jquery處理xml數(shù)據(jù)的方法

function verify(){ 
    //1.獲取文本框中的內(nèi)容 
    //jquery查找節(jié)點(diǎn)的方式，參數(shù)加#加上id屬性可以找到一個(gè)節(jié)點(diǎn) 
    //jquery的方法返回的都是jquery的對(duì)象，可以繼續(xù)在上面執(zhí)行其他的jquery方法 
    var jqueryObj = $("#userName"); 
    //獲取節(jié)點(diǎn)的值 
    var userName = jqueryObj.val(); 
    //alert(userName); 
    //2.將文本框中的數(shù)據(jù)發(fā)送給服務(wù)遄的servlet 
    //使用jquery的XMLHTTPrequest對(duì)象get請(qǐng)求的封裝 
    //$.get("servlet/AjaxServlet?name="+userName,null,callback); 
    //使用jquery的xmlhttprequest對(duì)象get請(qǐng)求的封裝 
    //var obj = {name:"123",age:20}; 
    $.ajax({ 
        type: "POST", 
        url: "servlet/AjaxXmlServlet", 
        data: "name=" + userName,//發(fā)送給服務(wù)端的數(shù)據(jù) 
        dataType: "xml",//告訴jquety返回的數(shù)據(jù)格式 
        success: callback//定義交互完成，并且服務(wù)端在下返回?cái)?shù)據(jù)的回調(diào)函數(shù)
    }); 
} 
// 回調(diào)函數(shù) 
function callback(data){ 
    //3.接收服務(wù)器端返回的數(shù)據(jù) 
    //alert("服務(wù)器端的數(shù)據(jù)回來(lái)了！") 
    //需要將data這個(gè)對(duì)象中的數(shù)據(jù)解析出來(lái) 
    //首先需要將dom的對(duì)象轉(zhuǎn)換成jquery的對(duì)象 
    var jqueryObj = $(data); 
    //獲取message節(jié)點(diǎn) 
    var message = jqueryObj.children(); 
    //獲取文本內(nèi)容 
    var text = message.text(); 
    //4.將服務(wù)器返回的數(shù)據(jù)動(dòng)態(tài)的顯示在網(wǎng)頁(yè)上 
    //找到保存結(jié)果信息的節(jié)點(diǎn) 
    var resultObj = $("#result"); 
    //動(dòng)態(tài)的改變頁(yè)面中DIV節(jié)點(diǎn)的內(nèi)容 
    resultObj.html(text); 
    //alert(""); 
}

package com.panlong.servlet; 
import java.io.IOException; 
import java.io.PrintWriter; 
import javax.servlet.ServletException; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
public class AjaxXmlServlet extends HttpServlet { 
    private static final long serialVersionUID = 1L; 
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) 
            throws ServletException, IOException { 
            Integer total = (Integer) req.getSession().getAttribute("total"); 
            int temp = 0; 
            if(total == null ){ 
                temp = 1; 
            }else{ 
                temp = total.intValue() + 1; 
            } 
        req.getSession().setAttribute("total",total.intValue()+temp); 
        try { 
            //1.取參數(shù) 
            resp.setContentType("text/xml;charset=GB2312"); 
            PrintWriter out = resp.getWriter(); 
            StringBuilder builder = new StringBuilder(); 
            String old = req.getParameter("name"); 
            //2、檢查參數(shù)是否有問(wèn)題 
            String name = old; 
            builder.append("message>"); 
            if("".equals(old) || old == null){ 
                builder.append("用戶名必須輸入").append("/message>"); 
                 
            } 
            else     
                 { 
            if("lila".equals(name)){ 
                builder.append("該用戶名已經(jīng)注冊(cè)").append("/message>");
            }else{ 
                    builder.append("該用戶名未注冊(cè)，您可以注冊(cè)["+name+"]這個(gè)用戶名").append("/message>"); 
            } 
         } 
            out.println(builder.toString()); 
         
        }catch (Exception e) { 
            e.printStackTrace(); 
        //3.檢驗(yàn)操作 
        } 
    } 
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) 
            throws ServletException, IOException { 
        doGet(req, resp); 
    } 
}

!DOCTYPE html> 
html> 
  head> 
    title>AJAX實(shí)例/title>
    meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 
    meta http-equiv="description" content="this is my page"> 
    meta http-equiv="content-type" content="text/html; charset=GB2312">
    script type="text/javascript" src="js/AjaxJqueryXml.js">/script> 
    script type="text/javascript" src="js/jquery.js">/script> 
    !--link rel="stylesheet" type="text/css" href="./styles.css">--> 
  /head> 
  body> 
        font color="blue" size="2">請(qǐng)輸入用戶名：/font>  
         input type="text" id="userName" />font color="red" size="2">span id="result" >*/span>/font>br/>br/> 
         input type="submit" name="提交" value="提交"  onclick="verify()"/> 
  /body> 
/html>