(四)XML基础（客户端和服务端发送与接收xml数据）

案例：

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="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%>">

<title>My JSP 'index.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">

<meta http-equiv="cache-control" content="no-cache">

<meta http-equiv="expires" content="0">

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

<meta http-equiv="description" content="This is my page">

<script type="text/javascript"

    src="<%=path%>/script/jquery-1.8.3.min.js"></script>

<script type="text/javascript">

        function sendXML(){

            var xmlStr = "<driverInfo>";

    xmlStr = xmlStr + "<driverClassName>com.sqlserver.driver.SQLServerDriver</driverClassName>";

    xmlStr = xmlStr + "<url>jdbc:sqlserver://127.0.0.1:xxx</url>";

    xmlStr = xmlStr + "<username>sa</username>";

    xmlStr = xmlStr + "<password>1</password>";

    xmlStr = xmlStr + "</driverInfo>";

        var data={

            "xmlStr":xmlStr

        };

        var sendURL="<%=path%>/servlet/xmlSevlet?date=" + new Date() + "";

        jQuery.post(sendURL, data, function(xmlData) {

            //从服务端接收到一个xml对象

            var userArray = xmlData.getElementsByTagName("userinfo");

            var optionHTML="";

            for (var i = 0; i < userArray.length; i++) {

                    var userElement=userArray[i];

                    var userid=userElement.getAttribute("userid");

                    var username=userElement.getElementsByTagName("username")[0].firstChild.nodeValue;

                    var age=userElement.getElementsByTagName("age")[0].firstChild.nodeValue;

                    optionHTML=optionHTML+"<option value="+userid+">"+username+"="+age+"</option>";

                    $("#userselect").html(optionHTML);   //改变id为userselect的标签的内容

            }

        }, "xml");

    }

</script>

</head>

<body>

    使用ajax来发送与接收XML的数据

    <input type="button" name="button1" id="button1" value="发送与接收XML"

        onclick="sendXML();" />

    <select id="userselect" style="width: 200px;"></select>

</body>

</html>

XmlServlet.java

package 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;

import org.dom4j.Document;

import org.dom4j.DocumentException;

import org.dom4j.DocumentHelper;

import org.dom4j.Element;

public class XmlSevlet extends HttpServlet {

    /**

     * The doGet method of the servlet. <br>

     *

     * This method is called when a form has its tag value method equals to get.

     *

     * @param request

     *            the request send by the client to the server

     * @param response

     *            the response send by the server to the client

     * @throws ServletException

     *             if an error occurred

     * @throws IOException

     *             if an error occurred

     */

    public void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        this.doPost(request, response);

    }

    /**

     * The doPost method of the servlet. <br>

     *

     * This method is called when a form has its tag value method equals to

     * post.

     *

     * @param request

     *            the request send by the client to the server

     * @param response

     *            the response send by the server to the client

     * @throws ServletException

     *             if an error occurred

     * @throws IOException

     *             if an error occurred

     */

    public void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        request.setCharacterEncoding("UTF-8");

        response.setContentType("text/html;charset=UTF-8");

        // 获取客户端传过来的xml字符串，并解析为xml对象

        String xml_str = request.getParameter("xmlStr");

        try {

            Document document = DocumentHelper.parseText(xml_str);

            Element rootElement = document.getRootElement();

            Element element1 = rootElement.element("driverClassName");

            Element element2 = rootElement.element("url");

            Element element3 = rootElement.element("username");

            Element element4 = rootElement.element("password");

            System.out.println(element1.getText());

            System.out.println(element2.getText());

            System.out.println(element3.getText());

            System.out.println(element4.getText());

        } catch (DocumentException e) {

            e.printStackTrace();

        }

        /**

         * 要返回一个XML的字符串。客户端的jQuery接收到之后，会自动将XML的字符串转为XML的文档对象。

         * 因为JQuery。post(,,,"xml") 会把返回的字符串对象转为xml对象

         */

        PrintWriter out = response.getWriter();

        StringBuffer str_xml = new StringBuffer();

        str_xml.append("<root>");

        for (int i = 0; i < 5; i++) {

            str_xml.append("<userinfo userid=\""+i+"\">");

            str_xml.append("<username>用户"+i+"</username>");

            str_xml.append("<age>12</age>");

            str_xml.append("</userinfo>");

        }

        str_xml.append("</root>");

        out.print(str_xml.toString());

        System.out.println(str_xml.toString());

        out.flush();

        out.close();

    }

}

结果：

本章所有代码都在：链接

巴特西

(四)XML基础（客户端和服务端发送与接收xml数据）

案例：

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