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 + "/";%>
     
     
     
     
         使用ajax来发送与接收XML的数据        

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. 
     *      * 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. 
     *      * 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("
     
      ");        for (int i = 0; i < 5; i++) {            str_xml.append("
      
       ");            str_xml.append("
       
        用户"+i+"
       ");            str_xml.append("
       
        12
       ");            str_xml.append("
      ");        }        str_xml.append("
     ");        out.print(str_xml.toString());        System.out.println(str_xml.toString());        out.flush();        out.close();    }}

结果：

 

 

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 本章所有代码都在：