Jquery+ajax+JAVA(servlet)实现下拉菜单异步取值_jquery

项目所需要的包，如下所示：

JSP代码：

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
<%
 String path = request.getContextPath();
 String basePath = request.getScheme() + "://"
 + request.getServerName() + ":" + request.getServerPort()
 + path + "/";
 System.out.println("basePath="+basePath);
%>




js/jquery-1.7.2.min.js">

JAVA servlet代码：

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 net.sf.json.JSONArray;

public class ValueGetController extends HttpServlet {
 
 private static final long serialVersionUID = -1293610555518403602L;


 /**
 * Constructor of the object.
 */
 public ValueGetController() {
 super();
 }

 /**
 * Destruction of the servlet. 

 */
 public void destroy() {
 super.destroy(); // Just puts "destroy" string in log
 // Put your code here
 }

 /**
 * 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 {

 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("GBK");
 response.setContentType("text/html;charset=gbk");
 PrintWriter out = response.getWriter();
 String action = request.getParameter("action");
 System.out.println("action"+action);
 if (action.equals("GetFirstFloorValue")) {
 String[] str = GetFirstFloorValue();
 JSONArray ja = JSONArray.fromObject(str);
 String json = ja.toString();
 out.print(json);
 System.out.println(json);
 out.flush();
 out.close();
 return;
 }
 out.flush();
 out.close();
 }

 private String[] GetFirstFloorValue() {
 String[] str = new String[4];
 str[0] = "test1";
 str[1] = "test2";
 str[2] = "test3";
 str[3] = "test4";
 return str;

 }

 

}

关于servlet的web.xml配置：

<?xml version="1.0" encoding="UTF-8"?>

 
 This is the description of my J2EE component
 This is the display name of my J2EE component
 ValueGetController
 servlet.ValueGetController
 

 
 ValueGetController
 /ValueGetController
 
 
 
 
 
 index.jsp