Jquery+ajax+JAVA(servlet)实现下拉菜单异步取值

<% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; System.out.println("basePath="+basePath); %>

记录信息：

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,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;

}

}

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