jQuery study notes (1)--Using jQuery to implement asynchronous communication (using json to pass values) specific ideas_jquery

jQuery is a popular js library nowadays, which can produce ideal effects with simple code, just like what the official website says "write less, do more". Jquery has rewritten the previous way of writing JavaScript to a certain extent. I use jquery to achieve the effect of using ajax to achieve asynchronous communication in the previous article, and feel the charm of jquery.

First you need to download the latest js file of jquery and introduce it into the file. You can also download it here: Click me to download.

This communication uses jquery’s jQuery.post(url,[data], [callback],[type]) method, this Is a simple POST request function to replace the complex $.ajax. The callback function can be called when the request is successful. The parameters are: url, [data], [callback], [type] and the corresponding parameter types are String, Map, Function, String:

●url: Send request address.

●data: Key/value parameters to be sent.

●callback: Callback function when sending successfully.

●type: Return content format, xml, html, script, json, text, _default)

Create a new jsp file jqueryDemo.jsp, the code is as follows:

Copy the code The code is as follows:

pageEncoding="GB18030"%>

New user registration
User account:	*
User password:
Repeat password:

Create a new servlet file JqueryServlet.java, the code is as follows:

Copy the code The code is as follows:

package com.ldfsoft.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
/**
*Servlet implementation class JqueryServlet
*/
public class JqueryServlet extendsHttpServlet {
privatestatic final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public JqueryServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#service(HttpServletRequestrequest, HttpServletResponse response)
*/
protectedvoid service(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {
//TODO Auto-generated method stub
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
String account=request.getParameter("strAccount");
PrintWriter out=response.getWriter();
String str=""; //鐢ㄤ互json浼犲