$(document).ready(function(){})：定义页面装载完成时，需要执行的方法。
$()获得页面指定的节点，参数是某种CSS的选择器。返回的是一个JQuery对象，可在其上执行JQuery方法。
val()方法可以获得节点的value属性值
html()设定某个节点中的html内容
click()相应鼠标点击事件
keyup()相应键盘弹起事件
$.get()可以和服务器进行get方式的交互，注册的callback方法会在数据回来的时候被调用，此方法会接收到代表服务器端返回数据的一个纯文本的参数
addClass()removeClass()给某个节点增加或删除一个class
解决中文乱码问题：发送给服务器端的数据在js中做两次encodeURI，然后在服务器端的代码中按UTF-8的方式做一次URLDecode
主要代码：
$.get("http://localhost:8080/JQueryStudy/UserVerify?userName=" + encodeURI(encodeURI(userName)),null,
function(response){
$("#result").html(response);
}
)
处理的Servlet
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package com.linying;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URLDecoder;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* 用户名验证Servlet
* @author Ying-er
* @time 2010-4-25下午08:02:08
* @version 1.0
*/
public class UserVerify extends HttpServlet {
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
* @param request servlet request
* @param response servlet response
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
String param = request.getParameter("userName");
if (param == null || param.length() == 0) {
out.println("用户名不能为空");
} else {
String userName = URLDecoder.decode(param, "UTF-8");
System.out.println(userName);
if (userName.equals("Ying-er")) {
out.println("用户名[" + userName + "]已经存在，请使用别的用户名注册");
} else {
out.println("可以使用用户名[" + userName + "]注册");
}
}
} finally {
out.close();
}
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet">
/**
* Handles the HTTP <code>GET</code> method.
* @param request servlet request
* @param response servlet response
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP <code>POST</code> method.
* @param request servlet request
* @param response servlet response
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
*/
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}
posted on 2010-04-25 20:10
Ying-er 阅读(942)
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