$(document).ready(function(){})：定義頁面裝載完成時，需要執行的方法。
$()獲得頁面指定的節點，參數是某種CSS的選擇器。返回的是一個JQuery對象，可在其上執行JQuery方法。
val()方法可以獲得節點的value屬性值
html()設定某個節點中的html內容
click()相應鼠標點擊事件
keyup()相應鍵盤彈起事件
$.get()可以和服務器進行get方式的交互，注冊的callback方法會在數據回來的時候被調用，此方法會接收到代表服務器端返回數據的一個純文本的參數
addClass()removeClass()給某個節點增加或刪除一個class
解決中文亂碼問題：發送給服務器端的數據在js中做兩次encodeURI，然后在服務器端的代碼中按UTF-8的方式做一次URLDecode
主要代碼：
$.get("http://localhost:8080/JQueryStudy/UserVerify?userName=" + encodeURI(encodeURI(userName)),null,
function(response){
$("#result").html(response);
}
)
處理的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;
/**
* 用戶名驗證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("用戶名不能為空");
} else {
String userName = URLDecoder.decode(param, "UTF-8");
System.out.println(userName);
if (userName.equals("Ying-er")) {
out.println("用戶名[" + userName + "]已經存在，請使用別的用戶名注冊");
} else {
out.println("可以使用用戶名[" + userName + "]注冊");
}
}
} 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 閱讀(953)
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