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ajax的兩種提交方式(get/post)和兩種版本

最近比較閑，就把以前用過的技術串一下做個手札，方便以后自己偷懶，小鳥你們幸福了。

首先主要是將javascript版本ajax做下注釋：ajax異步刷新主要是將所需條件拼成字符串傳入后臺，處理之后，直接調用回調函數(shù)將所得數(shù)據(jù)返還給頁面，并加以顯示，因為還在本頁面，所以不用刷新頁面，懂了了吧，本篇也用encodeURI對字符串做了加密，并在類里做了解碼，其中需要一些注意的地方在源碼里做了注釋。get/post兩種提交方式，但get提交容易亂碼，一定多加注意

jsp頁面：

復制代碼代碼如下:

 
%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 
% 
String path = request.getContextPath(); 
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 
%> 

!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 
html> 
head> 
base href="%=basePath%>"> 
script type="text/javascript" > 
var xmlHttp; 
function createxmlHttpRequest(){ 
if(window.XMLHttpRequest){ 
xmlHttp= new XMLHttpRequest();//IE7+,FireFox,Opera,Safari,Chrome 
}else{ 
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP"); 
} 
} 
function test(){//get 
//獲取參數(shù) 
//var unames=encodeURI(document.getElementById("username").value);//一次編碼java用new String(name.getBytes("ISO8859-1"), "UTF-8"）解碼 
var unames=encodeURI(encodeURI(document.getElementById("username").value));//兩次編碼才能用java.net.URLDecoder.decode(name,"utf-8");解碼 
var pws=encodeURI(document.getElementById("password").value); 
createxmlHttpRequest(); 
xmlHttp.onreadystatechange=readyState; 
//function(){ 
//alert(xmlHttp.readyState+"=="+xmlHttp.status);//判斷請求狀態(tài) 
//} 
xmlHttp.open("get","AjaxServlet1?msg=getsname="+unames+"pwd="+pws+"timeStamp="+new Date().getTime(),true); //get 方式提交中文會出現(xiàn)亂碼，encodeURI()/encodeURIComponent()將中文轉成16進制編碼，把字符串作為URI進行編碼 
xmlHttp.send(null); 
} 
function testp(){//post 
//獲取參數(shù) 
var unames=document.getElementById("username").value; 
var pws=document.getElementById("password").value; 
createxmlHttpRequest(); 
xmlHttp.onreadystatechange=readyState; 
xmlHttp.open("post","AjaxServlet1",true); 
xmlHttp.setRequestHeader("Content-type","application/x-www-form-urlencoded"); 
var str="msg=postsname="+unames+"pwd="+pws+"timeStamp="+new Date().getTime(); 
xmlHttp.send(str);//send 可用于傳參 
} 

function readyState(){ 
if(xmlHttp.readyState==4){ 
if(xmlHttp.status==200){ 
var msg= xmlHttp.responseText; 
//alert(msg); 
document.getElementById("result").innerHTML=msg; 
} 
} 
} 
/script> 
title>js異步刷新/title> 
/head> 

body> 
center> 
div id="response"> 
/div> 
用戶：input type="text" name="uname" id="username">br> 
密碼：input type="text" name="pw" id="password">br> 
input type="button" name="button" value="get確定" onclick="test();"/> 
input type="button" name="button" value="post確定" onclick="testp();"> 
div id="result"> 
/div> 
/center> 
/body> 

/html> 

這里是servlet/action Java代碼:

復制代碼代碼如下:

 
package com.cstp.javascript; 

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; 

@SuppressWarnings("serial") 
public class AjaxServlet1 extends HttpServlet { 

public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException { 
this.doPost(request, response); 
} 

public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException { 
//設置編碼，防止亂碼 
response.setCharacterEncoding("utf-8"); 
request.setCharacterEncoding("utf-8"); 
//接收參數(shù) 
String msg=request.getParameter("msg"); 
if(msg.equals("gets")){ 
// String name=new String(request.getParameter("name").getBytes("ISO8859-1"), "UTF-8"); //一次編碼，java里進行解碼操作 
String name=java.net.URLDecoder.decode(request.getParameter("name"),"utf-8"); //decode解碼頁面必須兩次編碼，java里進行解碼操作 
String pwd=request.getParameter("pwd"); 
System.out.println(name+","+pwd); 
PrintWriter out = response.getWriter(); 
out.println("ajax響應get，結果返回"+name+","+pwd); 
}else if(msg.equals("posts")){ 
String name=new String(request.getParameter("name").getBytes("utf-8"), "UTF-8"); //一次編碼，java里進行解碼操作 
String pwd=request.getParameter("pwd"); 
System.out.println(name+","+pwd); 
PrintWriter out = response.getWriter(); 
out.println("ajax響應post，結果返回"+name+","+pwd); 
} 

} 
} 

上面是javascript版ajax，下面將喜歡jquery版的也分享給JQ友們：

頁面上：

復制代碼代碼如下:

 
script type="text/javascript"> 
//方式① 
function circum(lon,lat){ 
$.ajax({ 
url: "JQAjaxServlet?method=jsons", 
contentType: "application/x-www-form-urlencoded; charset=utf-8", 
type : 'post', 
dataType:"json", 
async: false, 
data : { //傳參給后臺 
'lon' : lon, 
'lat' : lat 
}, 
success: function (data) { // 接后臺返回result 
在這里data為后臺返回數(shù)據(jù)，你可以盡情處理了 
} 
}); 
} 

/script> 