1、關(guān)于Ajax交互的步驟

1.1 ?獲取到xmlhttprequest

1.2 ?設(shè)置xmlhttprequest的onreadystatechange響應(yīng)事件

1.3 ?準(zhǔn)備獲取ajax請(qǐng)求?xmlhttp.open("POST", "AjaxServerlet", true);

1.4 ?設(shè)置消息頭為表單形式,模仿表單的POSt提交xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");

1.5 ?發(fā)送ajax請(qǐng)求xmlhttp.send("age=18&name=zhang"); ?//Ajax的POST請(qǐng)求,參數(shù)是通過xmlhttp.send()方法攜帶的

1.6 ?處理Ajax交互獲取到的數(shù)據(jù),具體的處理在xmlhttprequest的onreadystatechange響應(yīng)事件中實(shí)現(xiàn)

2、Ajax與Java的Servlet通過POSt交互

2.1

html代碼

點(diǎn)擊

? ? ?2.2 JavaScript代碼

//1、獲取到xmlhttprequest

function getXmlhttp() {

var xmlhttp;

if (window.XMLHttpRequest) { // code for IE7+, Firefox, Chrome, Opera, Safari

xmlhttp = new XMLHttpRequest();

} else { // code for IE6, IE5

xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");

}

return xmlhttp;

}

window.onload = function() {

document.getElementById('mybtn').onclick = function() {

//1、獲取到xmlhttprequest 對(duì)象

var xmlhttp = getXmlhttp();

//2、xmlhttprequest的響應(yīng)事件

xmlhttp.onreadystatechange = function() {

if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {

//5、操作獲取到的信息

//5.1ajax返回的數(shù)據(jù),轉(zhuǎn)換為javascript對(duì)象

// 5.1.1 利用eval實(shí)現(xiàn)轉(zhuǎn)換

var ajaxResult = eval("(" + xmlhttp.responseText + ")");

//5.1.2 利用jquery的方法,對(duì)于jQuery.parseJSON(),鍵值必須為雙引號(hào)

/* var ajaxResult = jQuery.parseJSON(xmlhttp.responseText); */

alert(ajaxResult)

//5.2獲取JavaScript對(duì)象的屬性

var age = ajaxResult.age;

var name = ajaxResult.name;

//5.3獲取到頁(yè)面的DIV,并設(shè)置內(nèi)容

var mydiv = document.getElementById("myAjax");

mydiv.innerHTML = "name:" + name + "," + "age:" + age;

}

}

//3、準(zhǔn)備獲取ajax請(qǐng)求

//3.1 對(duì)于get請(qǐng)求,帶參數(shù)的方式,直接在open函數(shù)的請(qǐng)求地址帶上參數(shù)

xmlhttp.open("POST", "AjaxServerlet", true);

//4、發(fā)送ajax請(qǐng)求

xmlhttp.setRequestHeader("Content-type",

"application/x-www-form-urlencoded");

xmlhttp.send("age=18&name=zhang");

};

}

? ? ? ?2.3 ?style代碼

#myAjax {

width: 400px;

height: 400px;

border: 1px dashed red;

text-align: center; /* div中的文字水平方向居中顯示 */

line-height: 400px; /*這個(gè)和div的高度相同,div中的文字就會(huì)垂直方向居中顯示 */

font-size: 16px;

font-weight: bold;

}

? ? ?2.4 ?AjaxServerlet.java代碼

public class AjaxServerlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

String age = request.getParameter("age");

String name = request.getParameter("name");

Person person = new Person(name, age);

String personJSON = "{\"name" + "\":\"" + name + "\"," + "\"age"

+ "\":" + age + "}";

System.out.println(personJSON);

response.getWriter().write(personJSON);

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

doGet(request, response);

}

}2.5web.xml代碼

AjaxServerlet

com.ajax.com.AjaxServerlet

AjaxServerlet

/AjaxServerlet

index.html

原文：http://blog.csdn.net/zbw18297786698/article/details/51330357

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