$.get(url,data,success(response,status,xhr),dataType)
url：必需。规定将请求发送的哪个 URL。
data：可选。规定连同请求发送到服务器的数据。
success(response,xhr)：可选。规定当请求成功时运行的函数。
额外的参数：
response - 包含来自请求的结果数据
status - 包含请求的状态
xhr - 包含 XMLHttpRequest 对象
dataType：可选。规定预计的服务器响应的数据类型。
默认地，jQuery 将智能判断。
可能的类型：”xml”“html”“text”“script”“json”“jsonp”
【JSP页面】
<%@ 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%>">
<title>My JSP 'post.jsp' starting page</title>
<Meta http-equiv="pragma" content="no-cache">
<Meta http-equiv="cache-control" content="no-cache">
<Meta http-equiv="expires" content="0">
<Meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<Meta http-equiv="description" content="This is my page">
<!-- <link rel="stylesheet" type="text/css" href="styles.css"> -->
<script type="text/javascript" src="./scripts/jquery-1.7.2.js"></script>
<script type="text/javascript"> var url =""; var queryString = ""; $(function(){ $("input[type='button']").click(function(){ url = $("#editform").attr("action"); queryString = $('#editform').serialize(); $.get(url+"?querystring="+queryString,queryString,function(data){ //querystring=username=yanshi02&password=123456&username=yanshi02&password=123456 //resultJson ...{"username":"yanshi02","querystring":"username=yanshi02","password":"123456"} //$.get(url+"?querystring="+queryString,function(data){ //querystring=username=yanshi02&password=123456 //resultJson ...{"querystring":"username=yanshi02","password":"123456"} //$.get(url,function(data){ //username=yanshi02&password=123456 //resultJson ...{"username":"yanshi02","password":"123456"} alert(data); },"json"); }); }); </script>
</head>
<body>
This is my JSP page. <br>
<form id="editform" action="postServlet2" method="get">
<input type="text" name="username" value=""/>
<input type="password" name="password" value=""/>
</form>
<input name="post" type="button" value="提交"/>
</body>
</html>
如下图标明：
get方式 数据都在Query String Parameters里面！！！
【后台接收思路】：
讲post的时候已经说明，request.getReader()只能获取请求体(form data)的数据，URL的数据(query string)获取不到！
① 使用request.getParameterMap;
该方法不分Form Data or Query String Parameters,而是将数据以Map<String,String[]>返回。同名称的key对应的值，组成一个String[ ];
参考前篇post 的后台接收方法2：后台接收方法2
http://www.jb51.cc/article/p-omnjnxei-bpe.html
② 使用request.getQueryString;
package com.atgui.ajax.app.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.codehaus.jackson.map.ObjectMapper;
public class GetServlet extends HttpServlet {
/** * Destruction of the servlet. <br> */
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
public void doGet(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException {
doPost(request,response);
}
public void doPost(HttpServletRequest request,IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
//拿到$("#editform").serialize();
String jsonString =request.getQueryString() ;
System.out.println(jsonString);
//通过拿到的querystring转换为map
HashMap<String,Object> map = getMapFromQueryString(jsonString);
//将转换得到的map转换为json并返回
ObjectMapper objectMapper = new ObjectMapper();
String resultJson = objectMapper.writeValueAsString(map);
System.out.println("resultJson ..."+resultJson);
out.print(resultJson);
out.flush();
out.close();
}
public void init() throws ServletException {
// Put your code here
System.out.println("getServlet init()....");
}
public HashMap<String,Object> getMapFromQueryString(String queryString) {
//这个方法可能不适用你
HashMap map = new HashMap<String,String>();
String[] qStrings = queryString.split("&");
for (String string : qStrings) {
String[] qStrings2 = string.split("=");
map.put(qStrings2[0],qStrings2[1]);
}
return map;
}
}
result as follows ：
getServlet init()....
username=yanshi02&password=123456
resultJson ...{"username":"yanshi02","password":"123456"}
此时的json为typeof data = object 可以直接使用data.key 获取属性，不用进行转换！！！
题外话
上面所传输的数据格式为username=yanshi02&password=123456。
如果传输的数据为JSON形式呢？
queryString = $('#editform').serializeArray();//object
queryString = JSON.stringify(queryString);//string
原文链接：https://www.f2er.com/ajax/161439.html