如何使用的是post方法该如何传递数据呢?
在XMLHttpRequest对象中如何通过POST方法传递数据呢?JSON格式的数据应该怎么生成,formData格式的数据后端是如何进行解析的呢?请老师指点一下
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2018-11-08 09:52:56
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> <script type="text/javascript" src="resource/js/jquery-3.3.1.js"></script> <% String basePath=request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getContextPath()+"/"; %> </head> <body> <input type="button" value="查看Java课程" onclick="showJava()"> <input type="button" value="查看C课程" onclick="showC()"> <div id="content"></div> </body> <script> function showJava(){ var xmlHttp=new XMLHttpRequest(); xmlHttp.open("POST","<%=basePath %>/ClassesServlet",true); xmlHttp.send("flag=1"); xmlHttp.onreadystatechange=function(){ if(xmlHttp.readyState=="4"&&xmlHttp.status=="200"){ var result=xmlHttp.responseText; document.getElementById("content").innerHTML=result.html; } } } function showC(){ var xmlHttp=new XMLHttpRequest(); xmlHttp.open("POST","<%=basePath %>/ClassesServlet","true"); xmlHttp.send("flag=2"); xmlHttp.onreadystatechange=function(){ if(xmlHttp.readyState=="4"&&xmlHttp.status=="200"){ var result=xmlHttp.responseText; document.getElementById("content").innerHTML=result.html; } } } </script> </html>
package com.imooc.servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.json.JSONObject; @WebServlet("/ClassesServlet") public class ClassesServlet extends HttpServlet { protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String flag=request.getParameter("flag"); JSONObject jsonObject=null; if(flag.equals("1")){ jsonObject=new JSONObject("{html:java基础<br>java Web}"); } else if(flag.equals("2")){ jsonObject=new JSONObject("{html:C语言基础<br>C语言实战}"); } response.getOutputStream().write(jsonObject.toString().getBytes("utf-8")); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }
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