ajax 接收json,xml类型数据_ajax 中datatype=xml-优快云博客

本文链接：https://blog.youkuaiyun.com/javadhh/article/details/36186597

贴一个案例代码，便于日后翻阅

服务器代码：JsonServlet.java

package com.dhh;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.sf.json.JSONArray;
import net.sf.json.JsonConfig;
public class JsonServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

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

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("utf-8");
		response.setContentType("text/xml;charset=utf-8");
		PrintWriter out = response.getWriter();
		
		//1、json格式测试：
		//标准格式：[{stuid:'1',stuname:'张三'},{stuid:'2',stuname:'李四'},{stuid:'3',stuname:'王五'},
		//{stuid:'5',stuname:'赵六'},{stuid:'6',stuname:'邓八'},{stuid:'7',stuname:'陈九'}]
		List<Student> stuLists = new ArrayList<Student>();
		stuLists.add(new Student(001,"张三",20,"打球1"));
		stuLists.add(new Student(002,"李四",30,"打球2"));
		stuLists.add(new Student(003,"王五",40,"打球3"));
		stuLists.add(new Student(005,"赵六",50,"打球4"));
		stuLists.add(new Student(006,"邓八",60,"打球5"));
		stuLists.add(new Student(007,"陈九",70,"打球6"));
		
		//手动遍历ArrayList，拼凑成json对象，只封装了stuid,stuname字段
// 		StringBuffer buffer = new StringBuffer("[");
// 		for(int i = 0 ;i< stuLists.size(); i++){
// 			Student student = stuLists.get(i);
// 			buffer.append('{');
// 			buffer.append("stuid");
// 			buffer.append(":'");
// 			buffer.append(student.getStuid());
// 			buffer.append("',");
// 			buffer.append("stuname");
// 			buffer.append(":'");
// 			buffer.append(student.getStuname());
// 			buffer.append("'");
// 			buffer.append("}");
// 			buffer.append(',');
// 		}
// 		buffer.deleteCharAt(buffer.length()-1);
// 		buffer.append("]");
//		
//		System.out.println("拼凑出来的结果："+buffer.toString());
//		out.println(buffer.toString());
		
		
		//通过第三方工具类来封装json
		//封装所有的字段
		//JSONArray array = JSONArray.fromObject(stuLists);
		//或者根据业务需求，不用某些字段
		JsonConfig config = new JsonConfig();
		//排除封装age,hobby 字段
		config.setExcludes(new String[]{"age","hobby"});
		JSONArray array = JSONArray.fromObject(stuLists,config);
		
		System.out.println(array.toString());
		out.println(array.toString());
		

		//json简单测试
//		out.print("[{id:20,name:'dhh'},{id:30,name:你懂的}]");
//		//2、xml格式测试
//		out.println("<china>");
//		out.println("<province name='湖南'>");
//		out.println("<city>长沙</city>");
//		out.println("<city>岳阳</city>");
//		out.println("<city>湘潭</city>");
//		out.println("<city>永州</city>");
//		out.println("</province>");
//
//		out.println("<province name='辽宁'>");
//		out.println("<city>沈阳</city>");
//		out.println("<city>鞍山</city>");
//		out.println("<city>大连</city>");
//		out.println("<city>营口</city>");
//		out.println("</province>");
//		out.println("</china>");
	}
}

Html代码：

<!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>Json测试</title>
<script type="text/javascript">
	function ajaxFunction(){
	   var xmlHttp;
	   try{ // Firefox, Opera 8.0+, Safari
	        xmlHttp=new XMLHttpRequest();
	    }
	    catch (e){
		   try{// Internet Explorer
		         xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		      }
		    catch (e){
		      try{
		         xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		      }
		      catch (e){}
		      }
	    }
		return xmlHttp;
	 }
	 
	 
	window.οnlοad=function(){
		//创建xmlHttpRequest对象
		var xmlReq = ajaxFunction();
		//创建服务器监听器
		xmlReq.onreadystatechange = function(){
			if(xmlReq.readyState==4){
				if(xmlReq.status==200)
				{
					//1、json数据测试
					var jsonData = xmlReq.responseText;
					alert("我的数据:"+jsonData);
					//注意：将字符串转换为对象
					var jsonObj = eval("("+jsonData+")");
					//是一个数组类型的json数据
					alert(jsonObj[4].stuname);
					
					//2、xml格式数据测试
//					var provinceXML = xmlReq.responseXML;
//					//得到city字段
//					var provinces = provinceXML.getElementsByTagName("city");
//					alert(provinces.length);
					
				}
			}
		}
		xmlReq.open("post","../JsonServlet?timeStamp="+new Date().getTime(),true);
		xmlReq.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
		xmlReq.send(null);
	}

</script>
</head>
<body>
</body>
</html>