JSON：JavaScript 对象表示法（JavaScript Object Notation）。
JSON 是存储和交换文本信息的语法。类似 XML。
JSON 比 XML 更小、更快，更易解析。
JSON 使用 JavaScript 语法来描述数据对象，但是 JSON 仍然独立于语言和平台。JSON 解析器和 JSON 库支持许多不同的编程语言。
使用json来传输单个数据和数组
新建一个数据层：
package com.bean; public class Dog { private String name; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getCategory() { return category; } public void setCategory(String category) { this.category = category; } private int age; private String category; }
实现单个数据传输时：
package com.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; import com.bean.Dog; /** * Servlet implementation class Testjson1 */ @WebServlet("/testjson1") public class Testjson1 extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public Testjson1() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); //摸拟从数据库中查询 Dog d = new Dog(); d.setName("阿黄"); d.setAge(2); d.setCategory("哈士奇"); JSONObject obj = new JSONObject(); obj.put("name", d.getName()); obj.put("age", d.getAge()); obj.put("category", d.getCategory()); JSONObject object = new JSONObject(); object.put("dog1", obj); response.getWriter().append(object.toString()); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <!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=ISO-8859-1"> <title>Insert title here</title> <script type="text/javascript"src="js/jquery-1.11.1.min.js"></script> <script type="text/javascript"> $(document).ready(function(){ $("#d1").click(function(){ $.ajax({ url:"testjson1", data:{}, type:"POST", dataType:"JSON", success:function(httpdata){ $("#d2").append("<p>"+httpdata.dog1.name+"</p>"); $("#d2").append("<p>"+httpdata.dog1.age+"</p>"); $("#d2").append("<p>"+httpdata.dog1.category+"</p>"); } }); }); }); </script> </head> <body> <div id="d1">123123123</div> <div id="d2"></div> </body> </html>
效果如下：
传输一组数据时：
package com.servlet; import java.io.IOException; import java.util.ArrayList; 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.JSONArray; import org.json.JSONObject; import com.bean.Dog; /** * Servlet implementation class Testjson2 */ @WebServlet("/testjson2") public class Testjson2 extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public Testjson2() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); Dog d1 = new Dog(); d1.setName("狗1"); d1.setAge(1); d1.setCategory("品种1"); Dog d2 = new Dog(); d2.setName("狗2"); d2.setAge(2); d2.setCategory("品种2"); Dog d3 = new Dog(); d3.setName("狗3"); d3.setAge(3); d3.setCategory("品种3"); ArrayList<Dog> list = new ArrayList<Dog>(); list.add(d1); list.add(d2); list.add(d3); JSONArray arr = new JSONArray(); for(Dog d:list){ //System.out.println(d.getName()); JSONObject temp = new JSONObject(); temp.put("name", d.getName()); temp.put("age", d.getAge()); temp.put("category", d.getCategory()); arr.put(temp); } JSONObject object = new JSONObject(); object.put("dog1", arr); //response.getWriter().append(obj.toString()); response.getWriter().append(object.toString()); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <!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=ISO-8859-1"> <title>Insert title here</title> <script type="text/javascript"src="js/jquery-1.11.1.min.js"></script> <script type="text/javascript"> $(document).ready(function(){ $("#d1").click(function(){ $.ajax({ url:"testjson2", data:{}, type:"POST", dataType:"JSON", success:function(httpdata){ for(var i=0;i<httpdata.dog1.length;i++){ $("#d2").append("<p>"+httpdata.dog1[i].name+"</p>"); $("#d2").append("<p>"+httpdata.dog1[i].age+"</p>"); $("#d2").append("<p>"+httpdata.dog1[i].category+"</p>"); } } }); }); }); </script> </head> <body> <div id="d1">123123123</div> <div id="d2"></div> </body> </html>
实现效果如下：
