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：
时间： 2024-10-22 06:58:02