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JSON 

JSON必须键值对
慕课网Json学习笔记
加油吧

 

 1.JSON介绍

 1 <!DOCTYPE html>
 2 <html>
 3 <head>
 4 <meta charset="UTF-8">
 5 <title>Insert title here</title>
 6 <script type="text/javascript" >
 7     var json=[
 8     {
 9         "empno": 7369,
10         "ename": "李宁",
11         "job": "软件工程师",
12         "hiredate": "2017-05-12",
13         "salary": 13000,
14         "dname": "研发部"
15     },
16     {
17         "empno": 7499,
18         "ename": "王乐",
19         "job": "客户经理",
20         "hiredate": "2017-04-22",
21         "salary": 10000,
22         "dname": "市场部",
23         "customers": [
24             {
25                 "cname": "小王"
26             },
27             {
28                 "cname": "小罗"
29             }
30         ]
31     }
32 ];
33     console.log(json);
34     for(var i=0;i<json.length;i++){
35         var emp=json[i];
36         document.write("<h1>");
37         document.write(emp.empno);
38         document.write(","+emp.ename);
39         document.write(","+emp.job);
40         document.write(","+emp.hiredate);
41         document.write(","+emp.salary);
42         document.write(","+emp.dname);
43         document.write("</h1>");
44         
45         if(emp.customers!=null){
46             document.write("<h2>---");
47             for(var j=0;j<emp.customers.length;j++){
48                 var customer=emp.customers[j];
49                 document.write(customer.cname+" ");
50             }
51             document.write("</h2>");
52         }
53     }
54 </script>
55 </head>
56 <body>
57     
58 </body>
59 </html>

 

 2.JSON与字符串转换

 

 

 1 <title>字符串转JSON</title>
 2 <script type="text/javascript">
 3     var str="{\"class_name\":\"五年级三班\"}";//str.name
 4     var json=JSON.parse(str);
 5     console.log(str);
 6     console.log(json);
 7     document.write("班级:"+json.class_name);
 8 </script>
 9 
10 <title>JSON转字符串</title>
11 <script type="text/javascript">
12     var json={"class_name":"五年级四班"};
13     var str1=JSON.stringify(json);
14     console.info(str1);
15     console.info(json);
16     console.log(str1);
17     console.log(json);
18     var json1={};
19     json1.name="哈哈哈"
20     console.info(json1);
21 
22 </script>

 

3.JSON与Java交互

 

 

 

 1 package json;
 2 
 3 import java.util.Date;
 4 
 5 import com.alibaba.fastjson.annotation.JSONField;
 6 
 7 import sun.java2d.d3d.D3DScreenUpdateManager;
 8 
 9 public class Employee {
10     private Integer empno;
11     private String ename;
12     private String job;
13     //@JSONField(format = "yyyy-MM-dd HH:mm:ss SSS")
14     @JSONField(name="hiredate" ,format = "yyyy-MM-dd" )
15     private Date hdate;
16     private Float salary;
17     @JSONField(serialize=false )
18     private String dname;
19     
20     public Employee() {
21         super();
22     }
23     public Employee(Integer empno, String ename, String job, Float salary,String dname,  Date hdate) {
24         super();
25         this.empno = empno;
26         this.ename = ename;
27         this.job = job;
28         this.hdate = hdate;
29         this.salary = salary;
30         this.dname = dname;
31     }
32     
33     public Integer getEmpno() {
34         return empno;
35     }
36     public void setEmpno(Integer empno) {
37         this.empno = empno;
38     }
39     public String getEname() {
40         return ename;
41     }
42     public void setEname(String ename) {
43         this.ename = ename;
44     }
45     public String getJob() {
46         return job;
47     }
48     public void setJob(String job) {
49         this.job = job;
50     }
51     public Date getHdate() {
52         return hdate;
53     }
54     public void setHdate(Date hdate) {
55         this.hdate = hdate;
56     }
57     public Float getSalary() {
58         return salary;
59     }
60     public void setSalary(Float salary) {
61         this.salary = salary;
62     }
63     public String getDname() {
64         return dname;
65     }
66     public void setDname(String dname) {
67         this.dname = dname;
68     }
69     
70 }

 

 1 package json;
 2 
 3 import java.util.*;
 4 
 5 import com.alibaba.fastjson.JSON;
 6 
 7 public class FastJsonSample1 {
 8     public static void main(String[] args) {
 9         Date date = new Date();
10         Calendar c=Calendar.getInstance();
11         c.set(2020, 1, 30, 0, 0, 0);
12         Employee employee=new Employee(4488,"奇锋","前端工程师",1000f,"市场部",c.getTime());
13         
14         //序列化：FastJSON中提供了JSON对象，完成对象与JSON字符串的互相转换
15         String json=JSON.toJSONString(employee);
16         System.out.println(json);
17         
18         //反序列化：FastJSON,json转其他对象  
19         Employee emp=JSON.parseObject(json,Employee.class);
20         System.out.println(emp.getEname());
21     }
22 }

 

 

package json;

import java.util.*;

import com.alibaba.fastjson.JSON;
import com.sun.org.apache.bcel.internal.generic.NEW;

import sun.management.counter.Variability;

public class FastJsonSample2{
    public static void main(String[] args) {
        List emplist=new ArrayList();
        for(int i=1;i<=100;i++) {
            Employee employee=new Employee();
            employee.setEmpno(4488+i);
            employee.setEname("员工"+i);
            emplist.add(employee);
        }
        
        //序列化：FastJSON中提供了JSON对象，完成对象与JSON字符串的互相转换
        String json=JSON.toJSONString(emplist);
        System.out.println(json);


        //反序列化：FastJSON,json转其他对象  
        List<Employee> emps=JSON.parseArray(json,Employee.class);
        for(Employee e:emps) {
            System.out.println(e.getEmpno()+":"+e.getEname());
        }

    }
}

 

posted @ 2020-02-13 00:11  奇奇锋  阅读(108)  评论(0)  编辑  收藏  举报
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