JSON必须键值对
慕课网Json学习笔记
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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()); } } }