Fastjson supports converting beans to JSON and converting JSON back to beans

 public class Sign {

    
     private String sno;//	学号
    
     private String sname;//	学生名
    
     private String signtime;//	签到时间
    
     private String coursename;//		课程名
    
     private String teachername;//授课教师名
    
     private String coursetime;//这门课程的上课时间
    
     public Sign(String sno, String sname, String signtime, String coursename, 
    
     String teachername, String coursetime) {
    
     this.sno = sno;
    
     this.sname = sname;
    
     this.signtime = signtime;
    
     this.coursename = coursename;
    
     this.teachername = teachername;
    
     th