Fastjson中bean转json和json转bean

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;
        this.coursetime = coursetime;
    }
    @Override
    public String toString() {
        return "Sign{" +
                "sno='" + sno + '\'' +
                ", sname='" + sname + '\'' +
                ", signtime='" + signtime + '\'' +
                ", coursename='" + coursename + '\'' +
                ", teachername='" + teachername + '\'' + '\'' +
                ", coursetime='" + coursetime + '\''