今天完成的事情：

把查询结果和修改结果里面的毕业时间用年月日展示出来，传入数据库的时候又变回时间戳

package com.controller;


import com.DAO.StudentMapper;
import com.POJO.ChangeType;
import com.POJO.DateTypeChange1;
import com.POJO.Student;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import java.io.IOException;
import java.util.List;

@Controller
@RequestMapping("/user")
public class mvcController {
    Student student;
    @Autowired
    StudentMapper studentMapper;
    
    @RequestMapping("/searchbyid")
    public String jumptosearchid( ) throws IOException {
        return "searchbyid";
    }
    /*
     * 根据ID查询信息
     *
     * */
    @RequestMapping(value = "/list",method = RequestMethod.GET)
    public String select( Integer ID, Model model) throws Exception {
        student = studentMapper.findUserById(ID);
        DateTypeChange1 newstu =  ChangeType.dateTypeChange1(student);
        model.addAttribute("student", newstu);
        return "list";
    }
    /**
     * 新增用户
     */
    @RequestMapping("/new")
    public String turntoinsert( ) throws IOException {
        return "insert";
    }
    @RequestMapping(value = "/add")
    public String insert(Student newStudent,Model model) throws Exception {
        studentMapper.insertUser(newStudent);
        Integer a = newStudent.getID();
        model.addAttribute("message2",a);
        return "addcomplate";
    }
    /**
     * 删除用户
     */
    @RequestMapping(value = "/deletebyid/{ID}")
    public String delect(@PathVariable("ID") int ID, Model model) throws Exception {
        int a = studentMapper.deleteUser(ID);
        String message;
        if (a == 1) {
            message = "数据删除成功";
        } else {
            message = "数据删除失败";
        }
        model.addAttribute("message", message);
        return "deletebyid";
    }
    /**
     * 修改用户
     */
    @RequestMapping(value = "/list/{ID}",method = RequestMethod.GET)
    public String jumptoupdate(@PathVariable("ID") Integer ID, Model model) throws Exception {
        student = studentMapper.findUserById(ID);
        DateTypeChange1 newstu =  ChangeType.dateTypeChange1(student);
        model.addAttribute("student", newstu);
        return "updatebyid";
    }
    @RequestMapping(value = "/updatecomplate")
    public String update(DateTypeChange1 updatestudent,Model model) throws Exception {
        System.out.println(updatestudent);
        Student newstu1 = ChangeType.LongTypeChange(updatestudent);
        System.out.println(newstu1);
        int s = studentMapper.updateUser(newstu1);
        String message;
        if (s == 1) {
            message = "数据修改成功";
        } else {
            message = "数据修改失败";
        }
        model.addAttribute("message", message);
        return "updatecomplate";
    }
    /**
     * 根据姓名模糊查询
     */
    @RequestMapping(value = "/searchbyname")
    public String jumptosearchbyname() throws Exception {
        return "searchbyname";
    }
    @RequestMapping(value = "/listbyname",method = RequestMethod.GET)
    public String selectByName(String name, Model model) throws Exception {
        List<Student> studentlist = studentMapper.findUserByName(name);
        System.out.println(studentlist);
        model.addAttribute("lists",studentlist);
        return "listbyname";
    }
}

package com.POJO;

import java.text.ParseException;
import java.text.SimpleDateFormat;
public class ChangeType {
        public static DateTypeChange1 dateTypeChange1(Student s) {
            DateTypeChange1 dtc=new DateTypeChange1();
            dtc.setID(s.getID());
            dtc.setName(s.getName());
            dtc.setQQ(s.getQQ());
            dtc.setOnlineNumber(s.getOnlineNumber());
            dtc.setProfessionType(s.getProfessionType());
            dtc.setDailyLink(s.getDailyLink());
            dtc.setPromise(s.getPromise());
            dtc.setBrotherName(s.getBrotherName());
            dtc.setPhone(s.getPhone());
            dtc.setMail(s.getMail());
            //毕业时间类型转换转换Long转换到Date
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            String timechange1=sdf.format(s.getEnrollmentTime());
            dtc.setEnrollmentTime(timechange1);
            return dtc;
        }
        public static Student LongTypeChange(DateTypeChange1 s) throws ParseException {
            Student dtc = new Student();
            dtc.setID(s.getID());
            dtc.setName(s.getName());
            dtc.setQQ(s.getQQ());
            dtc.setOnlineNumber(s.getOnlineNumber());
            dtc.setProfessionType(s.getProfessionType());
            dtc.setDailyLink(s.getDailyLink());
            dtc.setPromise(s.getPromise());
            dtc.setBrotherName(s.getBrotherName());
            dtc.setPhone(s.getPhone());
            dtc.setMail(s.getMail());
            //毕业时间类型转换Date转换到Long
            SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy-MM-dd");
            Long timechange1=sdf1.parse(s.getEnrollmentTime()).getTime();
            dtc.setEnrollmentTime(timechange1);
            return dtc;
        }
}

明天计划的事情：

把模糊查询的结果也改为年月日的显示方式，试试分页查询 
遇到的问题：

一开始显示年月日还好，第二部将已有的时间转换为时间戳遇到问题

收获：

单步调试