1，复制一个项目，改名为SpringDataValid，关闭其他项目，以防干扰。右键项目，Maven，Update Project...

2，新建一个数据库，db_studentinfo,修改配置文件里的数据库连接。

server:
port: 8888
context-path: /
spring:
datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/db_studentinfo
    password: root
    username: root
jpa:
    hibernate:
      ddl-auto: update
    show-sql: true

3，新建一个Student实体，指定表名 t_student,添加注解，Integer类型就不用加长度限制，姓名不能为空，年龄不能为空，且年龄不能小于18岁，

package com.cruise.entity;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.validation.constraints.Min;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotEmpty;
import javax.validation.constraints.NotNull;

@Entity
@Table(name="t_student")
public class Student {

   @Id
   @GeneratedValue
   private Integer id;

   @NotBlank(message="输入的名字无效！")
   @NotEmpty(message="姓名不能为空！")
   @Column(length=50)
   private String name;

   @NotNull(message="年龄不能为空！")
   @Min(value=18,message="年龄必须大于18岁！")
   private Integer age;

   public Integer getId() {
       return id;
   }

   public void setId(Integer id) {
       this.id = id;
   }

   public String getName() {
       return name;
   }

   public void setName(String name) {
       this.name = name;
   }

   public Integer getAge() {
       return age;
   }

   public void setAge(Integer age) {
       this.age = age;
   }
}

4，StudentDao接口，添加继承

package com.cruise.dao;

import org.springframework.data.jpa.repository.JpaRepository;

import com.cruise.entity.Student;

public interface StudentDao extends JpaRepository{

}

5，StudentService接口，写接口方法，添加学生信息，

package com.cruise.service;

import com.cruise.entity.Student;

public interface StudentService {

public void add(Student student);
}

6，写StudentServiceImpl 实现StudentService接口，注入StudentDao接口。删除Account相关的类，方式干扰，

package com.cruise.service.impl;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;

import com.cruise.dao.StudentDao;
import com.cruise.entity.Student;
import com.cruise.service.StudentService;

/**
*
* @author pengc
*
*/
@Service("studentService")
public class StudentServiceImpl implements StudentService {

   @Resource
   private StudentDao studentDao;

   @Override
   public void add(Student student) {
       studentDao.save(student);
   }
}

7，写StudentController ，注入StudentService，添加RestController注解(和ResponseBody注解等价，区别在于ResponseBody注解是加在方法上的，)，自动转成json。写add()方法，添加学生信息，

package com.cruise.controller;

import javax.annotation.Resource;
import javax.validation.Valid;

import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.cruise.entity.Student;
import com.cruise.service.StudentService;

@RestController
@RequestMapping("/student")
public class StudentController {

   @Resource
   private StudentService studentService;

   @RequestMapping("/add")
   public String add(@Valid Student student,BindingResult bindingResult){
       if(bindingResult.hasErrors()){
            return bindingResult.getFieldError().getDefaultMessage();
       }else{
           studentService.add(student);
           return "添加成功！";
       }
   }
}

8，写studentAdd.html 方法，导入jquery，ajax 方式提交，

第11讲 11.1 SpringBoot表单校验

见下节...

猜你喜欢