package com.example.demo.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.NotEmpty;
import org.hibernate.validator.constraints.Length;
@Entity
@Table(name = "userinfo")
public class User {
@Id
@GeneratedValue
private long id;
@Column(nullable = false, unique = true)
@NotEmpty(message="用户名不能为空")
private String userName;
@Column(nullable = false)
@NotEmpty(message="密码不能为空")
@Length(min=6, message="密码长度不能少于6位")
private String password;
@Column(nullable = false)
private int age;
//必须有构造
public User() {
}
public long getId() {
return id;
}
public User setId(long id) {
this.id = id;
return this;
}
public String getUserName() {
return userName;
}
public User setUserName(String userName) {
this.userName = userName;
return this;
}
public String getPassword() {
return password;
}
public User setPassword(String password) {
this.password = password;
return this;
}
public int getAge() {
return age;
}
public User setAge(int age) {
this.age = age;
return this;
}
}
2、继承JpaRepository类会自动实现很多内置的方法
package com.example.demo.repository;
import org.springframework.data.jpa.repository.JpaRepository;
import com.example.demo.entity.User;
public interface UserRepository extends JpaRepository {
User findById(long id);
void deleteById(Long id);
}
五、业务层
service调用jpa实现相关的增删改查，实际项目中service层处理具体的业务代码。
1、UserService.java
package com.example.demo.service;
import java.util.List;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import com.example.demo.entity.User;
public interface UserService {
public Page getUserPage(Pageable pageable);
public List getUserList();
public User findUserById(long id);
public void save(User user);
public void edit(User user);
public void delete(long id);
}
2、UserServiceImpl.java
package com.example.demo.service.impl;
import java.util.List;
import java.util.Optional;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Service;
import com.example.demo.entity.User;
import com.example.demo.repository.UserRepository;
import com.example.demo.service.UserService;
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserRepository userRepository;
@Override
public Page getUserPage(Pageable pageable) {
return userRepository.findAll(pageable);
}
@Override
public List getUserList() {
return userRepository.findAll();
}
@Override
public User findUserById(long id) {
return userRepository.findById(id) ;
}
@Override
public void save(User user) {
userRepository.save(user);
}
@Override
public void edit(User user) {
userRepository.save(user);
}
@Override
public void delete(long id) {
userRepository.deleteById(id);
}
}
六、控制层
package com.example.demo.web.controller;
import java.util.List;
import javax.annotation.Resource;
import javax.validation.Valid;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.data.domain.Sort.Direction;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.validation.ObjectError;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import com.example.demo.entity.User;
import com.example.demo.service.UserService;
@Controller
public class UserController {
@Resource
UserService userService;
@RequestMapping("/")
public String index() {
return "redirect:/list";
}
@RequestMapping("/list")
public String list(Model model) {
List users=userService.getUserList();
model.addAttribute("users", users);
/*int page=1,size=2;
Sort sort = new Sort(Direction.DESC, "id");
Pageable pageable = PageRequest.of(page, size, sort);
model.addAttribute("users", pageable);*/
return "user/list";
}
@RequestMapping("/toAdd")
public String toAdd() {
return "user/userAdd";
}
@RequestMapping("/add")
public @ResponseBody User add(@Valid User user, BindingResult result) {
if (result.hasErrors()) {
List list = result.getAllErrors();
for (ObjectError error : list) {
System.out.println(error.getDefaultMessage());
}
return null;
}
userService.save(user);
return user;
}
@RequestMapping("/toEdit")
public String toEdit(Model model,Long id) {
User user=userService.findUserById(id);
model.addAttribute("user", user);
return "user/userEdit";
}
@RequestMapping("/edit")
public String edit(User user) {
userService.edit(user);
return "redirect:/list";
}
@RequestMapping("/delete")
public String delete(Long id) {
userService.delete(id);
return "redirect:/list";
}
}
