Spring Boot 2.0快速构建服务组件全步骤

public interface UserService{
 // TODO ...
}

@Service(value="userService")
public class UserServiceImpl implements UserService{
 //TODO ...
}

@Controller
public class DemoController{
 @Autowired
 UserService userService;
 //TODO ...
}

package com.ramostear.application.service;

import com.ramostear.application.model.User;

import java.util.Collection;

/**
 * Created by ramostear on 2019/3/11 0011.
 */
public interface UserService {

 /**
 * create user
 * @param user
 */
 void create(User user);

 /**
 * update user info by ID
 * @param id
 * @param user
 */
 void update(long id,User user);

 /**
 * delete user by ID
 * @param id
 */
 void delete(long id);

 /**
 * query all user
 * @return
 */
 Collection<User> findAll();
}

package com.ramostear.application.service.impl;

import com.ramostear.application.model.User;
import com.ramostear.application.service.UserService;
import org.springframework.stereotype.Service;

import javax.annotation.PostConstruct;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

/**
 * @author ramostear
 * @create-time 2019/3/11 0011-4:29
 * @modify by :
 * @since:
 */
@Service(value="userService")
public class UserServiceImpl implements UserService {

 private static Map<Long,User> userRepo = new HashMap<>();

 @PostConstruct
 public void initUserRepo(){
 User admin = new User();
 admin.setId(1).setName("admin");
 userRepo.put(admin.getId(),admin);

 User editor = new User();
 editor.setId(2).setName("editor");
 userRepo.put(editor.getId(),editor);
 }
 @Override
 public void create(User user) {
 userRepo.put(user.getId(),user);
 }

 @Override
 public void update(long id, User user) {
 userRepo.remove(id);
 user.setId(id);
 userRepo.put(id,user);
 }

 @Override
 public void delete(long id) {
 userRepo.remove(id);
 }

 @Override
 public Collection<User> findAll() {
 return userRepo.values();
 }
}

package com.ramostear.application.controller;

import com.ramostear.application.model.User;
import com.ramostear.application.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;

/**
 * @author ramostear
 * @create-time 2019/3/11 0011-4:42
 * @modify by :
 * @since:
 */
@RestController
public class UserController {

 @Autowired
 UserService userService;


 @GetMapping("/users")
 public ResponseEntity<Object> users(){
 return new ResponseEntity<>(userService.findAll(), HttpStatus.OK);
 }

 @PostMapping("/users")
 public ResponseEntity<Object> create(@RequestBody User user){
 userService.create(user);
 return new ResponseEntity<>("User is created successfully.",HttpStatus.CREATED);
 }

 @PutMapping("/users/{id}")
 public ResponseEntity<Object> update(@PathVariable(name="id") long id,@RequestBody User user){
 userService.update(id,user);
 return new ResponseEntity<>("User is updated successfully.",HttpStatus.OK);
 }

 @DeleteMapping("/users/{id}")
 public ResponseEntity<Object> delete(@PathVariable(name = "id")long id){
 userService.delete(id);
 return new ResponseEntity<>("User is deleted successfully.",HttpStatus.OK);
 }
}

package com.ramostear.application.model;

import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;

/**
 * @author ramostear
 * @create-time 2019/3/6 0006-3:12
 * @modify by :
 * @since:
 */
@Getter
@Setter
@NoArgsConstructor
public class User {
 private long id;
 private String name;

 public User setId(long id){
 this.id = id;
 return this;
 }

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