SpringBoot整合JPA

JPA-SpringBoot/src/main/java/com/jpa/jpaspringboot/controller/UserController.java

@@ -2,34 +2,81 @@ package com.jpa.jpaspringboot.controller;
 
 import com.jpa.jpaspringboot.entity.User;
 import com.jpa.jpaspringboot.service.UserService;
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor;
+import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 
 import java.util.List;
 
 /**
- * GET查，POST改，PUT增，DELETE删
+ * GET查询，POST新增，PUT更新，DELETE删除
  */
 
 @RestController
 @CrossOrigin
-@RequestMapping("/user")
+@RequestMapping("/users")
 public class UserController {
 
-    @Autowired
-    private UserService userService;
+    private final UserService userService;
 
-    @RequestMapping(value = "/find",method = RequestMethod.GET)
-    public List<User> find(){
+    public UserController(UserService userService) {
+        this.userService = userService;
+    }
+
+    /**
+     * 查询所有用户
+     * @return 查询出的用户
+     */
+    @GetMapping
+    public List<User> find() {
         return userService.find();
     }
 
-    @RequestMapping(value = "/add",method = RequestMethod.PUT)
-    public Object add(){
-        userService.add();
-        return 200;
+    /**
+     * 插入一个用户对象
+     *
+     * @param user 待插入的对象，ID为0或者null
+     * @return 插入后的对象，一般来说id会更新
+     */
+    @PostMapping
+    public ResponseEntity<User> insert(@RequestBody User user) {
+        User result = userService.insert(user);// addUsers = add(动词crud) -> http method 代替动词 + User(名词)
+        if (result.getId() == null || result.getId() == 0) {
+            return ResponseEntity.status(400).body(result);
+        } else {
+            return ResponseEntity.ok(result);
+        }
+    }
+
+    /**
+     * 按id删除数据
+     * @param user 需要删除的用户信息
+     * @return
+     */
+    @DeleteMapping("{id}")
+    public ResponseEntity<User> delete(User user){
+        User result = userService.delete(user);
+        if (result.getId() == 0 || result.getId() == null){
+            return ResponseEntity.status(404).body(result);
+        }else {
+            return ResponseEntity.ok(result);
+        }
     }
 
+    /**
+     * 按ID修改用户信息
+     * @param user 用户的信息，根据用户信息中的id查找需要修改的用户信息
+     * @return
+     */
+    @PutMapping("{id}")
+    public ResponseEntity<User> update(@RequestBody User user){
+        User result =  userService.update(user);
+        if (result.getId() == 0 || result.getId() == null){
+            return ResponseEntity.status(400).body(result);
+        }else {
+            return ResponseEntity.ok(result);
+        }
+    }
+
+
 
 }

JPA-SpringBoot/src/main/java/com/jpa/jpaspringboot/entity/User.java

@@ -16,12 +16,9 @@ import javax.persistence.*;
 public class User {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
-    @Column(name = "id")
     private Integer id;
-    @Column(name = "age")
-    private Integer age;
-    @Column(name = "name")
+    private Integer ages;
     private String name;
-    @Column(name = "sex")
     private String sex;
+    private String age;
 }

JPA-SpringBoot/src/main/java/com/jpa/jpaspringboot/service/Impl/UserServiceImpl.java

@@ -3,7 +3,6 @@ package com.jpa.jpaspringboot.service.Impl;
 import com.jpa.jpaspringboot.dao.UserDao;
 import com.jpa.jpaspringboot.entity.User;
 import com.jpa.jpaspringboot.service.UserService;
-import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
 import java.util.List;
@@ -11,8 +10,11 @@ import java.util.List;
 @Service
 public class UserServiceImpl implements UserService {
 
-    @Autowired
-    private UserDao userDao;
+    private final UserDao userDao;
+
+    public UserServiceImpl(UserDao userDao) {
+        this.userDao = userDao;
+    }
 
 
     @Override
@@ -21,12 +23,22 @@ public class UserServiceImpl implements UserService {
     }
 
     @Override
-    public void add() {
-        User user = new User();
-        user.setSex("男");
-        user.setName("436");
-        user.setId(12);
-        user.setName("哈哈哈");
+    public User insert(User user) {
+        return userDao.save(user);
+    }
+
+    @Override
+    public User delete(User user) {
+        userDao.deleteById(user.getId());
+        return user;
+    }
+
+    @Override
+    public User update(User user) {
+        userDao.findById(user.getId());
         userDao.save(user);
+        return user;
     }
+
+
 }

JPA-SpringBoot/src/main/java/com/jpa/jpaspringboot/service/UserService.java

@@ -7,5 +7,9 @@ import java.util.List;
 public interface UserService {
     List<User> find();
 
-    void add();
+    User insert(User user);
+
+    User delete(User user);
+
+    User update(User user);
 }

JPA-SpringBoot/src/main/java/com/jpa/jpaspringboot/utils/JpaUtils.java

-package com.jpa.jpaspringboot.utils;
-
-public class JpaUtils {
-
-}

README.md

@@ -8,6 +8,7 @@
 ## 为什么要使用Git
 
 __首先Git的核心: HEAD指针，分支__  
+
  - 免费开源的分布式版本控制系统
  - 具有廉价的本地库
  - 方便的暂存区