add:增加 JPA 案例

Author: chachae

.gitignore

@@ -3,6 +3,4 @@
 *.iml
 out
 gen
-SE/io/
-spring/src/test/
-spring/target/
+*/target

pom.xml

@@ -18,17 +18,18 @@
     <modules>
         <module>spring-boot-mybatis-plus</module>
         <module>java-api</module>
+        <module>spring-boot-jpa</module>
     </modules>
 
+    <!-- 依赖版本管理 -->
     <properties>
-        <junit.version>4.12</junit.version>
-        <slf4j.version>1.7.26</slf4j.version>
         <mysql.version>5.1.48</mysql.version>
         <guava.version>28.1-jre</guava.version>
-        <hutool.version>5.0.7</hutool.version>
+        <hutool.version>5.1.0</hutool.version>
         <hibernate.validator.version>6.1.0.Final</hibernate.validator.version>
     </properties>
 
+    <!-- 统一依赖管理 -->
     <dependencyManagement>
         <dependencies>
             <dependency>
@@ -75,7 +76,13 @@
         </dependencies>
     </dependencyManagement>
 
+    <!-- 父工程默认依赖 -->
     <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-configuration-processor</artifactId>
@@ -94,16 +101,6 @@
             </exclusions>
         </dependency>
 
-        <dependency>
-            <groupId>org.slf4j</groupId>
-            <artifactId>slf4j-api</artifactId>
-        </dependency>
-
-        <dependency>
-            <groupId>org.slf4j</groupId>
-            <artifactId>slf4j-log4j12</artifactId>
-        </dependency>
-
         <dependency>
             <groupId>mysql</groupId>
             <artifactId>mysql-connector-java</artifactId>

spring-boot-jpa/pom.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>JavaStudy</artifactId>
+        <groupId>com.chachae</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>spring-boot-jpa</artifactId>
+
+    <dependencies>
+        <!-- spring-boot-starter-data-jpa -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+        </dependency>
+    </dependencies>
+</project>

spring-boot-jpa/src/main/java/com/chachae/JpaApplication.java

@@ -0,0 +1,16 @@
+package com.chachae;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+/**
+ * @author chachae
+ * @since 2020/1/7 22:54
+ */
+@SpringBootApplication
+public class JpaApplication {
+
+  public static void main(String[] args) {
+    SpringApplication.run(JpaApplication.class);
+  }
+}

spring-boot-jpa/src/main/java/com/chachae/controller/UserController.java

@@ -0,0 +1,50 @@
+package com.chachae.controller;
+
+import com.chachae.entity.User;
+import com.chachae.service.UserService;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import javax.annotation.Resource;
+import java.util.List;
+
+/**
+ * @author chachae
+ * @since 2020/1/7 23:15
+ */
+@RestController
+@RequestMapping("/user")
+public class UserController {
+
+  @Resource private UserService userService;
+
+  @GetMapping("/list")
+  public ResponseEntity<List<User>> listAll() {
+    List<User> users = this.userService.listAll();
+    return ResponseEntity.ok(users);
+  }
+
+  @GetMapping("/{id}")
+  public ResponseEntity<User> listAll(@PathVariable Long id) {
+    User user = this.userService.getUserById(id);
+    return ResponseEntity.ok(user);
+  }
+
+  @PostMapping("/save")
+  public ResponseEntity<Long> saveUser(User user) {
+    Long id = this.userService.insert(user);
+    return ResponseEntity.ok(id);
+  }
+
+  @DeleteMapping("/delete/{id}")
+  public ResponseEntity<Long> saveUser(@PathVariable Long id) {
+    id = this.userService.remove(id);
+    return ResponseEntity.ok(id);
+  }
+
+  @PutMapping("/update")
+  public ResponseEntity<Long> updateUser(User user) {
+    Long id = this.userService.update(user);
+    return ResponseEntity.ok(id);
+  }
+}

spring-boot-jpa/src/main/java/com/chachae/entity/User.java

@@ -0,0 +1,28 @@
+package com.chachae.entity;
+
+import lombok.Data;
+
+import javax.persistence.*;
+
+/**
+ * @author chachae
+ * @since 2020/1/7 23:02
+ */
+@Data
+@Entity
+@Table(name = "t_user")
+public class User {
+
+  @Id
+  // 主键生成策略：MYSQL自增ID
+  @GeneratedValue(strategy = GenerationType.IDENTITY)
+  private Long id;
+
+  private String userName;
+
+  private String password;
+
+  private Integer admin;
+
+  private Integer status;
+}

spring-boot-jpa/src/main/java/com/chachae/exceptions/GlobalExceptionHandler.java

@@ -0,0 +1,51 @@
+package com.chachae.exceptions;
+
+import com.google.common.collect.Maps;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+import javax.servlet.http.HttpServletRequest;
+import java.util.Map;
+
+/**
+ * 全局异常处理
+ *
+ * @author chachae
+ * @since 2020/1/7 23:29
+ */
+@RestControllerAdvice
+public class GlobalExceptionHandler {
+
+  private Map<String, Object> resMap = Maps.newHashMap();
+
+  /**
+   * 处理运行时异常
+   *
+   * @param e 异常
+   * @param request 前台请求
+   * @return 返回异常信息
+   */
+  @ExceptionHandler(RuntimeException.class)
+  public ResponseEntity<Map<String, Object>> handlerRuntimeException(
+      RuntimeException e, HttpServletRequest request) {
+    resMap.put("msg", e.getMessage());
+    resMap.put("url", request.getRequestURI());
+    return ResponseEntity.ok(resMap);
+  }
+
+  /**
+   * 处理Exception 异常
+   *
+   * @param e 异常
+   * @param request 前台请求
+   * @return 返回异常信息
+   */
+  @ExceptionHandler(Exception.class)
+  public ResponseEntity<Map<String, Object>> handlerException(
+      Exception e, HttpServletRequest request) {
+    resMap.put("msg", e.getMessage());
+    resMap.put("url", request.getRequestURI());
+    return ResponseEntity.ok(resMap);
+  }
+}

spring-boot-jpa/src/main/java/com/chachae/repository/UserDAO.java

@@ -0,0 +1,12 @@
+package com.chachae.repository;
+
+import com.chachae.entity.User;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+/**
+ * @author chachae
+ * @since 2020/1/7 23:07
+ */
+@Repository("userDAO")
+public interface UserDAO extends JpaRepository<User, Long> {}

spring-boot-jpa/src/main/java/com/chachae/service/UserService.java

@@ -0,0 +1,33 @@
+package com.chachae.service;
+
+import com.chachae.entity.User;
+
+import java.util.List;
+
+/**
+ * @author chachae
+ * @since 2020/1/7 23:09
+ */
+public interface UserService {
+
+  /**
+   * 查询全部
+   *
+   * @return List<User>
+   */
+  List<User> listAll();
+
+  /**
+   * 通过id 查询成员
+   *
+   * @param id 成员id
+   * @return User
+   */
+  User getUserById(Long id);
+
+  Long insert(User user);
+
+  Long remove(Long id);
+
+  Long update(User user);
+}

spring-boot-jpa/src/main/java/com/chachae/service/impl/UserServiceImpl.java

@@ -0,0 +1,60 @@
+package com.chachae.service.impl;
+
+import cn.hutool.core.util.ObjectUtil;
+import com.chachae.entity.User;
+import com.chachae.repository.UserDAO;
+import com.chachae.service.UserService;
+import org.springframework.stereotype.Service;
+
+import javax.annotation.Resource;
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * @author chachae
+ * @since 2020/1/7 23:10
+ */
+@Service("userService")
+public class UserServiceImpl implements UserService {
+
+  @Resource private UserDAO userDAO;
+
+  @Override
+  public List<User> listAll() {
+    List<User> list = this.userDAO.findAll();
+    if (ObjectUtil.isNotEmpty(list)) {
+      list.forEach(entity -> entity.setPassword(null));
+      return list;
+    }
+    throw new RuntimeException("用户不存在");
+  }
+
+  @Override
+  public User getUserById(Long id) {
+    Optional<User> res = this.userDAO.findById(id);
+    if (res.isPresent()) {
+      User entity = res.get();
+      entity.setPassword(null);
+      return entity;
+    }
+    throw new RuntimeException("用户不存在");
+  }
+
+  @Override
+  public Long insert(User user) {
+    User res = this.userDAO.save(user);
+    return res.getId();
+  }
+
+  @Override
+  public Long remove(Long id) {
+    this.userDAO.deleteById(id);
+    return id;
+  }
+
+  @Override
+  public Long update(User user) {
+    User res = this.userDAO.save(user);
+    return res.getId();
+  }
+}