更换数据库连接为JPA，添加数据库认证信息。

更新了一些示例，位于authentication包中。
精简了maven依赖

pom.xml

@@ -46,6 +46,10 @@
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-jdbc</artifactId>
 		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-data-jpa</artifactId>
+		</dependency>
 <!--		<dependency>-->
 <!--			<groupId>org.springframework.boot</groupId>-->
 <!--			<artifactId>spring-boot-starter-security</artifactId>-->
@@ -58,11 +62,11 @@
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-web-services</artifactId>
 		</dependency>
-		<dependency>
-			<groupId>org.mybatis.spring.boot</groupId>
-			<artifactId>mybatis-spring-boot-starter</artifactId>
-			<version>3.0.3</version>
-		</dependency>
+<!--		<dependency>-->
+<!--			<groupId>org.mybatis.spring.boot</groupId>-->
+<!--			<artifactId>mybatis-spring-boot-starter</artifactId>-->
+<!--			<version>3.0.3</version>-->
+<!--		</dependency>-->
 		<dependency>
 			<groupId>org.springframework.session</groupId>
 			<artifactId>spring-session-jdbc</artifactId>
@@ -74,11 +78,11 @@
 			<scope>runtime</scope>
 			<optional>true</optional>
 		</dependency>
-		<dependency>
-			<groupId>com.h2database</groupId>
-			<artifactId>h2</artifactId>
-			<scope>runtime</scope>
-		</dependency>
+<!--		<dependency>-->
+<!--			<groupId>com.h2database</groupId>-->
+<!--			<artifactId>h2</artifactId>-->
+<!--			<scope>runtime</scope>-->
+<!--		</dependency>-->
 		<dependency>
 			<groupId>com.mysql</groupId>
 			<artifactId>mysql-connector-j</artifactId>

src/main/java/org/cmh/backend/authentication/controller/UserController.java

@@ -0,0 +1,23 @@
+package org.cmh.backend.authentication.controller;
+
+import org.cmh.backend.authentication.model.User;
+import org.cmh.backend.authentication.service.UserService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/users")
+public class UserController {
+    @Autowired
+    private UserService userService;
+
+    @GetMapping("/{username}")
+    public ResponseEntity<User> getUser(@PathVariable String username) {
+        User user = userService.getUserByUsername(username);
+        return ResponseEntity.ok(user);
+    }
+}

src/main/java/org/cmh/backend/authentication/model/User.java

@@ -0,0 +1,39 @@
+package org.cmh.backend.authentication.model;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+
+@Entity
+public class User {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+    private String username;
+    private String password;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+}

src/main/java/org/cmh/backend/authentication/repository/UserRepository.java

@@ -0,0 +1,8 @@
+package org.cmh.backend.authentication.repository;
+
+import org.cmh.backend.authentication.model.User;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface UserRepository extends JpaRepository<User, Long> {
+    User findByUsername(String username);
+}

src/main/java/org/cmh/backend/authentication/service/UserService.java

@@ -0,0 +1,16 @@
+package org.cmh.backend.authentication.service;
+
+import org.cmh.backend.authentication.model.User;
+import org.cmh.backend.authentication.repository.UserRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class UserService {
+    @Autowired
+    private UserRepository userRepository;
+
+    public User getUserByUsername(String username) {
+        return userRepository.findByUsername(username);
+    }
+}

src/main/resources/application.properties

@@ -1 +1,24 @@
 spring.application.name=backend
+server.port=8080
+spring.datasource.url=jdbc:mysql://ecs1.heshunme.xyz:3306/cmh
+spring.datasource.username=neu
+spring.datasource.password=5rWL55uf5rGH5a6e6K6t5bCP57uE
+spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
+# JPA settings
+spring.jpa.hibernate.ddl-auto=update
+spring.jpa.show-sql=true
+spring.jpa.properties.hibernate.format_sql=true
+spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL8Dialect
+# Data source pool properties
+spring.datasource.hikari.maximum-pool-size=10
+spring.datasource.hikari.minimum-idle=5
+spring.datasource.hikari.idle-timeout=30000
+spring.datasource.hikari.pool-name=SpringBootHikariCP
+spring.datasource.hikari.max-lifetime=2000000
+spring.datasource.hikari.connection-timeout=30000
+# Servlet
+server.servlet.encoding.enabled=true
+server.servlet.encoding.force=true
+server.servlet.encoding.charset=utf-8
+
+