整合Spring Data JPA
1. 创建Maven工程
cnn-info(打jar包)，在pom.xml中进行如下配置
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.4.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>1.4.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<version>1.4.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
<version>1.4.4.RELEASE</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
</dependencies>
2. 加入Spring-Boot配置文件
在src/main/resources 下添加application.properties 配置文件，内容如下：
#DB Configuration:
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test
spring.datasource.username=root
spring.datasource.password=root
#JPA Configuration:
spring.jpa.database=MySQL
spring.jpa.show-sql=true
spring.jpa.generate-ddl=true
spring.jpa.hibernate.ddl-auto=update
spring.jpa.hibernate.naming_strategy=org.hibernate.cfg.ImprovedNamingStrategy
3. 创建实体类
import javax.persistence.Entity;
import javax.persistence.Id;
@Entity
public class User {
@Id
private Long id;
private String userName;
private String password;
private String name;
//添加 get 和set 方法
}
4. 创建DAO接口
import org.springframework.data.jpa.repository.JpaRepository;
import cn.cnn.info.pojo.User;
public interface UserDao extends JpaRepository<User, Long> {
}
5. 创建业务逻辑接口
import java.util.List;
import cn.cnn.info.pojo.User;
public interface UserService {
List<User> findAll();
}
6. 创建业务逻辑实现类
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import cn.cnn.info.dao.UserDao;
import cn.cnn.info.pojo.User;
import cn.cnn.info.service.UserService;
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserDao userDao;
@Override
public List<User> findAll() {
List<User> list = this.userDao.findAll();
return list;
}
}
7. 创建Controller
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import cn.cnn.info.pojo.User;
import cn.cnn.info.service.UserService;
@RestController
@RequestMapping("user")
public class UserControlelr {
@Autowired
private UserService userService;
@RequestMapping("list")
public List<User> queryUserAll() {
List<User> list = this.userService.findAll();
return list;
}
}
8 创建引导类
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
