旨在熟悉springboot项目简单得从0-1的过程

从spring initializr 中创建springboot项目

从spring initializr 中创建springboot项目，也可以从http://start.spring.io/ 网站创建再导入，这里主要讲从initializr创建项目

initializr

创建项目结构

project structure

引入web dependency

        
            org.springframework.boot
            spring-boot-starter-web

数据操作，引入jpa和mysql

        
            org.springframework.boot
            spring-boot-starter-data-jpa
        

        
        
            mysql
            mysql-connector-java

在application.properties中配置数据库信息

# db connection information start
server.port=8080
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test
spring.datasource.username=root
spring.datasource.password=Abcd1234
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.database=MYSQL
spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=update
# db connection information end

创建user entity作为测试

@Entity
    public class User implements Serializable {
    
        private static final long serialVersionUID = 1L;
    
        @Id
        @Column(name="id")
        private long id;
    
        @Column(name="username", unique = true)
        private String username;
    
        @Column(name="password")
        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;
        }
    
        @Override
        public String toString() {
            return "User{" +
                    "id=" + id +
                    ", username='" + username + '\'' +
                    ", password='" + password + '\'' +
                    '}';
        }
    }

设计dao进行数据操作

public interface UserDao extends JpaRepository {
    User findUserByUsername(String username);
}

编写服务类

@Component
public class UserService {

    @Autowired
    private UserDao userDao;

    public User getUserByUsername(String username) {
        return userDao.findUserByUsername(username);
    }
}

编写controller实现请求

@RestController
@RequestMapping("/user")
public class UserController {

    @Autowired
    private UserService userService;

    @RequestMapping("/{username}")
    public User findUserByUsername(@PathVariable String username) {
       return this.userService.getUserByUsername(username);
    }
}

引入thymeleaf来进行页面显示

        
        
            org.springframework.boot
            spring-boot-starter-thymeleaf

并且需要在application.properties 中配置如下信息

# thymeleaf start
spring.thymeleaf.prefix=classpath:/templates/
spring.thymeleaf.suffix=.html
# thymeleaf end

如上过程完成，一个简单的springboot 数据库交互和页面显示的helloworld就出来了
代码已经上传到github
https://github.com/lishang08/spring-boot/tree/master/helloworld

SpringBoot - HelloWorld