1.创建项目
@SpringBootApplication
public class App
{
public static void main( String[] args )
{
SpringApplication.run(App.class,args);
}
}2.引入依赖
4.0.0
org.springframework.boot
spring-boot-starter-parent
3.1.3
com.ivan.cn
shizhang01
1.0-SNAPSHOT
jar
shizhang01
http://maven.apache.org
UTF-8
org.springframework.boot
spring-boot-starter-web
org.mybatis.spring.boot
mybatis-spring-boot-starter
3.0.0
com.mysql
mysql-connector-j
org.projectlombok
lombok
org.springframework.boot
spring-boot-starter-validation
3.创建目录
controller
exception
pojo
mapper
service
impl
utils
4.数据库设置
spring:
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/big_event
username: root
password: root
create database big_event;
use big_event;
create table user
(
id int unsigned primary key auto_increment comment 'ID',
username varchar(20) not null unique comment '用户名',
password varchar(32) comment '密码',
nickname varchar(10) default '' comment '昵称',
email varchar(128) default '' comment '邮箱',
user_pic varchar(128) default '' comment '头像',
create_time datetime not null comment '创建时间',
update_time datetime not null comment '修改时间'
) ENGINE=InnoDB DEFAULT charset=utf8 comment '用户表';
create table category
(
id int unsigned primary key auto_increment comment 'ID',
category_name varchar(32) not null comment '分类名称',
category_alias varchar(32) comment '分类别名',
create_time datetime not null comment '创建时间',
update_time datetime not null comment '修改时间',
user_id int unsigned default null,
key fk_category_user(user_id),
constraint fk_category_user foreign key (user_id) references user (id)
)ENGINE=InnoDB DEFAULT charset=utf8 comment '分类表';
# alter table category engine=innodb;
create table article
(
id int unsigned primary key auto_increment comment 'ID',
title varchar(30) not null comment '文章标题',
content varchar(10000) not null comment '文章内容',
cover_img varchar(128) not null comment '文章封面',
state varchar(3) default '草稿' comment '文章状态已发布，草稿',
category_id int unsigned comment '文章分类id',
create_user int unsigned not null comment '创建人id',
create_time datetime not null comment '创建时间',
update_time datetime not null comment '修改时间',
cate_id int unsigned default null,
key fk_article_category(cate_id),
user_id int unsigned default null,
key fk_article_user(user_id),
constraint fk_article_category foreign key (cate_id) references category (id),
constraint fk_article_user foreign key (user_id) references user (id)
)ENGINE=InnoDB DEFAULT charset=utf8 comment '文章表'; 5.业务代码编写
//1.实体类
@Data
public class User {
private Integer id;
private String username;
private String password;
private String nickname;
private String email;
private String userPic;
private LocalDateTime createTime;
private LocalDateTime updateTime;
}
@NoArgsConstructor
@AllArgsConstructor
@Data
public class Result {
private Integer code;
private String message;
private T data;
public static Result success(E data){
return new Result<>(0,"操作成功",data);
}
public static Result success(){
return new Result(0,"操作成功",null);
}
public static Result error(String message){
return new Result(1,message,null);
}
}
//2.controller
@RestController
@RequestMapping("/user")
@Validated
public class UserController {
@Autowired
private UserService userService;
@PostMapping("/register")
public Result register(@Pattern(regexp = "^\\S{5,16}$") String username,
@Pattern(regexp = "^\\S{5,16}$") String password){
User user=userService.findByUserName(username);
if(user==null){
userService.register(username,password);
return Result.success();
}else{
return Result.error("用户名已被占用");
}
}
}
//3.service
public interface UserService {
User findByUserName(String username);
void register(String username, String password);
}
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserMapper userMapper;
@Override
public User findByUserName(String username) {
User u=userMapper.findByUserName(username);
return u;
}
@Override
public void register(String username, String password) {
String s = Md5Utils.encrypt3ToMd5(password);
userMapper.register(username,s);
}
}
//4.mapper
@Mapper
public interface UserMapper {
@Insert("insert into user(username,password,create_time,update_time)" +
" values(#{username},#{password},now(),now())")
void register(String username, String password);
@Select("select * from user where username=#{username}")
User findByUserName(String username);
}
//5.异常处理
@RestControllerAdvice
public class GlobalExceptionHandler {
@ExceptionHandler(Exception.class)
public Result handleException(Exception e){
e.printStackTrace();
return Result.error(StringUtils.hasLength(e.getMessage())?e.getMessage():"操作失败");
}
}
//6.工具类
public class Md5Utils {
public static String encrypt3ToMd5(String str) {
return org.springframework.util.DigestUtils.md5DigestAsHex(str.getBytes(StandardCharsets.UTF_8));
}
}