SpringBoot在线博客系统

码神之路网站所使用的博客，项目简单，需求明确，容易上手，非常适合做为练手级项目。

blog.mszlu.com

项目讲解说明：

提供前端工程，只需要实现后端接口即可项目以单体架构入手，先快速开发，不考虑项目优化，降低开发负担开发完成后，开始优化项目，提升编程思维能力比如页面静态化，缓存，云存储，日志等docker部署上线云服务器购买，域名购买，域名备案等

项目使用技术 ：

springboot + mybatisplus+redis+mysql

前端的工程：

npm install
npm run build
npm run dev

导入依赖

    4.0.0

    com.mszlu
    blog-parent
    1.0-SNAPSHOT


    
        org.springframework.boot
        spring-boot-starter-parent
        2.5.0
        
    

    
        UTF-8
        UTF-8
        1.8
    

    

        
            org.springframework.boot
            spring-boot-starter
            
            
                
                    org.springframework.boot
                    spring-boot-starter-logging
                
            
        

        
        
            org.springframework.boot
            spring-boot-starter-log4j2
        

        
            org.springframework.boot
            spring-boot-starter-aop
        

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

        
            org.springframework.boot
            spring-boot-starter-test
            test
        

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


        
            com.alibaba
            fastjson
            1.2.76
        

        
            mysql
            mysql-connector-java
        

        
            org.springframework.boot
            spring-boot-configuration-processor
            true
        

        
            org.apache.commons
            commons-lang3
        

        
            commons-collections
            commons-collections
            3.2.2
        

        
            com.baomidou
            mybatis-plus-boot-starter
            3.4.3
        
        
            org.projectlombok
            lombok
        
        
        
            joda-time
            joda-time
            2.10.10
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

在application.properties配置文件中配置数据库和Mybatisplus的配置

#server
server.port= 8888
spring.application.name=mszlu_blog
# datasource
spring.datasource.url=jdbc:mysql://localhost:3306/blog?useUnicode=true&characterEncoding=UTF-8&serverTimeZone=UTC
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

#mybatis-plus
mybatis-plus.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl
mybatis-plus.global-config.db-config.table-prefix=ms_

创建config包，在包下面创建MybatisPlusConfig类

@Configuration
//扫包，将此包下的接口生成代理实现类，并且注册到spring容器中
@MapperScan("com.mszlu.blog.dao")
public class MybatisPlusConfig {
	//分页插件
    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor(){
        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
        interceptor.addInnerInterceptor(new PaginationInnerInterceptor());
        return interceptor;
    }
}

同样在config包下创建WebConfig类实现WebMvcConfigurer 接口，进行跨域配置

@Configuration
public class WebConfig  implements WebMvcConfigurer {

    @Override
    public void addCorsMappings(CorsRegistry registry) {
        //跨域配置，不可设置为*，不安全, 前后端分离项目，可能域名不一致
        //本地测试 端口不一致 也算跨域
        registry.addMapping("
    private Long authorId;
    
    private Long bodyId;
    
    private Long categoryId;

    
    private int weight = Article_Common;


    
    private Long createDate;
}

创建作者的实体类

package com.mszlu.blog.dao.pojo;

import lombok.Data;

@Data
public class SysUser {

    private Long id;

    private String account;

    private Integer admin;

    private String avatar;

    private Long createDate;

    private Integer deleted;

    private String email;

    private Long lastLogin;

    private String mobilePhoneNumber;

    private String nickname;

    private String password;

    private String salt;

    private String status;
}

创建标签的实体类

package com.mszlu.blog.dao.pojo;

import lombok.Data;

@Data
public class Tag {

    private Long id;

    private String avatar;

    private String tagName;

}

//Json数据进行交互
@RestController
@RequestMapping("/articles")
public class ArticleController {

    @Autowired
    private ArticleService articleService;
    
    @PostMapping
    public result listArticle(@RequestBody PageParams pageParams) {
        return articleService.listArticle(pageParams);
    }
}

统一最后的结果

package com.mszlu.blog.vo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class result {
    private boolean success;

    private int code;

    private String msg;

    private Object data;

    public static result success(Object data){
        return new result(true,200,"success",data);
    }

    public static result fail(int code,String msg){
        return new result(false,code,msg,null);
    }


}

创建ArticleVo用于前端数据展示

@Data
public class ArticleVo {

    private Long id;

    private String title;

    private String summary;

    private int commentCounts;

    private int viewCounts;

    private int weight;
    
    private String createDate;

    private String author;

    private ArticleBodyVo body;

    private List tags;

    private List categorys;

}

建立文章的业务层接口

public interface ArticleService {
    
    result listArticle(PageParams pageParams);

}

创建ArticleServiceImpl类实现service业务层接口

@Service
public class ArticleServiceImpl implements ArticleService {

    @Autowired
    private ArticleMapper articleMapper;
    @Autowired
    private TagService tagService;
    @Autowired
    private SysUserService sysUserService;

    @Override
    public result listArticle(PageParams pageParams) {
        
        Page
 page = new Page<>(pageParams.getPage(),pageParams.getPageSize());
        LambdaQueryWrapper
 queryWrapper = new LambdaQueryWrapper<>();
        //是否置顶
        //order by creat_time
        queryWrapper.orderByDesc(Article::getWeight,Article::getCreateDate);
        Page
 articlePage = articleMapper.selectPage(page, queryWrapper);
        List
 records = articlePage.getRecords();
        //不能直接返回
        List articleVoList = copyList(records,true,true);
        return result.success(articleVoList);
    }

    private List copyList(List
 records,boolean isTag,boolean isAuthor) {
        List articleVoList = new ArrayList<>();
        for (Article record : records) {
            articleVoList.add(copy(record,isTag,isAuthor));
        }
        return articleVoList;
    }

    //把文章的字段数据传递给copy用于前端展示
    private ArticleVo copy(Article article,boolean isTag,boolean isAuthor){
        ArticleVo articleVo = new ArticleVo();
        //进行对象之间属性的赋值
        BeanUtils.copyProperties(article,articleVo);

        articleVo.setCreateDate(new DateTime(article.getCreateDate()).toString("yyyy-mm-dd HH:mm"));
        //并不是所有的接口都需要标签，作者信息
        if(isTag){
            Long articleId = article.getId();
            List tagVos = tagService.findTagByArticleId(articleId);
            articleVo.setTags(tagVos);
        }
        if(isAuthor){
            Long authorId = article.getAuthorId();
            SysUser user = sysUserService.findUserById(authorId);
            articleVo.setAuthor(user.getNickname());
        }
        return articleVo;
    }
}

创建用户的业务层接口

public interface SysUserService {

    SysUser findUserById(Long id);
}

实现作者的业务层接口

@Service
public class SysUserServiceImpl implements SysUserService {

    @Autowired
    private SysUserMapper sysUserMapper;

    @Override
    public SysUser findUserById(Long id) {
        SysUser sysUser = sysUserMapper.selectById(id);
        //判断查询sysUser对象是否为空，如果为空则给昵称复制，避免空指针异常
        if(sysUser == null){
            sysUser = new SysUser();
            sysUser.setNickname("码神之路");
        }
        return sysUser;
    }
}

创建标签的业务层接口

public interface TagsService {


    List findTagsByArticleId(Long id);
}

实现标签的业务层接口

@Service
public class TagsServiceImpl implements TagsService {
    @Autowired
    private TagMapper tagMapper;

    public TagVo copy(Tag tag){
        TagVo tagVo = new TagVo();
        BeanUtils.copyProperties(tag,tagVo);
        return tagVo;
    }
    public List copyList(List tagList){
        List tagVoList = new ArrayList<>();
        for (Tag tag : tagList) {
            tagVoList.add(copy(tag));
        }
        return tagVoList;
    }

    @Override
    public List findTagByArticleId(Long articleId) {
        //myBatisPlus无法进行多表查询
        List tags = tagMapper.findTagsByArticleId(articleId);
        return copyList(tags);
    }
}

文章的持久层接口

public interface ArticleMapper extends baseMapper
 {
	
}

标签的持久层接口

public interface TagMapper extends baseMapper {

    List findTagsByArticleId(Long articleId);
}

作者的持久层接口

public interface SysUserMapper extends baseMapper {
}

总的xml文件如下所示

    
        id,avatar,tag_name as tagName
    

    
        select   from ms_tag
        
            id in
            (select tag_id from ms_article_tag where article_id = #{articleId})
        
    

 
2.2.5 测试 
 
3. 首页-最热标签 
3.1 接口说明 
接口url：/tags/hot
 
请求方式：GET
 
请求参数：无
 
返回数据：
 
{
    "success": true,
    "code": 200,
    "msg": "success",
    "data": [
        {
            "id":1,
            "tagName":"4444"
        }
    ]
}
 
3.2 编码 
3.2.1 Controller 
先编写标签的业务层
 
@RestController
@RequestMapping("/tags")
public class TagController {

    @Autowired
    private TagService tagService;

    @GetMapping("/hot")
    private result hot(){
        int limit = 6;
        return tagService.hots(limit);
    }

}

 
标签与前端交互的Vo
 
package com.mszlu.blog.vo;

import lombok.Data;

@Data
public class TagVo {

    private Long id;

    private String tagName;
}

 
3.2.2 Service 
最热标签功能的业务层接口
 
public interface TagsService {

    List hot(int limit);

}

 
业务层接口的实现
 
	@Override
    public result hots(int limit) {
        
        List tagIds = tagMapper.findHotsTagByIds(limit);
        if(CollectionUtils.isEmpty(tagIds)){
            return result.success(Collections.emptyList());
        }
        //需求的是 tagId 和 tagName Tag对象
        //select * from tag where id in (1,2,3) 所以要判断tagIds是否为空
        List tagList = tagMapper.findTagsByTagsId(tagIds);
        return result.success(tagList);
    }

 
3.2.3 Dao 
持久层接口的编写
 
public interface TagMapper extends baseMapper {

    
    List findHotsTagByIds(int limit);


    
    List findTagsByTagsId(List tagIds);
}

 
标签持久层接口对应的xml文件
 






    
        id,avatar,tag_name as tagName
    
    
        select   from ms_tag where id in
        
            #{tagId}
        
    
    
        select tag_id from ms_article_tag at group by tag_id order by count(1) desc limit #{size}