5. 使用springboot做一个音乐播放器软件项目【业务逻辑开发】

#万物oop

上一章文章我们做了音乐播放器数据表的创建。参加地址：
https://blog.csdn.net/Drug_/article/details/145093705

今天分享的这篇文章就是根据数据表来写业务逻辑。今天我们主要是实现管理后台的功能。
对于这篇文章的理解需要小伙伴有 springboot框架基础。
代码实现起来还是比较简单的，就是常规业务开发的增删改查。

实现需求：
管理后台：
账号管理、专辑管理、作者管理、歌曲管理

一：账号管理

在这里插入图片描述
后端代码如下：

因为代码内容过多
对于接口类和实体类我就不分享了
实体类里的对应的就是数据表里的字段因为我们是用实体类接参数，所以需要根据数据表一一创建实体类
直接分享的是控制器和实现类
在这里插入图片描述

用户表控制器：

package com.music.base.controller;


import com.music.base.aop.noLogin.NoLogin;
import com.music.base.entities.MuUser;
import com.music.base.out.R;
import com.music.base.request.BaseRequest;
import com.music.base.service.inteface.IMuUserService;
import com.music.base.webFilterIntercept.LoginUserInfo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;


/**
 * <p>
 * 账号表 前端控制器
 * </p>
 *
 * @author Json
 * @since 2024-12-22
 */
@RestController
@RequestMapping("/mu-user")
public class MuUserController extends BaseController {

    @Autowired
    IMuUserService userService;

    //注册
    @PostMapping("register")
    public R register(@RequestBody MuUser muUser){
        return userService.register(muUser);
    }

    //删除
    @GetMapping("del")
    public R del(Integer id){
        return userService.del(id);
    }

    //登录
    @PostMapping("login")
    @NoLogin
    public R login(@RequestBody MuUser muUser){
        return userService.login(muUser);
    }

    //列表
    @GetMapping("pageList")
    public R pageList(BaseRequest baseRequest){
        return userService.pageList(baseRequest);
    }

    //当前登陆人信息
    @GetMapping("getUserInfo")
    public R getUserInfo(){
        return R.data(userService.getById(LoginUserInfo.getLoginUserId()));
    }

}

用户表实现类

package com.music.base.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.music.base.entities.MuUser;
import com.music.base.mapper.MuUserMapper;
import com.music.base.out.R;
import com.music.base.request.BaseRequest;
import com.music.base.service.inteface.IMuUserService;
import com.music.base.utils.JwtHelper;
import com.music.base.utils.MD5;
import org.springframework.stereotype.Service;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;

/**
 * <p>
 * 账号表 服务实现类
 * </p>
 *
 * @author Json
 * @since 2024-12-22
 */
@Service
public class MuUserServiceImpl extends ServiceImpl<MuUserMapper, MuUser> implements IMuUserService {

    @Override
    public R register(MuUser muUser) {
        if(StringUtils.isEmpty(muUser.getUsername()) || StringUtils.isEmpty(muUser.getPassword())){
            return R.fail("账号密码不能为空！");
        }
        if(StringUtils.isEmpty(muUser.getNickname()) ){
            return R.fail("用户昵称不能为空！");
        }
        long count=count(new QueryWrapper<MuUser>().lambda().eq(MuUser::getUsername, muUser.getUsername()));
        if(count>0){
            return R.fail("账号已存在！");
        }
        muUser.setPassword(MD5.encoder(muUser.getPassword()));
        save(muUser);
        return R.success();
    }

    @Override
    public R login(MuUser muUser) {
        if(StringUtils.isEmpty(muUser.getUsername()) || StringUtils.isEmpty(muUser.getPassword())){
            return R.fail("账号密码不能为空！");
        }
        MuUser one = getOne(new QueryWrapper<MuUser>().lambda().eq(MuUser::getUsername, muUser.getUsername()));
        if(ObjectUtils.isEmpty(one)){
            return R.fail("账号不存在");
        }
        if(!one.getPassword().equals(MD5.encoder(muUser.getPassword()))){
            return R.fail("密码不正确！");
        }
       String token =  JwtHelper.sign(one.getId());
        return R.data(token);
    }

    @Override
    public R pageList(BaseRequest request) {
        Page<MuUser> page = new Page<>(request.getPage() == null ? 1 : request.getPage(), request.getPageSize() == null ? 10 : request.getPageSize());
        QueryWrapper<MuUser> queryWrapper = new QueryWrapper<>();
        page(page, queryWrapper.lambda().orderByDesc(MuUser::getId));
        return R.data(page);
    }

    @Override
    public R del(Integer id) {
        MuUser byId = getById(id);
        if(ObjectUtils.isEmpty(byId)){
            return R.fail("未查询到用户，删除失败！");
        }
        if(byId.getIsSuper().equals(1)){
            return R.fail("内置管理员，不能删除");
        }
        removeById(id);
        return R.success();
    }
}

二.专辑管理

专辑控制器

package com.music.base.controller;


import com.music.base.entities.MuAlbum;
import com.music.base.out.R;
import com.music.base.request.BaseRequest;
import com.music.base.service.inteface.IMuAlbumService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;


/**
 * <p>
 * 专辑表 前端控制器
 * </p>
 *
 * @author Json
 * @since 2024-12-22
 */
@RestController
@RequestMapping("/mu-album")
public class MuAlbumController extends BaseController {
    @Autowired
    IMuAlbumService iMuAlbumService;

    //列表
    @GetMapping("pageList")
    public R pageList(BaseRequest baseRequest){
        return iMuAlbumService.pageList(baseRequest);
    }

    //添加
    @PostMapping("add")
    public R add(@RequestBody MuAlbum muAlbum){
        return iMuAlbumService.add(muAlbum);
    }

    //删除
    @GetMapping("del")
    public R del(Integer id){
        return iMuAlbumService.del(id);
    }
}

专辑实现类

package com.music.base.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.music.base.entities.MuAlbum;
import com.music.base.entities.MuSong;
import com.music.base.mapper.MuAlbumMapper;
import com.music.base.out.R;
import com.music.base.request.BaseRequest;
import com.music.base.service.inteface.IMuAlbumService;
import com.music.base.service.inteface.IMuSongService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

/**
 * <p>
 * 专辑表 服务实现类
 * </p>
 *
 * @author Json
 * @since 2024-12-22
 */
@Service
public class MuAlbumServiceImpl extends ServiceImpl<MuAlbumMapper, MuAlbum> implements IMuAlbumService {

    @Autowired
    private IMuSongService iMuSongService;

    @Override
    public R pageList(BaseRequest request) {
        Page<MuAlbum> page = new Page<>(request.getPage() == null ? 1 : request.getPage(), request.getPageSize() == null ? 10 : request.getPageSize());
        QueryWrapper<MuAlbum> queryWrapper = new QueryWrapper<>();
        page(page, queryWrapper.lambda().orderByDesc(MuAlbum::getId));
        if(!page.getRecords().isEmpty()){
            page.getRecords().forEach(muAlbum -> {
                Long count= iMuSongService.count(new QueryWrapper<MuSong>().lambda().eq(MuSong::getAlbumId, muAlbum.getId()));
                muAlbum.setAlbumSongCount(count);
            });
        }
        return R.data(page);
    }

    @Override
    public R add(MuAlbum muAlbum) {
        if(StringUtils.isEmpty(muAlbum.getAlbumName())){
            return R.fail("作者名称不能为空！");
        }
        long count=count(new QueryWrapper<MuAlbum>().lambda().eq(MuAlbum::getAlbumName, muAlbum.getAlbumName().trim()));
        if(count>0){
            return R.fail("作者名称已存在！");
        }
        muAlbum.setAlbumName( muAlbum.getAlbumName().trim());
        save(muAlbum);
        return R.success();
    }

    @Override
    public R del(Integer id) {
        removeById(id);
        return R.success();
    }
}

三.作者管理

在这里插入图片描述
作者表控制器

package com.music.base.controller;


import com.music.base.entities.MuAuthor;
import com.music.base.out.R;
import com.music.base.request.BaseRequest;
import com.music.base.service.inteface.IMuAuthorService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;


/**
 * <p>
 * 作者表 前端控制器
 * </p>
 *
 * @author Json
 * @since 2024-12-22
 */
@RestController
@RequestMapping("/mu-author")
public class MuAuthorController extends BaseController {

    @Autowired
    IMuAuthorService iMuAuthorService;

    //列表
    @GetMapping("pageList")
    public R pageList(BaseRequest baseRequest){
        return iMuAuthorService.pageList(baseRequest);
    }

    //添加
    @PostMapping("add")
    public R add(@RequestBody MuAuthor muAuthor){
        return iMuAuthorService.add(muAuthor);
    }

    //删除
    @GetMapping("del")
    public R del(Integer id){
        return iMuAuthorService.del(id);
    }

}

作者表实现类

package com.music.base.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.music.base.entities.MuAuthor;
import com.music.base.entities.MuSong;
import com.music.base.mapper.MuAuthorMapper;
import com.music.base.out.R;
import com.music.base.request.BaseRequest;
import com.music.base.service.inteface.IMuAuthorService;
import com.music.base.service.inteface.IMuSongService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

/**
 * <p>
 * 作者表 服务实现类
 * </p>
 *
 * @author Json
 * @since 2024-12-22
 */
@Service
public class MuAuthorServiceImpl extends ServiceImpl<MuAuthorMapper, MuAuthor> implements IMuAuthorService {

    @Autowired
    private IMuSongService iMuSongService;

    @Override
    public R pageList(BaseRequest request) {
        Page<MuAuthor> page = new Page<>(request.getPage() == null ? 1 : request.getPage(), request.getPageSize() == null ? 10 : request.getPageSize());
        QueryWrapper<MuAuthor> queryWrapper = new QueryWrapper<>();
        page(page, queryWrapper.lambda().orderByDesc(MuAuthor::getId));
        if(!page.getRecords().isEmpty()){
            page.getRecords().forEach(muAuthor -> {
               Long count= iMuSongService.count(new QueryWrapper<MuSong>().lambda().eq(MuSong::getAuthorId, muAuthor.getId()));
               muAuthor.setAuthorSongCount(count);
            });
        }
        return R.data(page);
    }

    @Override
    public R add(MuAuthor muAuthor) {
        if(StringUtils.isEmpty(muAuthor.getAuthorName())){
            return R.fail("作者名称不能为空！");
        }
        long count=count(new QueryWrapper<MuAuthor>().lambda().eq(MuAuthor::getAuthorName, muAuthor.getAuthorName().trim()));
        if(count>0){
            return R.fail("作者名称已存在！");
        }
        muAuthor.setAuthorName( muAuthor.getAuthorName().trim());
        save(muAuthor);
        return R.success();
    }

    @Override
    public R del(Integer id) {
        removeById(id);
        return R.success();
    }
}

四.歌曲管理

在这里插入图片描述
歌曲表控制器

package com.music.base.controller;


import com.music.base.entities.MuSong;
import com.music.base.out.R;
import com.music.base.request.MuSongRequest;
import com.music.base.service.inteface.IMuSongService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;


/**
 * <p>
 * 歌曲表 前端控制器
 * </p>
 *
 * @author Json
 * @since 2024-12-22
 */
@RestController
@RequestMapping("/mu-song")
public class MuSongController extends BaseController {

    @Autowired
    IMuSongService iMuSongService;

    //列表
    @GetMapping("pageList")
    public R pageList(MuSongRequest baseRequest){
        return iMuSongService.pageList(baseRequest);
    }

    //添加
    @PostMapping("add")
    public R add(@RequestBody MuSong muSong){
        return iMuSongService.add(muSong);
    }

    //编辑
    @PostMapping("edit")
    public R edit(@RequestBody MuSong muSong){
        return iMuSongService.edit(muSong);
    }

    //删除
    @GetMapping("del")
    public R del(Integer id){
        return iMuSongService.del(id);
    }
}

歌曲表实现类

package com.music.base.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.music.base.entities.MuAlbum;
import com.music.base.entities.MuAuthor;
import com.music.base.entities.MuSong;
import com.music.base.mapper.MuSongMapper;
import com.music.base.out.R;
import com.music.base.request.MuSongRequest;
import com.music.base.service.inteface.IMuAlbumService;
import com.music.base.service.inteface.IMuAuthorService;
import com.music.base.service.inteface.IMuSongService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;

/**
 * <p>
 * 歌曲表 服务实现类
 * </p>
 *
 * @author Json
 * @since 2024-12-22
 */
@Service
public class MuSongServiceImpl extends ServiceImpl<MuSongMapper, MuSong> implements IMuSongService {

    @Autowired
    IMuAlbumService iMuAlbumService;
    @Autowired
    IMuAuthorService iMuAuthorService;


    @Override
    public R pageList(MuSongRequest request) {
        Page<MuSong> page = new Page<>(request.getPage() == null ? 1 : request.getPage(), request.getPageSize() == null ? 10 : request.getPageSize());
        QueryWrapper<MuSong> queryWrapper = new QueryWrapper<>();
        if(!StringUtils.isEmpty(request.getSearch())){
            queryWrapper.lambda().like(MuSong::getSongName, request.getSearch());
        }
        if(request.getAlbumId()!=null){
            queryWrapper.lambda().eq(MuSong::getAlbumId, request.getAlbumId());
        }
        if(request.getAuthorId()!=null){
            queryWrapper.lambda().eq(MuSong::getAuthorId, request.getAuthorId());
        }
        page(page, queryWrapper.lambda().orderByDesc(MuSong::getId));
        return R.data(page);
    }

    @Override
    public R add(MuSong muSong) {
        if(StringUtils.isEmpty(muSong.getSongName())){
            return R.fail("歌曲名称不能为空！");
        }
        if(StringUtils.isEmpty(muSong.getSongUrl())){
            return R.fail("歌曲不能为空！");
        }
        MuAlbum muAlbum = iMuAlbumService.getOne(new QueryWrapper<MuAlbum>().lambda().eq(MuAlbum::getAlbumName, muSong.getAlbumName()));
        if(!ObjectUtils.isEmpty(muAlbum)){
            muSong.setAlbumId(muAlbum.getId());
        }

        MuAuthor muAuthor = iMuAuthorService.getOne(new QueryWrapper<MuAuthor>().lambda().eq(MuAuthor::getAuthorName, muSong.getAuthorName()));
        if(!ObjectUtils.isEmpty(muAuthor)){
            muSong.setAuthorId(muAuthor.getId());
        }

        save(muSong);
        return R.success();
    }

    @Override
    public R del(Integer id) {
        removeById(id);
        return R.success();
    }

    @Override
    public R edit(MuSong muSong) {
        if(StringUtils.isEmpty(muSong.getId())){
            return R.fail("id不能为空！");
        }
        if(StringUtils.isEmpty(muSong.getSongName())){
            return R.fail("歌曲名称不能为空！");
        }
        if(StringUtils.isEmpty(muSong.getSongUrl())){
            return R.fail("歌曲不能为空！");
        }
        MuAlbum muAlbum = iMuAlbumService.getOne(new QueryWrapper<MuAlbum>().lambda().eq(MuAlbum::getAlbumName, muSong.getAlbumName()));
        if(!ObjectUtils.isEmpty(muAlbum)){
            muSong.setAlbumId(muAlbum.getId());
        }

        MuAuthor muAuthor = iMuAuthorService.getOne(new QueryWrapper<MuAuthor>().lambda().eq(MuAuthor::getAuthorName, muSong.getAuthorName()));
        if(!ObjectUtils.isEmpty(muAuthor)){
            muSong.setAuthorId(muAuthor.getId());
        }
        updateById(muSong);
        return R.success();
    }
}

最后再分享一下文件上传的控制器。
因为我们后台是可以上传封面和歌曲的所以需要一个文件上传的控制器。

package com.music.base.controller;


import com.music.base.aop.noLogin.NoLogin;
import com.music.base.out.R;
import com.music.base.utils.UploadHelper;
import lombok.extern.slf4j.Slf4j;
import org.dromara.x.file.storage.core.Downloader;
import org.dromara.x.file.storage.core.FileInfo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;


/**
 * <p>
 * 文件记录表 前端控制器
 * </p>
 *
 * @author Json
 * @since 2024-12-22
 */
@RestController
@RequestMapping("/file")
@Slf4j
public class FileDetailController extends BaseController {
    @Autowired
    UploadHelper uploadHelper;

    @PostMapping("upload")
    public R upload(@RequestBody MultipartFile file){
        FileInfo fileInfo = uploadHelper.uploadFile(file, "link_music");
        return R.data(fileInfo);
    }

    @GetMapping("view")
    @NoLogin
    public void view(String id, HttpServletResponse response) {
        try {
            response.setContentType("application/force-download");// 设置强制下载不打开
            response.addHeader("Content-Disposition", "attachment;fileName=" + new String(id.getBytes("UTF-8"), "iso-8859-1"));
            Downloader downloader=uploadHelper.downLoadFile(id);
            downloader.outputStream(response.getOutputStream());
            response.flushBuffer();
        } catch (Exception e) {
            log.error("文件下载失败: " + e.getMessage());
        }
    }



}

最后首页我简单的做了一个报表统计
在这里插入图片描述

这样我们的音乐播放器的管理后台基本上就开发完整了。

说明：
因核心分享的是java编程。后续文章中基本分享的都是java语言的代码。
对于前端的代码，在文章中就不分享了。只会分享一下页面效果。
当然项目完结后，我会把前后端项目源码打包好放到最后一篇文章中。

如果有小伙伴有兴趣可以订阅此专栏，后续会持续更新直到音乐播放器这个软件完成。
我会尽可能详细的以文字的形式分享出来从0到1 写出来一个音乐播放器项目。