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1.当对歌手的歌曲进行编辑时候，会把所有的歌曲信息给修改了。

解决方法:修改controller层的中SongController代码中的这一行代码

boolean flag = songService.updateById(song);

2.添加歌曲，在弹出框中输入，没有显示。原因：前端页面没有绑定相应元素。

<!--===============================错误代码 SongPage.vue==============================--><el-dialog title="添加歌曲" :visible.sync="centerDialogVisible" width="400px" center><el-form :model="registerForm" ref="registerForm" label-width="80px" enctype="multipart/form-data" id="tf"><div><label>歌名</label><el-input type="text" name="name"></el-input></div><div><label>专辑</label><el-input type="text" name="introduction"></el-input></div><div><label>歌词</label><el-input type="textarea" name="lyric"></el-input></div><div><br><label>歌曲上传</label><el-input type="file" name="file"></el-input></div></el-form><span slot="footer"><el-button size="mini" @click="centerDialogVisible = false">取消</el-button><el-button size="mini" @click="addSong">确定</el-button></span></el-dialog>
<!--======================================修改之后的代码===============================--><el-dialog title="添加歌曲" :visible.sync="centerDialogVisible" width="400px" center><el-form :model="registerForm" ref="registerForm" label-width="80px" enctype="multipart/form-data" id="tf"><div><label>歌名</label><el-input type="text" v-model="registerForm.name"></el-input></div><div><label>专辑</label><el-input type="text" v-model="registerForm.introduction"></el-input></div><div><label>歌词</label><el-input type="textarea" v-model="registerForm.lyric"></el-input></div><div><br><label>歌曲上传</label><input type="file" name="file"></div></el-form><span slot="footer"><el-button size="mini" @click="centerDialogVisible = false">取消</el-button><el-button size="mini" @click="addSong">确定</el-button></span></el-dialog>

3.添加歌手失败

后端抛出这个错误，原因：参数不匹配。

java.lang.IllegalArgumentException: argument type mismatchat sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.apache.ibatis.reflection.invoker.MethodInvoker.invoke(MethodInvoker.java:44)at org.apache.ibatis.reflection.wrapper.BeanWrapper.setBeanProperty(BeanWrapper.java:180)at org.apache.ibatis.reflection.wrapper.BeanWrapper.set(BeanWrapper.java:59)at org.apache.ibatis.reflection.MetaObject.setValue(MetaObject.java:140)...........................................................................................
2023-09-10 15:15:02.637 DEBUG 5000 --- [nio-8888-exec-1] o.s.web.servlet.DispatcherServlet        : "ERROR" dispatch for POST "/error", parameters={masked}
2023-09-10 15:15:02.639 DEBUG 5000 --- [nio-8888-exec-1] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped to org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController#error(HttpServletRequest)
2023-09-10 15:15:02.656 DEBUG 5000 --- [nio-8888-exec-1] o.s.w.s.m.m.a.HttpEntityMethodProcessor  : Using 'application/json', given [application/json, text/plain, */*] and supported [application/json, application/*+json, application/json, application/*+json]
2023-09-10 15:15:02.656 DEBUG 5000 --- [nio-8888-exec-1] o.s.w.s.m.m.a.HttpEntityMethodProcessor  : Writing [{timestamp=Sun Sep 10 15:15:02 CST 2023, status=500, error=Internal Server Error, path=/singer/add}]
2023-09-10 15:15:02.695 DEBUG 5000 --- [nio-8888-exec-1] o.s.web.servlet.DispatcherServlet        : Exiting from "ERROR" dispatch, status 500

 解决方法：检查实体类发现id字段没有自动赋值，而前端也没有传递id这个参数，同时Mysql数据库又设置了id为主键，不能为空。因此要给id加上注解，让id自增

public class Singer implements Serializable {private static final long serialVersionUID = 372984511951162091L;/*** 主键*/private Integer id;/*** 姓名*/private String name;
}//修改如下
public class Singer implements Serializable {private static final long serialVersionUID = 372984511951162091L;/*** 主键*/@TableId(value = "id",type = IdType.AUTO)private Integer id;/*** 姓名*/private String name;}

4.更新歌曲失败

原因后端中没有写对应的方法。

解决方法我们需要在songController.class中定义该方法。

/*** 更新歌曲文件*/@RequestMapping(value = "/updateSongUrl", method = RequestMethod.POST)public Object updateSongUrl(@RequestParam("file") MultipartFile avatorFile, @RequestParam("id") int id) {JSONObject jsonObject = new JSONObject();//如果文件是空的，直接返回if (avatorFile.isEmpty()) {jsonObject.put(Consts.CODE, 0);jsonObject.put(Consts.MSG, "文件上传失败");return jsonObject;}//文件名=当前时间到毫秒+原来的文件名String fileName = System.currentTimeMillis() + avatorFile.getOriginalFilename();//文件路径String filePath = System.getProperty("user.dir") + System.getProperty("file.separator") + "song";System.out.println("filePath is"+filePath);//如果文件路径不存在，新增该路径File file1 = new File(filePath);if (!file1.exists()) {file1.mkdir();}//实际的文件地址File dest = new File(filePath + System.getProperty("file.separator") + fileName);//存储到数据库里的相对文件地址String storeAvatorPath = "/song/" + fileName;try {avatorFile.transferTo(dest);//上传Song song = new Song();song.setId(id);song.setUrl(storeAvatorPath);boolean flag = songService.updateById(song);if (flag) {jsonObject.put(Consts.CODE, 1);jsonObject.put(Consts.MSG, "上传成功");jsonObject.put("song", storeAvatorPath);return jsonObject;}jsonObject.put(Consts.CODE, 0);jsonObject.put(Consts.MSG, "上传失败");return jsonObject;} catch (IOException e) {jsonObject.put(Consts.CODE, 0);jsonObject.put(Consts.MSG, "上传失败" + e.getMessage());} finally {return jsonObject;}}