java实现一个文件上传接口

Bertha 。 2022-11-07 14:38 225阅读 0赞

## 接口声明 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xlZnRmaXN0_size_16_color_FFFFFF_t_70_pic_center]  
这个接口的参数描述还算详细。主要是用了Swagger的注解@ApiParam。

@RestController
    @RequestMapping("/upload")
    @Api(tags="文件上传")
    public class AliyunOssController { 
        @Autowired
        UploadService service;
    
        @PostMapping(value = "/comment/{bId}/{uId}")
        @ApiOperation(value = "上传评论图片或视频，成功后返回文件路径",notes = "/upload/comment/板块ID/用户ID")
        public JSONObject comment(@ApiParam(value = "版块ID", required = true) @PathVariable String bId,
                                  @ApiParam(value = "用户ID", required = true) @PathVariable String uId,
                                  @ApiParam(value = "文件", required = true) @RequestParam(value="f") MultipartFile file) { 
            String url = service.upload(bId,uId,file);
            ……
            
            JSONObject jo = new JSONObject();
            jo.put("code",200);
            jo.put("msg","ok");
            jo.put("data",url);
    
            return jo;
        }
    }

## 接口实现 ##

@Service("uploadService")
    public class UploadService { 
        public String upload(String bId,
                             String uId,
                             MultipartFile file) { 
            //获得文件保存路径
            String url = getFilePath(bId, uId, file);
    		saveToLocal(file);
            return url;
        }
    	private void saveToLocal(MultipartFile file){ //上传到本地
    	    try { 
    	        String fileName = file.getOriginalFilename();
    	        InputStream input = file.getInputStream();
    	        OutputStream outputStream = new FileOutputStream("q:" + File.separator + fileName);
    	        byte[] b = new byte[4096];
    	        int count = input.read(b);
    	        while (count != -1) { 
    	            for(int i = 0; i < count; i++){ 
    	                outputStream.write(b[i]);
    	            }
    	            count = input.read(b);
    	        }
    	        input.close();
    	        outputStream.close();
    	    } catch (FileNotFoundException e) { 
    	        e.printStackTrace();
    	    } catch (IOException e) { 
    	        e.printStackTrace();
    	    }
    	}
    }

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