Springboot+Apache2 or Tomcat realizes remote Linux server upload and download files

Requirements : Upload files to a remote server and provide download functions.

Solution: Use Apache2, Tomcat or FTP to build a file server.

There are many online tutorials on the deployment of Apache2, Tomcat, and FTP. I have used all three, mainly divided into two methods:

For example, ftp can directly upload and download the java project after connecting with it. There are many tutorials on the Internet for this method;

If you use Apache2 and Tomcat, you can’t upload it directly. You can only deploy a project on the server to complete the operation of the server file. The following is how to achieve this. After setting up a service in Apache2, Tomcat, and FTP, create a directory to save files. I used apache2, so I put the files in /var/www/ and created a file folder. Then you need two springboot projects, one as the server and the other as the client.

Client:

Front page:

 
<input id="cert" type="file" onchange="submit()" />


function submit() {
        var formData = new FormData();
        formData.append('file', $("#cert")[0].files[0]); //生成一对表单属性
        console.log(formData)
        $.ajax({
            type: "POST", //因为是传输文件，所以必须是post
            url: '/upload', //对应的后台处理类的地址
            data: formData,
            processData: false,
            contentType: false,
            success: function(data) {
                   
            }
        });
    }

Client background interface: 

@ApiOperation(value = "上传图片接口")
    @PostMapping(value = "/upload")
    public String upload(@RequestParam("file") MultipartFile file) {
        if (file.isEmpty()) {
            return "失败";
        }
        JSONObject postData = new JSONObject();
        String fileName = file.getOriginalFilename();//上传的文件名
        String suffixName = fileName.substring(fileName.lastIndexOf("."));//获取后缀
        fileName = UUID.randomUUID() + suffixName;//生成唯一文件名
        try {
            byte[] fileBytes = file.getBytes();//转换为byte数组
            postData.put("fileName",fileName);
            postData.put("data",fileBytes);
            RestTemplate client = new RestTemplate();
            //FilePath是你服务端的项目接口路径
            JSONObject json = client.postForEntity(FilePath, postData, JSONObject.class).getBody();
            logger.info("上传成功");
            return json.get("data");//返回文件下载地址
        } catch (IOException e) {
            logger.error(e.toString(), e);
        }
        logger.info("上传失败");
        return "失败";
    }

 The download address of the file is returned after the upload is successful.

Server interface:

@RestController
@RequestMapping(value = "upload")
@Slf4j
public class API {
    /**
     * 访问服务器文件路径端口 
     */
    @Value(value="${filePath}")
    private String imgPath;
    /**
     *  服务器保存文件路径
     */
    @Value(value="${uploadHost}")
    private String uploadHost;

    /**
     *  项目host路径
     */
    @ApiOperation(value = "上传图片接口", notes = "")
    @PostMapping(value = "/upImg")
    public JSONObject upImg(@RequestBody String json) {
        JSONObject jsonObject =new JSONObject();
        byte[] bfile = JSONObject.parseObject(json).getBytes("data");
        String fileName =JSONObject.parseObject(json).getString("fileName");
        byte2File(bfile,uploadHost,fileName);
        if (json.isEmpty()) {
            return null;
        }
        try {
            log.info("上传成功");
            jsonObject.put("data",imgPath+fileName);
            return jsonObject;
        } catch (Exception e) {
            log.info("上传失败");
            jsonObject.put("message",e.toString());
        }
        return jsonObject;
    }

//byte数组转file文件方法
    public static void byte2File(byte[] bfile,String filePath,String fileName){
        BufferedOutputStream bos=null;
        FileOutputStream fos=null;
        File file=null;
        try{
            File dir=new File(filePath);
            if(!dir.exists() && !dir.isDirectory()){//判断文件目录是否存在
                dir.mkdirs();
            }
            file=new File(filePath+fileName);
            fos=new FileOutputStream(file);
            bos=new BufferedOutputStream(fos);
            bos.write(bfile);
        }
        catch(Exception e){
            System.out.println(e.getMessage());
            e.printStackTrace();
        }
        finally{
            try{
                if(bos != null){
                    bos.close();
                }
                if(fos != null){
                    fos.close();
                }
            }
            catch(Exception e){
                System.out.println(e.getMessage());
                e.printStackTrace();
            }
        }
    }

}

Server configuration file application.yml

server:
  port: 8099


#访问服务器文件路径端口
filePath: http://你的IP:88/
#服务器保存文件路径
uploadHost: /var/www/file/