springboot项目下载网络文件到本地,返回网络路径,简单实用

刚开始用这种方式

public static String downloadImage(String fileUrl ) {
        long l = 0L;
        String path = null;
        String staticAndMksDir = null;
        if (fileUrl != null) {
            //下载时文件名称
            String fileName = fileUrl.substring(fileUrl.lastIndexOf("."));
            DataInputStream fis = null;
            BufferedInputStream bis = null;
            OutputStream outputStream=null;
            BufferedOutputStream out=null;

            try {
                String dataStr = new SimpleDateFormat("yyyyMMdd").format(new Date());
                String uuidName = UUID.randomUUID().toString();
                path = "resources/images/"+dataStr+"/"+uuidName+fileName;
                staticAndMksDir = SpringPath.getStaticAndMksDir("resources", "images",dataStr
                       );
                File file =new File(staticAndMksDir ,uuidName+fileName);
          
                file.createNewFile();
                outputStream = new FileOutputStream(file,true);
                out = new BufferedOutputStream(outputStream);
                URL url = new URL(fileUrl);
                fis = new DataInputStream(url.openStream());
                byte[] buffer = new byte[1024];
                bis = new BufferedInputStream(fis);
                int i = bis.read(buffer);
                while (i != -1) {
                    out.write(buffer,0, i);
                    i = bis.read(buffer);
                }

            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                if (bis != null) {
                    try {
                        bis.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                if (fis != null) {
                    try {
                        fis.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                if(out!=null){
                    try {
                        out.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                if(outputStream!=null){
                    try {
                        outputStream.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
        return path;
    }
}

在公司大牛指导下,改成了这种方式

import cn.hutool.http.HttpUtil;//需要导入的包

    public static String downloadImage(String fileUrl ) {
        long l = 0L;
        String path = null;
        String staticAndMksDir = null;
        if (fileUrl != null) {
            //下载时文件名称
            String fileName = fileUrl.substring(fileUrl.lastIndexOf("."));
            try {
                String dataStr = new SimpleDateFormat("yyyyMMdd").format(new Date());
                String uuidName = UUID.randomUUID().toString();
                path = "resources/images/"+dataStr+"/"+uuidName+fileName;
                staticAndMksDir = Paths.get(ResourceUtils.getURL("classpath:").getPath(),"resources", "images",dataStr).toString();
                HttpUtil.downloadFile(fileUrl, staticAndMksDir + File.separator + uuidName + fileName);
            } catch (Exception e) {
                e.printStackTrace();
            } finally {

            }
        }
        System.out.println(System.currentTimeMillis()-l);
        return path;
    }

简单了很多, SpringPath.getStaticAndMksDir会返回项目的资源路径, 后面可直接拼上自己的路径, 可直接在网络路径中访问, 兼容本地启动和jar包启动方式