读取网络文件，在上传到其它文件服务器

男娘i 2022-01-22 14:07 195阅读 0赞

d读取网络文件 eg:[http://www.gov.cn/zhengce/pdfFile/2019\_PDF.pdf][http_www.gov.cn_zhengce_pdfFile_2019_PDF.pdf]。

1.  ### 读取网络文件保存到本地，在读取本地文件上传到其它服务器--oss，s3... ###

URL url = new URL(filePath);
       URLConnection uc = url.openConnection();
       InputStream in = uc.getInputStream();
       //InputStream fileInputStream = new FileInputStream(in);
       // 构建文件信息
       String radomName = UUID.randomUUID().toString().replace("-","");
       String localFile = localPath+File.separator +radomName+"."+ext;//web 的服务器的路径
       File file = new File(localFile);
       FileUtils.copyURLToFile(url,file);
    
       String fileNameOss = radomName+"."+ext;
       File fileOss = new File(localFile);
       InputStream inOss  = new FileInputStream(fileOss);

得到文件后缀

/**
         * 文件后缀
         * @param filename
         * @return
         */
        public static String ext(String filename) {
            int index = filename.lastIndexOf(".");
            if (index == -1) {
                return null;
            }
            String result = filename.substring(index + 1);
            return result;
        }

1.  ### 读取网络文件，暂存输入流，在上传到其它文件服务器--oss ,s3... ###

String filePath = "http://www.gov.cn/zhengce/pdfFile/2019_PDF.pdf";
    URL url = new URL(filePath);
    URLConnection uc = url.openConnection();
    InputStream inputStream = uc.getInputStream();//获取网络数据
    
    byte[] b = readStream1(inputStream);//暂存文件
    InputStream isOss = new ByteArrayInputStream(b);//创建输入流，往下游传递

读取文件，暂存到数组到内存中

public static byte[] readByte(InputStream in) {
    
            byte[] b = null;
            ByteArrayOutputStream outSteam = null;
            try {
                byte[] buffer = new byte[1024 * 4];
                outSteam = new ByteArrayOutputStream();
                int len = -1;
                while ((len = in.read(buffer)) != -1) {
                    outSteam.write(buffer, 0, len);
                }
                b = outSteam.toByteArray();
            } catch (IOException e) {
                e.printStackTrace();
            } finally{
                try {
                    if(outSteam!=null){
                        outSteam.close();
                        outSteam = null;
                    }
                    if(in!=null){
                        in.close();
                        in = null;
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return b;
        }

[http_www.gov.cn_zhengce_pdfFile_2019_PDF.pdf]: http://www.gov.cn/zhengce/pdfFile/2019_PDF.pdf