java 读取服务器上的二进制文件(网络文件)

public static List<String> dataInputStream(String filepath) throws IOException {

//    File file = new File(filepath);
//    DataInputStream dps = new DataInputStream(new FileInputStream(file));

        URL url = new URL(filepath);
        URLConnection conn = url.openConnection();
        InputStream stream = conn.getInputStream();
        DataInputStream dps = new DataInputStream(stream);
        StringBuilder hexData = new StringBuilder();
        byte bt = 0;

//    long fileLength = file.length();
      long fileLength = conn.getContentLength();
//    long fileLength = url.getFile().length();
        System.out.println(fileLength);
        List<String> fileContent = new ArrayList<String>();
        for (int i = 0; i < fileLength; i++) {
            // 每行只存254个字符
            if (i % 127 == 0) {
                fileContent.add(hexData.toString());
                hexData = new StringBuilder();
            }
            bt = dps.readByte(); // 以十六进制的无符号整数形式返回一个字符串表示形式。
            String str = Integer.toHexString(bt);
            if (str.length() == 8) { // 去掉补位的f
                str = str.substring(6);
            }
            if (str.length() == 1) {
                str = "0" + str;
            }
            hexData.append(str.toUpperCase());
        }
        fileContent.add(hexData.toString());
        return fileContent;
    }

来源：oschina

链接：https://my.oschina.net/liudandan/blog/4492176