Read text from InputStream

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Read/convert an InputStream to a String 56 answers

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取决于您所熟悉的许可证，这是雅加达共享IO库的一个班轮。

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Do specify the character encoding. Do not waste code, introduce bugs, and slow execution with a BufferedReader .

Here is an example. You could parameterize it with a buffer size, encoding, etc.

static String readString(InputStream is) throws IOException {
  char[] buf = new char[2048];
  Reader r = new InputStreamReader(is, "UTF-8");
  StringBuilder s = new StringBuilder();
  while (true) {
    int n = r.read(buf);
    if (n < 0)
      break;
    s.append(buf, 0, n);
  }
  return s.toString();
}

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Using Commons-IO is likely to be the best option. For your interest, another approach is to copy all the bytes and then convert it into a String.

public static String readText(InputStream is, String charset) throws IOException {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    byte[] bytes = new byte[4096];
    for(int len;(len = is.read(bytes))>0;)
        baos.write(bytes, 0, len);
    return new String(baos.toByteArray(), charset);
}

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