InputStream与String/byte[]相互转换

public class InputStreamUtils {

private static final String CHARSET_NAME = "UTF-8";
private static final int BUFFER_SIZE = 1024;

/**
* 将字符串转换成InputStream
* @param string
* @return
* @throws UnsupportedEncodingException
*/
public static InputStream string2InputStream(String string) throws UnsupportedEncodingException {
  ByteArrayInputStream inputStream = new ByteArrayInputStream(string.getBytes(CHARSET_NAME));
  return inputStream;
}

/**
* 将InputStream转换成指定编码的String
* @param is
* @return
* @throws Exception
*/
public static String inputStream2String(InputStream is) throws Exception {
  ByteArrayOutputStream os = new ByteArrayOutputStream();
  byte[] data = new byte[BUFFER_SIZE];
  int len = -1;
  while (-1 != (len = is.read(data, 0, BUFFER_SIZE))) {
   os.write(data, 0, len);
  }
  return new String(os.toByteArray(), CHARSET_NAME);
}

/**
* 将byte[]转换成IntputStream
* @param buf
* @return
*/
public static InputStream byte2InputStream(byte[] buf) {
  ByteArrayInputStream inputStream = new ByteArrayInputStream(buf);
  return inputStream;
}

/**
* 将IntputStream转换成byte[]
* @param is
* @return
* @throws IOException
*/
public static byte[] inputStream2Byte(InputStream is) throws IOException {
  ByteArrayOutputStream os = new ByteArrayOutputStream();
  byte[] date = new byte[BUFFER_SIZE];
  int len = -1;
  while (-1 != (len = is.read(date, 0, BUFFER_SIZE))) {
   os.write(date, 0, BUFFER_SIZE);
  }
  return os.toByteArray();
}

}

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