java中byte,String,InputStream之间的转换

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.InputStream;

public class InputStreamUtils {

	final static int BUFFER_SIZE = 4096;

	// 将InputStream转换成String
	public static String InputStreamTOString(InputStream in) throws Exception {

		ByteArrayOutputStream outStream = new ByteArrayOutputStream();

		byte[] data = new byte[BUFFER_SIZE];

		int count = -1;

		while ((count = in.read(data, 0, BUFFER_SIZE)) != -1)

			outStream.write(data, 0, count);

		data = null;

		return new String(outStream.toByteArray(), "ISO-8859-1");

	}

	// 将InputStream转换成某种字符编码的String
	public static String InputStreamTOString(InputStream in, String encoding)
			throws Exception {

		ByteArrayOutputStream outStream = new ByteArrayOutputStream();

		byte[] data = new byte[BUFFER_SIZE];

		int count = -1;

		while ((count = in.read(data, 0, BUFFER_SIZE)) != -1)

			outStream.write(data, 0, count);

		data = null;

		return new String(outStream.toByteArray(), "ISO-8859-1");

	}

	// 将String转换成InputStream
	public static InputStream StringTOInputStream(String in) throws Exception {

		ByteArrayInputStream is = new ByteArrayInputStream(in.getBytes("ISO-8859-1"));

		return is;

	}

	// 将InputStream转换成byte数组
	public static byte[] InputStreamTOByte(InputStream in) throws IOException {

		ByteArrayOutputStream outStream = new ByteArrayOutputStream();

		byte[] data = new byte[BUFFER_SIZE];

		int count = -1;

		while ((count = in.read(data, 0, BUFFER_SIZE)) != -1)

			outStream.write(data, 0, count);

		data = null;

		return outStream.toByteArray();

	}

	// 将byte数组转换成InputStream
	public static InputStream byteTOInputStream(byte[] in) throws Exception {

		ByteArrayInputStream is = new ByteArrayInputStream(in);

		return is;

	}

	// 将byte数组转换成String
	public static String byteTOString(byte[] in) throws Exception {

		InputStream is = byteTOInputStream(in);

		return InputStreamTOString(is);

	}

}