import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.InputStream;

/**

 * @see 
       InputStream转化为String
       String 转换为InputStream
       InputStream 转化为byte数组
       byte转化为InputStream
       byte转化为String

 * @author 胖先生

 * @mail hanpang8983@foxmail.com

 *

 */

public class InputStreamUtils {

    final static int BUFFER_SIZE = 4096;

    /**

     * 将InputStream转换成String

     * @param in InputStream

     * @return String

     * @throws Exception

     *

     */

    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

     * @param in

     * @param encoding

     * @return

     * @throws Exception

     */

         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

     * @param in

     * @return

     * @throws Exception

     */

    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

     * @param in InputStream

     * @return byte[]

     * @throws IOException

     */

    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

     * @param in

     * @return

     * @throws Exception

     */

    public static InputStream byteTOInputStream(byte[] in) throws Exception{

        ByteArrayInputStream is = new ByteArrayInputStream(in);

        return is;

    }

    /**

     * 将byte数组转换成String

     * @param in

     * @return

     * @throws Exception

     */

    public static String byteTOString(byte[] in) throws Exception{

        InputStream is = byteTOInputStream(in);

        return InputStreamTOString(is);

    }

}