InputStream与String,Byte之间互转

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itStream outStream = nenputStream;  
import java.io.ByteArrayOutputStream;  
import java.io.IOException;  
import java.io.InputStream;  
  
/**  
 *   
 * @author Andy.Chen  
 * @mail [email protected]  
 *  
 */  
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);  
	}  

} 

转自： http://blog.csdn.net/cjjky/article/details/6892443