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;  
      
    /** 
     *  
     * @author Andy.Chen 
     * @mail [e-mail] 
     * 
     */  
    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);  
        }  
      
    }