java eml解析

public static void main(String[] args) throws IOException {  
         byte[] buff = new byte[1024];  
         byte[] s=(new BASE64Decoder()).decode("MS5rdHI=");  
         InputStream is = new ByteArrayInputStream(s);  
         int len = -1;  
         while(-1 != (len = is.read(buff))) {  
             String res = new String(buff, 0, len);  
             System.out.println(res);  
         }  
     }