Java通过JavaMail的MimeUtility对字符串进行Base64编码详解编程语言

import java.io.ByteArrayInputStream; 
import java.io.ByteArrayOutputStream; 
import java.io.InputStream; 
import java.io.OutputStream; 
 
import javax.mail.internet.MimeUtility; 
 
public class Base64 { 
 public static byte[] encode(byte[] b) throws Exception { 
  ByteArrayOutputStream baos = null; 
  OutputStream b64os = null; 
  try { 
   baos = new ByteArrayOutputStream(); 
   b64os = MimeUtility.encode(baos, "base64"); 
   b64os.write(b); 
   b64os.close(); 
   return baos.toByteArray(); 
  } catch (Exception e) { 
   throw new Exception(e); 
  } finally { 
   try { 
    if (baos != null) { 
     baos.close(); 
     baos = null; 
    } 
   } catch (Exception e) { 
   } 
   try { 
    if (b64os != null) { 
     b64os.close(); 
     b64os = null; 
    } 
   } catch (Exception e) { 
   } 
  } 
 } 
 
 public static byte[] decode(byte[] b) throws Exception { 
  ByteArrayInputStream bais = null; 
  InputStream b64is = null; 
  try { 
   bais = new ByteArrayInputStream(b); 
   b64is = MimeUtility.decode(bais, "base64"); 
   byte[] tmp = new byte[b.length]; 
   int n = b64is.read(tmp); 
   byte[] res = new byte[n]; 
   System.arraycopy(tmp, 0, res, 0, n); 
 
   return res; 
  } catch (Exception e) { 
   throw new Exception(e); 
  } finally { 
   try { 
    if (bais != null) { 
     bais.close(); 
     bais = null; 
    } 
   } catch (Exception e) { 
   } 
   try { 
    if (b64is != null) { 
     b64is.close(); 
     b64is = null; 
    } 
   } catch (Exception e) { 
   } 
  } 
 } 
}