Java Base64加密代码

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) {
}
}
}
}

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) {
   }
  }
 }
}