如下的内容段是关于Java Base64加密的内容，应该能对大伙有些用。

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) { }}}}