怎样用JAVA程序连接需要客户端证书认证的SSL WEB网站

我建立了一个需要客户端证书认证的WEB站点,但是用我如下JAVA程序进行连接时,始终返回错误的证书提示:
try
{
   String sAlgorithm = TrustManagerFactory.getDefaultAlgorithm();
   SSLContext ctx = SSLContext.getInstance("SSL");

            KeyManagerFactory kmf = KeyManagerFactory.getInstance(sAlgorithm);
            TrustManagerFactory tmf = TrustManagerFactory.getInstance(sAlgorithm);            KeyStore ks = KeyStore.getInstance("jks");
            KeyStore tks = KeyStore.getInstance("jks");
            
            String  sCKPass ="[email protected]";
            String  sCTKPass ="[email protected]";            ks.load(new FileInputStream("d:/appserver.jks"), sCKPass .toCharArray());
            tks.load(new FileInputStream("d:/appserver.jks"), sCKPass .toCharArray());            kmf.init(ks, sCKPass.toCharArray());
            tmf.init(tks);            ctx.init(kmf.getKeyManagers(), tmf.getTrustManagers(), null);
            
    SSLSocket socket = (SSLSocket) ctx.getSocketFactory().createSocket("127.0.0.1", 443);

    socket.startHandshake();

    String sAffirmParam = "RequestType=AppConfirm&RequestData=abcd";
            
    Writer out = new OutputStreamWriter(socket.getOutputStream(), "GBK");
            out.write("GET /AffirmServer?" + sAffirmParam + 
               " HTTP/1.1\r\nAccept: */*\r\n");
            out.write("Host: 127.0.0.1:443\r\n");
            out.write("\r\n");
            out.flush();
            String sLine = null;
            
            BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream(), "GBK"));
            while((sLine = in.readLine())!=null){
             System.out.println(sLine);
            }

}
catch(Exception err)
{
err.printStackTrace();
}其中appserver.jks中包含了客户端密钥和证书,以及服务器端的证书和根证书
执行后的错误消息为:javax.net.ssl.SSLHandshakeException: Received fatal alert: bad_certificate,
但是用openssl生成p12格式的证书并导入的浏览器后,可以与服务器正常通信!但用上面的java客户端却始终不行,不知道是怎么会事呀?