java privatekey certificate pfx

pfx.java

/**
 * @(#)文本1.java
 *
 *
 * @author 
 * @version 1.00 2015/3/31
 */
import java.security.PrivateKey;
import java.io.*;
import java.security.*;
import java.security.spec.*;
import java.security.cert.*;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

public class main {
	 public static PrivateKey getPrivateKey(String filename)
	  throws Exception {
	
	    File f = new File(filename);
	    FileInputStream fis = new FileInputStream(f);
	    DataInputStream dis = new DataInputStream(fis);
	    byte[] keyBytes = new byte[(int)f.length()];
	    dis.readFully(keyBytes);
	    dis.close();
	
	    PKCS8EncodedKeySpec spec =
	      new PKCS8EncodedKeySpec(keyBytes);
	    KeyFactory kf = KeyFactory.getInstance("RSA");
	    return kf.generatePrivate(spec);
	  }
  	public static X509Certificate getCertificate(String filename)
		  throws Exception {
		CertificateFactory fact = CertificateFactory.getInstance("X.509");
	    FileInputStream is = new FileInputStream (filename);
	    X509Certificate cer = (X509Certificate) fact.generateCertificate(is);
	    return cer;
	  }
	  
    public static void main(String args[])  throws Exception{
    	Security.addProvider(new BouncyCastleProvider());
	    PrivateKey pkey = getPrivateKey("2048.der");
	    X509Certificate cert = getCertificate("2048.cer");
	     
	    KeyStore ks = KeyStore.getInstance("PKCS12", "BC");   
	    char[] password = "abc123".toCharArray();
	    ks.load(null,null);
	    ks.setCertificateEntry(cert.getSerialNumber().toString(), cert);
	    ks.setKeyEntry(cert.getSerialNumber().toString(), pkey, password, new java.security.cert.Certificate[]{cert,cert});
	    FileOutputStream fos = new FileOutputStream("2048.pfx");
	    ks.store(fos, password);
	    fos.close();
    }
    

}