Java从pfx中获取公私钥

package com.Jinhill;
import java.io.*;
import java.util.*;
import java.security.*;
import java.security.cert.Certificate;

public class ReadPFX {
public ReadPFX (){
}
//转换成十六进制字符串
public static String Byte2String(byte[] b) {
String hs="";
String stmp="";

for (int n=0;n<b.length;n++) {
stmp=(java.lang.Integer.toHexString(b
& 0XFF));
if (stmp.length()==1) hs=hs+"0"+stmp;
else hs=hs+stmp;
//if (n<b.length-1)  hs=hs+":";
}
return hs.toUpperCase();
}

public static byte[] StringToByte(int number) {
int temp = number;
byte[] b=new byte[4];
for (int i=b.length-1;i>-1;i--){
b[i] = new Integer(temp&0xff).byteValue();//将最高位保存在最低位
temp = temp >> 8; //向右移8位
}
return b;
}
private  PrivateKey GetPvkformPfx(String strPfx, String strPassword){
try	{
KeyStore ks = KeyStore.getInstance("PKCS12");
FileInputStream fis = new FileInputStream(strPfx);
// If the keystore password is empty(""), then we have to set
// to null, otherwise it won't work!!!
char[] nPassword = null;
if ((strPassword == null) || strPassword.trim().equals("")){
nPassword = null;
}
else
{
nPassword = strPassword.toCharArray();
}
ks.load(fis, nPassword);
fis.close();
System.out.println("keystore type=" + ks.getType());
// Now we loop all the aliases, we need the alias to get keys.
// It seems that this value is the "Friendly name" field in the
// detals tab <-- Certificate window <-- view <-- Certificate
// Button <-- Content tab <-- Internet Options <-- Tools menu
// In MS IE 6.
Enumeration enumas = ks.aliases();
String keyAlias = null;
if (enumas.hasMoreElements())// we are readin just one certificate.
{
keyAlias = (String)enumas.nextElement();
System.out.println("alias=[" + keyAlias + "]");
}
// Now once we know the alias, we could get the keys.
System.out.println("is key entry=" + ks.isKeyEntry(keyAlias));
PrivateKey prikey = (PrivateKey) ks.getKey(keyAlias, nPassword);
Certificate cert = ks.getCertificate(keyAlias);
PublicKey pubkey = cert.getPublicKey();
System.out.println("cert class = " + cert.getClass().getName());
System.out.println("cert = " + cert);
System.out.println("public key = " + pubkey);
System.out.println("private key = " + prikey);
return prikey;
}
catch (Exception e)
{
e.printStackTrace();
}
return null;
}
}