java读取微信p12证书信息

import java.security.*;
import java.security.cert.X509Certificate;
public class TestController {
/**
	 * 获取私钥
	 */
	public static void main(String args[]) throws Exception {
		String mchId = "商户号";
		KeyStore ks = KeyStore.getInstance("PKCS12");
		ks.load(getCertStream(""), mchId.toCharArray());
		String alias = ks.aliases().nextElement();
		X509Certificate certificate = (X509Certificate) ks.getCertificate(alias);
		java.util.Date notBefore = certificate.getNotBefore(); // 证书开始有效日期
		java.util.Date notAfter = certificate.getNotAfter(); // 证书结束有效日期
		String serialNo = certificate.getSerialNumber().toString(16).toUpperCase();
		PrivateKey privateKey = (PrivateKey) ks.getKey(alias, mchId.toCharArray());
		System.out.println("证书开始有效日期：" + notBefore);
		System.out.println("证书结束有效日期：" + notAfter);
		System.out.println("---------serialNo------" + serialNo);
		System.out.println("---------privateKey--------" + privateKey);


	}

	/**
	 * 读取证书
	 */
	public static InputStream getCertStream(String certPath) {
		byte[] certData = null;
		try {
		     //通过路径读取
            //InputStream certStream = new FileInputStream(new File(certPath));
            //放到项目resources目录读取
			InputStream certStream = Thread.currentThread().getContextClassLoader()
				.getResourceAsStream("apiclient_cert.p12");
			certData = IOUtils.toByteArray(certStream);
			certStream.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
		ByteArrayInputStream certBis = new ByteArrayInputStream(certData);
		return certBis;
	}
}