如何存储key.pem (我想是这样的？)这样我就可以在我的MySSLSocketFactory类中使用它了？

import java.io.FileInputStream;
import java.security.Key;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.cert.Certificate;

public class MySSLSocketFactory {
    private static final String KEY_STORE_PATH = "certs/key.pem";
    private static final String KEY_STORE_PASSWORD = "your_keystore_password";

    private Key privateKey;

    public MySSLSocketFactory() {
        try {
            // 加载 KeyStore
            KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
            FileInputStream fis = new FileInputStream(KEY_STORE_PATH);
            keyStore.load(fis, KEY_STORE_PASSWORD.toCharArray());
            
            // 获取私钥
            privateKey = keyStore.getKey("keyAlias", KEY_STORE_PASSWORD.toCharArray());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    // 其他实现代码...
}