JavaSSLContext设置无效，SunCertPathBuilderException

此问题通常是由于缺少证书或证书不受信任引起的。解决此问题的方法是为SSLContext设置证书信任管理器。以下是示例代码：

import java.io.InputStream;
import java.security.KeyStore;

import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManagerFactory;

public class SSLContextExample {
   public static void main(String[] args) throws Exception {
      String keystoreFilename = "keystore.jks";
      char[] keystorePassword = "password".toCharArray();
      char[] keyPassword = "password".toCharArray();

      // Create KeyStore
      KeyStore keyStore = KeyStore.getInstance("JKS");
      try (InputStream is = SSLContextExample.class.getResourceAsStream(keystoreFilename)) {
         keyStore.load(is, keystorePassword);
      }

      // Create KeyManagerFactory
      KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance("SunX509");
      keyManagerFactory.init(keyStore, keyPassword);

      // Create TrustManagerFactory
      TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance("SunX509");
      trustManagerFactory.init(keyStore);

      // Create SSLContext
      SSLContext sslContext = SSLContext.getInstance("TLS");
      sslContext.init(keyManagerFactory.getKeyManagers(), trustManagerFactory.getTrustManagers(), null);

      // Use SSLContext
      // ...
   }
}

上述代码会从名为keystore.jks的密钥库（位于类路径中）中加载密钥和证书，并为其创建KeyManagerFactory和TrustManagerFactory。接下来，使用这些工厂创建SSLContext，并使用SSLContext进行加密通信。

注意：以上仅是示例代码，您需要根据您的实际情况修改代码。