解决https请求证书认证失败 javax.net.ssl.SSLHandshakeException

javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

import lombok.experimental.UtilityClass;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.conn.ssl.TrustStrategy;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.ssl.SSLContextBuilder;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.security.cert.X509Certificate;
import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;

@UtilityClass
public class SSLClient {
    public static CloseableHttpClient createSSLClient() {
        SSLContext sslContext = null;
        try {
            sslContext = new SSLContextBuilder().loadTrustMaterial(null, new TrustStrategy() {
                @Override
                public boolean isTrusted(java.security.cert.X509Certificate[] x509Certificates, String s) throws CertificateException {
                    // 通过所有证书
                    return true;
                }
            }).build();
            SSLConnectionSocketFactory sslSocketFactory = new SSLConnectionSocketFactory(sslContext, new HostnameVerifier() {
                @Override
                public boolean verify(String hostname, SSLSession session) {
                // 不验证hostname
                    return true;
                }
            });
            // 如果异常了,创建普通的client
            return HttpClients.custom().setSSLSocketFactory(sslSocketFactory).build();
        } catch (KeyManagementException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (KeyStoreException e) {
            e.printStackTrace();
        }
        return HttpClients.createDefault();
    }

}

在执行请求前，调用上面的代码

public static String getRequest(String url, String param) {
        try {
            HttpGet httpGet = new HttpGet(url + "?" + param);
            httpClient = SSLClient.createSSLClient();
            CloseableHttpResponse httpResponse = httpClient.execute(httpGet);
            if (httpResponse.getStatusLine().getStatusCode() == 200) {
                // 发送成功
                return EntityUtils.toString(httpResponse.getEntity());
            } else {
                // 发送失败
                return null;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

这个工具类是之前在网上找到的，已经找不到地址了，侵权删除