How to solve HTTPS certificate verification exception?

import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
 
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
 
public class SslUtils {private static void trustAllHttpsCertificates() throws Exception {
    TrustManager[] trustAllCerts = new TrustManager[1];
    TrustManager tm = new miTM();
    trustAllCerts[0] = tm;
    SSLContext sc = SSLContext.getInstance("SSL");
    sc.init(null, trustAllCerts, null);
    HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
}
 
static class miTM implements TrustManager,X509TrustManager {
    public X509Certificate[] getAcceptedIssuers() {
        return null;
    }
 
    public boolean isServerTrusted(X509Certificate[] certs) {
        return true;
    }
 
    public boolean isClientTrusted(X509Certificate[] certs) {
        return true;
    }
 
    public void checkServerTrusted(X509Certificate[] certs, String authType)
            throws CertificateException {
        return;
    }
 
    public void checkClientTrusted(X509Certificate[] certs, String authType)
            throws CertificateException {
        return;
    }
}
 
/**
 * 忽略HTTPS请求的SSL证书，必须在openConnection之前调用
 * @throws Exception
 */
public static void ignoreSsl() throws Exception{
    HostnameVerifier hv = new HostnameVerifier() {
        public boolean verify(String urlHostName, SSLSession session) {
            System.out.println("Warning: URL Host: " + urlHostName + " vs. " + session.getPeerHost());
            return true;
        }
    };
    trustAllHttpsCertificates();
    HttpsURLConnection.setDefaultHostnameVerifier(hv);
}
 
}

import java.io.OutputStreamWriter;
import java.net.URL;
import java.net.URLConnection;
import org.apache.commons.io.IOUtils;
 
public class SslTest {
     
    public String getRequest(String url,int timeOut) throws Exception{
        URL u = new URL(url);
        if("https".equalsIgnoreCase(u.getProtocol())){
            SslUtils.ignoreSsl();
        }
        URLConnection conn = u.openConnection();
        conn.setConnectTimeout(timeOut);
        conn.setReadTimeout(timeOut);
        return IOUtils.toString(conn.getInputStream());
    }
     
    public String postRequest(String urlAddress,String args,int timeOut) throws Exception{
        URL url = new URL(urlAddress);
        if("https".equalsIgnoreCase(url.getProtocol())){
            SslUtils.ignoreSsl();
        }
        URLConnection u = url.openConnection();
        u.setDoInput(true);
        u.setDoOutput(true);
        u.setConnectTimeout(timeOut);
        u.setReadTimeout(timeOut);
        OutputStreamWriter osw = new OutputStreamWriter(u.getOutputStream(), "UTF-8");
        osw.write(args);
        osw.flush();
        osw.close();
        u.getOutputStream();
        return IOUtils.toString(u.getInputStream());
    }
     
    public static void main(String[] args) {
        try {
            SslTest st = new SslTest();
            String a = st.getRequest("https://xxx.com/login.action", 3000);
            System.out.println(a);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
}