How to solve HTTPS certificate verification exception?

HTTPS certificate verification is abnormal, what should I do if the verification fails? The following article will introduce to you the solution to the failure of HTTPS request verification certificate. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

Error report: unable to find valid certification path to requested target

Solution:

1. Import Certificate to the local certificate store

2. Trust all SSL certificates

The best solution may be to trust all SSL certificates, because sometimes it is very troublesome to import the certificate manually every time. Now a method is encapsulated, just ignore the certificate when connecting to openConnection.

SslUtils.java

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);
}
 
}

SslTest.java:

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();
        }
    }
 
}

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