https網站服務器都是有證書的。 是由網站自己的服務器簽發的，並不被瀏覽器或操作系統廣泛接受。

　　在使用CloseableHttpClient時經常遇到證書錯誤(知乎的網站就是這樣)

　　現在需要SSL繞過證書，下面直接貼出代碼，調用時只需要在發送請求後 new HttpsBerBer(文件的字節碼) ;

 1 import javax.net.ssl.HostnameVerifier;
 2 import javax.net.ssl.HttpsURLConnection;
 3 import javax.net.ssl.SSLSession;
 4 import java.util.logging.Logger;
 
 5 
 6 public class HttpsBerBer {
 7     public HttpsBerBer(String name) throws Exception {
 8         logger = Logger.getLogger(name);
 9         trustAllHttpsCertificates();
10         HostnameVerifier hv = new HostnameVerifier() {
11             public boolean verify(String urlHostName, SSLSession session) {
 
12                 logger.info("Warning: URL Host: " + urlHostName + " vs. " + session.getPeerHost());
13                 return true;
14             }
15         };
16         HttpsURLConnection.setDefaultHostnameVerifier(hv);
17     }
18     private static Logger logger ;
19     private static void
 
 trustAllHttpsCertificates() throws Exception {
20         javax.net.ssl.TrustManager[] trustAllCerts = new javax.net.ssl.TrustManager[1];
21         javax.net.ssl.TrustManager tm = new miTM();
22         trustAllCerts[0] = tm;
23         javax.net.ssl.SSLContext sc = javax.net.ssl.SSLContext
24                 .getInstance("SSL");
25         sc.init(null, trustAllCerts, null);
26         javax.net.ssl.HttpsURLConnection.setDefaultSSLSocketFactory(sc
27                 .getSocketFactory());
28     }
29     static class miTM implements javax.net.ssl.TrustManager,
30             javax.net.ssl.X509TrustManager {
31         public java.security.cert.X509Certificate[] getAcceptedIssuers() {
32             return null;
33         }
34 
35         public boolean isServerTrusted(
36                 java.security.cert.X509Certificate[] certs) {
37             return true;
38         }
39 
40         public boolean isClientTrusted(
41                 java.security.cert.X509Certificate[] certs) {
42             return true;
43         }
44 
45         public void checkServerTrusted(
46                 java.security.cert.X509Certificate[] certs, String authType)
47                 throws java.security.cert.CertificateException {
48             return;
49         }
50 
51         public void checkClientTrusted(
52                 java.security.cert.X509Certificate[] certs, String authType)
53                 throws java.security.cert.CertificateException {
54             return;
55         }
56     }
57 }

Java爬蟲--Https繞過證書