異常解決：sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

前幾天用JSOUP寫爬蟲Demo時，遇到這個異常

百度了一番原來是因為目標站點啟用了HTTPS 而缺少安全證書時出現的異常，大概解決辦法有2種：

　　1. 手動導入安全證書(嫌麻煩 沒使用);

　　2. 忽略證書驗證。

　　　　相對於來說簡單一點，在發起請求前調用這個方法，問題解決。

// 包不要導錯了
import javax.net.ssl.*;
import java.security.SecureRandom;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
/**
* 信任任何站點，實現https頁面的正常訪問
*/

public static void trustEveryone() {

try {
        HttpsURLConnection.setDefaultHostnameVerifier(new HostnameVerifier() {
            public boolean verify(String hostname, SSLSession session) {
                return true;
            }
        });

        SSLContext context = SSLContext.getInstance("TLS");
        context.init(null, new X509TrustManager[]{new X509TrustManager() {
            public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
            }

            public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
            }

            public X509Certificate[] getAcceptedIssuers() {
                return new X509Certificate[0];
            }
        }}, new SecureRandom());
        HttpsURLConnection.setDefaultSSLSocketFactory(context.getSocketFactory());
    } catch (Exception e) {
        e.printStackTrace();
    }
}