報錯：unable to find valid certification path to requested target

新增如下程式碼：

　　static class MyTM implements javax.net.ssl.TrustManager,
            javax.net.ssl.X509TrustManager {
        public java.security.cert.X509Certificate[] getAcceptedIssuers() {
            return null;
        }
        public
 
 boolean isServerTrusted(
                java.security.cert.X509Certificate[] certs) {
            return true;
        }
        public boolean isClientTrusted(
                java.security.cert.X509Certificate[] certs) {
            return true;
        }
        public void checkServerTrusted(
                java.security.cert.X509Certificate[] certs, String authType)
                
 
throws java.security.cert.CertificateException {
            return;
        }
        public void checkClientTrusted(
                java.security.cert.X509Certificate[] certs, String authType)
                throws java.security.cert.CertificateException {
            return;
        }
    }

　　public
 
 static void main(String[] args) throws Exception {
        javax.net.ssl.TrustManager[] trustAllCerts = new javax.net.ssl.TrustManager[1];
        javax.net.ssl.TrustManager tm = new MyTM();
        trustAllCerts[0] = tm;
        javax.net.ssl.SSLContext sc = javax.net.ssl.SSLContext
                .getInstance("SSL");
        sc.init(null, trustAllCerts, null);
        javax.net.ssl.HttpsURLConnection.setDefaultSSLSocketFactory(sc
                .getSocketFactory());
    }