前段时间开发的一个需求，需要通过图片URL获取图片的base64编码，测试的时候使用的是百度图片的url，测试没有问题，但是发布后测试时报如下错：

javax.net.ssl.sslhandshakeException:sun.security.validator.validatorException:PKIX path buildind failed

报错代码：

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.Base64;

public class Base64Util {

    private static final Logger logger = LoggerFactory.getLogger(Base64Util.class);

    public static String getBase64ByUrl(String urlPath){
        ByteArrayOutputStream data = new ByteArrayOutputStream();
        try {
            URL url = new URL(urlPath);
            byte[] by = new byte[1024];
            URLConnection urlConnection = url.openConnection();
            HttpURLConnection httpURLConnection = (HttpURLConnection) urlConnection;
            httpURLConnection.setConnectTimeout(1000*5);
            httpURLConnection.connect();
            InputStream inputStream = httpURLConnection.getInputStream();
            int len = -1;
            while ( (len = inputStream.read(by)) !=-1){
                data.write(by,0,len);
            }
            inputStream.close();
        } catch (Exception e) {
            logger.error("获取图片base64出错：" + e + ",图片url为：" + urlPath);
        }
        return Base64.getMimeEncoder().encodeToString(data.toByteArray());
    }
}

检查发现是jdk的证书库里并没有将该站点的证书作为受信任的安全证书，只要在打开链接的时候设置忽略证书检查就可以解决，更新代码如下：

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLSession;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.Base64;

public class Base64Util {

    private static final Logger logger = LoggerFactory.getLogger(Base64Util.class);

    public static String getBase64ByUrl(String urlPath){
        ByteArrayOutputStream data = new ByteArrayOutputStream();
        try {
            HostnameVerifier hv = new HostnameVerifier() {
                public boolean verify(String urlHostName, SSLSession session) {
                    System.out.println("Warning: URL Host: " + urlHostName + " vs. "
                            + session.getPeerHost());
                    return true;
                }
            };
            URL url = new URL(urlPath);
            byte[] by = new byte[1024];
            //忽略证书信任
            trustAllHttpsCertificates();
            HttpsURLConnection.setDefaultHostnameVerifier(hv);
            URLConnection urlConnection = url.openConnection();
            HttpURLConnection httpURLConnection = (HttpURLConnection) urlConnection;
            httpURLConnection.setConnectTimeout(1000*5);
            httpURLConnection.connect();
            InputStream inputStream = httpURLConnection.getInputStream();
            int len = -1;
            while ( (len = inputStream.read(by)) !=-1){
                data.write(by,0,len);
            }
            inputStream.close();
        } catch (Exception e) {
            logger.error("获取图片base64出错：" + e + ",图片url为：" + urlPath);
        }
        return Base64.getMimeEncoder().encodeToString(data.toByteArray());
    }

    private static void trustAllHttpsCertificates() throws Exception {
        javax.net.ssl.TrustManager[] trustAllCerts = new javax.net.ssl.TrustManager[1];
        javax.net.ssl.TrustManager tm = new miTM();
        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());
    }

    static class miTM 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;
        }
    }
}

在URLConnection urlConnection = url.openConnection();之前忽略证书信任，问题解决。