https 文件下載工具類

 根據url下載文件

import lombok.extern.slf4j.Slf4j;

import javax.net.ssl.*;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;


@Slf4j
public class DownloadUtil {

    /**
     *
     * @param fileUrl   遠程地址
     * @throws Exception
     */
    public static byte[] downloadFile(String fileUrl) throws Exception {
        InputStream in = null;
        ByteArrayOutputStream bos = null;
        try{
            SSLContext sslcontext = SSLContext.getInstance("SSL", "SunJSSE");
            sslcontext.init(null, new TrustManager[] { new DownloadUtil.X509TrustUtiil() }, new java.security.SecureRandom());
            URL url = new URL(fileUrl);
            HostnameVerifier ignoreHostnameVerifier = new HostnameVerifier() {
                public boolean verify(String s, SSLSession sslsession) {
                    log.warn("WARNING: Hostname is not matched for cert.");
                    return true;
                }
            };
            HttpsURLConnection.setDefaultHostnameVerifier(ignoreHostnameVerifier);
            HttpsURLConnection.setDefaultSSLSocketFactory(sslcontext.getSocketFactory());
            HttpsURLConnection urlCon = (HttpsURLConnection) url.openConnection();
            urlCon.setConnectTimeout(6000);
            urlCon.setReadTimeout(6000);
            int code = urlCon.getResponseCode();
            if (code != HttpURLConnection.HTTP_OK) {
                log.warn("DownloadUtil downloadFile 文件讀取失敗");
                throw new Exception("文件讀取失敗");
            }
            // 讀文件流
            in = urlCon.getInputStream();
            bos = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024];
            int len = 0;
            while ((len = in.read(buffer)) != -1) {
                bos.write(buffer, 0, len);
            }
            return bos.toByteArray();
        }catch (Exception e){
            throw e;
        }finally {
            if(null != in) in.close();
            if(null != bos) bos.close();
        }
    }

    public static class X509TrustUtiil implements X509TrustManager{

        @Override
        public void checkClientTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {

        }

        @Override
        public void checkServerTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {

        }

        @Override
        public X509Certificate[] getAcceptedIssuers() {
            return new X509Certificate[0];
        }
    }
}