基于http 和 https的文件下载

小咪咪 2022-07-16 00:55 160阅读 0赞

1.基于http下载

//url为文件在服务器上的详细路径
            URL url = new URL("brook.com\Plugin_ngCUTE.xlsm");
            本地路径
            File dist = new File("D:\\Plugin_ngCUTE.xlsm");
            FileUtils.copyFile(url.openStream(), dist);
    
    public class FileUtils{
        public static final void copyFile(final InputStream in, final File dst) throws IOException
        {
            final OutputStream out = new FileOutputStream(dst);
            copyFile(in, out);
        }
            public static void copyFile(final InputStream in, final OutputStream out)
                throws IOException {
            final byte[] buf = new byte[1024];
            int len;
            while ((len = in.read(buf)) > 0)
            {
                out.write(buf, 0, len);
            }
            in.close();
            out.close();
        }
    
    }

2.https

public static void downloadFile(String url, String path, String fileName) throws Exception {
            log.debug("path:" + path);
            log.debug("url:" + url);
    
            HttpClient client = null;
            try {
                client = getHttpClient();
    
                HttpGet httpGet = getHttpGet(url, null, null);
                HttpResponse response = client.execute(httpGet);
                if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                    byte[] result = EntityUtils.toByteArray(response.getEntity());
                    BufferedOutputStream bw = null;
                    try {
                        File f = new File(path + "/" + fileName);
                        if (!f.getParentFile().exists())
                            f.getParentFile().mkdirs();
                        bw = new BufferedOutputStream(new FileOutputStream(f));
                        bw.write(result);
                    } catch (IOException e) {
                        log.error("Error saving file,path=" + path + ",url=" + url, e);
                        throw e;
                    } finally {
                        if (bw != null)
                            bw.close();
                    }
                }
                else {
                    StringBuffer errorMsg = new StringBuffer();
                    errorMsg.append("httpStatus:");
                    errorMsg.append(response.getStatusLine().getStatusCode());
                    errorMsg.append(response.getStatusLine().getReasonPhrase());
                    errorMsg.append(", Header: ");
                    Header[] headers = response.getAllHeaders();
                    for (Header header : headers) {
                        errorMsg.append(header.getName());
                        errorMsg.append(":");
                        errorMsg.append(header.getValue());
                    }
                    log.error("HttpResonse Error:" + errorMsg);
                    throw new HttpResponseException("HttpResonse Error:" + errorMsg);
                }
            } catch (ClientProtocolException e) {
                log.error("Download the files saved to the local,http Connection exception,path=" + path + ",url=" + url, e);
                throw e;
            } catch (IOException e) {
    
    
    
    
    
    
                log.error("Download the files saved to the local,File operations abnormal,path=" + path + ",url=" + url, e);
                throw e;
            } finally {
                client.getConnectionManager().shutdown();
            }
        }
    public static HttpClient getHttpClient() throws Exception{
            HttpClient httpclient = null;
    
    
            SSLContext sslContext;
            try {
                sslContext = SSLContext.getInstance("SSL");
    
    
            // set up a TrustManager that trusts everything
            sslContext.init(null, new TrustManager[] { new X509TrustManager() {
                public X509Certificate[] getAcceptedIssuers() {
                    System.out.println("getAcceptedIssuers =============");
                    return null;
                }
    
                public void checkClientTrusted(X509Certificate[] certs, String authType) {
                    System.out.println("checkClientTrusted =============");
                }
    
                public void checkServerTrusted(X509Certificate[] certs, String authType) {
                    System.out.println("checkServerTrusted =============");
                }
            } }, new SecureRandom());
    
            SSLSocketFactory sf = new SSLSocketFactory(sslContext);
            Scheme httpsScheme = new Scheme(getProperties().getProperty(TYPE), new Integer(getProperties().getProperty(PORT)) , sf);
            SchemeRegistry schemeRegistry = new SchemeRegistry();
            schemeRegistry.register(httpsScheme);
    
            // apache HttpClient version >4.2 should use
            // BasicClientConnectionManager
            ClientConnectionManager cm = new SingleClientConnManager(schemeRegistry);
            httpclient = new DefaultHttpClient(cm);
    
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                throw e;
            }
            return httpclient;
    
        }