基于http 和 https的文件下载

来源：互联网发布：网络红歌2016 编辑：程序博客网时间：2024/06/07 15:01

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;    }

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