Example usage for java.net URLConnection setAllowUserInteraction

List of usage examples for java.net URLConnection setAllowUserInteraction

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Introduction

In this page you can find the example usage for java.net URLConnection setAllowUserInteraction.

Prototype

public void setAllowUserInteraction(boolean allowuserinteraction)

Source Link

Document

Set the value of the allowUserInteraction field of this URLConnection .

Usage

From source file:com.iskyshop.manage.seller.action.OrderSellerAction.java

private TransInfo query_ship_getData(String id) {
    TransInfo info = new TransInfo();
    OrderForm obj = this.orderFormService.getObjById(CommUtil.null2Long(id));
    try {//from   ww  w. ja v  a2 s. c  om
        ExpressCompany ec = this.queryExpressCompany(obj.getExpress_info());
        URL url = new URL("http://api.kuaidi100.com/api?id=" + this.configService.getSysConfig().getKuaidi_id()
                + "&com=" + (ec != null ? ec.getCompany_mark() : "") + "&nu=" + obj.getShipCode()
                + "&show=0&muti=1&order=asc");
        URLConnection con = url.openConnection();
        con.setAllowUserInteraction(false);
        InputStream urlStream = url.openStream();
        String type = con.guessContentTypeFromStream(urlStream);
        String charSet = null;
        if (type == null)
            type = con.getContentType();
        if (type == null || type.trim().length() == 0 || type.trim().indexOf("text/html") < 0)
            return info;
        if (type.indexOf("charset=") > 0)
            charSet = type.substring(type.indexOf("charset=") + 8);
        byte b[] = new byte[10000];
        int numRead = urlStream.read(b);
        String content = new String(b, 0, numRead, charSet);
        while (numRead != -1) {
            numRead = urlStream.read(b);
            if (numRead != -1) {
                // String newContent = new String(b, 0, numRead);
                String newContent = new String(b, 0, numRead, charSet);
                content += newContent;
            }
        }
        info = Json.fromJson(TransInfo.class, content);
        urlStream.close();
    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return info;
}

From source file:org.signserver.client.cli.validationservice.ValidateCertificateCommand.java

private ValidateResponse runHTTP(final X509Certificate cert) throws Exception {

    final URL processServlet = new URL(useSSL ? "https" : "http", hosts[0], port, servlet);

    OutputStream out = null;//from ww  w. j a v a 2s .  c  o  m
    InputStream in = null;

    try {
        final URLConnection conn = processServlet.openConnection();

        conn.setDoOutput(true);
        conn.setAllowUserInteraction(false);

        final StringBuilder sb = new StringBuilder();
        sb.append("--" + BOUNDARY);
        sb.append(CRLF);

        try {
            final int workerId = Integer.parseInt(service);

            sb.append("Content-Disposition: form-data; name=\"workerId\"");
            sb.append(CRLF);
            sb.append(CRLF);
            sb.append(workerId);
        } catch (NumberFormatException e) {
            sb.append("Content-Disposition: form-data; name=\"workerName\"");
            sb.append(CRLF);
            sb.append(CRLF);
            sb.append(service);
        }

        sb.append(CRLF);
        sb.append("--" + BOUNDARY);
        sb.append(CRLF);

        sb.append("Content-Disposition: form-data; name=\"processType\"");
        sb.append(CRLF);
        sb.append(CRLF);
        sb.append("validateCertificate");
        sb.append(CRLF);
        sb.append("--" + BOUNDARY);
        sb.append(CRLF);
        sb.append("Content-Disposition: form-data; name=\"datafile\"");
        sb.append("; filename=\"");
        sb.append(certPath.getAbsolutePath());
        sb.append("\"");
        sb.append(CRLF);

        sb.append("Content-Type: application/octet-stream");
        sb.append(CRLF);
        sb.append("Content-Transfer-Encoding: binary");
        sb.append(CRLF);
        sb.append(CRLF);

        conn.addRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);

        out = conn.getOutputStream();

        out.write(sb.toString().getBytes());

        out.write(cert.getEncoded());

        out.write(("\r\n--" + BOUNDARY + "--\r\n").getBytes());
        out.flush();

        // Get the response
        in = conn.getInputStream();
        final ByteArrayOutputStream os = new ByteArrayOutputStream();
        int len;
        final byte[] buf = new byte[1024];
        while ((len = in.read(buf)) > 0) {
            os.write(buf, 0, len);
        }
        os.close();

        // read string from response
        final String response = os.toString();
        final String[] responseParts = response.split(";");

        // last part of the response string can by empty (revocation date)
        if (responseParts.length < 4 || responseParts.length > 5) {
            throw new IOException("Malformed HTTP response");
        }

        final String revocationDateString = responseParts.length == 4 ? null : responseParts[4];
        final Date revocationDate = revocationDateString != null && revocationDateString.length() > 0
                ? new Date(Integer.valueOf(revocationDateString))
                : null;
        final Validation validation = new Validation(cert, null, Validation.Status.valueOf(responseParts[0]),
                responseParts[2], revocationDate, Integer.valueOf(responseParts[3]));
        final ValidateResponse validateResponse = new ValidateResponse(validation, responseParts[1].split(","));

        return validateResponse;
    } catch (IOException e) {
        throw new RuntimeException(e);
    } finally {
        if (out != null) {
            try {
                out.close();
            } catch (IOException ex) {
                throw new RuntimeException(ex);
            }
        }
        if (in != null) {
            try {
                in.close();
            } catch (IOException ex) {
                throw new RuntimeException(ex);
            }
        }
    }
}

From source file:org.openqa.selenium.server.ProxyHandler.java

protected long proxyPlainTextRequest(URL url, String pathInContext, String pathParams, HttpRequest request,
        HttpResponse response) throws IOException {
    CaptureNetworkTrafficCommand.Entry entry = new CaptureNetworkTrafficCommand.Entry(request.getMethod(),
            url.toString());//www.j  a v  a 2s .  c o  m
    entry.addRequestHeaders(request);

    if (log.isDebugEnabled())
        log.debug("PROXY URL=" + url);

    URLConnection connection = url.openConnection();
    connection.setAllowUserInteraction(false);

    if (proxyInjectionMode) {
        adjustRequestForProxyInjection(request, connection);
    }

    // Set method
    HttpURLConnection http = null;
    if (connection instanceof HttpURLConnection) {
        http = (HttpURLConnection) connection;
        http.setRequestMethod(request.getMethod());
        http.setInstanceFollowRedirects(false);
        if (trustAllSSLCertificates && connection instanceof HttpsURLConnection) {
            TrustEverythingSSLTrustManager.trustAllSSLCertificates((HttpsURLConnection) connection);
        }
    }

    // check connection header
    String connectionHdr = request.getField(HttpFields.__Connection);
    if (connectionHdr != null && (connectionHdr.equalsIgnoreCase(HttpFields.__KeepAlive)
            || connectionHdr.equalsIgnoreCase(HttpFields.__Close)))
        connectionHdr = null;

    // copy headers
    boolean xForwardedFor = false;
    boolean isGet = "GET".equals(request.getMethod());
    boolean hasContent = false;
    Enumeration enm = request.getFieldNames();
    while (enm.hasMoreElements()) {
        // TODO could be better than this!
        String hdr = (String) enm.nextElement();

        if (_DontProxyHeaders.containsKey(hdr) || !_chained && _ProxyAuthHeaders.containsKey(hdr))
            continue;
        if (connectionHdr != null && connectionHdr.indexOf(hdr) >= 0)
            continue;

        if (!isGet && HttpFields.__ContentType.equals(hdr))
            hasContent = true;

        Enumeration vals = request.getFieldValues(hdr);
        while (vals.hasMoreElements()) {
            String val = (String) vals.nextElement();
            if (val != null) {
                // don't proxy Referer headers if the referer is Selenium!
                if ("Referer".equals(hdr) && (-1 != val.indexOf("/selenium-server/"))) {
                    continue;
                }
                if (!isGet && HttpFields.__ContentLength.equals(hdr) && Integer.parseInt(val) > 0) {
                    hasContent = true;
                }

                connection.addRequestProperty(hdr, val);
                xForwardedFor |= HttpFields.__XForwardedFor.equalsIgnoreCase(hdr);
            }
        }
    }

    // add any custom request headers that the user asked for
    Map<String, String> customRequestHeaders = AddCustomRequestHeaderCommand.getHeaders();
    for (Map.Entry<String, String> e : customRequestHeaders.entrySet()) {
        connection.addRequestProperty(e.getKey(), e.getValue());
        entry.addRequestHeader(e.getKey(), e.getValue());
    }

    // Proxy headers
    if (!_anonymous)
        connection.setRequestProperty("Via", "1.1 (jetty)");
    if (!xForwardedFor)
        connection.addRequestProperty(HttpFields.__XForwardedFor, request.getRemoteAddr());

    // a little bit of cache control
    String cache_control = request.getField(HttpFields.__CacheControl);
    if (cache_control != null
            && (cache_control.indexOf("no-cache") >= 0 || cache_control.indexOf("no-store") >= 0))
        connection.setUseCaches(false);

    // customize Connection
    customizeConnection(pathInContext, pathParams, request, connection);

    try {
        connection.setDoInput(true);

        // do input thang!
        InputStream in = request.getInputStream();
        if (hasContent) {
            connection.setDoOutput(true);
            IO.copy(in, connection.getOutputStream());
        }

        // Connect
        connection.connect();
    } catch (Exception e) {
        LogSupport.ignore(log, e);
    }

    InputStream proxy_in = null;

    // handler status codes etc.
    int code = -1;
    if (http != null) {
        proxy_in = http.getErrorStream();

        try {
            code = http.getResponseCode();
        } catch (SSLHandshakeException e) {
            throw new RuntimeException("Couldn't establish SSL handshake.  Try using trustAllSSLCertificates.\n"
                    + e.getLocalizedMessage(), e);
        }
        response.setStatus(code);
        response.setReason(http.getResponseMessage());

        String contentType = http.getContentType();
        if (log.isDebugEnabled()) {
            log.debug("Content-Type is: " + contentType);
        }
    }

    if (proxy_in == null) {
        try {
            proxy_in = connection.getInputStream();
        } catch (Exception e) {
            LogSupport.ignore(log, e);
            proxy_in = http.getErrorStream();
        }
    }

    // clear response defaults.
    response.removeField(HttpFields.__Date);
    response.removeField(HttpFields.__Server);

    // set response headers
    int h = 0;
    String hdr = connection.getHeaderFieldKey(h);
    String val = connection.getHeaderField(h);
    while (hdr != null || val != null) {
        if (hdr != null && val != null && !_DontProxyHeaders.containsKey(hdr)
                && (_chained || !_ProxyAuthHeaders.containsKey(hdr)))
            response.addField(hdr, val);
        h++;
        hdr = connection.getHeaderFieldKey(h);
        val = connection.getHeaderField(h);
    }
    if (!_anonymous)
        response.setField("Via", "1.1 (jetty)");

    response.removeField(HttpFields.__ETag); // possible cksum?  Stop caching...
    response.removeField(HttpFields.__LastModified); // Stop caching...

    // Handled
    long bytesCopied = -1;
    request.setHandled(true);
    if (proxy_in != null) {
        boolean injectableResponse = http.getResponseCode() == HttpURLConnection.HTTP_OK
                || (http.getResponseCode() >= 400 && http.getResponseCode() < 600);
        if (proxyInjectionMode && injectableResponse) {
            // check if we should proxy this path based on the dontProxyRegex that can be user-specified
            if (shouldInject(request.getPath())) {
                bytesCopied = InjectionHelper.injectJavaScript(request, response, proxy_in,
                        response.getOutputStream(), debugURL);
            } else {
                bytesCopied = ModifiedIO.copy(proxy_in, response.getOutputStream());
            }
        } else {
            bytesCopied = ModifiedIO.copy(proxy_in, response.getOutputStream());
        }
    }

    entry.finish(code, bytesCopied);
    entry.addResponseHeader(response);

    CaptureNetworkTrafficCommand.capture(entry);

    return bytesCopied;
}

From source file:org.lockss.proxy.ProxyHandler.java

/** Proxy a connection using Java's native URLConection */
void doSun(String pathInContext, String pathParams, HttpRequest request, HttpResponse response)
        throws IOException {
    URI uri = request.getURI();/*www  .  ja v a2  s  .co  m*/
    try {
        // Do we proxy this?
        URL url = isProxied(uri);
        if (url == null) {
            if (isForbidden(uri)) {
                sendForbid(request, response, uri);
                logAccess(request, "forbidden method: " + request.getMethod());
            }
            return;
        }

        if (jlog.isDebugEnabled())
            jlog.debug("PROXY URL=" + url);

        URLConnection connection = url.openConnection();
        connection.setAllowUserInteraction(false);

        // Set method
        HttpURLConnection http = null;
        if (connection instanceof HttpURLConnection) {
            http = (HttpURLConnection) connection;
            http.setRequestMethod(request.getMethod());
            http.setInstanceFollowRedirects(false);
        }

        // check connection header
        String connectionHdr = request.getField(HttpFields.__Connection);
        if (connectionHdr != null && (connectionHdr.equalsIgnoreCase(HttpFields.__KeepAlive)
                || connectionHdr.equalsIgnoreCase(HttpFields.__Close)))
            connectionHdr = null;

        // copy headers
        boolean hasContent = false;
        Enumeration en = request.getFieldNames();

        while (en.hasMoreElements()) {
            // XXX could be better than this!
            String hdr = (String) en.nextElement();

            if (_DontProxyHeaders.containsKey(hdr))
                continue;

            if (connectionHdr != null && connectionHdr.indexOf(hdr) >= 0)
                continue;

            if (HttpFields.__ContentType.equalsIgnoreCase(hdr))
                hasContent = true;

            Enumeration vals = request.getFieldValues(hdr);
            while (vals.hasMoreElements()) {
                String val = (String) vals.nextElement();
                if (val != null) {
                    connection.addRequestProperty(hdr, val);
                }
            }
        }

        // Proxy headers
        connection.addRequestProperty(HttpFields.__Via, makeVia(request));
        connection.addRequestProperty(HttpFields.__XForwardedFor, request.getRemoteAddr());
        // a little bit of cache control
        String cache_control = request.getField(HttpFields.__CacheControl);
        if (cache_control != null
                && (cache_control.indexOf("no-cache") >= 0 || cache_control.indexOf("no-store") >= 0))
            connection.setUseCaches(false);

        // customize Connection
        customizeConnection(pathInContext, pathParams, request, connection);

        try {
            connection.setDoInput(true);

            // do input thang!
            InputStream in = request.getInputStream();
            if (hasContent) {
                connection.setDoOutput(true);
                IO.copy(in, connection.getOutputStream());
            }

            // Connect
            connection.connect();
        } catch (Exception e) {
            LogSupport.ignore(jlog, e);
        }

        InputStream proxy_in = null;

        // handler status codes etc.
        int code = HttpResponse.__500_Internal_Server_Error;
        if (http != null) {
            proxy_in = http.getErrorStream();

            code = http.getResponseCode();
            response.setStatus(code);
            response.setReason(http.getResponseMessage());
        }

        if (proxy_in == null) {
            try {
                proxy_in = connection.getInputStream();
            } catch (Exception e) {
                LogSupport.ignore(jlog, e);
                proxy_in = http.getErrorStream();
            }
        }

        // clear response defaults.
        response.removeField(HttpFields.__Date);
        response.removeField(HttpFields.__Server);

        // set response headers
        int h = 0;
        String hdr = connection.getHeaderFieldKey(h);
        String val = connection.getHeaderField(h);
        while (hdr != null || val != null) {
            if (hdr != null && val != null && !_DontProxyHeaders.containsKey(hdr))
                response.addField(hdr, val);
            h++;
            hdr = connection.getHeaderFieldKey(h);
            val = connection.getHeaderField(h);
        }
        response.addField(HttpFields.__Via, makeVia(request));

        // Handled
        request.setHandled(true);
        if (proxy_in != null)
            IO.copy(proxy_in, response.getOutputStream());

    } catch (Exception e) {
        log.warning("doSun error", e);
        if (!response.isCommitted())
            response.sendError(HttpResponse.__400_Bad_Request, e.getMessage());
    }
}

From source file:org.sbs.util.download.MultiThreadDownload.java

/**
 * /*from   w ww. j  a  va2s  .  c  o  m*/
 * @param url
 * @param path
 * @param fileName
 * @return
 * @throws DownLoadException
 */
@SuppressWarnings("unchecked")
public File downLoad(final URL url, String path, String fileName) throws DownLoadException {
    // ??
    this.downLen = -1;
    this.contentLen = 0;
    this.date = new Date();
    this.finished = false;
    try {
        URLConnection con = url.openConnection();
        //?
        this.contentLen = con.getContentLength();
        //??
        if (StringUtils.isBlank(fileName)) {
            fileName = StringUtils.substringAfterLast(url.getPath(), "/");
        }
        //
        File _path = new File(path);
        if (!_path.exists()) {
            _path.mkdirs();
        }
        final File file = new File(path + File.separator + fileName);
        if (file.exists())
            file.delete();
        if (this.threadNum == 0 && this.blockSize > 0) {
            this.threadNum = (int) (contentLen / blockSize);
            if (this.threadNum == 0) {
                this.threadNum = 1;
            }
        }
        long subLen = contentLen / threadNum;
        List<Future<DownLoadBean>> result = Lists.newArrayList();
        for (int i = 0; i < threadNum; i++) {
            final int pos = (int) (i * subLen);
            final int end = (int) ((i + 1) * subLen) - 1;
            final int current = pos;
            Future<DownLoadBean> f = (Future<DownLoadBean>) pool.submit(new Callable<DownLoadBean>() {
                int $pos = pos;
                int $end = end;
                int $current = current;

                @Override
                public DownLoadBean call() throws Exception {
                    //buff
                    BufferedInputStream bis = null;
                    RandomAccessFile fos = null;
                    byte[] buf = new byte[BUFFER_SIZE];
                    URLConnection con = null;
                    try {
                        con = url.openConnection();
                        con.setAllowUserInteraction(true);
                        //???startPosendPos
                        con.setRequestProperty("Range", "bytes=" + $pos + "-" + $end);
                        fos = new RandomAccessFile(file, "rw");
                        //startPos
                        fos.seek($pos);
                        //????curPos???endPos
                        //endPos?
                        bis = new BufferedInputStream(con.getInputStream());
                        while ($current < $end) {
                            int len = bis.read(buf, 0, BUFFER_SIZE);
                            if (len == -1) {
                                break;
                            }
                            fos.write(buf, 0, len);
                            $current = $current + len;
                            if ($current - 1 > $end) {
                                throw new DownLoadException(
                                        "????");
                            }
                            addLen(len);
                        }
                        bis.close();
                        fos.close();
                    } catch (IOException ex) {
                        /* ?????
                        StringBuffer sb = new StringBuffer();
                        sb.append($pos).append("\t").append($current).append("\t").append($end).append("\n");
                         FileUtils.write(new File(file.getAbsolutePath()+".pos"), sb, true);
                         */
                        throw new RuntimeException(ex);
                    }
                    log.debug(this.hashCode() + ":??[" + $pos + "," + $end + "]");
                    return new DownLoadBean($pos, $end, $current);
                }
            });
            result.add(f);
        }
        Long resultTotal = 0L;
        for (Future<DownLoadBean> f : result) {
            DownLoadBean dInfo = f.get();
            resultTotal += dInfo.getCurrent() - dInfo.getPos();
        }
        // ?
        if (contentLen > resultTotal + 1) {
            // ???
            FileUtils.write(new File(down_error_log_file), url.toString() + "\n", true);
            throw new DownLoadException("?");
        } else {
            finished = true;
            return file;
        }
    } catch (IOException | InterruptedException | ExecutionException e) {
        // 
        try {
            FileUtils.write(new File(down_error_log_file), url.toString() + "\n", true);
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        e.printStackTrace();
    }
    return null;
}

From source file:com.iskyshop.manage.buyer.action.OrderBuyerAction.java

private TransInfo query_Returnship_getData(String id) {
    TransInfo info = new TransInfo();
    ReturnGoodsLog obj = this.returnGoodsLogService.getObjById(CommUtil.null2Long(id));
    try {/*from   w  w w.  ja v a  2s .c  o m*/
        ExpressCompany ec = this.queryExpressCompany(obj.getReturn_express_info());
        String query_url = "http://api.kuaidi100.com/api?id=" + this.configService.getSysConfig().getKuaidi_id()
                + "&com=" + (ec != null ? ec.getCompany_mark() : "") + "&nu=" + obj.getExpress_code()
                + "&show=0&muti=1&order=asc";
        URL url = new URL(query_url);
        URLConnection con = url.openConnection();
        con.setAllowUserInteraction(false);
        InputStream urlStream = url.openStream();
        String type = con.guessContentTypeFromStream(urlStream);
        String charSet = null;
        if (type == null)
            type = con.getContentType();
        if (type == null || type.trim().length() == 0 || type.trim().indexOf("text/html") < 0)
            return info;
        if (type.indexOf("charset=") > 0)
            charSet = type.substring(type.indexOf("charset=") + 8);
        byte b[] = new byte[10000];
        int numRead = urlStream.read(b);
        String content = new String(b, 0, numRead, charSet);
        while (numRead != -1) {
            numRead = urlStream.read(b);
            if (numRead != -1) {
                // String newContent = new String(b, 0, numRead);
                String newContent = new String(b, 0, numRead, charSet);
                content += newContent;
            }
        }
        info = Json.fromJson(TransInfo.class, content);
        urlStream.close();
    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return info;
}

From source file:com.iskyshop.manage.buyer.action.OrderBuyerAction.java

private TransInfo query_ship_getData(String id) {
    TransInfo info = null;//from w  w  w  . j a  v  a  2  s  . c  om
    OrderForm obj = this.orderFormService.getObjById(CommUtil.null2Long(id));
    if (obj != null && !CommUtil.null2String(obj.getShipCode()).equals("")) {
        info = new TransInfo();
        try {
            ExpressCompany ec = this.queryExpressCompany(obj.getExpress_info());
            String query_url = "http://api.kuaidi100.com/api?id="
                    + this.configService.getSysConfig().getKuaidi_id() + "&com="
                    + (ec != null ? ec.getCompany_mark() : "") + "&nu=" + obj.getShipCode()
                    + "&show=0&muti=1&order=asc";
            URL url = new URL(query_url);
            URLConnection con = url.openConnection();
            con.setAllowUserInteraction(false);
            InputStream urlStream = url.openStream();
            String type = con.guessContentTypeFromStream(urlStream);
            String charSet = null;
            if (type == null)
                type = con.getContentType();
            if (type == null || type.trim().length() == 0 || type.trim().indexOf("text/html") < 0)
                return info;
            if (type.indexOf("charset=") > 0)
                charSet = type.substring(type.indexOf("charset=") + 8);
            byte b[] = new byte[10000];
            int numRead = urlStream.read(b);
            String content = new String(b, 0, numRead, charSet);
            while (numRead != -1) {
                numRead = urlStream.read(b);
                if (numRead != -1) {
                    // String newContent = new String(b, 0, numRead);
                    String newContent = new String(b, 0, numRead, charSet);
                    content += newContent;
                }
            }
            info = Json.fromJson(TransInfo.class, content);
            urlStream.close();
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return info;
}

From source file:com.amalto.workbench.utils.Util.java

public static String getResponseFromURL(String url, TreeObject treeObj) throws Exception {
    InputStreamReader doc = null;
    try {//from w  ww .  j a v a  2s.c o  m
        Encoder encoder = Base64.getEncoder();
        StringBuffer buffer = new StringBuffer();
        String credentials = encoder.encodeToString((new String(treeObj.getServerRoot().getUsername() + ":"//$NON-NLS-1$
                + treeObj.getServerRoot().getPassword()).getBytes()));

        URL urlCn = new URL(url);
        URLConnection conn = urlCn.openConnection();
        conn.setAllowUserInteraction(true);
        conn.setDoOutput(true);
        conn.setDoInput(true);
        conn.setRequestProperty("Authorization", "Basic " + credentials);//$NON-NLS-1$//$NON-NLS-2$
        conn.setRequestProperty("Expect", "100-continue");//$NON-NLS-1$//$NON-NLS-2$

        doc = new InputStreamReader(conn.getInputStream());
        BufferedReader reader = new BufferedReader(doc);
        String line = reader.readLine();
        while (line != null) {
            buffer.append(line);
            line = reader.readLine();
        }

        return buffer.toString();
    } finally {
        if (doc != null) {
            doc.close();
        }
    }
}