java.net.URLConnection.getContentLength()方法的使用及代码示例

x33g5p2x  于2022-01-31 转载在 其他  
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本文整理了Java中java.net.URLConnection.getContentLength()方法的一些代码示例，展示了URLConnection.getContentLength()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。URLConnection.getContentLength()方法的具体详情如下：
包路径：java.net.URLConnection
类名称：URLConnection
方法名：getContentLength

URLConnection.getContentLength介绍

[英]Returns the content length in bytes specified by the response header field content-length or -1 if this field is not set.
[中]返回响应头字段content length指定的内容长度（字节），如果未设置此字段，则返回-1。

代码示例

代码示例来源：origin: stackoverflow.com

  1. HttpURLConnection connection = null;
  2. try {
  3.   URL url = new URL(sUrl[0]);
  4.   connection = (HttpURLConnection) url.openConnection();
  5.   connection.connect();
  6.   int fileLength = connection.getContentLength();
  7.   input = connection.getInputStream();
  8.   output = new FileOutputStream("/sdcard/file_name.extension");
  9.   while ((count = input.read(data)) != -1) {

代码示例来源：origin: wiztools/rest-client

  1. private void init() throws IOException {
  2.   if(is == null && length == 0) {
  3.     URLConnection con = url.openConnection();
  4.     is = con.getInputStream();
  5.     length = con.getContentLength();
  6.   }
  7. }

代码示例来源：origin: perwendel/spark

  1. @Override
  2. public long contentLength() throws IOException {
  3.   URL url = getURL();
  4.   if (ResourceUtils.isFileURL(url)) {
  5.     // Proceed with file system resolution...
  6.     return getFile().length();
  7.   } else {
  8.     // Try a URL connection content-length header...
  9.     URLConnection con = url.openConnection();
  10.     customizeConnection(con);
  11.     return con.getContentLength();
  12.   }
  13. }

代码示例来源：origin: bytedeco/javacpp

  1. String s = System.getProperty("org.bytedeco.javacpp.cachedir.nosubdir", "false").toLowerCase();
  2. boolean noSubdir = s.equals("true") || s.equals("t") || s.equals("");
  3. URLConnection urlConnection = resourceURL.openConnection();
  4. if (urlConnection instanceof JarURLConnection) {
  5.   JarFile jarFile = ((JarURLConnection)urlConnection).getJarFile();
  6.   size = urlConnection.getContentLength();
  7.   timestamp = urlConnection.getLastModified();
  8.   if (!noSubdir) {
  9.         logger.debug("Locking " + cacheDir + " to create symbolic link");
  10.       lockChannel = new FileOutputStream(lockFile).getChannel();
  11.       lock = lockChannel.lock();
  12.       if ((!file.exists() || !Files.isSymbolicLink(path) || !Files.readSymbolicLink(path).equals(targetPath))
  13.           logger.debug("Locking " + cacheDir + " to create symbolic link");
  14.         lockChannel = new FileOutputStream(lockFile).getChannel();
  15.         lock = lockChannel.lock();
  16.         if ((!file.exists() || !Files.isSymbolicLink(path) || !Files.readSymbolicLink(path).equals(urlPath))
  17.         logger.debug("Locking " + cacheDir + " before extracting");
  18.       lockChannel = new FileOutputStream(lockFile).getChannel();
  19.       lock = lockChannel.lock();

代码示例来源：origin: spotbugs/spotbugs

  1. if (sampleURL != null) {
  2.   try {
  3.     URL u = new URL(sampleURL);
  4.     writer.println("Checking access to " + u);
  5.     URLConnection c = u.openConnection();
  6.     writer.println("Content type: " + c.getContentType());
  7.     writer.println("Content length: " + c.getContentLength());
  8.   } catch (Throwable e) {
  9.     e.printStackTrace(writer);

代码示例来源：origin: stackoverflow.com

  1. ResultReceiver receiver = (ResultReceiver) intent.getParcelableExtra("receiver");
  2. try {
  3.   URL url = new URL(urlToDownload);
  4.   URLConnection connection = url.openConnection();
  5.   connection.connect();
  6.   int fileLength = connection.getContentLength();
  7.   InputStream input = new BufferedInputStream(connection.getInputStream());
  8.   OutputStream output = new FileOutputStream("/sdcard/BarcodeScanner-debug.apk");
  9.   while ((count = input.read(data)) != -1) {
  10.     total += count;

代码示例来源：origin: stackoverflow.com

  1. private int tryGetFileSize(URL url) {
  2.    HttpURLConnection conn = null;
  3.    try {
  4.      conn = (HttpURLConnection) url.openConnection();
  5.      conn.setRequestMethod("HEAD");
  6.      conn.getInputStream();
  7.      return conn.getContentLength();
  8.    } catch (IOException e) {
  9.      return -1;
  10.    } finally {
  11.      conn.disconnect();
  12.    }
  13.  }

代码示例来源：origin: deeplearning4j/nd4j

  1. public long contentLength() throws IOException {
  2.   URL url = this.getURL();
  3.   if (ResourceUtils.isFileURL(url)) {
  4.     return this.getFile().length();
  5.   } else {
  6.     URLConnection con = url.openConnection();
  7.     ResourceUtils.useCachesIfNecessary(con);
  8.     if (con instanceof HttpURLConnection) {
  9.       ((HttpURLConnection) con).setRequestMethod("HEAD");
  10.     }
  11.     return (long) con.getContentLength();
  12.   }
  13. }

代码示例来源：origin: stackoverflow.com

  1. URL url = new URL("http://server.com/file.mp3");
  2. URLConnection urlConnection = url.openConnection();
  3. urlConnection.connect();
  4. int file_size = urlConnection.getContentLength();

代码示例来源：origin: chewiebug/GCViewer

  1. private FileInformation readFileInformation(URL url) {
  2.   FileInformation fileInformation = new FileInformation();
  3.   URLConnection urlConnection;
  4.   try {
  5.     if (url.getProtocol().startsWith("http")) {
  6.       urlConnection = url.openConnection();
  7.       ((HttpURLConnection) urlConnection).setRequestMethod("HEAD");
  8.       try (InputStream inputStream = urlConnection.getInputStream()) {
  9.         fileInformation.length = urlConnection.getContentLength();
  10.         fileInformation.lastModified = urlConnection.getLastModified();
  11.       }
  12.     }
  13.     else {
  14.       if (url.getProtocol().startsWith("file")) {
  15.         File file = new File(url.getFile());
  16.         if (file.exists()) {
  17.           fileInformation = new FileInformation(file);
  18.         }
  19.       }
  20.     }
  21.   }
  22.   catch (IOException e) {
  23.     if (LOG.isLoggable(Level.WARNING))
  24.       LOG.log(Level.WARNING, "Failed to obtain age and length of URL " + url, e);
  25.   }
  26.   return fileInformation;
  27. }

代码示例来源：origin: thymeleaf/thymeleaf

  1. final URLConnection connection = this.url.openConnection();
  2. if (connection.getContentLength() >= 0) {
  3.   return true;

代码示例来源：origin: stackoverflow.com

  1. public static boolean hasInternetAccess(Context context) {
  2.   if (isNetworkAvailable(context)) {
  3.     try {
  4.       HttpURLConnection urlc = (HttpURLConnection) 
  5.         (new URL("http://clients3.google.com/generate_204")
  6.         .openConnection());
  7.       urlc.setRequestProperty("User-Agent", "Android");
  8.       urlc.setRequestProperty("Connection", "close");
  9.       urlc.setConnectTimeout(1500); 
  10.       urlc.connect();
  11.       return (urlc.getResponseCode() == 204 &&
  12.             urlc.getContentLength() == 0);
  13.     } catch (IOException e) {
  14.       Log.e(TAG, "Error checking internet connection", e);
  15.     }
  16.   } else {
  17.     Log.d(TAG, "No network available!");
  18.   }
  19.   return false;
  20. }

代码示例来源：origin: org.apache.logging.log4j/log4j-core

  1. @Override
  2.   protected Class<?> findClass(final String name) throws ClassNotFoundException {
  3.     final String path = name.replace('.', '/').concat(".class");
  4.     final URL resource = super.getResource(path);
  5.     if (resource == null) {
  6.       throw new ClassNotFoundException(name);
  7.     }
  8.     try {
  9.       final URLConnection uc = resource.openConnection();
  10.       final int len = uc.getContentLength();
  11.       final InputStream in = new BufferedInputStream(uc.getInputStream());
  12.       final byte[] bytecode = new byte[len];
  13.       try {
  14.         IOUtils.readFully(in, bytecode);
  15.       } finally {
  16.         Closer.closeSilently(in);
  17.       }
  18.       return defineClass(name, bytecode, 0, bytecode.length);
  19.     } catch (final IOException e) {
  20.       Throwables.rethrow(e);
  21.       return null; // unreachable
  22.     }
  23.   }
  24. }

代码示例来源：origin: micronaut-projects/micronaut-core

  1. @Override
  2. public long contentLength() throws IOException {
  3.   URL url = getURL();
  4.   if (ResourceUtils.isFileURL(url)) {
  5.     // Proceed with file system resolution...
  6.     return getFile().length();
  7.   }
  8.   // Try a URL connection content-length header...
  9.   URLConnection con = url.openConnection();
  10.   useCachesIfNecessary(con);
  11.   if (con instanceof HttpURLConnection) {
  12.     ((HttpURLConnection) con).setRequestMethod("HEAD");
  13.   }
  14.   return con.getContentLength();
  15. }

代码示例来源：origin: redisson/redisson

  1. URL url = new URL("http", server, port,
  2.          "/" + classname.replace('.', '/') + ".class");
  3. URLConnection con = url.openConnection();
  4. con.connect();
  5. int size = con.getContentLength();
  6. InputStream s = con.getInputStream();
  7. if (size <= 0)
  8.   b = readStream(s);
  9.   int len = 0;
  10.   do {
  11.     int n = s.read(b, len, size - len);
  12.     if (n < 0) {
  13.       s.close();

代码示例来源：origin: stackoverflow.com

  1. private int getFileSize(URL url) {
  2.   HttpURLConnection conn = null;
  3.   try {
  4.     conn = (HttpURLConnection) url.openConnection();
  5.     conn.setRequestMethod("HEAD");
  6.     conn.getInputStream();
  7.     return conn.getContentLength();
  8.   } catch (IOException e) {
  9.     return -1;
  10.   } finally {
  11.     conn.disconnect();
  12.   }
  13. }

代码示例来源：origin: perwendel/spark

  1. } else {
  2.   URLConnection con = url.openConnection();
  3.   customizeConnection(con);
  4.   HttpURLConnection httpCon =
  5.   if (con.getContentLength() >= 0) {
  6.     return true;

代码示例来源：origin: stackoverflow.com

  1. String path = "/sdcard/YourApp.apk";
  2. try {
  3.   URL url = new URL(sUrl[0]);
  4.   URLConnection connection = url.openConnection();
  5.   connection.connect();
  6.   int fileLength = connection.getContentLength();
  7.   OutputStream output = new FileOutputStream(path);
  8.   while ((count = input.read(data)) != -1) {
  9.     total += count;
  10.     publishProgress((int) (total * 100 / fileLength));

代码示例来源：origin: com.google.gwt/gwt-servlet

  1. /**
  2.  * Helper method to read the contentLength of a given URL, automatically
  3.  * closing the InputStream that is opened as a side effect.
  4.  */
  5. private int getContentLength(URL url) throws IOException {
  6.  URLConnection conn = url.openConnection();
  7.  try {
  8.   return conn.getContentLength();
  9.  } finally {
  10.   Utility.close(conn.getInputStream());
  11.  }
  12. }

代码示例来源：origin: deeplearning4j/nd4j

  1. return this.getFile().exists();
  2. } else {
  3.   URLConnection con = ex.openConnection();
  4.   ResourceUtils.useCachesIfNecessary(con);
  5.   HttpURLConnection httpCon = con instanceof HttpURLConnection ? (HttpURLConnection) con : null;
  6.   if (con.getContentLength() >= 0) {
  7.     return true;
  8.   } else if (httpCon != null) {

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