java.net.URLConnection.getLastModified()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.getLastModified()方法的一些代码示例，展示了URLConnection.getLastModified()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.getLastModified()方法的具体详情如下：
包路径：java.net.URLConnection
类名称：URLConnection
方法名：getLastModified

URLConnection.getLastModified介绍

[英]Returns the value of the response header field last-modified or 0 if this value is not set.
[中]返回上次修改的响应头字段的值，如果未设置此值，则返回0。

代码示例

代码示例来源：origin: org.netbeans.api/org-openide-filesystems

  1. private java.util.Date timeFromDateHeaderField(URL url) {
  2.   URLConnection urlConn;
  3.   try {
  4.     urlConn = url.openConnection();
  5.     return new Date(urlConn.getLastModified());
  6.   } catch (IOException ie) {
  7.     return new java.util.Date(0);
  8.   }
  9. }

代码示例来源：origin: jenkinsci/jenkins

  1. public void doIndex( StaplerRequest req, StaplerResponse rsp) throws IOException, ServletException {
  2.   URLConnection con = connect();
  3.   // since we end up redirecting users to jnlpJars/foo.jar/, set the content disposition
  4.   // so that browsers can download them in the right file name.
  5.   // see http://support.microsoft.com/kb/260519 and http://www.boutell.com/newfaq/creating/forcedownload.html
  6.   rsp.setHeader("Content-Disposition", "attachment; filename=" + fileName);
  7.   InputStream in = con.getInputStream();
  8.   rsp.serveFile(req, in, con.getLastModified(), con.getContentLength(), "*.jar" );
  9.   in.close();
  10. }

代码示例来源：origin: plutext/docx4j

  1. /**
  2.  * Retrieve the last modified date/time of a URL.
  3.  * @param url the URL
  4.  * @return the last modified date/time
  5.  */
  6. public static long getLastModified(URL url) {
  7.   try {
  8.     URLConnection conn = url.openConnection();
  9.     try {
  10.       return conn.getLastModified();
  11.     } finally {
  12.       //An InputStream is created even if it's not accessed, but we need to close it.
  13.       IOUtils.closeQuietly(conn.getInputStream());
  14.     }
  15.   } catch (IOException e) {
  16.     // Should never happen, because URL must be local
  17.     log.debug("IOError: " + e.getMessage());
  18.     return 0;
  19.   }
  20. }

代码示例来源：origin: jMonkeyEngine/jmonkeyengine

  1. conn = url.openConnection();
  2.   int hash = classpath.hashCode() ^ (int) conn.getLastModified();
  3.   return hash;
  4. } catch (IOException ex) {
  5.   if (conn != null) {
  6.     try {
  7.       conn.getInputStream().close();
  8.       conn.getOutputStream().close();
  9.     } catch (IOException ex) { }

代码示例来源：origin: jenkinsci/jenkins

  1. URLConnection uc = url.openConnection();
  2. return uc.getLastModified();

代码示例来源：origin: jenkinsci/jenkins

  1. long sourceTimestamp = con.getLastModified();
  2. InputStream in = archive.getProtocol().startsWith("http") ? ProxyConfiguration.getInputStream(archive) : con.getInputStream();
  3. CountingInputStream cis = new CountingInputStream(in);
  4. try {

代码示例来源：origin: jooby-project/jooby

  1. private static Supplier attr(final URL resource, final BiConsumer<Long, Long> attrs)
  2.   throws Exception {
  3.  if ("file".equals(resource.getProtocol())) {
  4.   File file = new File(resource.toURI());
  5.   if (file.exists() && file.isFile()) {
  6.    attrs.accept(file.length(), file.lastModified());
  7.    return () -> new FileInputStream(file);
  8.   }
  9.   return null;
  10.  } else {
  11.   URLConnection cnn = resource.openConnection();
  12.   cnn.setUseCaches(false);
  13.   attrs.accept(cnn.getContentLengthLong(), cnn.getLastModified());
  14.   try {
  15.    Closeables.closeQuietly(cnn.getInputStream());
  16.   } catch (NullPointerException ex) {
  17.    // dir entries throw NPE :S
  18.    return null;
  19.   }
  20.   return () -> resource.openStream();
  21.  }
  22. }

代码示例来源：origin: xalan/xalan

  1. /**
  2.  * Returns the time-stamp for a document's last update
  3.  */
  4. private final long getLastModified(String uri) {
  5. try {
  6.   URL url = new URL(uri);
  7.   URLConnection connection = url.openConnection();
  8.   long timestamp = connection.getLastModified();
  9.   // Check for a "file:" URI (courtesy of Brian Ewins)
  10.   if (timestamp == 0){ // get 0 for local URI
  11.     if ("file".equals(url.getProtocol())){
  12.       File localfile = new File(URLDecoder.decode(url.getFile()));
  13.       timestamp = localfile.lastModified();
  14.     }
  15.   }
  16.   return(timestamp);
  17. }
  18. // Brutal handling of all exceptions
  19. catch (Exception e) {
  20.   return(System.currentTimeMillis());
  21. }
  22. }

代码示例来源：origin: pentaho/mondrian

  1. public InputStream openStream() {
  2.   try {
  3.     final URLConnection connection = getConnection();
  4.     this.lastModified = connection.getLastModified();
  5.     return connection.getInputStream();
  6.   } catch (IOException e) {
  7.     throw Util.newInternal(
  8.       e,
  9.       "Error while opening properties file '" + url + "'");
  10.   }
  11. }

代码示例来源：origin: org.freemarker/freemarker

  1. jarConn = jarURL.openConnection();
  2.   return jarConn.getLastModified();
  3.  } catch (IOException e) {
  4.   return -1;
  5.  } finally {
  6.   try {
  7.    if (jarConn != null) jarConn.getInputStream().close();
  8.   } catch (IOException e) { }
  9. long lastModified = conn.getLastModified();
  10. if (lastModified == -1L && url.getProtocol().equals("file")) {

代码示例来源：origin: line/armeria

  1. @Override
  2. public HttpFileAttributes readAttributes() throws IOException {
  3.   if (attrs == null) {
  4.     final URLConnection conn = url.openConnection();
  5.     final long length = conn.getContentLengthLong();
  6.     final long lastModifiedMillis = conn.getLastModified();
  7.     attrs = new HttpFileAttributes(length, lastModifiedMillis);
  8.   }
  9.   return attrs;
  10. }

代码示例来源：origin: org.jenkins-ci.main/jenkins-core

  1. public void doIndex( StaplerRequest req, StaplerResponse rsp) throws IOException, ServletException {
  2.   URLConnection con = connect();
  3.   // since we end up redirecting users to jnlpJars/foo.jar/, set the content disposition
  4.   // so that browsers can download them in the right file name.
  5.   // see http://support.microsoft.com/kb/260519 and http://www.boutell.com/newfaq/creating/forcedownload.html
  6.   rsp.setHeader("Content-Disposition", "attachment; filename=" + fileName);
  7.   InputStream in = con.getInputStream();
  8.   rsp.serveFile(req, in, con.getLastModified(), con.getContentLength(), "*.jar" );
  9.   in.close();
  10. }

代码示例来源：origin: dropwizard/dropwizard

  1. case "jar":
  2.   try {
  3.     final JarURLConnection jarConnection = (JarURLConnection) resourceURL.openConnection();
  4.     final JarEntry entry = jarConnection.getJarEntry();
  5.     return entry.getTime();
  6.   URLConnection connection = null;
  7.   try {
  8.     connection = resourceURL.openConnection();
  9.     return connection.getLastModified();
  10.   } catch (IOException ignored) {
  11.     return 0;
  12.     if (connection != null) {
  13.       try {
  14.         connection.getInputStream().close();
  15.       } catch (IOException ignored) {

代码示例来源：origin: spring-projects/spring-framework

  1. @Override
  2. public long lastModified() throws IOException {
  3.   URL url = getURL();
  4.   boolean fileCheck = false;
  5.   if (ResourceUtils.isFileURL(url) || ResourceUtils.isJarURL(url)) {
  6.     // Proceed with file system resolution
  7.     fileCheck = true;
  8.     try {
  9.       File fileToCheck = getFileForLastModifiedCheck();
  10.       long lastModified = fileToCheck.lastModified();
  11.       if (lastModified > 0L || fileToCheck.exists()) {
  12.         return lastModified;
  13.       }
  14.     }
  15.     catch (FileNotFoundException ex) {
  16.       // Defensively fall back to URL connection check instead
  17.     }
  18.   }
  19.   // Try a URL connection last-modified header
  20.   URLConnection con = url.openConnection();
  21.   customizeConnection(con);
  22.   long lastModified = con.getLastModified();
  23.   if (fileCheck && lastModified == 0 && con.getContentLengthLong() <= 0) {
  24.     throw new FileNotFoundException(getDescription() +
  25.         " cannot be resolved in the file system for checking its last-modified timestamp");
  26.   }
  27.   return lastModified;
  28. }

代码示例来源：origin: org.jvnet.hudson.main/hudson-core

  1. public void doIndex( StaplerRequest req, StaplerResponse rsp) throws IOException, ServletException {
  2.   URLConnection con = connect();
  3.   // since we end up redirecting users to jnlpJars/foo.jar/, set the content disposition
  4.   // so that browsers can download them in the right file name.
  5.   // see http://support.microsoft.com/kb/260519 and http://www.boutell.com/newfaq/creating/forcedownload.html
  6.   rsp.setHeader("Content-Disposition", "attachment; filename=" + fileName);
  7.   InputStream in = con.getInputStream();
  8.   rsp.serveFile(req, in, con.getLastModified(), con.getContentLength(), "*.jar" );
  9.   in.close();
  10. }

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: perwendel/spark

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

代码示例来源：origin: org.eclipse.hudson/hudson-core

  1. public void doIndex(StaplerRequest req, StaplerResponse rsp) throws IOException, ServletException {
  2.   URLConnection con = connect();
  3.   // since we end up redirecting users to jnlpJars/foo.jar/, set the content disposition
  4.   // so that browsers can download them in the right file name.
  5.   // see http://support.microsoft.com/kb/260519 and http://www.boutell.com/newfaq/creating/forcedownload.html
  6.   rsp.setHeader("Content-Disposition", "attachment; filename=" + fileName);
  7.   InputStream in = con.getInputStream();
  8.   rsp.serveFile(req, in, con.getLastModified(), con.getContentLength(), "*.jar");
  9.   in.close();
  10. }

代码示例来源：origin: org.codehaus.groovy/groovy

  1. /**
  2.    * returns true if the source in URL is newer than the class
  3.    * NOTE: copied from GroovyClassLoader
  4.    */
  5.   private static boolean isSourceNewer(URL source, ClassNode cls) {
  6.     try {
  7.       long lastMod;
  9.       // Special handling for file:// protocol, as getLastModified() often reports
  10.       // incorrect results (-1)
  11.       if (source.getProtocol().equals("file")) {
  12.         // Coerce the file URL to a File
  13.         String path = source.getPath().replace('/', File.separatorChar).replace('|', ':');
  14.         File file = new File(path);
  15.         lastMod = file.lastModified();
  16.       } else {
  17.         URLConnection conn = source.openConnection();
  18.         lastMod = conn.getLastModified();
  19.         conn.getInputStream().close();
  20.       }
  21.       return lastMod > getTimeStamp(cls);
  22.     } catch (IOException e) {
  23.       // if the stream can't be opened, let's keep the old reference
  24.       return false;
  25.     }
  26.   }
  27. }

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

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

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