Java File类代码示例

import java.io.File; //导入依赖的package包/类
public SmallObjectHeap(final String p_memDumpFile, final Storage p_memory) {
    m_memory = p_memory;

    File file = new File(p_memDumpFile);

    if (!file.exists()) {
        throw new MemoryRuntimeException("Cannot create heap from mem dump " + p_memDumpFile + ": file does not exist");
    }

    RandomAccessFileImExporter importer;
    try {
        importer = new RandomAccessFileImExporter(file);
    } catch (final FileNotFoundException e) {
        // cannot happen
        throw new MemoryRuntimeException("Illegal state", e);
    }

    importer.importObject(this);
}
 

import java.io.File; //导入依赖的package包/类
/** 
 * The semantics of mkdirsWithExistsCheck method is different from the mkdirs
 * method provided in the Sun's java.io.File class in the following way:
 * While creating the non-existent parent directories, this method checks for
 * the existence of those directories if the mkdir fails at any point (since
 * that directory might have just been created by some other process).
 * If both mkdir() and the exists() check fails for any seemingly 
 * non-existent directory, then we signal an error; Sun's mkdir would signal
 * an error (return false) if a directory it is attempting to create already
 * exists or the mkdir fails.
 * @param dir
 * @return true on success, false on failure
 */
public static boolean mkdirsWithExistsCheck(File dir) {
  if (dir.mkdir() || dir.exists()) {
    return true;
  }
  File canonDir = null;
  try {
    canonDir = dir.getCanonicalFile();
  } catch (IOException e) {
    return false;
  }
  String parent = canonDir.getParent();
  return (parent != null) && 
         (mkdirsWithExistsCheck(new File(parent)) &&
                                    (canonDir.mkdir() || canonDir.exists()));
}
 

import java.io.File; //导入依赖的package包/类
private void doTestUnpackWAR(boolean unpackWARs, boolean unpackWAR,
        boolean external, boolean resultDir) throws Exception {

    Tomcat tomcat = getTomcatInstance();
    StandardHost host = (StandardHost) tomcat.getHost();

    host.setUnpackWARs(unpackWARs);

    tomcat.start();

    File war;
    if (unpackWAR) {
        war = createWar(WAR_XML_UNPACKWAR_TRUE_SOURCE, !external);
    } else {
        war = createWar(WAR_XML_UNPACKWAR_FALSE_SOURCE, !external);
    }
    if (external) {
        createXmlInConfigBaseForExternal(war);
    }

    host.backgroundProcess();

    File dir = new File(host.getAppBase(), APP_NAME.getBaseName());
    Assert.assertEquals(
            Boolean.valueOf(resultDir), Boolean.valueOf(dir.isDirectory()));
}
 

import java.io.File; //导入依赖的package包/类
private void processSubFiles(File file, ProcessSubAIDLFileCallback callback) {
    if (file == null) {
        return;
    }
    if (file.isDirectory()) {
        File[] files = file.listFiles();
        if (files != null && files.length > 0) {
            for (File f : files) {
                processSubFiles(f, callback);
            }
        }
    } else {
        if (callback.matchFile(file)) {
            callback.processFile(file);
        }
    }
}
 

import java.io.File; //导入依赖的package包/类
/**
 * Generates a zip file.
 *
 * @param source      source file or directory to compress.
 * @param destination destination of zipped file.
 * @return the zipped file.
 */
private void generateZip (File source, File destination) throws IOException
{
   if (source == null || !source.exists ())
   {
      throw new IllegalArgumentException ("source file should exist");
   }
   if (destination == null)
   {
      throw new IllegalArgumentException (
            "destination file should be not null");
   }

   FileOutputStream output = new FileOutputStream (destination);
   ZipOutputStream zip_out = new ZipOutputStream (output);
   zip_out.setLevel (
         cfgManager.getDownloadConfiguration ().getCompressionLevel ());

   List<QualifiedFile> file_list = getFileList (source);
   byte[] buffer = new byte[BUFFER_SIZE];
   for (QualifiedFile qualified_file : file_list)
   {
      ZipEntry entry = new ZipEntry (qualified_file.getQualifier ());
      InputStream input = new FileInputStream (qualified_file.getFile ());

      int read;
      zip_out.putNextEntry (entry);
      while ((read = input.read (buffer)) != -1)
      {
         zip_out.write (buffer, 0, read);
      }
      input.close ();
      zip_out.closeEntry ();
   }
   zip_out.close ();
   output.close ();
}
 

import java.io.File; //导入依赖的package包/类
/**
* Zips the specified file.
* @param file The file to archive.
* @param destinationZipArchive Specifies the zip archive where to store the specified 
* file. If the zip archive already exists, it is deleted before starting
* the process. Folders and subfolders are created if needed. If the specified file
* already exists and it is a folder, an exception is raised.
* @param moveFile If <i>true</i> the specified file is deleted from its original
* location after the zip archive has been successfully created.
*/
public static void zipFile(File file,File destinationZipArchive,boolean moveFile) throws Exception {
	try {
		ArrayList<File> list=new ArrayList<File>();
		list.add(file);
		zipFiles(list,destinationZipArchive,moveFile);
	}
	catch  (Exception e) {
		String sFile="null";
		if (file!=null) sFile=file.getAbsolutePath();
		String sDestinationZipArchive="null";
		if (destinationZipArchive!=null) sDestinationZipArchive=destinationZipArchive.getAbsolutePath();
		throw new Exception(ParseError.parseError("ZipHelper.zipFile('"+sFile+"','"+sDestinationZipArchive+"',"+moveFile,e));
	}
}
 

import java.io.File; //导入依赖的package包/类
/**
 * Sets offline file path.
 *
 * @param newPath the new path
 * @return the offline file path
 */
public synchronized static boolean setOfflineFilePath( String newPath )
{
	if ( !newPath.endsWith( "/" ) )
	{
		newPath = newPath + "/";
	}

	File newTarget = new File( newPath );

	if ( !newTarget.exists() || !newTarget.isDirectory() )
	{
		return false;
	}

	OFFLINE_FILE_PATH = newPath;

	return true;
}
 

import java.io.File; //导入依赖的package包/类
public void testResources() throws Exception { // #208816
    TestFileUtils.writeFile(d,
            "pom.xml",
            "<project xmlns='http://maven.apache.org/POM/4.0.0'>" +
            "<modelVersion>4.0.0</modelVersion>" +
            "<groupId>grp</groupId>" +
            "<artifactId>art</artifactId>" +
            "<packaging>jar</packaging>" +
            "<version>0</version>" +
            "</project>");
    FileObject res = FileUtil.createFolder(d, "src/main/resources");
    FileObject tres = FileUtil.createFolder(d, "src/test/resources");
    CharSequence log = Log.enable(BinaryForSourceQuery.class.getName(), Level.FINE);
    File repo = EmbedderFactory.getProjectEmbedder().getLocalRepositoryFile();
    File art0 = new File(repo, "grp/art/0/art-0.jar");
    URL url0 = FileUtil.getArchiveRoot(art0.toURI().toURL()); 

    assertEquals(Arrays.asList(new URL(d.toURL(), "target/classes/"), url0), Arrays.asList(BinaryForSourceQuery.findBinaryRoots(res.toURL()).getRoots()));
    assertEquals(Arrays.asList(new URL(d.toURL(), "target/test-classes/"), url0), Arrays.asList(BinaryForSourceQuery.findBinaryRoots(tres.toURL()).getRoots()));
    String logS = log.toString();
    assertFalse(logS, logS.contains("-> nil"));
    assertTrue(logS, logS.contains("ProjectBinaryForSourceQuery"));
}
 

import java.io.File; //导入依赖的package包/类
private Properties readProperties(Vector <? extends Property> antProperties) throws IOException {
    Properties props = new Properties();
    for(Property prop : antProperties) {
        if(prop.getName()!=null) {
            if(prop.getValue()!=null) {
                props.setProperty(prop.getName(), prop.getValue());
            } else if(prop.getLocation()!=null) {
                props.setProperty(prop.getName(),
                        new File(prop.getLocation().getFileName()).getAbsolutePath());
            }
        } else if(prop.getFile()!=null || prop.getUrl()!=null) {
            InputStream is = null;
            try {
                is = (prop.getFile()!=null) ?
                    new FileInputStream(prop.getFile()) :
                    prop.getUrl().openStream();
                
                Properties loadedProps = new Properties();
                loadedProps.load(is);
                is.close();
                if ( prop.getPrefix() != null ) {
                    for(Object p : loadedProps.keySet()) {
                        props.setProperty(prop.getPrefix() + p,
                                loadedProps.getProperty(p.toString()));
                    }
                } else {
                    props.putAll(loadedProps);
                }
            } finally {
                if (is != null) {
                    is.close();
                }
            }
        }
    }
    
    return props;
}
 

import java.io.File; //导入依赖的package包/类
public void testCheckoutFilesFromIndexFileToFolder () throws Exception {
    File folder = new File(workDir, "folder");
    File subFolder = new File(folder, "folder");
    File file1 = new File(subFolder, "file2");
    subFolder.mkdirs();
    write(file1, "file 1 content");
    File[] files = new File[] { folder };
    add(files);
    commit(files);

    file1.delete();
    subFolder.delete();
    folder.delete();
    write(folder, "blabla");

    GitClient client = getClient(workDir);
    Map<File, GitStatus> statuses = client.getStatus(files, NULL_PROGRESS_MONITOR);
    assertStatus(statuses, workDir, file1, true, GitStatus.Status.STATUS_NORMAL, GitStatus.Status.STATUS_REMOVED, GitStatus.Status.STATUS_REMOVED, false);
    client.checkout(new File[] { folder }, null, true, NULL_PROGRESS_MONITOR);
    statuses = client.getStatus(files, NULL_PROGRESS_MONITOR);
    assertStatus(statuses, workDir, file1, true, GitStatus.Status.STATUS_NORMAL, GitStatus.Status.STATUS_NORMAL, GitStatus.Status.STATUS_NORMAL, false);
    assert(file1.isFile());
    assertEquals("file 1 content", read(file1));
}
 

import java.io.File; //导入依赖的package包/类
@SuppressWarnings("unchecked")
@Test
public void testInitNextRecordReader() throws IOException{
  JobConf conf = new JobConf();
  Path[] paths = new Path[3];
  long[] fileLength = new long[3];
  File[] files = new File[3];
  LongWritable key = new LongWritable(1);
  Text value = new Text();
  try {
    for(int i=0;i<3;i++){
      fileLength[i] = i;
      File dir = new File(outDir.toString());
      dir.mkdir();
      files[i] = new File(dir,"testfile"+i);
      FileWriter fileWriter = new FileWriter(files[i]);
      fileWriter.close();
      paths[i] = new Path(outDir+"/testfile"+i);
    }
    CombineFileSplit combineFileSplit = new CombineFileSplit(conf, paths, fileLength);
    Reporter reporter = Mockito.mock(Reporter.class);
    CombineFileRecordReader cfrr = new CombineFileRecordReader(conf, combineFileSplit,
      reporter,  TextRecordReaderWrapper.class);
    verify(reporter).progress();
    Assert.assertFalse(cfrr.next(key,value));
    verify(reporter, times(3)).progress();
  } finally {
    FileUtil.fullyDelete(new File(outDir.toString()));
  }

}
 

import java.io.File; //导入依赖的package包/类
private void startDownload() {
    File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS), "ency.apk");
    AppFileUtil.delFile(file, true);
    // 创建下载任务
    DownloadManager.Request request = new DownloadManager.Request(Uri.parse("http://ucdl.25pp.com/fs08/2017/09/19/10/2_b51f7cae8d7abbd3aaf323a431826420.apk?sf=9946816&vh=1e3a8680ee88002bdf2f00f715146e16&sh=10&cc=3646561943&appid=7060083&packageid=400525966&md5=27456638a0e6615fb5153a7a96c901bf&apprd=7060083&pkg=com.taptap&vcode=311&fname=TapTap&pos=detail-ndownload-com.taptap"));
    // 显示下载信息
    request.setTitle("Ency");
    request.setDescription("新版本下载中");
    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE);
    request.setMimeType("application/vnd.android.package-archive");
    // 设置下载路径
    request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "ency.apk");
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
        request.allowScanningByMediaScanner();
        request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
    }
    // 获取DownloadManager
    dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
    // 将下载请求加入下载队列，加入下载队列后会给该任务返回一个long型的id，通过该id可以取消任务，重启任务、获取下载的文件等等
    downloadId = dm.enqueue(request);
    Toast.makeText(this, "后台下载中，请稍候...", Toast.LENGTH_SHORT).show();
}
 

import java.io.File; //导入依赖的package包/类
private static void replayAuditLog() {
    System.out.println("\n\nStarting replay with new instance of G10Monitor");
    System.out.println("=================================================================================================");
    G10Monitor monitor = new G10Monitor();
    monitor.registerBreachNotificationHandler(new ConsoleBreachHandler());
    monitor.registerResultsReceiver(new OrderBiasResultPrinter());
    monitor.registerEventAuditor(new ConsoleAuditor());
    CsvAuditReplay replay = new CsvAuditReplay();
    /**
     * Disable all audit and publishing with: 
     * monitor.enableAudit(true);
     * monitor.enableResultPublication(true);
     * monitor.enableResultPublication(true);
     */
    replay.replay(monitor, new File("target\\generated-sources\\testlog\\fluxtionfx-audit.log"));
    System.out.println("=================================================================================================");

}
 

import java.io.File; //导入依赖的package包/类
/**
 * Makes file path if it doesn't exist
 **/
public static boolean makeFilePath(File file) {
    String parent = file.getParent();
    if (parent != null) {
        File dir = new File(parent);
        try {
            if (!dir.exists() && !dir.mkdirs()) {
                throw new SecurityException("File.mkdirs() returns false");
            }
        } catch (SecurityException e) {
            Log.w(TAG, e);
            return false;
        }
    }

    return true;
}
 

import java.io.File; //导入依赖的package包/类
/**
 * 更新 List<Participant>  只更新这一个字段数据
 *
 * @param tccTransaction 实体对象
 */
@Override
public int updateParticipant(TccTransaction tccTransaction) {
    try {

        final String fullFileName = RepositoryPathUtils.getFullFileName(filePath,tccTransaction.getTransId());
        final File file = new File(fullFileName);
        final CoordinatorRepositoryAdapter adapter = readAdapter(file);
        if(Objects.nonNull(adapter)){
            adapter.setContents(serializer.serialize(tccTransaction.getParticipants()));
        }
        FileUtils.writeFile(fullFileName,serializer.serialize(adapter));

    } catch (Exception e) {
        throw new TccRuntimeException("更新数据异常！");
    }
    return 1;
}