文件操作工具類（FileUtils）

使用 apache 的commons-io包下的FileUtils，import org.apache.commons.io.FileUtils;

下載地址：http://commons.apache.org/proper/commons-io/download_io.cgi

官方API文檔：http://commons.apache.org/proper/commons-io/apidocs/org/apache/commons/io/FileUtils.html

靜態方法可以直接使用類名使用

maven 創建的java工程，導入依賴

<dependency><groupId>commons-fileupload</groupId><artifactId>commons-fileupload</artifactId><version>1.3.3</version></dependency>

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一、拷貝文件

static void	copyFile(File?srcFile,?File?destFile) Copies a file to a new location preserving the file date.
static void	copyFile(File?srcFile,?File?destFile, boolean?preserveFileDate) Copies a file to a new location.
static long	copyFile(File?input,?OutputStream?output) Copy bytes from a?File?to an?OutputStream.
static void	copyFileToDirectory(File?srcFile,?File?destDir) Copies a file to a directory preserving the file date.
static void	copyFileToDirectory(File?srcFile,?File?destDir, boolean?preserveFileDate) Copies a file to a directory optionally preserving the file date.
static void	copyInputStreamToFile(InputStream?source,?File?destination) Copies bytes from an?InputStream?source?to a file?destination.
static void	copyToDirectory(File?src,?File?destDir) Copies a file or directory to within another directory preserving the file dates.
static void	copyToDirectory(Iterable<File>?srcs,?File?destDir) Copies a files to a directory preserving each file's date.
static void	copyToFile(InputStream?source,?File?destination) Copies bytes from an?InputStream?source?to a file?destination.
static void	copyURLToFile(URL?source,?File?destination) Copies bytes from the URL?source?to a file?destination.
static void	copyURLToFile(URL?source,?File?destination, int?connectionTimeout, int?readTimeout) Copies bytes from the URL?source?to a file?destination.

1）拷貝文件到文件：copyFile(File?srcFile,?File?destFile)

File file = new File("E:\\java\\file01\\abc雪.jpg");String destFilePath = "E:\\java\\file02";String destFileName = "abc雪02.jpg";try {FileUtils fileUtils = new FileUtils();//文件拷貝到新的位置并保存文件的日期。fileUtils.copyFile(file, new File(destFilePath,destFileName));System.out.println("文件拷貝成功");} catch (IOException e) {e.printStackTrace();System.out.println(e.getMessage());}

? ? 2）拷貝文件到字節輸出流。：copyFile(File?input,?OutputStream?output)

String destFileName = "abc雪03.jpg"; //從文件copy to an字節輸出流。 FileUtils.copyFile(file, new FileOutputStream(new File(destFilePath,destFileName)));

3）拷貝文件到文件的目錄保存文件的日期：copyFileToDirectory(File?srcFile,?File?destDir)

? 拷貝的文件名無法自定義，和原文件名一樣

//拷貝文件到文件的目錄保持文件的日期。 FileUtils.copyFileToDirectory(file, new File(destFilePath));

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二、拷貝目錄及文件

static void	copyDirectory(File?srcDir,?File?destDir) Copies a whole directory to a new location preserving the file dates.
static void	copyDirectory(File?srcDir,?File?destDir, boolean?preserveFileDate) Copies a whole directory to a new location.
static void	copyDirectory(File?srcDir,?File?destDir,?FileFilter?filter) Copies a filtered directory to a new location preserving the file dates.
static void	copyDirectory(File?srcDir,?File?destDir,?FileFilter?filter, boolean?preserveFileDate) Copies a filtered directory to a new location.
static void	copyDirectoryToDirectory(File?srcDir,?File?destDir) Copies a directory to within another directory preserving the file dates.

1）將整個目錄拷貝到新位置，并保持原文件日期：copyDirectory(File?srcDir,?File?destDir)

? ?? 其包含文件及子目錄文件并保持原文件日期

File file = new File("E:\\java\\file01");String destFilePath = "E:\\java\\file03";try {//將整個目錄復制新位置，并保持原文件日期。FileUtils.copyDirectory(file, new File(destFilePath));System.out.println("文件目錄拷貝成功");} catch (IOException e) {e.printStackTrace();System.out.println(e.getMessage());}

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2）將已篩選的目錄拷貝的新位置：copyDirectory(File?srcDir,?File?destDir,?FileFilter?filter)

? ?? 文件過濾器篩選 其包含文件及子目錄文件 拷貝，并保持原文件日期。

String destFilePath = "E:\\java\\file04"; //將已篩選的目錄復制，并保持原文件日期的新位置。 FileUtils.copyDirectory(file, new File(destFilePath), new FileFilter() {@Overridepublic boolean accept(File pathname) {if(pathname.isDirectory()) return true;else {boolean b1 = pathname.getName().endsWith(".txt");boolean b2 = pathname.getName().endsWith(".jpg");return b1 || b2;}} });

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三、刪除目錄及文件

static void	deleteDirectory(File?directory) Deletes a directory recursively.
static boolean	deleteQuietly(File?file) Deletes a file, never throwing an exception.
static void	forceDelete(File?file) Deletes a file.

1）刪除指定文件，從不引發異常：deleteQuietly(File?file)

File file = new File("E:\\java\\file04\\abc雪.jpg"); //刪除指定文件，從不引發異常。 FileUtils.deleteQuietly(file);

2）刪除指定文件，不存在報異常：forceDelete(File?file)

File file = new File("E:\\java\\file04\\abc雪.jpg");try {FileUtils.forceDelete(file);System.out.println("操作成功");} catch (IOException e) {e.printStackTrace();System.out.println(e.getMessage());}

3）遞歸刪除目錄：deleteDirectory(File?directory)

?? 刪除其包含文件及子目錄文件

File file = new File("E:\\java\\file04\\abc雪.jpg");//遞歸刪除目錄。try {FileUtils.deleteDirectory(new File(destFilePath));System.out.println("操作成功");} catch (IOException e) {e.printStackTrace();System.out.println(e.getMessage());}

四、清除目錄：cleanDirectory(File?directory)

static void

cleanDirectory(File?directory) Cleans a directory without deleting it.

?清除該目錄下的文件及子目錄文件而不刪除該目錄文件夾。該目錄不存在會報錯

String destFilePath = "E:\\java\\file04"; try {FileUtils.cleanDirectory(new File(destFilePath));System.out.println("操作成功"); } catch (IOException e) {e.printStackTrace();System.out.println(e.getMessage()); }

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其他方法查看API文檔

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