文件操作工具类（FileUtils）

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

下载地址：http://commons.apache.org/proper/commons-io/download_io.cgi

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

静态方法可以直接使用类名使用

maven 创建的java工程，导入依赖

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

一、拷贝文件

`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）拷贝文件到文件：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();//文件拷贝到新的位置并保存文件的日期。fileUtils.copyFile(file, new File(destFilePath,destFileName));System.out.println("文件拷贝成功");} catch (IOException e) {e.printStackTrace();System.out.println(e.getMessage());}

2）拷贝文件到字节输出流。：copyFile(File input, OutputStream output)

String destFileName = "abc雪03.jpg";
//从文件copy to an字节输出流。
FileUtils.copyFile(file, new FileOutputStream(new File(destFilePath,destFileName)));

3）拷贝文件到文件的目录保存文件的日期：copyFileToDirectory(File srcFile, File destDir)

拷贝的文件名无法自定义，和原文件名一样

//拷贝文件到文件的目录保持文件的日期。
FileUtils.copyFileToDirectory(file, new File(destFilePath));

二、拷贝目录及文件

`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）将整个目录拷贝到新位置，并保持原文件日期：copyDirectory(File srcDir, File destDir)

其包含文件及子目录文件并保持原文件日期

		File file = new File("E:\\java\\file01");String destFilePath = "E:\\java\\file03";try {//将整个目录复制新位置，并保持原文件日期。FileUtils.copyDirectory(file, new File(destFilePath));System.out.println("文件目录拷贝成功");} catch (IOException e) {e.printStackTrace();System.out.println(e.getMessage());}

2）将已筛选的目录拷贝的新位置：copyDirectory(File srcDir, File destDir, FileFilter filter)

文件过滤器筛选其包含文件及子目录文件拷贝，并保持原文件日期。

String destFilePath = "E:\\java\\file04";
//将已筛选的目录复制，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;}}
});

三、删除目录及文件

`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）删除指定文件，从不引发异常：deleteQuietly(File file)

File file = new File("E:\\java\\file04\\abc雪.jpg");
//删除指定文件，从不引发异常。
FileUtils.deleteQuietly(file);

2）删除指定文件，不存在报异常：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）递归删除目录：deleteDirectory(File directory)

删除其包含文件及子目录文件

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

四、清除目录：`cleanDirectory(File directory)`

static void

cleanDirectory(File directory)

Cleans a directory without deleting it.

清除该目录下的文件及子目录文件而不删除该目录文件夹。该目录不存在会报错

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());
}

其他方法查看API文档