Java檔案拷貝的幾種實現方案
阿新 • • 發佈:2019-02-05
在jdk1.7之前,java中沒有直接的類提供檔案複製功能。下面就檔案複製,提出幾種方案。
jdk1.7中的檔案複製
在jdk1.7版本中可以直接使用Files.copy(File srcFile, File destFile)方法即可。
private static void copyFileUsingJava7Files(File source, File dest)
throws IOException {
Files.copy(source.toPath(), dest.toPath());
}
使用FileInputStream複製
/**
*
* @Title : copyFileUsingStream
* @Description: 使用Stream拷貝檔案
* @param: @param source
* @param: @param dest
* @param: @throws IOException
* @return: void
* @throws
*/
public static void copyFileUsingStream(File source, File dest)
throws IOException {
InputStream is = null;
OutputStream os = null;
try {
is = new FileInputStream(source);
os = new FileOutputStream(dest);
byte[] buffer = new byte[1024];
int length;
while ((length = is.read(buffer)) > 0) {
os.write(buffer, 0, length);
}
} finally {
if(is != null) {
is.close();
}
if (os != null) {
os.close();
}
}
}
使用FileChannel實現複製
/**
* @throws IOException
*
* @Title: copyFileUsingChannel
* @Description: 使用Channel拷貝檔案
* @param: @param source
* @param: @param dest
* @return: void
* @throws
*/
public static void copyFileUsingChannel(File source, File dest) throws IOException {
FileChannel sourceChannel = null;
FileChannel destChannel = null;
try {
sourceChannel = new FileInputStream(source).getChannel();
destChannel = new FileOutputStream(dest).getChannel();
destChannel.transferFrom(sourceChannel, 0, sourceChannel.size());
} finally {
if(sourceChannel != null) {
sourceChannel.close();
}
if(destChannel != null) {
destChannel.close();
}
}
}
使用Apache Commons IO包中的FileUtils.copyFile複製
public static void copyFileUsingApacheIO(File source, File dest) throws IOException {
FileUtils.copyFile(source, dest);
}
使用IO重定向實現複製
/**
*
* @Title: copyFileUsingRedirection
* @Description: 使用Redirection拷貝檔案
* @param: @param source
* @param: @param dest
* @param: @throws IOException
* @return: void
* @throws
*/
public static void copyFileUsingRedirection(File source, File dest) throws IOException {
FileInputStream in = null;
PrintStream out = null;
try {
in = new FileInputStream(source);
out = new PrintStream(dest);
System.setIn(in);
System.setOut(out);
Scanner sc = new Scanner(System.in);
while(sc.hasNext()) {
System.out.println(sc.nextLine());
}
} finally{
if(in != null) {
in.close();
}
if(out != null) {
out.close();
}
}
}