package com.tij.io.file;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.channels.FileChannel;
import javax.naming.ldap.SortControl;
import org.apache.commons.io.FileUtils;
/**
* java复杂文件的四种方法
* @author guoyoujun
* @date 2014-3-17
*/
public class JavaCopyFile {
/**
* java复杂文件的四种方法
* <p>1、传统方法:使用流
* <p>2、java.nio.channels.FileChannel
* <p>3、Apache Commons IO FileUtils.copyFile()
* <p>4、java7 copy()
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
File source = new File("/Users/GYJ/funshion/update/popwind.json");
File dest = new File("/Users/GYJ/a.json");
copyFileUsingStream(source, dest);
copyFileUsingChannel(source, dest);
copyFileUsingApacheCommonsIO(source, dest);
copyFileUsingJava7Files(source, dest);
}
/**
* 使用流来复制文件
* @param source
* @param dest
* @throws IOException
*/
private 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);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} finally {
is.close();
os.close();
}
}
/**
* 使用java.nio.channels.FileChannel
* @param source
* @param dest
* @throws IOException
*/
private 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());
} catch (FileNotFoundException e) {
e.printStackTrace();
} finally {
sourceChannel.close();
destChannel.close();
}
}
/**
* 使用ApacheCommonsIO(需要commons-io-2.0.1.jar)
* @param source
* @param dest
* @throws IOException
*/
private static void copyFileUsingApacheCommonsIO(File source, File dest) throws IOException {
// org.apache.commons.io.FileUtils
FileUtils.copyFile(source, dest);
}
/**
* java7中的方法
* @param source
* @param dest
*/
private static void copyFileUsingJava7Files(File source, File dest) {
//java7中可以使用Files类的copy()方法
//Files.copy(source.toPath(), dest.toPath());
}
}