java复制文件的四种步骤
java复制文件的四种方法
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()); } }