com.github.shepherdviolet.glacimon.java.io.BufferedFileCopyer Maven / Gradle / Ivy
/*
* Copyright (C) 2022-2022 S.Violet
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Project GitHub: https://github.com/shepherdviolet/glacimon
* Email: [email protected]
*/
package com.github.shepherdviolet.glacimon.java.io;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
/**
* 文件复制器Buffer版
*
* @author shepherdviolet
*/
public class BufferedFileCopyer {
/**
*
* 较快的复制文件方法（可监控复制进度）
* 目标文件的修改时间与原文件保持基本一致
* 目标文件修改时间可能会偏大,偏差<2000ms, 例如:
* 原始文件修改时间:****2356
* 目标文件修改时间:****4000
*
*
* @param source 源文件
* @param target 目标文件
*/
public static void copy(File source, File target) throws IOException {
copy(source, target, 4096);
}
/**
*
* 较快的复制文件方法（可监控复制进度）
* 目标文件的修改时间与原文件保持基本一致
* 目标文件修改时间可能会偏大,偏差<2000ms, 例如:
* 原始文件修改时间:****2356
* 目标文件修改时间:****4000
*
*
* @param source 源文件
* @param target 目标文件
* @param watcher 进度回调
*/
public static void copy(File source, File target, ProgressWatcher watcher) throws IOException {
copy(source, target, 64 * 1024, watcher);
}
private static void copy(File source, File target, int buffSize) throws IOException {
try (FileInputStream inStream = new FileInputStream(source); FileOutputStream outStream = new FileOutputStream(target)) {
try (FileChannel in = inStream.getChannel(); FileChannel out = outStream.getChannel()){
ByteBuffer buffer = ByteBuffer.allocate(buffSize);
while (in.read(buffer) != -1) {
buffer.flip();
out.write(buffer);
buffer.clear();
}
}
outStream.flush();
}
//使目标文件修改时间与源文件保持一致
long lastModified = source.lastModified();
//解决有时候取出负数, 无法设置时间的问题
if(lastModified < 0L) {
lastModified = 0L;
}
target.setLastModified(lastModified);
}
private static void copy(File source, File target, int buffSize, ProgressWatcher watcher) throws IOException {
try (FileInputStream inStream = new FileInputStream(source); FileOutputStream outStream = new FileOutputStream(target)) {
try (FileChannel in = inStream.getChannel(); FileChannel out = outStream.getChannel()){
ByteBuffer buffer = ByteBuffer.allocate(buffSize);
long total = source.length();
long current = 0;
while (in.read(buffer) != -1) {
buffer.flip();
current += buffer.limit();
out.write(buffer);
buffer.clear();
watcher.onUpdate(total, current);
}
}
outStream.flush();
}
//使目标文件修改时间与源文件保持一致
long lastModified = source.lastModified();
//解决有时候取出负数, 无法设置时间的问题
if(lastModified < 0L) {
lastModified = 0L;
}
target.setLastModified(lastModified);
}
public interface ProgressWatcher {
void onUpdate(long total, long current);
}
}