网上找过几个例子都有点小问题,还是谷歌找出来的靠谱。主要是增加了指定文件的功能,通过 Java8 的 Lambda 判断是否加入 ZIP 压缩,比较方便。函数表达式的签名是 Function<File, Boolean>,参数是待加入的 File 对象,返回值 true 表示允许,反之不行。
/**
* Copyright sp42 frank@ajaxjs.com
*
* 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.
*/
package com.ajaxjs.util.io;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.function.Function;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;
import com.ajaxjs.util.logger.LogHelper;
/**
* ZIP 压缩/解压缩
*
* @author sp42
*
*/
public class ZipHelper {
private static final LogHelper LOGGER = LogHelper.getLog(ZipHelper.class);
/**
* 解压文件
*
* @param save 解压文件的路径,必须为目录
* @param zipFile 输入的解压文件路径,例如C:/temp/foo.zip或 c:\\temp\\bar.zip
*/
public static void unzip(String save, String zipFile) {
if (!new File(save).isDirectory())
throw new IllegalArgumentException("保存的路径必须为目录路径");
long start = System.currentTimeMillis();
File folder = new File(save);
if (!folder.exists())
folder.mkdirs();
try (ZipInputStream zis = new ZipInputStream(new FileInputStream(zipFile));) {
ZipEntry ze;
while ((ze = zis.getNextEntry()) != null) {
File newFile = new File(save + File.separator + ze.getName());
System.out.println("file unzip : " + newFile.getAbsoluteFile());
// 大部分网络上的源码,这里没有判断子目录
if (ze.isDirectory()) {
newFile.mkdirs();
} else {
// new File(newFile.getParent()).mkdirs();
FileHelper.initFolder(newFile);
FileOutputStream fos = new FileOutputStream(newFile);
IoHelper.write(zis, fos, false);
fos.close();
}
// ze = zis.getNextEntry();
}
zis.closeEntry();
} catch (IOException e) {
LOGGER.warning(e);
}
LOGGER.info("解压缩完成,耗时:{0}ms,保存在{1}", System.currentTimeMillis() - start, save);
}
/**
* 压缩文件
*
* @param toZip 要压缩的目录或文件
* @param saveZip 压缩后保存的 zip 文件名
*/
public static void zip(String toZip, String saveZip) {
zip(toZip, saveZip, null);
}
/**
* 压缩文件
*
* @param toZip 要压缩的目录或文件
* @param saveZip 压缩后保存的 zip 文件名
* @param everyFile 输入 File,可在这 Lambda 里面判断是否加入 ZIP 压缩,返回 true 表示允许,反之不行
*/
public static void zip(String toZip, String saveZip, Function<File, Boolean> everyFile) {
long start = System.currentTimeMillis();
File fileToZip = new File(toZip);
FileHelper.initFolder(saveZip);
try (FileOutputStream fos = new FileOutputStream(saveZip); ZipOutputStream zipOut = new ZipOutputStream(fos);) {
zip(fileToZip, fileToZip.getName(), zipOut, everyFile);
} catch (IOException e) {
LOGGER.warning(e);
}
LOGGER.info("压缩完成,耗时:{0}ms,保存在{1}", System.currentTimeMillis() - start, saveZip);
}
/**
* 内部的压缩方法
*
* @param toZip 要压缩的目录或文件
* @param fileName ZIP 内的文件名
* @param zipOut ZIP 流
* @param everyFile 输入 File,可在这 Lambda 里面判断是否加入 ZIP 压缩,返回 true 表示允许,反之不行
*/
private static void zip(File toZip, String fileName, ZipOutputStream zipOut, Function<File, Boolean> everyFile) {
if (toZip.isHidden())
return;
if (everyFile != null && !everyFile.apply(toZip)) {
return; // 跳过不要的
}
try {
if (toZip.isDirectory()) {
zipOut.putNextEntry(new ZipEntry(fileName.endsWith("/") ? fileName : fileName + "/"));
zipOut.closeEntry();
File[] children = toZip.listFiles();
for (File childFile : children) {
zip(childFile, fileName + "/" + childFile.getName(), zipOut, everyFile);
}
return;
}
zipOut.putNextEntry(new ZipEntry(fileName));
try (FileInputStream in = new FileInputStream(toZip);) {
IoHelper.write(in, zipOut, false);
}
} catch (IOException e) {
LOGGER.warning(e);
}
}
}
转载:https://blog.csdn.net/zhangxin09/article/details/104351033
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