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
完整代码在:https://gitee.com/sp42_admin/ajaxjs/blob/master/ajaxjs-base/src/main/java/com/ajaxjs/util/io/FileHelper.java
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;
public class ZipHelper {
private static final LogHelper LOGGER = LogHelper.getLog(ZipHelper.class);
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);
}
public static void zip(String toZip, String saveZip) {
zip(toZip, saveZip, null);
}
public static void zip(String toZip, String saveZip, Function 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);
}
private static void zip(File toZip, String fileName, ZipOutputStream zipOut, Function 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);
}
}
}
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