java - Android 中 ZIP 文件夹中的 par baseName 是什么？

Question

以下代码来自 What is a good Java library to zip/unzip files? 上的文章

代码将一个文件夹以及所有包含的文件和子文件夹压缩到一个 zip 文件中。

我不明白 par BaseName 是什么意思，以及如何将值传递给 par baseName ？

private void addFolderToZip(File folder, ZipOutputStream zip, String baseName) throws IOException {
    File[] files = folder.listFiles();
    for (File file : files) {
        if (file.isDirectory()) {
            addFolderToZip(file, zip, baseName);
        } else {
            String name = file.getAbsolutePath().substring(baseName.length());
            ZipEntry zipEntry = new ZipEntry(name);
            zip.putNextEntry(zipEntry);
            IOUtils.copy(new FileInputStream(file), zip);
            zip.closeEntry();
        }
    }
}

Answer 1

假设这是目录结构:

mnt/sdcard/Android/data/testzip/ 是所有要归档的文件的目录，如下所示 tobezipped 目录:

mnt/sdcard/Android/data/testzip/tobezipped/1.txt
mnt/sdcard/Android/data/testzip/tobezipped/directory/2.txt

如果我们要对以上所有的文件和目录进行归档，我们需要为归档文件提供一个名称，并将其命名为zipcreated.zip，在该目录下创建

mnt/sdcard/Android/data/testzip/ as mnt/sdcard/Android/data/testzip/zipcreated.zip

下面是归档目录的代码:

new Thread(new Runnable() {
  @Override
  public void run() {

    // Moves the current Thread into the background
    android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_BACKGROUND);

    //tobezipped holds the content of the directory or folder to be zipped
    //zipcreated.zip zips or archive holds the contents of the tobezipped after archived

    ZipUtils.createZipFileOfDirectory("mnt/sdcard/Android/data/testzip/tobezipped/",
        "mnt/sdcard/Android/data/testzip/zipcreated.zip");
  }
}).start();

============================================= ===========================

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import org.apache.commons.io.IOUtils;
/**
* Created by Android Studio
* User: Anurag Singh
* Date: 28/2/17
* Time: 2:14 PM
*/

public class ZipUtils {

private static final String TAG = ZipUtils.class.getSimpleName();

public static void createZipFileOfDirectory(String srcDir, String zipOutput) {

try{

  File srcDirFile = new File(srcDir);
  File zipOutputFile = new File(zipOutput);

  if ( !srcDirFile.exists() || !srcDirFile.isDirectory() ) {
    throw new IllegalArgumentException(
        srcDirFile.getAbsolutePath() + " is not a directory!");
  }
  if ( zipOutputFile.exists() && !zipOutputFile.isFile() ) {
    throw new IllegalArgumentException(
        zipOutputFile.getAbsolutePath() + " exists but is not a file!");
  }

  ZipOutputStream zipOutputStream = null;
  String baseName = srcDirFile.getAbsolutePath() + File.pathSeparator;

  try {
    zipOutputStream = new ZipOutputStream(new FileOutputStream(zipOutput));
    addDirToZip(srcDirFile, zipOutputStream, baseName);
  } finally {
    IOUtils.close(zipOutputStream);
  }
}catch(Exception e){
  e.printStackTrace();
}
}


private static void addDirToZip(File dir, ZipOutputStream zip, String baseName) throws IOException {
File[] files = dir.listFiles();

for (File file : files) {
  if (file.isDirectory()) {
    addDirToZip(file, zip, baseName);
  } else {
    String entryName = file.getAbsolutePath().substring(
        baseName.length());
    ZipEntry zipEntry = new ZipEntry(entryName);
    zip.putNextEntry(zipEntry);

    FileInputStream fileInput = new FileInputStream(file);
    try {
      IOUtils.copy(fileInput, zip);
      zip.closeEntry();
    } finally {
      IOUtils.close(fileInput);
    }
  }
}
}
}

什么是 baseName？

baseName用于ZipUtils.addDirToZip()中对entryName的支持，从中获取要归档的文件或目录名这种情况。

baseName=/mnt/sdcard/Android/data/testzip/tobezipped:
entryName=1.txt
entryName=directory2/2.txt

基本上，基本名称只是目录 mnt/sdcard/Android/data/testzip/tobezipped/ 下的文件名。 entryName 不能是 directory2 因为它是一个目录。