我正在编写一个 android 应用程序,我需要从几个文件夹中读取几个文件并将它们添加到几个 zip 档案中。我需要将档案的最大大小限制为 16mb。因此,在运行时,如果文件的大小超过 16 mb,则在将文件添加到存档时创建另一个具有相同大小限制的存档,依此类推。我正在使用以下包装类:
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
public class ChunkedZippedOutputStream {
private ZipOutputStream zipOutputStream;
private String path;
private String name;
private long currentSize;
private int currentChunkIndex;
private final long MAX_FILE_SIZE = 16 * 1000 * 1024; // 16mb limit
private final String PART_POSTFIX = ".part";
private final String FILE_EXTENSION = ".zip";
public ChunkedZippedOutputStream(String path, String name) throws FileNotFoundException {
this.path = path;
this.name = name;
constructNewStream();
}
public void addEntry(ZipEntry entry) throws IOException {
long entrySize = entry.getCompressedSize();
if ((currentSize + entrySize) > MAX_FILE_SIZE) {
closeStream();
constructNewStream();
} else {
currentSize += entrySize;
zipOutputStream.putNextEntry(entry);
}
}
private void closeStream() throws IOException {
zipOutputStream.close();
}
private void constructNewStream() throws FileNotFoundException {
zipOutputStream = new ZipOutputStream(new FileOutputStream(new File(path, constructCurrentPartName())));
currentChunkIndex++;
currentSize = 0;
}
private String constructCurrentPartName() {
// This will give names is the form of <file_name>.part.0.zip, <file_name>.part.1.zip, etc.
StringBuilder partNameBuilder = new StringBuilder(name);
partNameBuilder.append(PART_POSTFIX);
partNameBuilder.append(currentChunkIndex);
partNameBuilder.append(FILE_EXTENSION);
return partNameBuilder.toString();
}
}
我像这样使用它:
String zipPath = Environment.getExternalStorageDirectory() + "/MyApp/MyFolder/Zip/";
String zipName = "MyZipFle";
ChunkedZippedOutputStream zippedOutputStream = new ChunkedZippedOutputStream(zipPath, zipName);
....
zippedOutputStream.addEntry(new ZipEntry("ZipEntry" + i));
但是 ChunkedZippedOutputStream 对象的实例化我得到这个错误:
java.io.FileNotFoundException: /mnt/sdcard/MyApp/MyFolder/Zip/MyZipFle.part0.zip (No such file or directory)
我知道我在路径输入或名称上做错了,但我不知道是什么。
另外,如果代码片段不正确,请告诉我,我从这里得到了如何将一个巨大的 zip 文件拆分为多个卷?
如果我的问题有更简单的解决方案,请告诉我。谢谢