java分割zip文件
时间: 2023-11-29 18:03:46 浏览: 34
你可以使用Java的ZipInputStream和ZipEntry类来读取Zip文件,并使用Java的FileOutputStream和BufferedOutputStream类将Zip文件拆分成多个部分。以下是一个示例代码,将Zip文件分割成指定大小的部分:
```java
import java.io.*;
import java.util.zip.*;
public class ZipSplitter {
public static void main(String[] args) throws Exception {
String sourceZipFile = "source.zip";
int splitSizeInMB = 10;
FileInputStream fileInputStream = new FileInputStream(sourceZipFile);
BufferedInputStream bufferedInputStream = new BufferedInputStream(fileInputStream);
ZipInputStream zipInputStream = new ZipInputStream(bufferedInputStream);
byte[] buffer = new byte[1024];
int bytesRead;
int currentPart = 1;
long currentSize = 0;
long splitSize = splitSizeInMB * 1024 * 1024;
ZipEntry entry;
while ((entry = zipInputStream.getNextEntry()) != null) {
String entryName = entry.getName();
System.out.println("File: " + entryName + " (" + entry.getSize() + " bytes)");
FileOutputStream fileOutputStream = new FileOutputStream("part" + currentPart + ".zip");
BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(fileOutputStream);
ZipOutputStream zipOutputStream = new ZipOutputStream(bufferedOutputStream);
long entrySize = entry.getSize();
while ((bytesRead = zipInputStream.read(buffer)) != -1) {
if (currentSize + bytesRead > splitSize && entrySize > splitSize) {
zipOutputStream.closeEntry();
zipOutputStream.finish();
bufferedOutputStream.close();
fileOutputStream.close();
currentPart++;
currentSize = 0;
fileOutputStream = new FileOutputStream("part" + currentPart + ".zip");
bufferedOutputStream = new BufferedOutputStream(fileOutputStream);
zipOutputStream = new ZipOutputStream(bufferedOutputStream);
entrySize -= splitSize;
}
zipOutputStream.write(buffer, 0, bytesRead);
currentSize += bytesRead;
if (currentSize >= entrySize) {
break;
}
}
zipOutputStream.closeEntry();
zipOutputStream.finish();
bufferedOutputStream.close();
fileOutputStream.close();
currentPart++;
currentSize = 0;
}
zipInputStream.close();
bufferedInputStream.close();
fileInputStream.close();
}
}
```
请注意,此示例代码仅适用于拆分Zip文件中的单个文件。如果Zip文件包含多个文件,则需要修改代码以同时处理所有文件。