java拆分zip
时间: 2023-06-30 20:17:00 浏览: 96
你可以使用 Java 的 ZipInputStream 和 ZipEntry 类来实现拆分 zip 文件。以下是一个示例代码,可以将一个 zip 文件拆分成多个部分:
```java
import java.io.*;
import java.util.zip.*;
public class ZipSplitter {
public static void main(String[] args) throws Exception {
String zipFile = "example.zip";
int chunkSize = 1024 * 1024; // 1 MB
int part = 1;
try (ZipInputStream zis = new ZipInputStream(new FileInputStream(zipFile))) {
ZipEntry entry;
while ((entry = zis.getNextEntry()) != null) {
String partName = String.format("%s.part%03d", entry.getName(), part);
try (BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(partName));
SplitterOutputStream sos = new SplitterOutputStream(bos, chunkSize)) {
byte[] buffer = new byte[4096];
int bytesRead;
while ((bytesRead = zis.read(buffer)) != -1) {
sos.write(buffer, 0, bytesRead);
}
}
part++;
}
}
}
}
class SplitterOutputStream extends FilterOutputStream {
private final int chunkSize;
private int bytesWritten;
public SplitterOutputStream(OutputStream out, int chunkSize) {
super(out);
this.chunkSize = chunkSize;
this.bytesWritten = 0;
}
@Override
public void write(int b) throws IOException {
out.write(b);
bytesWritten++;
if (bytesWritten >= chunkSize) {
out.flush();
bytesWritten = 0;
}
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
int remainingBytes = chunkSize - bytesWritten;
if (len <= remainingBytes) {
out.write(b, off, len);
bytesWritten += len;
} else {
out.write(b, off, remainingBytes);
out.flush();
bytesWritten = 0;
write(b, off + remainingBytes, len - remainingBytes);
}
}
}
```
这段代码将输入的 zip 文件拆分成多个部分,每个部分大小为 1MB。每个部分的命名格式为原始文件名加上 ".part" 和部分编号。例如,如果原始文件名为 "example.zip",则拆分后的第一个部分的文件名为 "example.zip.part001"。
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