java zip 分卷压缩

Java中可以使用ZipOutputStream类来实现分卷压缩。ZipOutputStream类是一个输出流，可以用来写入ZIP文件格式的数据。以下是一个示例代码，可以实现将大文件分卷压缩：

import java.io.*;
import java.util.zip.*;

public class ZipSplitter {
    public static void main(String[] args) throws Exception {
        String inputFileName = "input.txt";
        String outputFileName = "output.zip";
        int maxFileSize = 1024 * 1024; // 1MB
        
        // Open input stream
        FileInputStream inputStream = new FileInputStream(inputFileName);
        BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);
        
        // Open output stream
        FileOutputStream outputStream = new FileOutputStream(outputFileName);
        BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(outputStream);
        ZipOutputStream zipOutputStream = new ZipOutputStream(bufferedOutputStream);
        zipOutputStream.setMethod(ZipOutputStream.DEFLATED);
        
        // Split file into multiple parts
        byte[] buffer = new byte[maxFileSize];
        int partCount = 1;
        while (true) {
            // Read up to maxFileSize bytes from input stream
            int bytesRead = bufferedInputStream.read(buffer, 0, maxFileSize);
            if (bytesRead == -1) {
                break;
            }
            
            // Write part to output stream
            String partName = String.format("%s.%03d", inputFileName, partCount);
            ZipEntry zipEntry = new ZipEntry(partName);
            zipOutputStream.putNextEntry(zipEntry);
            zipOutputStream.write(buffer, 0, bytesRead);
            zipOutputStream.closeEntry();
            
            // Increment part count
            partCount++;
        }
        
        // Close streams
        bufferedInputStream.close();
        zipOutputStream.close();
    }
}

以上代码将会把文件 `input.txt` 分成多个部分，每个部分大小为 1MB，然后将这些部分保存在一个名为 `output.zip` 的文件中。每个部分的文件名格式为 `input.txt.001`、`input.txt.002` 等等。