java定时任务将文件压缩为zip
时间: 2024-10-08 09:16:57 浏览: 8
在Java中,你可以使用`java.util.zip`包和`java.io.File`以及`java.util.Calendar`等类来实现定时任务将文件压缩为`.zip`文件。以下是一个简单的示例,展示了如何使用`ScheduledExecutorService`配合`ZipOutputStream`来定时执行这个操作:
```java
import java.io.*;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import javax.annotation.concurrent.ThreadSafe;
@ThreadSafe
public class FileArchiver {
private static final String ZIP_FILE_NAME = "archive.zip";
private final ScheduledExecutorService executorService;
private final long delayInMinutes; // 定义每多久执行一次压缩
public FileArchiver(ScheduledExecutorService executorService, long delayInMinutes) {
this.executorService = executorService;
this.delayInMinutes = delayInMinutes * 60 * 1000; // 将分钟转换成毫秒
}
public void start() {
executorService.scheduleAtFixedRate(this::doArchive, delayInMinutes, delayInMinutes, TimeUnit.MILLISECONDS);
}
private void doArchive() {
try {
Path zipFile = Paths.get(ZIP_FILE_NAME);
if (!Files.exists(zipFile)) {
createNewZipFile(zipFile);
} else {
addFilesToExistingZip(zipFile);
}
} catch (IOException e) {
// 处理异常
System.err.println("Error occurred while archiving files: " + e.getMessage());
}
}
private void createNewZipFile(Path zipPath) throws IOException {
FileOutputStream fos = new FileOutputStream(zipPath.toFile());
ZipOutputStream zos = new ZipOutputStream(fos);
// 添加文件到zip,这里假设你要压缩的是某个目录下的所有文件
addDirectoryToZip(zos, "/path/to/source/directory");
zos.close(); // 关闭流
}
private void addDirectoryToZip(ZipOutputStream zos, String directoryPath) throws IOException {
for (Path file : Files.walk(Paths.get(directoryPath))) {
if (!file.equals(directoryPath)) { // 避免添加目录本身
if (Files.isDirectory(file)) continue; // 如果是目录,则跳过
ZipEntry entry = new ZipEntry(file.relativize(directoryPath).toString());
zos.putNextEntry(entry);
Files.copy(file, zos);
zos.closeEntry();
}
}
}
private void addFilesToExistingZip(Path zipPath) throws IOException {
FileInputStream fis = new FileInputStream(zipPath.toFile());
ZipInputStream zis = new ZipInputStream(fis);
ZipEntry entry;
while ((entry = zis.getNextEntry()) != null) {
byte[] buffer = new byte[4096];
int length;
FileOutputStream fos = new FileOutputStream(zipPath.resolve(entry.getName()).toFile());
while ((length = zis.read(buffer)) >= 0) {
fos.write(buffer, 0, length);
}
zis.closeEntry();
fos.close();
}
zis.close();
}
}
// 使用场景
public static void main(String[] args) {
ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();
FileArchiver archiver = new FileArchiver(executor, 1); // 每隔1小时执行一次
archiver.start();
}
```
记得替换`addDirectoryToZip`方法中的`"/path/to/source/directory"`为你实际要压缩的目录路径。上述代码只是一个基本框架,你可能还需要添加错误处理和资源关闭机制。