请用java写出一个从压缩包里拿出指定文件并解压到指定位置的方法

当然可以，请参考以下的Java代码：

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

public class UnzipUtil {

    public static void unzipFile(String zipFilePath, String destFolderPath, String targetFileName) {
        try {
            File destFolder = new File(destFolderPath);
            if (!destFolder.exists()) {
                destFolder.mkdirs();
            }

            ZipInputStream zipInputStream = new ZipInputStream(new FileInputStream(zipFilePath));
            ZipEntry zipEntry = zipInputStream.getNextEntry();

            while (zipEntry != null) {
                if (zipEntry.getName().equals(targetFileName)) {
                    String filePath = destFolderPath + File.separator + zipEntry.getName();
                    extractFile(zipInputStream, filePath);
                    break;
                }

                zipEntry = zipInputStream.getNextEntry();
            }

            zipInputStream.closeEntry();
            zipInputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static void extractFile(ZipInputStream zipInputStream, String filePath) throws IOException {
        BufferedOutputStream outputStream = new BufferedOutputStream(new FileOutputStream(filePath));
        byte[] buffer = new byte[1024];
        int bytesRead;

        while ((bytesRead = zipInputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, bytesRead);
        }

        outputStream.flush();
        outputStream.close();
    }

    public static void main(String[] args) {
        String zipFilePath = "path/to/your/zip/file.zip";
        String destFolderPath = "path/to/your/destination/folder";
        String targetFileName = "file-to-extract.txt";

        unzipFile(zipFilePath, destFolderPath, targetFileName);
    }
}

你需要将 `zipFilePath` 替换为压缩包的实际路径，`destFolderPath` 替换为你想要解压到的目标文件夹的路径，`targetFileName` 替换为你要解压的文件名。

这个方法会遍历压缩包中的文件，当找到指定的文件后，将其解压到指定位置。