在Java中重置文件上传的InputStream

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

public class FileUploadResetExample {
    public static void main(String[] args) {
        String filePath = "path/to/uploaded/file.txt";

        try {
            // 创建文件输入流
            InputStream inputStream = new FileInputStream(filePath);

            // 使用BufferedInputStream包装输入流，提高读取效率
            BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);

            // 读取文件内容
            byte[] buffer = new byte[1024];
            int bytesRead = bufferedInputStream.read(buffer);

            // 打印文件内容
            System.out.println("File content before reset:");
            System.out.println(new String(buffer, 0, bytesRead));

            // 标记当前位置
            bufferedInputStream.mark(0);

            // 重新读取文件内容
            bytesRead = bufferedInputStream.read(buffer);

            // 打印重新读取的文件内容
            System.out.println("File content after reset:");
            System.out.println(new String(buffer, 0, bytesRead));

            // 重置流的位置到标记处
            bufferedInputStream.reset();

            // 重新读取文件内容
            bytesRead = bufferedInputStream.read(buffer);

            // 打印重新读取的文件内容
            System.out.println("File content after reset and re-read:");
            System.out.println(new String(buffer, 0, bytesRead));

            // 关闭流
            bufferedInputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}