在Part和String上执行循环复制JSP/JEE

<form action="upload" method="post" enctype="multipart/form-data">
    <input type="file" name="files" multiple>
    <input type="submit" value="Upload">
</form>

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;

@WebServlet("/upload")
@MultipartConfig
public class FileUploadServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        for (Part part : request.getParts()) {
            String fileName = Paths.get(part.getSubmittedFileName()).getFileName().toString();
            // 复制文件到目标目录
            part.write("uploads/" + fileName);
        }
        response.getWriter().println("Files uploaded successfully.");
    }
}

public class StringCopyExample {
    public static void main(String[] args) {
        String originalString = "Hello";
        int numberOfCopies = 5;
        StringBuilder result = new StringBuilder();

        for (int i = 0; i < numberOfCopies; i++) {
            result.append(originalString);
        }

        System.out.println(result.toString()); // 输出 "HelloHelloHelloHelloHello"
    }
}