java上传xml文件

以下是Java上传XML文件的示例代码：

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
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 UploadServlet extends HttpServlet {
	
	private static final long serialVersionUID = 1L;
	
	private static final String UPLOAD_DIR = "uploads";
	
	@Override
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		//获取上传文件的目录
		String uploadPath = getServletContext().getRealPath("") + File.separator + UPLOAD_DIR;
		File uploadDir = new File(uploadPath);
		if (!uploadDir.exists()) {
			uploadDir.mkdir();
		}
		
		//获取上传的文件
		Part filePart = request.getPart("file");
		String fileName = getFileName(filePart);
		Path filePath = Paths.get(uploadPath, fileName);
		Files.copy(filePart.getInputStream(), filePath);
		
		//处理上传的文件
		//TODO
		
		response.getWriter().append("File uploaded successfully!");
	}
	
	private String getFileName(final Part part) {
		final String partHeader = part.getHeader("content-disposition");
		for (String content : partHeader.split(";")) {
			if (content.trim().startsWith("filename")) {
				return content.substring(content.indexOf('=') + 1).trim().replace("\"", "");
			}
		}
		return null;
	}
}

在上面的代码中，我们使用了Servlet 3.0提供的@MultipartConfig注解来支持文件上传。该注解表明该Servlet支持文件上传，并且指定上传文件的临时目录。在doPost方法中，我们首先获取上传文件的目录，如果该目录不存在则创建。然后获取上传的文件，将其保存到指定的目录中。最后我们可以在处理上传的文件之前，将上传的文件名输出到控制台上。