前端上传文件及其他数据后台无法获取（已解决）_前台啊上传加密的excel文件,后台为啥无法读取-优快云博客

本文介绍如何在Tomcat环境下使用servlet3.0进行文件上传，并通过添加@MultipartConfig注解来实现getParameter方法获取上传参数的功能。

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由于Tomcat对于文件上传的请求做了处理，所有直接getParameter是获取不到的。由于我用的是servlet3.0，所以加了一个注解就可以了。贴代码：

package servlet;

import java.io.IOException;
import java.io.PrintWriter;

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 org.apache.ibatis.session.SqlSession;

import bean.VideoFile;
import util.Json;

/**
 * Servlet implementation class VideoFileUploadServilet
 */
@MultipartConfig()    //就是这个注解，让我的servlet可以通过getParameter获得参数
@WebServlet("/VideoFileUploadServlet")
public class VideoFileUploadServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public VideoFileUploadServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		VideoFile file = new VideoFile();
		file.input(request);
		
		String statement="mapping.VideoFileMapper.insertFile";
		file.setSavePath(util.FileUtil.fileUpload(request, this,"Video"));
		
		System.out.println(file);
		
		SqlSession session=util.DataUtil.getSqlSession();
		session.insert(statement,file);
		session.commit();
		session.close();
		Json json = new Json();
		System.out.println(file);
		json.addValue("isSuccess", file.getSavePath() != null);
		PrintWriter pw = response.getWriter();
		pw.println(json.getJSONArray());
		pw.close();
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}