Springboot文件上传代码笔记

时间：2024-07-11 21:07:26

1.在src下创建filter包，包内Class名UploadFilter

package com.gd.filter;

import org.apache.catalina.servlet4preview.http.HttpServletRequest;

import javax.servlet.*;

import javax.servlet.annotation.WebFilter;

import javax.servlet.http.HttpServletResponse;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

@WebFilter(urlPatterns = "/upload/*", filterName = "uploadFilter")

public class UploadFilter implements Filter {

    //定义文件路径常量

    public static final File UPLOAD_FOLDER = new File("F:\\nginx-1.14.2\\html\\upload");//修改上传路径

    @Override

    public void init(FilterConfig filterConfig) throws ServletException {

        System.out.println("初始化uploadFilter");

    }

    @Override

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {

        //转换ServletRequest request类型

        HttpServletRequest req = (HttpServletRequest) request;

        String uri = req.getRequestURI();

        int index = uri.lastIndexOf("/");

        String fileName = uri.substring(index + 1);

        File file = new File(UploadFilter.UPLOAD_FOLDER, fileName);

        //输入流

        FileInputStream fileInputStream = new FileInputStream(file);

        byte[] bs = new byte[(int) file.length()];

        fileInputStream.read(bs);

        //关闭流

        fileInputStream.close();

        //转换ServletResponse response类型

        HttpServletResponse resp = (HttpServletResponse) response;

        resp.getOutputStream().write(bs);

        System.out.println("---请求进入--");

    }

    @Override

    public void destroy() {

    }

}

2.在控制层（controller）编写交互接口

package com.gd.controller;

import com.gd.filter.UploadFilter;

import org.apache.catalina.servlet4preview.http.HttpServletRequest;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestParam;

import org.springframework.web.bind.annotation.ResponseBody;

import org.springframework.web.bind.annotation.RestController;

import org.springframework.web.multipart.MultipartFile;

import java.io.File;

import java.io.IOException;

@RestController

public class UploadController {

    /**

     * 文件上传

     *

     * @param multipartFile

     * @param request

     * @return

     */

    @RequestMapping("/uploadFile")

    public String uploadFile(@RequestParam("multipartFile") MultipartFile multipartFile,HttpServletRequest request) {

        System.out.println(multipartFile.getOriginalFilename());

        System.out.println("上传的文件夹路径：" + UploadFilter.UPLOAD_FOLDER);

        if (UploadFilter.UPLOAD_FOLDER.exists() == false) {

            UploadFilter.UPLOAD_FOLDER.mkdirs();

        }

        //准备用来接收数据的文件

        File uploadFile = new File(UploadFilter.UPLOAD_FOLDER, multipartFile.getOriginalFilename());

        try {

            multipartFile.transferTo(uploadFile);

        } catch (IOException e) {

            e.printStackTrace();

        }

        return "ok";

    }

}

3.前端页面上传入口静态页面

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

</head>

<body>

<form action="/uploadFile" method="post" enctype="multipart/form-data">

    <input type="file" name="multipartFile">

    <input type="submit" value="提交">

</form>

</body>

</html>

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