13_springboot文件上传

1.upLoadPage.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>

<form action="upload" method="post" enctype="multipart/form-data">
    选择图片:<input type="file" name="file" accept="image/*" /> <br>
    <input type="submit" value="上传">
</form>

2.UploadController

package com.example.demo_zhang.web;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

@Controller
public class UploadController {

    @RequestMapping("/uploadPage")
    public String uploadPage() {
        return "uploadPage";
    }

    @RequestMapping(value = "/upload", method = RequestMethod.POST)
    public String upload(HttpServletRequest req, @RequestParam("file") MultipartFile file,Model m) {
        try {
            //文件名+时间戳，File.separator相当于“/”
            String fileName = System.currentTimeMillis()+file.getOriginalFilename();
            String destFileName=req.getServletContext().getRealPath("")+"uploaded"+File.separator+fileName;

            //创建目录
            File destFile = new File(destFileName);
            destFile.getParentFile().mkdirs();

            //将图片移到指定目录下
            file.transferTo(destFile);

            m.addAttribute("fileName",fileName);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            return "上传失败," + e.getMessage();
        } catch (IOException e) {
            e.printStackTrace();
            return "上传失败," + e.getMessage();
        }

        return "showImg";
    }
}

3.application.properties加入以下内容，设置文件大小

spring.http.multipart.maxFileSize=100Mb
spring.http.multipart.maxRequestSize=100Mb

4.showImg.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<img src="/uploaded/${fileName}">

5.运行，http://127.0.0.1:8080/uploadPage，且上传文件后跳转至http://127.0.0.1:8080/upload