SpringBoot文件上传

1. 页面

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


    


    

        上传图片
        
        
    
    
图片:
    

2. controller

package com.rainy.controller;

import org.apache.catalina.servlet4preview.http.HttpServletRequest;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

import java.io.*;
import java.util.UUID;


@Controller
public class FileController {

    @GetMapping(value = "/file")
    public String file() {
        return "file";
    }

    @PostMapping(value = "/fileUpload")
    public String fileUpload(@RequestParam(value = "file") MultipartFile file, Model model, HttpServletRequest request) {
        if (file.isEmpty()) {
            System.out.println("文件为空空");
        }
        String fileName = file.getOriginalFilename();  // 文件名
        String suffixName = fileName.substring(fileName.lastIndexOf("."));  // 后缀名
        String filePath = "D://temp-rainy//"; // 上传后的路径
        fileName = UUID.randomUUID() + suffixName; // 新文件名
        File dest = new File(filePath + fileName);
        if (!dest.getParentFile().exists()) {
            dest.getParentFile().mkdirs();
        }
        try {
            file.transferTo(dest);
        } catch (IOException e) {
            e.printStackTrace();
        }
        String filename = "/temp-rainy/" + fileName;
        model.addAttribute("filename", filename);
        return "file";
    }
}

3. 配置资源映射路径

@Configuration
public class MyWebAppConfigurer implements WebMvcConfigurer {
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/temp-rainy
public class FileUtil {
 
    public static void uploadFile(byte[] file, String filePath, String fileName) throws Exception {
        File targetFile = new File(filePath);
        if(!targetFile.exists()){
            targetFile.mkdirs();
        }
        FileOutputStream out = new FileOutputStream(filePath+fileName);
        out.write(file);
        out.flush();
        out.close();
    }
 
}

 @Resource
 HttpServletRequest request;

 //处理文件上传
 @RequestMapping(value="/testuploadimg", method = RequestMethod.POST)
 public @ResponseBody String uploadImg(@RequestParam("file") MultipartFile file) {
     String fileName = file.getOriginalFilename();
     //设置文件上传路径
     String filePath = request.getSession().getServletContext().getRealPath("imgupload/");
     try {
         FileUtil.uploadFile(file.getBytes(), filePath, fileName);
         return "上传成功";
     } catch (Exception e) {
         return "上传失败";
     }
 }