图片或文件上传到服务器或从服务器上读取（图片可根据路径src回显展示，从服务器上读出来）

不需要配置虚拟路径，存的时候数据库里只存了图片的名称（随机重命名的形式），存在指定服务器上，取的时候也是根据图片名称从服务器上找到，并用OutputStream 读出来

前台页面（用的bootstrap）：

html代码（可回显，回显的时候也是去后台根据路径查找到图片）：

   

      营业执照：
   
   

      
      
   
   

       

       

           
       
           
   
   


   

       
   

js：

后台：

UserCompleteController：

package com.buba.witkey.controller;

import com.buba.witkey.pojo.UserComplete;
import com.buba.witkey.service.UserCompleteService;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@RequestMapping("/corporation")
@Controller
public class UserCompleteController {
    @Resource
    private UserCompleteService userCompleteService;

   
    @RequestMapping("/sendFile1")
    @ResponseBody
    public Map sendFile1(MultipartFile file1, HttpSession session){
        Map map = new HashMap<>();
        map.put("flag",true);
        String realPath = session.getServletContext().getRealPath("/uploads/lisence");
        File temp = new File(realPath);
        if(!temp.exists()){
            //如果不存在，就新建一个路径
            temp.mkdir();
        }
        String filename = file1.getOriginalFilename();
        //限制上传的文件必须是图片，通过后缀名的方式
        String suffix = filename.substring(filename.lastIndexOf(".") + 1);
        if(!suffix.matches("^(?i)[(PNG)|(GIF)|(JPG)|(JPEG)]+$")){
            map.put("flag",false);
            map.put("message","请上传图片！");
            return map;
        }
        //如果图片超过512M，返回false
        if(file1.getSize()>512*1024*1024){
            map.put("flag",false);
            map.put("message","文件不支持>512KB!");
            return map;
        }
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
        String format = sdf.format(new Date());
        filename = filename.substring(0,filename.lastIndexOf("."))+"_"+format+filename.substring(filename.lastIndexOf("."));
        File f = new File(realPath+File.separator+filename);
        try {
            file1.transferTo(f);
        } catch (IOException e) {
            e.printStackTrace();
            map.put("flag",false);
            map.put("message","上传失败，详细信息为："+e.getMessage());
            return map;
        }
        map.put("filename",filename);
        return map;
    }
    
    @RequestMapping("/updateCorporation")
    @ResponseBody
    public boolean updateCorporation(UserComplete uc){
        int ucs = userCompleteService.updateCorporation(uc);
        if(ucs!=0){
            return true;
        }
        return false;
    }
   
    @RequestMapping("/showImages/{image:.+}")
    public void showImages(@PathVariable String image, HttpSession session, HttpServletResponse response){
        System.out.println("图片名称为："+image);
        //获取存储图片的绝对路径
        String realPath = session.getServletContext().getRealPath("/uploads/lisence");
        File file  = new File(realPath+File.separator+image);
        try(FileInputStream fin = new FileInputStream(file);
            OutputStream out = response.getOutputStream();
        ) {
            byte[] buffer = new byte[1024];
            int count = 0;
            while ((count=fin.read(buffer))!=-1){
                out.write(buffer,0,count);
                out.flush();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

又over了！再见大兄弟们！