如何利用springboot、thymeleaf和jquery实现多文件图片上传功能

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如何利用springboot、thymeleaf和jquery实现多文件图片上传功能




    
    
    上传页
    



    
        
            
            
            如上传图片:会展示最后一个上传的图片: 
            上传                                                 
    
    
        下载文件名:                                
# 文件路径, 注意路径末尾一定要带上/
user.file.path=E:/upload/
package com.example.springboot_jxc_0511.common;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

/**
 * 参考:https://blog.csdn.net/sinat_34104446/article/details/100178488
 */
@Component
public class CustomWebConfiguration implements WebMvcConfigurer {
    @Value("${user.file.path}")
    private String filePath;

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {

        // 注意如果filePath是写死在这里,一定不要忘记尾部的/或者\\,这样才能读取其目录下的文件
        registry.addResourceHandler("/**").addResourceLocations(
                "classpath:/META-INF/resources/",
                "classpath:/resources/",
                "classpath:/static/",
                "classpath:/public/",
                "file:/" + filePath,
                "classpath:/webapp/");
    }
}
package com.example.springboot_jxc_0511.common;

import javax.servlet.http.HttpServletResponse;
import java.io.*;

public class FileUtil {
    public static void download(String filename, HttpServletResponse res) throws IOException {
        // 发送给客户端的数据
        OutputStream outputStream = res.getOutputStream();
        byte[] buff = new byte[1024];
        BufferedInputStream bis = null;
        // 读取filename
        bis = new BufferedInputStream(new FileInputStream(new File("e:/upload/" + filename)));
        int i = bis.read(buff);
        while (i != -1) {
            outputStream.write(buff, 0, buff.length);
            outputStream.flush();
            i = bis.read(buff);
        }
    }
}
package com.example.springboot_jxc_0511.common;


import com.baomidou.mybatisplus.core.metadata.OrderItem;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.example.springboot_jxc_0511.common.FileUtil;
import com.example.springboot_jxc_0511.jxc.common.Constants;
import com.example.springboot_jxc_0511.jxc.entity.Product;
import com.example.springboot_jxc_0511.jxc.entity.Sale;
import com.example.springboot_jxc_0511.jxc.entity.Users;
import com.example.springboot_jxc_0511.jxc.service.IProductService;
import com.example.springboot_jxc_0511.jxc.service.ISaleService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Date;
import java.util.List;

/**
 * 

 * 前端控制器  * 

 *  * @author gongxl  * @since 2021-05-11  */ @Controller @RequestMapping public class UploadController {     @Value("${user.file.path}")     private String filePath;     /**      * @Author GongXl      * @Description      * @Date 2021/5/20 14:44      * @Param [model]      * @return java.lang.String      **/     @RequestMapping("/toUpload")     public String toUpload(Model model) {         return "upload";     }     /**      * @Author GongXl      * @Description 单文件上传      * @Date 2021/5/20 14:47      * @Param [file, model]      * @return java.lang.String      **/     @PostMapping("/uploadFile")     public String upload(@RequestParam("file") MultipartFile file, Model model){         if (file.isEmpty()){             model.addAttribute("message", "The file is empty!");             return "upload";         }         try{             byte[] bytes = file.getBytes();             Path path = Paths.get(filePath + file.getOriginalFilename());             Files.write(path, bytes);             model.addAttribute("message", "succes");         }catch (Exception e){             e.printStackTrace();         }         return "upload";     }     /**      * 多文件上传      * @param request      * @param model      * @return      */     @PostMapping("/multiUpload")     public String multiUpload(HttpServletRequest request, Model model) {         List files = ((MultipartHttpServletRequest) request).getFiles("file");         File fileTemp =  new File(filePath);         //判断文件父目录是否存在         if(!fileTemp.exists()){             //不存在就创建一个             fileTemp.mkdirs();         }         for (int i = 0; i < files.size(); i++) {             MultipartFile file = files.get(i);             if (file.isEmpty()) {                 model.addAttribute("message", "上传第"+i+"个文件失败。");             }             String fileName = file.getOriginalFilename();             File dest = new File(filePath + fileName);             try {                 file.transferTo(dest);                 System.out.println(dest.getAbsolutePath());                 model.addAttribute("message", "succes");                 model.addAttribute("filePath","/"+fileName);             } catch (IOException e) {                 model.addAttribute("message", "上传异常");             }         }         return "upload";     }     /**      * 下载文件      * @param fileName      * @throws IOException      */     @RequestMapping(value = "/download/{fileName:.+}")     public void download(@PathVariable String fileName) throws IOException {         ServletRequestAttributes requestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();         HttpServletResponse response = requestAttributes.getResponse();         // 设置信息给客户端不解析         String type = fileName.substring(fileName.lastIndexOf(".")+1);         // 设置contenttype,即告诉客户端所发送的数据属于什么类型         response.setHeader("Content-type",type);         // 设置编码         String hehe = new String(fileName.getBytes("utf-8"), "iso-8859-1");         // 设置扩展头,当Content-Type 的类型为要下载的类型时 , 这个信息头会告诉浏览器这个文件的名字和类型。         response.setHeader("Content-Disposition", "attachment;filename=" + hehe);         FileUtil.download(fileName, response);     } }


    4.0.0
    
        org.springframework.boot
        spring-boot-starter-parent
        2.4.5
         
    
    com.example
    springboot_jxc_0511
    0.0.1-SNAPSHOT
    springboot_jxc_0511
    Demo project for Spring Boot
    
        1.8
    
    
        
            org.springframework.boot
            spring-boot-starter-thymeleaf
        
        
            org.springframework.boot
            spring-boot-starter-web
        

        
            MySQL
            mysql-connector-java
            runtime
        
        
            org.projectlombok
            lombok
            true
        
        
            com.baomidou
            mybatis-plus-boot-starter
            3.4.2
        
        
            com.baomidou
            mybatis-plus-generator
            3.4.1
        
        
            org.apache.velocity
            velocity-engine-core
            2.3
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        

        
        
            org.webjars
            webjars-locator
            0.40
        
        
        
            org.webjars.bower
            jquery
            3.6.0
        
        
        
            org.webjars
            bootstrap
            5.0.0
        
        
        
            org.webjars
            layui
            2.5.7
        

    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
                
                    
                        
                            org.projectlombok
                            lombok
                        
                    
                
            
        
    

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