Java，SpringBoot，MultipartFile，表单处理上传文件上传，代码

　　背景
　　SpringBoot，2.3.9.RELEASE，表单上传文件，案例代码。案例
　　后台代码 package com.what21.demo.controller;  import lombok.extern.slf4j.Slf4j; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.multipart.MultipartFile; import org.springframework.web.multipart.MultipartHttpServletRequest;  import javax.servlet.http.HttpServletRequest; import java.io.File; import java.io.IOException; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Set;  @Controller @RequestMapping(＂/upload＂) @Slf4j public class FileUploadController {      @RequestMapping(value = ＂/show＂, method = {RequestMethod.GET, RequestMethod.POST})     @ResponseBody     public Object show(HttpServletRequest request) {         Map dataMap = new HashMap<>();         dataMap.put(＂code＂, ＂ok＂);         dataMap.put(＂status＂, ＂success＂);         return dataMap;     }      @RequestMapping(value = ＂/multiUpload＂, method = {RequestMethod.GET, RequestMethod.POST})     @ResponseBody     public Object multiUpload(HttpServletRequest request) {         Map dataMap = new HashMap<>();         dataMap.put(＂code＂, ＂ok＂);         // ===================================================================================//         // ===== 解析参数&保存文件         // ===================================================================================//         String storagePath = ＂D:/Temp/Upload/＂;         // 多文件         MultipartHttpServletRequest multipartHttpRequest = (MultipartHttpServletRequest) request;         Map multipartFileMap = multipartHttpRequest.getFileMap();         Set keySet = multipartFileMap.keySet();         for (String key : keySet) {             MultipartFile multipartFile = multipartFileMap.get(key);             if (multipartFile.isEmpty()) {                 continue;             }             String fileName = multipartFile.getOriginalFilename();             try {                 File dest = new File(storagePath + fileName);                 multipartFile.transferTo(dest);             } catch (IOException e) {                 e.printStackTrace();             }         }         // ===================================================================================//         // ===== 返回结果         // ===================================================================================//         return dataMap;     }      @RequestMapping(value = ＂/multiUpload2＂, method = {RequestMethod.GET, RequestMethod.POST})     @ResponseBody     public Object multiUpload2(HttpServletRequest request) {         Map dataMap = new HashMap<>();         dataMap.put(＂code＂, ＂ok＂);         // ===================================================================================//         // ===== 解析参数&保存文件         // ===================================================================================//         String storagePath = ＂D:/Temp/Upload/＂;         // 多文件         MultipartHttpServletRequest multipartHttpRequest = (MultipartHttpServletRequest) request;         List multipartFileList = multipartHttpRequest.getFiles(＂files＂);         String filePath = storagePath;         for (int i = 0; i < multipartFileList.size(); i++) {             MultipartFile file = multipartFileList.get(i);             if (file.isEmpty()) {                 continue;             }             String fileName = file.getOriginalFilename();             File dest = new File(filePath + fileName);             try {                 file.transferTo(dest);             } catch (IOException e) {                 e.printStackTrace();             }         }         // ===================================================================================//         // ===== 返回结果         // ===================================================================================//         return dataMap;     }  }
　　配置类： /**  * 允许不规范 URL 访问  * @return  */ @Bean public HttpFirewall httpFirewall() {     return new DefaultHttpFirewall(); }
　　前端代码：                                                  
Form表单上传
                                                                           
Form表单上传