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项目

新建 Spring Starter Project，编辑 pom.xml 文件，引入依赖：

   
       
    
     4.0.0
        
            
     
      org.springframework.boot
             
     
      spring-boot-starter-parent
             
     
      2.3.3.RELEASE
             
      
         
        
    
     com.mk
        
    
     spring-boot-XMLHttpRequest-upload
        
    
     1.0.0
        
    
     spring-boot-XMLHttpRequest-upload
        
    
     Demo project for Spring Boot
        
            
     
      1.8
         
        
            
                 
      
       org.springframework.boot
                  
      
       spring-boot-starter-thymeleaf
              
             
                 
      
       org.springframework.boot
                  
      
       spring-boot-starter-web
              
             
                 
      
       org.springframework.boot
                  
      
       spring-boot-devtools
                  
      
       runtime
                  
      
       true
              
             
                 
      
       org.springframework.boot
                  
      
       spring-boot-configuration-processor
                  
      
       true
              
             
                 
      
       org.projectlombok
                  
      
       lombok
                  
      
       true
              
             
                 
      
       org.springframework.boot
                  
      
       spring-boot-starter-test
                  
      
       test
                  
                      
                           
        
         org.junit.vintage
                            
        
         junit-vintage-engine
                        
                   
              
             
             
                 
      
       commons-io
                  
      
       commons-io
                  
      
       2.6
              
         
        
            
                 
                      
       
        org.springframework.boot
                       
       
        spring-boot-maven-plugin
                       
                           
         
          
          
           org.springframework.boot
           
          
           spring-boot-configuration-processor
           
          
          
          
           org.projectlombok
           
          
           lombok
           
          
                        
                   
              
         
    
   

编辑 application.yml 文件，设置上传文件的大小限制：

spring:  servlet:    multipart:      max-file-size: 200MB      max-request-size: 1000MB

IndexController 控制器：

package com.mk.controller;import java.io.File;import java.io.IOException;import javax.servlet.http.HttpServletRequest;import org.springframework.stereotype.Controller;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.bind.annotation.ResponseBody;import org.springframework.web.multipart.MultipartFile;@Controllerpublic class IndexController {
       @GetMapping({
   "", "/index"})    public String index() {
           return "index";    }        @PostMapping("/upload")    @ResponseBody    public String upload(HttpServletRequest request,            @RequestParam(value = "file", required = false) MultipartFile file,            String filename) throws IllegalStateException, IOException {
                   String authorization = request.getHeader("Authorization");        System.out.println(authorization);                String originalFilename = file.getOriginalFilename();        file.transferTo(new File("G:/20191212", originalFilename));                return filename;    }}

src/main/resources/templates/index.html 文件：

参考