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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-axios-download-file
        
    
     1.0.0
            
    
     spring-boot-axios-download-file
            
            
     
      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
              
             
             
                 
      
       commons-io
                  
      
       commons-io
                  
      
       2.6
              
         
        
            
                 
                      
       
        org.springframework.boot
                       
       
        spring-boot-maven-plugin
                       
                           
         
          
          
           org.springframework.boot
           
          
           spring-boot-configuration-processor
           
          
          
          
           org.projectlombok
           
          
           lombok
           
          
                        
                   
              
         
    
   

IndexController 控制器：

package com.mk.controller;import java.io.File;import java.io.IOException;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.io.FileUtils;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.GetMapping;@Controllerpublic class IndexController {
       @GetMapping({
   "", "/index"})    public String index() {
           return "index";    }        @GetMapping("/download")    public void download(HttpServletRequest request, HttpServletResponse response) throws IOException {
           String authorization = request.getHeader("Authorization");        System.out.println(authorization);                byte[] bytes = FileUtils.readFileToByteArray(new File("E:/stm32/w25q128fv rev.m 05132016 kms.pdf"));                ServletOutputStream os = response.getOutputStream();                response.setHeader("Content-Type", "application/pdf");                os.write(bytes);        os.flush();        os.close();    }}

启动类：

package com.mk;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class Application {
       public static void main(String[] args) {
           SpringApplication.run(Application.class, args);    }}

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

参考