Spring Boot文件上传(七)

1.单个文件上传

在templates下创建file文件夹,并在文件夹中创建file.ftl,文件内容如下:

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org"  
      xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
<head>
<meta charset="UTF-8" />
<title>Insert title here</title>
</head>
<body>
    <h1 th:inlines="text">文件上传</h1>
    <form action="fileUpload" method="post" enctype="multipart/form-data">
        <p>选择文件: <input type="file" name="fileName"/></p>
        <p><input type="submit" value="提交"/></p>
    </form>
</body>
</html>

定义路径,访问跳转到该页面:

    @RequestMapping("/file")
    public String file(){
        return "file/file";
    }

对上传文件的后端处理如下:

  @RequestMapping("/fileUpload")
    @ResponseBody 
    public String fileUpload(@RequestParam("fileName") MultipartFile file){
        if(file.isEmpty()){
            return "false";
        }
        String fileName = file.getOriginalFilename();
        int size = (int) file.getSize();
        System.out.println(fileName + "-->" + size);
        
        String path = "F:/test" ;
        File dest = new File(path + "/" + fileName);
        if(!dest.getParentFile().exists()){ //判断文件父目录是否存在
            dest.getParentFile().mkdir();
        }
        try {
            file.transferTo(dest); //保存文件
            return "true";
        } catch (IllegalStateException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return "false";
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return "false";
        }
    }

输入网址:http://localhost:8080/file即可进行测试。

2.文件的批量提交

前端页面代码为:

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org"  
      xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
<head>
<meta charset="UTF-8" />
<title>Insert title here</title>
</head>
<body>
    <h1 th:inlines="text">文件上传</h1>
    <form action="multifileUpload" method="post" enctype="multipart/form-data" >
        <p>选择文件1: <input type="file" name="fileName"/></p>
        <p>选择文件2: <input type="file" name="fileName"/></p>
        <p>选择文件3: <input type="file" name="fileName"/></p>
        <p><input type="submit" value="提交"/></p>
    </form>
</body>
</html>

后台处理代码如下:

/**
     * 实现多文件上传
 **/
    @RequestMapping(value="multifileUpload",method=RequestMethod.POST) 
    @ResponseBody
    public  String multifileUpload(@RequestParam("fileName")List<MultipartFile> files) {
    	//这样接收也可以
//    public String multifileUpload(HttpServletRequest request){
//        
//        List<MultipartFile> files = ((MultipartHttpServletRequest)request).getFiles("fileName");
        
        if(files.isEmpty()){
            return "false";
        }

        String path = "F:/test" ;
        
        for(MultipartFile file:files){
            String fileName = file.getOriginalFilename();
            int size = (int) file.getSize();
            System.out.println(fileName + "-->" + size);
            
            if(file.isEmpty()){
                return "false";
            }else{        
                File dest = new File(path + "/" + fileName);
                if(!dest.getParentFile().exists()){ //判断文件父目录是否存在
                    dest.getParentFile().mkdir();
                }
                try {
                    file.transferTo(dest);
                }catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                    return "false";
                } 
            }
        }
        return "true";
    }

多文件上传页面为:

3.文件下载处理

访问一个路径,将返回的response.setContentType("application/force-download")设置一下即可访问连接进行下载,完整代码实例如下:

 @RequestMapping("download")
    public String downLoad(HttpServletResponse response){
        String filename="cloudmusic.exe";
        String filePath = "F:/test" ;
        File file = new File(filePath + "/" + filename);
        if(file.exists()){ //判断文件父目录是否存在
            response.setContentType("application/force-download");
            response.setHeader("Content-Disposition", "attachment;fileName=" + filename);
            
            byte[] buffer = new byte[1024];
            FileInputStream fis = null; //文件输入流
            BufferedInputStream bis = null;
            
            OutputStream os = null; //输出流
            try {
                os = response.getOutputStream();
                fis = new FileInputStream(file); 
                bis = new BufferedInputStream(fis);
                int i = bis.read(buffer);
                while(i != -1){
                    os.write(buffer);
                    i = bis.read(buffer);
                }
                
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            System.out.println("----------file download" + filename);
            try {
                bis.close();
                fis.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return null;
    }

4.上传文件上限设置

(1)通过配置文件设置

##单个文件
spring.servlet.multipart.max-file-size=50MB
##总共
spring.servlet.multipart.max-request-size=50MB

(2)通过Bean配合,在启动类中添加如下代码:

    @Bean  
    public MultipartConfigElement multipartConfigElement() {  
        MultipartConfigFactory factory = new MultipartConfigFactory();  
        //单个文件最大  
        factory.setMaxFileSize("10240KB"); //KB,MB  
        /// 设置总上传数据总大小  
        factory.setMaxRequestSize("102400KB");  
        return factory.createMultipartConfig();  
    }  

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转载自blog.csdn.net/qq_36831305/article/details/92796458