Spring Bootd单/多文件上传

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单/多文件上传

upload.html：

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<!DOCTYPE HTML>
<html>
<head>
    <title>文件上传</title>
</head>

<body>
<form action="/upload" enctype="multipart/form-data" method="post">
    上传文件1：<input type="file" name="file"><br/>
    <input type="submit" value="提交">
</form>
</body>
</html>

UploadController:

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package com.example.demo.controller;

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;
import org.springframework.web.multipart.MultipartHttpServletRequest;

import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.util.List;

@Controller
public class UploadController {
    @GetMapping("/upload")
    public String upload() {
        return "upload";
    }

    @GetMapping("/multiUpload")
    public String multiUpload() {
        return "multiUpload";
    }


    @PostMapping("/multiUpload")
    @ResponseBody
    public String multiUpload(HttpServletRequest request) {
        List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles("file");
        String filePath = "D:/path/";
        for (int i = 0; i < files.size(); i++) {
            MultipartFile file = files.get(i);
            if (file.isEmpty()) {
                return "上传第" + (i++) + "个文件失败";
            }
            String fileName = file.getOriginalFilename();

            File dest = new File(filePath + fileName);
            try {
                file.transferTo(dest);
            } catch (IOException e) {
                return "上传第" + (i++) + "个文件失败";
            }
        }

        return "上传成功";

    }


    @PostMapping("/upload")
    @ResponseBody
    public String upload(@RequestParam("file") MultipartFile file) {
        if (file.isEmpty()) {
            return "上传失败，请选择文件";
        }

        String fileName = file.getOriginalFilename();
        String filePath = "D:/path/";
        File dest = new File(filePath + fileName);
        try {
            file.transferTo(dest);
            return "上传成功";
        } catch (IOException e) {
        }
        return "上传失败！";
    }
}


multiUpload.html

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<!DOCTYPE HTML>
<html>
<head>
    <title>文件上传</title>
</head>

<body>
<form action="/multiUpload" enctype="multipart/form-data" method="post">
    上传文件：<input type="file" name="file"><br/>
    上传文件：<input type="file" name="file"><br/>
    上传文件：<input type="file" name="file"><br/>
    上传文件：<input type="file" name="file"><br/>
    <input type="submit" value="提交">
</form>
</body>
</html>

设置上传文件大小的两种方式

springboot 1.5.X系列处理方式

创建tomcat配置类

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@Bean  
   public MultipartConfigElement multipartConfigElement() {  
       MultipartConfigFactory factory = new MultipartConfigFactory();  
       //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();  
   }

注意
spring.http.multipart.maxFileSize=10Mb
spring.http.multipart.maxRequestSize=10Mb
已经过期 >>>>

在application.properties中添加如下配置信息

application.properties

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spring.servlet.multipart.max-file-size=20MB
spring.servlet.multipart.max-request-size=20MB

maxFileSize 是单个文件大小
maxRequestSize是设置总上传的数据大小

Springboot 2.X系列配置

创建tomcat配置类

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@Configuration
public class TomcatConfig {


    @Bean
    public MultipartConfigElement multipartConfigElement() {
        MultipartConfigFactory factory = new MultipartConfigFactory();
        //文件最大10M,DataUnit提供5中类型B,KB,MB,GB,TB
        factory.setMaxFileSize(DataSize.of(100, DataUnit.MEGABYTES));
        /// 设置总上传数据总大小10M
        factory.setMaxRequestSize(DataSize.of(100, DataUnit.MEGABYTES));
        return factory.createMultipartConfig();
    }
}

配置文件配置

application.properties

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spring.servlet.multipart.max-file-size=20MB
spring.servlet.multipart.max-request-size=20MB