Spring Boot : 文件上传(八)

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本文介绍如何使用Spring Boot实现单文件及多文件上传功能，并提供两种文件大小限制配置方案。

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文件上传

添加pom.xml包支持

    <!-- thymeleaf支持 -->
  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-thymeleaf</artifactId>
  </dependency>

页面:

这里写图片描述

fileupload.html

<!DOCTYPE html>
<html>
<head>
    <title>文件上传示例</title>
</head>
<body>
<h2>文件上传示例</h2>
<hr/>
<form method="POST" enctype="multipart/form-data" action="/upload">
    <p>
        文件：<input type="file" name="file" />
    </p>
    <p>
        <input type="submit" value="上传" />
    </p>
</form>
</body>
</html>

mutifileupload.html

<!DOCTYPE html>
<html>
<head>
    <title>批量文件上传示例</title>
</head>
<body>
<h2>批量文件上传示例</h2>
<hr/>
<form method="POST" enctype="multipart/form-data"
      action="/upload/batch">
    <p>
        文件1：<input type="file" name="file" />
    </p>
    <p>
        文件2：<input type="file" name="file" />
    </p>
    <p>
        文件3：<input type="file" name="file" />
    </p>
    <p>
        <input type="submit" value="上传" />
    </p>
</form>
</body>
</html>

FileUploadController.java

package cn.milo.controllor;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;

import javax.servlet.http.HttpServletRequest;

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.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;

/**
 * Created by admin on 2017/8/25.
 * 代码摘自 :http://blog.youkuaiyun.com/catoop/article/details/61415169
 */
@Controller
public class FileUploadController {

    // 访问路径为：http://ip:port/upload
    @RequestMapping(value = "/upload", method = RequestMethod.GET)
    public String upload() {
        return "/fileupload";
    }

    // 访问路径为：http://ip:port/upload/batch
    @RequestMapping(value = "/upload/batch", method = RequestMethod.GET)
    public String batchUpload() {
        return "/mutifileupload";
    }

    /**
     * 单文件
     */
    @RequestMapping(value = "/upload", method = RequestMethod.POST)
    @ResponseBody
    public String upload(@RequestParam("file") MultipartFile file) {
        if (!file.isEmpty()) {
            try {
                // 这里只是简单例子，文件直接输出到项目路径下。
                // 实际项目中，文件需要输出到指定位置，需要在增加代码处理。
                // 还有关于文件格式限制、文件大小限制，详见：中配置。
                BufferedOutputStream out = new BufferedOutputStream(
                        new FileOutputStream(new File(file.getOriginalFilename())));
                out.write(file.getBytes());
                out.flush();
                out.close();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
                return "上传失败," + e.getMessage();
            } catch (IOException e) {
                e.printStackTrace();
                return "上传失败," + e.getMessage();
            }
            return "上传成功";
        } else {
            return "上传失败，因为文件是空的.";
        }
    }

    /**
     * 多文件
     */
    @RequestMapping(value = "/upload/batch", method = RequestMethod.POST)
    public @ResponseBody String batchUpload(HttpServletRequest request) {
        List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles("file");
        MultipartFile file = null;
        BufferedOutputStream stream = null;
        for (int i = 0; i < files.size(); ++i) {
            file = files.get(i);
            if (!file.isEmpty()) {
                try {
                    byte[] bytes = file.getBytes();
                    stream = new BufferedOutputStream(new FileOutputStream(new File(file.getOriginalFilename())));
                    stream.write(bytes);
                    stream.close();
                } catch (Exception e) {
                    stream = null;
                    return "You failed to upload " + i + " => " + e.getMessage();
                }
            } else {
                return "You failed to upload " + i + " because the file was empty.";
            }
        }
        return "upload successful";
    }
}

文件大小设置

方式一:

FileUploadConfiguration.java

package cn.milo.controllor;

import javax.servlet.MultipartConfigElement;

import org.springframework.boot.web.servlet.MultipartConfigFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;


@Configuration
public class FileUploadConfiguration {

    @Bean
    public MultipartConfigElement multipartConfigElement() {
        MultipartConfigFactory factory = new MultipartConfigFactory();
        // 设置文件大小限制 ,超出设置页面会抛出异常信息，
        // 这样在文件上传的地方就需要进行异常信息的处理了;
        factory.setMaxFileSize("1000KB"); // KB,MB
        /// 设置总上传数据总大小
        factory.setMaxRequestSize("2000KB");
        // Sets the directory location where files will be stored.
        // factory.setLocation("路径地址");
        return factory.createMultipartConfig();
    }
}

一般放在启动类:

    @Configuration  
    @SpringBootApplication  
    public class Application {  

        public static void main(String[] args) throws Exception {  
            SpringApplication.run(Application.class, args);  
        }  


        /**  
         * 文件上传配置  
         * @return  
         */  
        @Bean  
        public MultipartConfigElement multipartConfigElement() {  
            MultipartConfigFactory factory = new MultipartConfigFactory();  
            //文件最大  
            factory.setMaxFileSize("1000KB"); //KB,MB  
            /// 设置总上传数据总大小  
            factory.setMaxRequestSize("2000KB");  
            return factory.createMultipartConfig();  
        }  

    }

方式二:在application.yml中添加配置

spring:
  http:
   multipart:
    maxFileSize: 1000KB
    maxRequestSize : 2000KB

Spring Boot : 文件上传(八)

目录

文件上传

文件大小设置