用SpringBoot做一个文件上传_文件上传javaspringboot-优快云博客

本文链接：https://blog.youkuaiyun.com/JiangLi_/article/details/105295392

本文详细介绍了如何在SpringBoot 2.1.5版本中实现文件上传功能，包括必要的依赖引入及核心代码实现。通过使用MultipartFile接口处理上传文件，实现了文件的服务器端存储，并返回了可供访问的网络路径。

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这里使用的是SpringBoot2.1.5版本

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

需要引入的依赖

<dependencies>
    <dependency>
        <groupId>com.aliyun</groupId>
        <artifactId>aliyun-java-sdk-multimediaai</artifactId>
        <version>1.1.0</version>
    </dependency>
    <dependency>
        <groupId>com.aliyun</groupId>
        <artifactId>aliyun-java-sdk-core</artifactId>
        <version>[4.3.2,5.0.0)</version>
    </dependency>
    <dependency>
        <groupId>commons-io</groupId>
        <artifactId>commons-io</artifactId>
        <version>2.4</version>
    </dependency>

    <dependency>
        <groupId>commons-fileupload</groupId>
        <artifactId>commons-fileupload</artifactId>
        <version>1.3.1</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-web</artifactId>
          <exclusions>
              <exclusion>
                  <groupId>org.springframework.boot</groupId>
                  <artifactId>spring-boot-starter-tomcat</artifactId>
              </exclusion>
          </exclusions>
     </dependency>
     <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-tomcat</artifactId>
          <scope>provided</scope>
     </dependency>

</dependencies>

SpringBoot文件上传的核心代码类

package com.rongpan.controller;


import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

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

@RestController
@RequestMapping("/default")
public class UploadFileController {

    @PostMapping("/upload")
    public String upload(@RequestParam("fileName") MultipartFile uploadFile, HttpServletRequest request){
        String realPath = request.getSession().getServletContext().getRealPath("/uploadFile/");
        File dir = new File(realPath);
        if (!dir.isDirectory()) {//文件目录不存在，就创建一个
            dir.mkdirs();
        }
        try {
            String filename = new Date().getTime()+"-"+uploadFile.getOriginalFilename();
            //服务端保存的文件对象
            File fileServer = new File(dir, filename);
            System.out.println("file文件真实路径:" + fileServer.getAbsolutePath());
            //2，实现上传
            uploadFile.transferTo(fileServer);
            String filePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + "/uploadFile/" + filename;
            //3，返回可供访问的网络路径
            return filePath;
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "上传失败";
    }
}