用SpringBoot做一個文件上傳

這裏使用的是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>

需要引入的依賴

<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文件上傳的核心代碼類

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()) {//文件目錄不存在，就創建一個
            dir.mkdirs();
        }
        try {
            String filename = new Date().getTime()+"-"+uploadFile.getOriginalFilename();
            //服務端保存的文件對象
            File fileServer = new File(dir, filename);
            System.out.println("file文件真實路徑:" + fileServer.getAbsolutePath());
            //2，實現上傳
            uploadFile.transferTo(fileServer);
            String filePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + "/uploadFile/" + filename;
            //3，返回可供訪問的網絡路徑
            return filePath;
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "上傳失敗";
    }
}