spring-boot中实现分片上传文件

一、上传文件基本实现

• 1、前端效果图展示，这里使用element-ui plus来展示样式效果

• 2、基础代码如下

  <template>
    <div
      >
      <el-upload
        ref="uploadRef"
        class="upload-demo"
        :limit="1"
        :on-change="handleExceed"
        :auto-upload="false"
      >
        <template #trigger>
          <el-button type="primary">选择文件</el-button>
        </template>
        <el-button style="margin-left: 30px" type="success" @click="submitUpload"> 上传 </el-button>
      </el-upload>
    </div>
  </template>
  
  <script setup>
    import { ref } from 'vue';
  
    import axios from 'axios';
  
    const fileRef = ref(null);
  
    const handleExceed = (files) => {
      console.log(files);
      fileRef.value = files;
    };
  
    const submitUpload = () => {
      console.log('开始上传文件', JSON.stringify(fileRef.value));
      const formData = new FormData();
      formData.append('file', fileRef.value.raw);
      axios.post('http://localhost:9002/file/upload', formData).then((res) => {
        console.log(fileRef.value, '??');
        console.log('上传成功');
      });
    };
  </script>
  
  <style lang="scss" scoped></style>
  
  

• 3、定义后端接口，并且处理好跨域(关于跨域处理，自己百度处理)

  package com.course.file.controller;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.web.bind.annotation.PostMapping;
  import org.springframework.web.bind.annotation.RequestParam;
  import org.springframework.web.bind.annotation.RestController;
  import org.springframework.web.multipart.MultipartFile;
  
  @RestController
  public class UploadController {
      private static final Logger LOG = LoggerFactory.getLogger(UploadController.class);
      @PostMapping("/upload")
      public String uploadApi(@RequestParam MultipartFile file) {
          this.LOG.info("上传文件开始");
          this.LOG.info(file.getOriginalFilename());
          this.LOG.info(String.valueOf(file.getSize()));
          return "上传成功";
      }
  }
  

• 4、保存文件到本地文件

  package com.course.file.controller;
  
  import com.course.file.utils.UuidUtil;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.web.bind.annotation.PostMapping;
  import org.springframework.web.bind.annotation.RequestParam;
  import org.springframework.web.bind.annotation.RestController;
  import org.springframework.web.multipart.MultipartFile;
  
  import java.io.File;
  import java.io.IOException;
  
  @RestController
  public class UploadController {
      private static final Logger LOG = LoggerFactory.getLogger(UploadController.class);
  
      @PostMapping("/upload")
      public String uploadApi(@RequestParam MultipartFile file) throws IOException {
          this.LOG.info("上传文件开始");
          this.LOG.info(file.getOriginalFilename());
          this.LOG.info(String.valueOf(file.getSize()));
          // 保存文件到本地
          String fileName = file.getOriginalFilename();
          String key = UuidUtil.getShortUuid();
          // 需要先本地创建一个file文件夹
          String fullPath = "E:/file/" + key + "-" + fileName;
          File dest = new File(fullPath);
          file.transferTo(dest);
          return "上传成功";
      }
  }
  

二、配置静态目录

• 1、在FileApplication.java旁边添加一个SpringMvcConfig.java的文件

  package com.course.file;
  
  import org.springframework.context.annotation.Configuration;
  import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
  import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
  
  @Configuration
  public class SpringMvcConfig implements WebMvcConfigurer {
      @Override
      public void addResourceHandlers(ResourceHandlerRegistry registry) {
          registry.addResourceHandler("/f/**").addResourceLocations("file:E:/file/");
      }
      // http://localhost:9002/file/f/FdXMQJdF-xx.png
  }
  

• 2、直接浏览器上直接访问上面的地址

• 3、上传地址返回给前端

  @RestController
  public class UploadController {
      private static final Logger LOG = LoggerFactory.getLogger(UploadController.class);
  
      @PostMapping("/upload")
      public String uploadApi(@RequestParam MultipartFile file) throws IOException {
          this.LOG.info("上传文件开始");
          this.LOG.info(file.getOriginalFilename());
          this.LOG.info(String.valueOf(file.getSize()));
          // 保存文件到本地
          String fileName = file.getOriginalFilename();
          String key = UuidUtil.getShortUuid();
          // 需要先本地创建一个file文件夹
          String fullPath = "E:/file/" + key + "-" + fileName;
          File dest = new File(fullPath);
          file.transferTo(dest);
          return "http://localhost:9002/file/f/" + key + "-" + fileName;
      }
  }
  

• 4、将上面几个固定的配置写到配置文件中

  file.path=E:/file/
  file.domain=http://localhost:9002/file/
  # 修改上传文件大小(不设置大文件可能上传失败)
  spring.servlet.multipart.max-file-size=50MB
  spring.servlet.multipart.max-request-size=50MB
  

• 5、在控制器中使用

  public class UploadController {
      private static final Logger LOG = LoggerFactory.getLogger(UploadController.class);
      @Value("${file.path}")
      private String FILE_PATH;
  
      @Value("${file.domain}")
      private String FILE_DOMAIN;
  }
  

三、断点续传

• 1、主要原理

  • 前端将大文件根据文件大小来切割成小片段，使用递归的方式调用后端接口，将文件上传到服务器端
  • 服务器端接收到前端上传片段，存储到服务器上
  • 等前端最后一个上传完成后，将全部的文件合并成一个文件
  • 合并完成后，返回一个url地址，将之前的分片上传的文件删除

• 2、手动演示前端分段上传

  const submitUpload = () => {
      console.log('开始上传文件', JSON.stringify(fileRef.value));
      const formData = new FormData();
      const file = fileRef.value.raw;
      // 文件分配
      let shardSize = 5 * 1024 * 1024; // 以5MB为一个分片
      let shardIndex = 0; // 分片索引
      let start = shardIndex * shardSize; // 开始位置
      let end = Math.min(file.size, start + shardSize); // 结束位置
      let fileShard = file.slice(start, end); // 每次上传的分片数据
      formData.append('file', fileShard);
      axios.post('http://localhost:9002/file/upload', formData).then((res) => {
        console.log(fileRef.value, '??');
        console.log('上传成功');
      });
    };
  

• 3、第二次的时候将shardIndex改为1

• 4、查看本地文件夹下的文件

  

• 5、手动创建一个接口来尝试合并文件

  @GetMapping("merge")
      public String merge() throws FileNotFoundException {
          // 最终合成后的视频文件名称
          File newFile = new File(FILE_PATH + "test.mp4");
          FileOutputStream outputStream = new FileOutputStream(newFile, true);
          FileInputStream fileInputStream = null;
          byte[] bytes = new byte[5 * 1024 * 1024];
          int len;
          try {
              // 读取第一段
              fileInputStream = new FileInputStream(new File(FILE_PATH + "/pN0EoOny-blob"));
              while ((len = fileInputStream.read(bytes)) != -1) {
                  outputStream.write(bytes, 0, len);
              }
              // 读取第二段
              fileInputStream = new FileInputStream(new File(FILE_PATH + "/f5oeIEDW-blob"));
              while ((len = fileInputStream.read(bytes)) != -1) {
                  outputStream.write(bytes, 0, len);
              }
              // 读取第三段
              fileInputStream = new FileInputStream(new File(FILE_PATH + "/qsm8n03q-blob"));
              while ((len = fileInputStream.read(bytes)) != -1) {
                  outputStream.write(bytes, 0, len);
              }
          } catch (IOException e) {
              LOG.error("合并分片失败", e);
          } finally {
              try {
                  if (fileInputStream != null) {
                      fileInputStream.close();
                  }
                  outputStream.close();
                  LOG.info("IO流关闭");
              } catch (IOException e) {
                  LOG.error("IO流关闭", e);
              }
          }
          return "合并视频成功";
      }
  

四、使用数据库来实现分片上传

• 1、数据表字段

  在数据库中涉及key只跟文件有关,跟上传多少片没关系的，当已经上传的分片数和分片总数一样的时候就合并文件

  drop table if exists `file`;
  create table `file` (
    `id` int(11) not null PRIMARY key auto_increment comment '主键id',
    `path` varchar(100) not null comment '相对路径',
    `name` varchar(100) comment '文件名',
    `suffix` varchar(10) comment '后缀',
    `size` int(11) comment '大小|字节B',
  	`shard_index` int(11) DEFAULT 0 COMMENT '已上传分片',
  	`shard_size` int(11) DEFAULT 0 COMMENT '分片大小',
  	`shard_total` int(11) DEFAULT 0 COMMENT '分片总数',
  	`key` VARCHAR(100) DEFAULT NULL COMMENT '文件标识',
    `created_at` timestamp(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6) COMMENT '创建时间',
    `updated_at` timestamp(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6) ON UPDATE CURRENT_TIMESTAMP(6) COMMENT '更新时间',
    `deleted_at` timestamp(6) NULL DEFAULT NULL COMMENT '软删除时间'
  ) engine=innodb default charset=utf8mb4 comment='文件';
  

• 2、在pom.xml文件中添加mybatis-plus的依赖包

  <!--    配置连接到数据库    -->
  <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.26</version>
  </dependency>
  <!--   mybatis plus 依赖包  -->
  <dependency>
      <groupId>com.baomidou</groupId>
      <artifactId>mybatis-plus-boot-starter</artifactId>
      <version>3.2.0</version>
  </dependency>
  
  <!--    mybatis 代码生成器    -->
  <dependency>
      <groupId>com.baomidou</groupId>
      <artifactId>mybatis-plus-generator</artifactId>
      <version>3.2.0</version>
  </dependency>
  

• 3、application.properties添加配置

  # mysql数据库链接
  spring.datasource.url=jdbc:mysql://localhost:3306/beego?characterEncoding=utf-8&serverTimezone=GMT%2B8
  spring.datasource.username=root
  spring.datasource.password=123456
  
  # 配置mybatis-plus
  # 开启下划线转驼峰
  mybatis-plus.configuration.map-underscore-to-camel-case=true 
  mybatis-plus.configuration.auto-mapping-behavior=full
  mybatis-plus.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl
  # mapping的路径
  mybatis-plus.mapper-locations=classpath*:mapper/**/*Mapper.xml
  #主键类型  AUTO:"数据库ID自增", INPUT:"用户输入ID", ID_WORKER:"全局唯一ID (数字类型唯一ID)", UUID:"全局唯一ID UUID";
  mybatis-plus.global-config.db-config.id-type=AUTO
  # 逻辑删除(软删除)
  mybatis-plus.global-config.db-config.logic-delete-value=NOW()
  mybatis-plus.global-config.db-config.logic-not-delete-value=NULL
  

• 4、使用模板生成器生成代码

• 5、前端使用递归的方式来分片上传文件

  <script setup>
    import { ref } from 'vue';
    import { genFileId } from 'element-plus';
    import axios from 'axios';
    import md5 from 'js-md5';
  
    const fileRef = ref(null);
  
    const handleExceed = (files) => {
      console.log(files);
      fileRef.value = files;
    };
  
    const updateFile = (shardIndex) => {
      const formData = new FormData();
      const file = fileRef.value.raw;
      // 文件分配
      let shardSize = 5 * 1024 * 1024; // 以5MB为一个分片
      // let shardIndex = 0; // 分片索引
      let start = (shardIndex - 1) * shardSize; // 开始位置
      let end = Math.min(file.size, start + shardSize); // 结束位置
      let fileShard = file.slice(start, end); // 每次上传的分片数据
      // 前端多上传参数
      let size = file.size;
      let shardTotal = Math.ceil(size / shardSize); // 总片数
      const suffix = file.name.substring(file.name.lastIndexOf('.') + 1);
      formData.append('shard', fileShard);
      formData.append('shardIndex', shardIndex);
      formData.append('shardSize', shardSize);
      formData.append('shardTotal', shardTotal);
      formData.append('name', file.name);
      formData.append('size', size);
      formData.append('suffix', suffix); 
      formData.append('key', md5(`${file.name}_${file.size}_${file.type}`));
  
      axios.post('http://localhost:9002/file/upload1', formData).then((res) => {
        // 判断如果当前的shardIndex < shardTotal的时候递归上传
        if (shardIndex < shardTotal) {
          updateFile(++shardIndex);
        } else {
          console.log('上传成功');
        }
      });
    };
    const submitUpload = () => {
      console.log('开始上传文件', JSON.stringify(fileRef.value));
      // 开始上传文件
      updateFile(1);
    };
  </script>
  

• 6、后端对文件上传处理，存储到本地和入库操作

  package com.course.file.controller;
  
  import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
  import com.course.file.model.FileEntity;
  import com.course.file.service.IFileService;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.beans.factory.annotation.Value;
  import org.springframework.web.bind.annotation.PostMapping;
  import org.springframework.web.bind.annotation.RequestParam;
  import org.springframework.web.bind.annotation.RestController;
  import org.springframework.web.multipart.MultipartFile;
  
  import java.io.File;
  import java.io.IOException;
  
  @RestController
  public class FileController {
      @Autowired
      private IFileService fileService;
      private static final Logger LOG = LoggerFactory.getLogger(FileController.class);
      @Value("${file.path}")
      private String FILE_PATH;
  
      @Value("${file.domain}")
      private String FILE_DOMAIN;
  
      @PostMapping("upload1")
      public String upload1(
              @RequestParam MultipartFile shard,
              Integer shardIndex,
              Integer shardSize,
              Integer shardTotal,
              String name,
              String suffix,
              Integer size,
              String key
      ) throws IOException {
          this.LOG.info("开始上传文件");
          System.out.println("当前分片:" + shardIndex);
          System.out.println("当前分片大小:" + shardSize);
          System.out.println("当前分片总数:" + shardTotal);
          System.out.println("文件名称:" + name);
          System.out.println("文件后缀名:" + suffix);
          System.out.println("文件大小:" + size);
          System.out.println("文件唯一的key:" + key);
          // 文件保存到本地目录下
          String localPath = this.FILE_PATH + key + "." + suffix + "." + shardIndex;
          File dest = new File(localPath);
          shard.transferTo(dest);
          LOG.info(dest.getAbsolutePath());
          // 数据入库操作
          LambdaQueryWrapper<FileEntity> queryWrapper = new LambdaQueryWrapper<>();
          queryWrapper.eq(FileEntity::getFileKey, key);
          FileEntity fileEntity = new FileEntity();
          if (this.fileService.getOne(queryWrapper) != null) {
              // 说明不是第一次上传,需要更新当前上传的分片数量
              fileEntity.setShardIndex(shardIndex);
              if (this.fileService.update(fileEntity, queryWrapper)) {
                  return "上传成功";
              } else {
                  return "上传失败";
              }
          } else {
              // 第一次上传创建
              String path = this.FILE_PATH + key + "." + suffix;
              fileEntity.setFileKey(key);
              fileEntity.setName(name);
              fileEntity.setPath(path);
              fileEntity.setShardIndex(shardIndex);
              fileEntity.setSuffix(suffix);
              fileEntity.setShardSize(shardSize);
              fileEntity.setShardTotal(shardTotal);
              fileEntity.setSize(size);
              if (this.fileService.save(fileEntity)) {
                  return "上传成功";
              } else {
                  return "上传失败";
              }
          }
      }
  }
  

• 7、查看本地目录是否生成分片文件

  

• 8、对本地分片文件合并操作，当shardIndex=shardTotal的时候进行合并操作

  @RestController
  public class FileController {
      @Autowired
      private IFileService fileService;
      private static final Logger LOG = LoggerFactory.getLogger(FileController.class);
      @Value("${file.path}")
      private String FILE_PATH;
  
      @Value("${file.domain}")
      private String FILE_DOMAIN;
  
      @PostMapping("upload1")
      public String upload1(
              @RequestParam MultipartFile shard,
              Integer shardIndex,
              Integer shardSize,
              Integer shardTotal,
              String name,
              String suffix,
              Integer size,
              String key
      ) throws IOException {
          this.LOG.info("开始上传文件");
          System.out.println("当前分片:" + shardIndex);
          System.out.println("当前分片大小:" + shardSize);
          System.out.println("当前分片总数:" + shardTotal);
          System.out.println("文件名称:" + name);
          System.out.println("文件后缀名:" + suffix);
          System.out.println("文件大小:" + size);
          System.out.println("文件唯一的key:" + key);
          // 文件保存到本地目录下
          String localPath = this.FILE_PATH + key + "." + suffix + "." + shardIndex;
          File dest = new File(localPath);
          shard.transferTo(dest);
          LOG.info(dest.getAbsolutePath());
          // 合并文件操作
          if (Objects.equals(shardIndex, shardTotal)) {
              this.merge(key, suffix, shardTotal);
          }
  
          // 数据入库操作
          LambdaQueryWrapper<FileEntity> queryWrapper = new LambdaQueryWrapper<>();
          queryWrapper.eq(FileEntity::getFileKey, key);
          FileEntity fileEntity = new FileEntity();
          if (this.fileService.getOne(queryWrapper) != null) {
              // 说明不是第一次上传,需要更新当前上传的分片数量
              fileEntity.setShardIndex(shardIndex);
  
              if (this.fileService.update(fileEntity, queryWrapper)) {
                  return "上传成功";
              } else {
                  return "上传失败";
              }
          } else {
              // 第一次上传创建
              String path = this.FILE_PATH + key + "." + suffix;
              fileEntity.setFileKey(key);
              fileEntity.setName(name);
              fileEntity.setPath(path);
              fileEntity.setShardIndex(shardIndex);
              fileEntity.setSuffix(suffix);
              fileEntity.setShardSize(shardSize);
              fileEntity.setShardTotal(shardTotal);
              fileEntity.setSize(size);
              if (this.fileService.save(fileEntity)) {
                  return "上传成功";
              } else {
                  return "上传失败";
              }
          }
      }
  	/**
       * 对上传的文件片段合并操作
       * @param key
       * @param suffix
       * @param shardTotal
       * @throws FileNotFoundException
       */
      private void merge(String key, String suffix, Integer shardTotal) throws FileNotFoundException {
          this.LOG.info("=====开始合并切片操作=====");
          String path = this.FILE_PATH + key + "." + suffix;
          File newFile = new File(path);
          FileOutputStream outputStream = new FileOutputStream(newFile, true);//文件追加写入
          FileInputStream fileInputStream = null;//分片文件
          byte[] byt = new byte[10 * 1024 * 1024];
          int len;
          try {
              for (int i = 0; i < shardTotal; i++) {
                  fileInputStream = new FileInputStream(new File(this.FILE_PATH + key + "." + suffix + "." + (i + 1)));
                  while ((len = fileInputStream.read(byt)) != -1) {
                      outputStream.write(byt, 0, len);
                  }
              }
          } catch (Exception e) {
              this.LOG.error("分片合并异常", e);
          } finally {
              try {
                  if (fileInputStream != null) {
                      fileInputStream.close();
                  }
                  outputStream.close();
                  LOG.info("IO流关闭");
              } catch (Exception e) {
                  LOG.error("IO流关闭", e);
              }
          }
          this.LOG.info("=====结束合并切片操作=====");
      }
  }
  

• 9、当合并后可以对之前的分片进行删除操作，避免占用更的磁盘空间

  private void merge(String key, String suffix, Integer shardTotal) throws FileNotFoundException, InterruptedException {
      // ...
      this.LOG.info("=====结束合并切片操作=====");
      System.gc();
      Thread.sleep(1000);
  
      // 删除分片
      LOG.info("删除分片开始");
      for (int i = 0; i < shardTotal; i++) {
          String filePath = path + "." + (i + 1);
          File file = new File(filePath);
          boolean result = file.delete();
          this.LOG.info("删除{}，{}", filePath, result ? "成功" : "失败");
      }
      LOG.info("删除分片结束");
  }
  

五、前端使用BS64提交数据

• 1、使用bs64提交后端可以直接定义一个字符串接收数据，将接收到的数据转换为图片

• 2、前端将上传的文件转换为bs64

  // 使用BS64上传
    const bs64UploadHandler = () => {
      const file = fileRef.value.raw;
      let fileReader = new FileReader();
      fileReader.onload = function (e) {
        const base64 = e.target.result;
        console.log('base64', base64);
        const suffix = file.name.substring(file.name.lastIndexOf('.') + 1);
        axios
          .post('http://localhost:9002/file/bs64Upload', {
            fileName: md5(`${file.name}_${file.size}_${file.type}`) + '.' + suffix,
            fileBs64: base64,
          })
          .then((res) => {
            console.log(res);
          });
      };
      fileReader.readAsDataURL(file);
    };
  

• 3、后端定义一个方法，将字符串转换为MultipartFile数据类型

  package com.course.file.utils;
  
  
  import org.springframework.web.multipart.MultipartFile;
  import sun.misc.BASE64Decoder;
  
  import java.io.*;
  
  public class Base64ToMultipartFile implements MultipartFile {
  
      private final byte[] imgContent;
      private final String header;
  
      public Base64ToMultipartFile(byte[] imgContent, String header) {
          this.imgContent = imgContent;
          this.header = header.split(";")[0];
      }
  
      @Override
      public String getName() {
          // TODO - implementation depends on your requirements
          return System.currentTimeMillis() + Math.random() + "." + header.split("/")[1];
      }
  
      @Override
      public String getOriginalFilename() {
          // TODO - implementation depends on your requirements
          return System.currentTimeMillis() + (int) Math.random() * 10000 + "." + header.split("/")[1];
      }
  
      @Override
      public String getContentType() {
          // TODO - implementation depends on your requirements
          return header.split(":")[1];
      }
  
      @Override
      public boolean isEmpty() {
          return imgContent == null || imgContent.length == 0;
      }
  
      @Override
      public long getSize() {
          return imgContent.length;
      }
  
      @Override
      public byte[] getBytes() throws IOException {
          return imgContent;
      }
  
      @Override
      public InputStream getInputStream() throws IOException {
          return new ByteArrayInputStream(imgContent);
      }
  
      @Override
      public void transferTo(File dest) throws IOException, IllegalStateException {
          new FileOutputStream(dest).write(imgContent);
      }
  
      public static MultipartFile base64ToMultipart(String base64) {
          try {
              String[] baseStrs = base64.split(",");
  
              BASE64Decoder decoder = new BASE64Decoder();
              byte[] b = new byte[0];
              b = decoder.decodeBuffer(baseStrs[1]);
  
              for(int i = 0; i < b.length; ++i) {
                  if (b[i] < 0) {
                      b[i] += 256;
                  }
              }
  
              return new Base64ToMultipartFile(b, baseStrs[0]);
          } catch (IOException e) {
              e.printStackTrace();
              return null;
          }
      }
  }
  

• 4、直接保存文件,这里就不做分片上传

  @PostMapping("bs64Upload")
  public String bs64Upload(@RequestBody FileDTO req) throws IOException {
      // 1.将上传的bs64转为图片
      String bs64 = req.getFileBs64();
      MultipartFile shard = Base64ToMultipartFile.base64ToMultipart(bs64);
      // 图片保存到本地
      String localPath = this.FILE_PATH + req.getFileName() ;
      File dest = new File(localPath);
      shard.transferTo(dest);
      LOG.info(dest.getAbsolutePath());
      return this.FILE_DOMAIN + req.getFileName();
  }
  

六、断点续传

• 1、断点续传主要原谅，前端在点击上传按钮的时候先调用后端一个接口，判断之前是否有上传过记录，如果有就返回之前上传的分片shardIndex，前端就继续以这个分片来上传,如果没有就返回0表示从0开始上传

• 2、后端定义一个接口根据key来查询数据库是否已经有上传过记录

  @GetMapping("{key}")
  public Integer getShardIndexByKeyApi(@PathVariable String key) {
      LambdaQueryWrapper<FileEntity> queryWrapper = new LambdaQueryWrapper<>();
      queryWrapper.eq(FileEntity::getFileKey, key).select(FileEntity::getShardIndex);
      FileEntity fileEntity = this.fileService.getOne(queryWrapper);
      return fileEntity.getShardIndex();
  }
  

• 3、前端在使用上传前先调用上面的接口

   const submitUpload = () => {
      console.log('开始上传文件', JSON.stringify(fileRef.value));
      const file = fileRef.value.raw;
      const key = md5(`${file.name}_${file.size}_${file.type}`);
      axios.get(`http://localhost:9002/file/${key}`).then((response) => {
        if (response.data > 0) {
          // 历史上传
          updateFile(response.data + 1);
        } else {
          // 首次上传
          updateFile(1);
        }
      });
   };
  

七、秒传功能

• 1、当前端使用MD5加密后提交的名字在数据库已经存在,则直接拼接url返回就可以,不需要再次上传

八、上传到阿里OSS

• 1、配置依赖包

  <!--    阿里云oss存储    -->
  <dependency>
      <groupId>com.aliyun.oss</groupId>
      <artifactId>aliyun-sdk-oss</artifactId>
      <version>3.10.2</version>
  </dependency>
  

• 2、封装方法使用文章来源地址https://www.toymoban.com/news/detail-742964.html

  
  import com.aliyun.oss.OSS;
  import com.aliyun.oss.OSSClientBuilder;
  import com.aliyun.oss.model.ObjectMetadata;
  import com.aliyun.oss.model.PutObjectResult;
  import org.springframework.beans.factory.annotation.Value;
  import org.springframework.stereotype.Component;
  import org.springframework.web.multipart.MultipartFile;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.net.URL;
  import java.util.Date;
  import java.util.List;
  import java.util.UUID;
  
  /**
   * 阿里云上传文件
   */
  @Component
  public class OssUtil {
  
      @Value("${aliyun.oss.endpoint}")
      private String endpoint;
      @Value("${aliyun.oss.accessKeyId}")
      private String accessKeyId;
      @Value("${aliyun.oss.accessKeySecret}")
      private String accessKeySecret;
      @Value("${aliyun.oss.bucketName}")
      private String bucketName;
  
      //文件存储目录(自定义阿里云的)
      private String fileDir = "clouFile/";
  
      /**
       * 单个文件上传
       *
       * @param file
       * @return
       */
      public String uploadFile(MultipartFile file) {
          // 调用封装好的上传文件方法
          String fileUrl = uploadImg2Oss(file);
          // 返回完整的路径
          String str = getFileUrl(fileUrl);
          return str.trim();
      }
  
      /**
       * 单个文件上传(指定文件名需要后缀名)
       *
       * @param file
       * @param fileName
       * @return
       */
      public String uploadFile(MultipartFile file, String fileName) {
          try {
              InputStream inputStream = file.getInputStream();
              this.uploadFile2OSS(inputStream, fileName);
              return fileName;
          } catch (Exception e) {
              return "上传失败";
          }
      }
  
      /**
       * 多个文件的上传，返回路径用,分割
       *
       * @param fileList
       * @return
       */
      public String uploadFile(List<MultipartFile> fileList) {
          String fileUrl = "";
          String str = "";
          String photoUrl = "";
          for (int i = 0; i < fileList.size(); i++) {
              fileUrl = uploadImg2Oss(fileList.get(i));
              str = getFileUrl(fileUrl);
              if (i == 0) {
                  photoUrl = str;
              } else {
                  photoUrl += "," + str;
              }
          }
          return photoUrl.trim();
      }
  
      /**
       * 获取完整的路径名
       *
       * @param fileUrl
       * @return
       */
      private String getFileUrl(String fileUrl) {
          if (fileUrl != null && fileUrl.length() > 0) {
              String[] split = fileUrl.split("/");
              String url = this.getUrl(this.fileDir + split[split.length - 1]);
              return url;
          }
          return null;
      }
  
      /**
       * 获取去掉参数的完整路径
       *
       * @param url
       * @return
       */
      private String getShortUrl(String url) {
          String[] imgUrls = url.split("\\?");
          return imgUrls[0].trim();
      }
  
      /**
       * 获取url地址
       *
       * @param key
       * @return
       */
      private String getUrl(String key) {
          // 设置URL过期时间为20年  3600l* 1000*24*365*20
          Date expiration = new Date(new Date().getTime() + 3600l * 1000 * 24 * 365 * 20);
          // 生成URL
          OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
          URL url = ossClient.generatePresignedUrl(bucketName, key, expiration);
          if (url != null) {
              return getShortUrl(url.toString());
          }
          return null;
      }
  
      private String uploadImg2Oss(MultipartFile file) {
          //1、限制最大文件为20M
          if (file.getSize() > 1024 * 1024 * 20) {
              return "图片太大";
          }
          //2、重命名文件
          String fileName = file.getOriginalFilename();
          String suffix = fileName.substring(fileName.lastIndexOf(".")).toLowerCase(); //文件后缀
          String uuid = UUID.randomUUID().toString();
          String name = uuid + suffix;
  
          try {
              InputStream inputStream = file.getInputStream();
              this.uploadFile2OSS(inputStream, name);
              return name;
          } catch (Exception e) {
              return "上传失败";
          }
      }
  
      /**
       * 使用阿里云上传文件
       *
       * @param inStream 输入流
       * @param fileName 文件名称
       * @return
       */
      private String uploadFile2OSS(InputStream inStream, String fileName) {
          String ret = "";
          try {
              //创建上传Object的Metadata
              ObjectMetadata objectMetadata = new ObjectMetadata();
              objectMetadata.setContentLength(inStream.available());
              objectMetadata.setCacheControl("no-cache");
              objectMetadata.setHeader("Pragma", "no-cache");
              objectMetadata.setContentType(getContentType(fileName.substring(fileName.lastIndexOf("."))));
              objectMetadata.setContentDisposition("inline;filename=" + fileName);
              //上传文件
              OSS ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
              PutObjectResult putResult = ossClient.putObject(bucketName, fileDir + fileName, inStream, objectMetadata);
              ret = putResult.getETag();
          } catch (IOException e) {
              System.out.println(e.getMessage());
          } finally {
              try {
                  if (inStream != null) {
                      inStream.close();
                  }
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
          return ret;
      }
  
      /**
       * 获取文件类型
       *
       * @param FilenameExtension
       * @return
       */
      private static String getContentType(String FilenameExtension) {
          if (FilenameExtension.equalsIgnoreCase(".bmp")) {
              return "image/bmp";
          }
          if (FilenameExtension.equalsIgnoreCase(".gif")) {
              return "image/gif";
          }
          if (FilenameExtension.equalsIgnoreCase(".jpeg") ||
                  FilenameExtension.equalsIgnoreCase(".jpg") ||
                  FilenameExtension.equalsIgnoreCase(".png")) {
              return "image/jpeg";
          }
          if (FilenameExtension.equalsIgnoreCase(".html")) {
              return "text/html";
          }
          if (FilenameExtension.equalsIgnoreCase(".txt")) {
              return "text/plain";
          }
          if (FilenameExtension.equalsIgnoreCase(".vsd")) {
              return "application/vnd.visio";
          }
          if (FilenameExtension.equalsIgnoreCase(".pptx") ||
                  FilenameExtension.equalsIgnoreCase(".ppt")) {
              return "application/vnd.ms-powerpoint";
          }
          if (FilenameExtension.equalsIgnoreCase(".docx") ||
                  FilenameExtension.equalsIgnoreCase(".doc")) {
              return "application/msword";
          }
          if (FilenameExtension.equalsIgnoreCase(".xml")) {
              return "text/xml";
          }
          //PDF
          if (FilenameExtension.equalsIgnoreCase(".pdf")) {
              return "application/pdf";
          }
          return "image/jpeg";
      }
  }
  

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