java vue大文件分片上传代码

以下是Java和Vue实现大文件分片上传的示例代码：

Java后端代码：

@RestController
@RequestMapping("/upload")
public class UploadController {

    @PostMapping("/file")
    public Result uploadFile(@RequestParam("file") MultipartFile file,
                             @RequestParam("index") int index,
                             @RequestParam("total") int total) throws IOException {
        // 校验和过滤文件
        if (file.isEmpty() || index < 0 || index >= total) {
            return Result.fail("Invalid request");
        }
        // 保存文件片段到磁盘上
        String fileName = file.getOriginalFilename();
        String filePath = "/path/to/upload/dir/" + fileName;
        File dest = new File(filePath);
        file.transferTo(dest);
        // 判断是否所有文件片段都已上传完成
        if (index == total - 1) {
            // 合并文件片段为完整文件
            String mergedFilePath = "/path/to/upload/dir/" + fileName;
            for (int i = 0; i < total; i++) {
                File part = new File("/path/to/upload/dir/" + fileName + ".part" + i);
                FileOutputStream fos = new FileOutputStream(mergedFilePath, true);
                FileInputStream fis = new FileInputStream(part);
                byte[] buffer = new byte[1024 * 1024];
                int len;
                while ((len = fis.read(buffer)) != -1) {
                    fos.write(buffer, 0, len);
                }
                fis.close();
                fos.close();
                part.delete();
            }
            // 返回上传成功的消息
            return Result.success();
        } else {
            // 返回继续上传的提示
            return Result.info("Continue uploading");
        }
    }
}

Vue前端代码：

<template>
  <div>
    <input type="file" @change="selectFile">
    <button @click="upload">Upload</button>
    <div v-if="progress > 0">{{ progress }}%</div>
  </div>
</template>

<script>
import axios from 'axios';

export default {
  data() {
    return {
      file: null,
      progress: 0,
      uploaded: false
    }
  },
  methods: {
    selectFile(event) {
      this.file = event.target.files[0];
    },
    async upload() {
      if (!this.file) {
        return;
      }
      const fileSize = this.file.size;
      const chunkSize = 1 * 1024 * 1024; // 1MB
      const totalChunks = Math.ceil(fileSize / chunkSize);
      let index = 0;
      let uploadedChunks = [];
      while (index < totalChunks) {
        const start = index * chunkSize;
        const end = Math.min(start + chunkSize, fileSize);
        const chunk = this.file.slice(start, end);
        const formData = new FormData();
        formData.append('file', chunk, this.file.name);
        formData.append('index', index);
        formData.append('total', totalChunks);
        if (uploadedChunks.includes(index)) {
          // 如果该文件片段已经上传过，则直接跳过
          index++;
          continue;
        }
        const response = await axios.post('/upload/file', formData, {
          headers: {
            'Content-Type': 'multipart/form-data'
          },
          onUploadProgress: progressEvent => {
            // 显示上传进度
            this.progress = Math.round((start + progressEvent.loaded) / fileSize * 100);
          }
        });
        if (response.data.code === 0) {
          // 文件上传成功
          uploadedChunks.push(index);
          if (uploadedChunks.length === totalChunks) {
            // 所有文件片段都上传完成
            this.progress = 100;
            this.uploaded = true;
            break;
          }
        } else if (response.data.code === 1) {
          // 需要继续上传下一个文件片段
          // do nothing
        } else {
          // 文件上传失败
          alert('Upload failed');
          break;
        }
        index++;
      }
      if (this.uploaded) {
        // 显示上传成功的消息
        alert('Upload succeeded');
        this.progress = 0;
        this.file = null;
        this.uploaded = false;
      }
    }
  }
}
</script>

这是一个简单的示例代码，实际应用中可能需要根据具体需求进行修改和优化。