MultipartFile的用法

MultipartFile是Spring框架中的一个接口，用于处理HTTP请求中的文件上传。以下是MultipartFile的用法示例：

1. 单文件上传

@PostMapping("/upload")
public String upload(@RequestParam("file") MultipartFile file) {
    if (file.isEmpty()) {
        return "上传失败，请选择文件";
    }
    String fileName = file.getOriginalFilename();
    String filePath = "D:/upload/";
    File dest = new File(filePath + fileName);
    try {
        file.transferTo(dest);
        return "上传成功";
    } catch (IOException e) {
        return "上传失败！";
    }
}

2. 多文件上传

@PostMapping("/batch/upload")
public String handleFileUpload(@RequestParam("file") MultipartFile[] files) {
    StringBuilder sb = new StringBuilder();
    for (MultipartFile file : files) {
        if (file.isEmpty()) {
            continue;
        }
        String fileName = file.getOriginalFilename();
        String filePath = "D:/upload/";
        File dest = new File(filePath + fileName);
        try {
            file.transferTo(dest);
            sb.append(fileName).append("上传成功；");
        } catch (IOException e) {
            sb.append(fileName).append("上传失败；");
        }
    }
    return sb.toString();
}