Author：赵志乾
Date：2024-07-04
Declaration：All Right Reserved！！！

1. 添加依赖

        在pom.xml中添加excel文件处理库。

<!-- Apache POI for Excel processing -->  
<dependency>  
    <groupId>org.apache.poi</groupId>  
    <artifactId>poi</artifactId>  
    <version>5.2.3</version>  
</dependency>  
<dependency>  
    <groupId>org.apache.poi</groupId>  
    <artifactId>poi-ooxml</artifactId>  
    <version>5.2.3</version>  
</dependency>

2. 配置上传相关参数

        application.yml中配置文件上传的大小限制。

spring:
  servlet:
    multipart:
      max-file-size: 20MB
      max-request-size: 20MB

3. 创建Controller接收文件并保存到本地

@RestController
@RequestMapping("/api/excel")
public class ExcelUploadController {

    private final String TARGET_FOLDER = "./";

    @PostMapping("/upload")
    public ResponseEntity<String> uploadExcelFile(@RequestParam("file") MultipartFile file, @RequestParam("traceId")String traceId) {
        if (file.isEmpty()) {
            return ResponseEntity.status(400).body("File is empty");
        }

        try {
            // 确保多级目录存在
            String filePathName = TARGET_FOLDER+traceId+"/";
            File filePath = new File(filePathName);
            if(!filePath.exists()){
                boolean result = filePath.mkdirs();
                if(!result){
                    return ResponseEntity.status(500).body("Failed to process Excel file");
                }
            }
            // 文件保存到本地
            String fileName = file.getOriginalFilename();
            Path path = Paths.get(TARGET_FOLDER +traceId+"/"+ fileName).normalize();
            Files.copy(file.getInputStream(), path, StandardCopyOption.REPLACE_EXISTING);

            return ResponseEntity.ok("Excel file uploaded and processed successfully");
        } catch (IOException e) {
            e.printStackTrace();
            return ResponseEntity.status(500).body("Failed to process Excel file");
        }
    }
}