用vue和spring下载excel文件

<template>
  <div>
    <button @click="downloadExcel">下载Excel</button>
  </div>
</template>

<script>
export default {
  methods: {
    downloadExcel() {
      // 发送下载请求
      window.location.href = '/api/downloadExcel';
    }
  }
}
</script>

@RestController
@RequestMapping("/api")
public class ExcelController {

    @GetMapping("/downloadExcel")
    public ResponseEntity<Resource> downloadExcel() {
        // 生成Excel文件
        File excelFile = generateExcel();
        
        // 构建文件资源
        Resource resource = new FileSystemResource(excelFile);
        
        // 设置响应头
        HttpHeaders headers = new HttpHeaders();
        headers.add(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=example.xlsx");
        
        // 返回Excel文件流
        return ResponseEntity.ok()
                .headers(headers)
                .contentType(MediaType.APPLICATION_OCTET_STREAM)
                .body(resource);
    }
    
    private File generateExcel() {
        // 生成Excel文件的逻辑
        
        return excelFile;
    }
}