您可以使用Angular的HttpClient库来发送多部分/form-data的POST请求，以发送两个文件。以下是一个示例代码：

1. 创建一个service来处理HTTP请求：

import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http';

@Injectable({
  providedIn: 'root'
})
export class FileUploadService {

  constructor(private http: HttpClient) { }

  uploadFiles(file1: File, file2: File) {
    const formData: FormData = new FormData();
    formData.append('file1', file1, file1.name);
    formData.append('file2', file2, file2.name);

    const headers = new HttpHeaders();
    headers.append('Content-Type', 'multipart/form-data');
    headers.append('Accept', 'application/json');

    return this.http.post('your-api-url', formData, { headers: headers });
  }
}

2. 在组件中使用上述service来上传文件：

import { Component } from '@angular/core';
import { FileUploadService } from './file-upload.service';

@Component({
  selector: 'app-file-upload',
  templateUrl: './file-upload.component.html',
  styleUrls: ['./file-upload.component.css']
})
export class FileUploadComponent {
  file1: File;
  file2: File;

  constructor(private fileUploadService: FileUploadService) { }

  onFile1Selected(event) {
    this.file1 = event.target.files[0];
  }

  onFile2Selected(event) {
    this.file2 = event.target.files[0];
  }

  uploadFiles() {
    this.fileUploadService.uploadFiles(this.file1, this.file2).subscribe(
      response => {
        console.log('Files uploaded successfully');
      },
      error => {
        console.log('Error uploading files');
      }
    );
  }
}

3. 在组件模板中添加文件选择和上传按钮：

Upload

请确保替换上述代码中的"your-api-url"为您的实际API端点的URL。另外，您可能需要根据您的需求自定义请求头和错误处理。