以下是一个使用Angular 2上传大文件的解决方法，包含了代码示例：

1. 首先，需要创建一个服务来处理文件上传。在 Angular 2 中，可以使用 HttpClient 来发送 HTTP 请求。创建一个名为 FileUploadService 的服务：

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

@Injectable()
export class FileUploadService {

  constructor(private http: HttpClient) { }

  upload(file: File) {
    const formData = new FormData();
    formData.append('file', file);

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

    return this.http.post('/api/upload', formData, { headers: headers });
  }
}

2. 在组件中使用 FileUploadService 来处理文件上传。创建一个名为 FileUploadComponent 的组件：

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

@Component({
  selector: 'app-file-upload',
  template: `
    
    Upload
  `
})
export class FileUploadComponent {

  files: File[];

  constructor(private fileUploadService: FileUploadService) { }

  onFileSelected(files: FileList) {
    this.files = Array.from(files);
  }

  upload() {
    this.fileUploadService.upload(this.files[0]).subscribe(
      response => {
        console.log('File uploaded successfully');
      },
      error => {
        console.log('Error uploading file');
      }
    );
  }
}

3. 在你的模块中导入 HttpClientModule 并将 FileUploadService 和 FileUploadComponent 添加到 providers 和 declarations 中：

import { NgModule } from '@angular/core';
import { HttpClientModule } from '@angular/common/http';
import { FileUploadService } from './file-upload.service';
import { FileUploadComponent } from './file-upload.component';

@NgModule({
  imports: [
    HttpClientModule
  ],
  providers: [
    FileUploadService
  ],
  declarations: [
    FileUploadComponent
  ]
})
export class AppModule { }

现在，当用户选择文件并点击上传按钮时，文件将被上传到服务器。请确保在服务器端正确处理文件上传请求。