一文讲清鸿蒙网络开发

一、概述

通过本指南,您可以掌握HarmonyOS Network Kit的核心功能和最佳实践。Network Kit提供了完整的网络通信解决方案,支持HTTP、WebSocket、Socket等多种协议,满足各类应用的网络需求。合理使用这些能力,可以构建高性能、安全可靠的网络应用。

核心能力

功能模块	主要能力	应用场景
HTTP请求	GET/POST/PUT/DELETE等方法、流式传输、证书配置	RESTful API调用、文件上传下载
WebSocket	全双工通信、心跳检测、客户端/服务端	实时聊天、游戏对战、实时数据推送
TCP Socket	面向连接的可靠传输、服务端监听	长连接通信、自定义协议
UDP Socket	无连接的快速传输、组播支持	视频直播、实时语音、局域网发现
TLS Socket	加密传输、双向认证、证书锁定	安全通信、金融支付
LocalSocket	进程间通信、无需网络	同设备进程通信、性能优化

二、HTTP网络请求

2.1 请求流程

sequenceDiagram participant App as 应用 participant HTTP as HttpRequest participant Server as 服务器 App->>HTTP: createHttp() App->>HTTP: on('headersReceive') App->>HTTP: request(url, options) HTTP->>Server: 发送HTTP请求 Server-->>HTTP: 返回响应头 HTTP-->>App: headersReceive回调 Server-->>HTTP: 返回完整响应 HTTP-->>App: 响应数据 App->>HTTP: destroy()

2.2 基础HTTP请求

import { http } from '@kit.NetworkKit';
import { BusinessError } from '@kit.BasicServicesKit';

class HttpManager {
  private static instance: HttpManager;

  private constructor() {}

  public static getInstance(): HttpManager {
    if (!HttpManager.instance) {
      HttpManager.instance = new HttpManager();
    }
    return HttpManager.instance;
  }

  /**
   * 发送HTTP GET请求
   */
  async get<T>(url: string, headers?: Record<string, string>): Promise<T> {
    const httpRequest = http.createHttp();

    try {
      const response = await httpRequest.request(url, {
        method: http.RequestMethod.GET,
        header: headers || { 'Content-Type': 'application/json' },
        expectDataType: http.HttpDataType.STRING,
        connectTimeout: 60000,
        readTimeout: 60000
      });

      if (response.responseCode === 200) {
        return JSON.parse(response.result as string);
      } else {
        throw new Error(`HTTP Error: ${response.responseCode}`);
      }
    } finally {
      httpRequest.destroy();
    }
  }

  /**
   * 发送HTTP POST请求
   */
  async post<T>(url: string, data: Object, headers?: Record<string, string>): Promise<T> {
    const httpRequest = http.createHttp();

    try {
      const response = await httpRequest.request(url, {
        method: http.RequestMethod.POST,
        header: headers || { 'Content-Type': 'application/json' },
        extraData: JSON.stringify(data),
        expectDataType: http.HttpDataType.STRING,
        connectTimeout: 60000,
        readTimeout: 60000
      });

      if (response.responseCode === 200) {
        return JSON.parse(response.result as string);
      } else {
        throw new Error(`HTTP Error: ${response.responseCode}`);
      }
    } finally {
      httpRequest.destroy();
    }
  }

  /**
   * 上传文件(multipart/form-data)
   */
  async uploadFile(url: string, filePath: string, fileName: string): Promise<string> {
    const httpRequest = http.createHttp();

    try {
      const response = await httpRequest.request(url, {
        method: http.RequestMethod.POST,
        header: { 'Content-Type': 'multipart/form-data' },
        multiFormDataList: [
          {
            name: 'file',
            contentType: 'application/octet-stream',
            filePath: filePath,
            remoteFileName: fileName
          }
        ],
        connectTimeout: 60000,
        readTimeout: 300000 // 上传大文件需要更长超时时间
      });

      return response.result as string;
    } finally {
      httpRequest.destroy();
    }
  }
}

2.3 HTTP流式传输

适用于大文件下载场景,支持进度监听:

class HttpStreamDownloader {
  private httpRequest: http.HttpRequest | null = null;
  private receivedData: ArrayBuffer = new ArrayBuffer(0);

  /**
   * 下载文件并监听进度
   */
  async downloadFile(
    url: string,
    onProgress: (received: number, total: number) => void
  ): Promise<ArrayBuffer> {
    this.httpRequest = http.createHttp();
    this.receivedData = new ArrayBuffer(0);

    return new Promise((resolve, reject) => {
      // 订阅数据接收事件
      this.httpRequest!.on('dataReceive', (data: ArrayBuffer) => {
        const newBuffer = new ArrayBuffer(this.receivedData.byteLength + data.byteLength);
        const newView = new Uint8Array(newBuffer);
        newView.set(new Uint8Array(this.receivedData));
        newView.set(new Uint8Array(data), this.receivedData.byteLength);
        this.receivedData = newBuffer;
      });

      // 订阅下载进度事件
      this.httpRequest!.on('dataReceiveProgress', (progress: http.DataReceiveProgressInfo) => {
        onProgress(progress.receiveSize, progress.totalSize);
      });

      // 订阅数据接收完成事件
      this.httpRequest!.on('dataEnd', () => {
        resolve(this.receivedData);
        this.cleanup();
      });

      // 发起流式请求
      this.httpRequest!.requestInStream(url, {
        method: http.RequestMethod.GET,
        readTimeout: 600000 // 大文件需要更长超时
      }).catch((err: BusinessError) => {
        reject(err);
        this.cleanup();
      });
    });
  }

  /**
   * 取消下载
   */
  cancel(): void {
    this.cleanup();
  }

  private cleanup(): void {
    if (this.httpRequest) {
      this.httpRequest.off('dataReceive');
      this.httpRequest.off('dataReceiveProgress');
      this.httpRequest.off('dataEnd');
      this.httpRequest.destroy();
      this.httpRequest = null;
    }
  }
}

三、WebSocket通信

3.1 WebSocket架构

graph TB A[应用层] --> B[WebSocket客户端] A --> C[WebSocket服务端-仅智慧屏] B --> D[createWebSocket] B --> E[connect建立连接] B --> F[send发送消息] B --> G[close关闭连接] C --> H[createWebSocketServer] C --> I[start启动服务] C --> J[监听客户端连接] C --> K[stop停止服务]

3.2 WebSocket客户端

import { webSocket } from '@kit.NetworkKit';
import { BusinessError } from '@kit.BasicServicesKit';

class WebSocketClient {
  private ws: webSocket.WebSocket;
  private reconnectTimer: number | null = null;
  private reconnectAttempts = 0;
  private maxReconnectAttempts = 5;

  constructor(private url: string) {
    this.ws = webSocket.createWebSocket();
    this.setupEventHandlers();
  }

  private setupEventHandlers(): void {
    // 连接打开事件
    this.ws.on('open', (err: BusinessError, value: Object) => {
      if (err) {
        console.error('WebSocket连接失败:', JSON.stringify(err));
        return;
      }
      console.info('WebSocket连接成功');
      this.reconnectAttempts = 0;
    });

    // 接收消息事件
    this.ws.on('message', (err: BusinessError, value: string | ArrayBuffer) => {
      if (err) {
        console.error('接收消息失败:', JSON.stringify(err));
        return;
      }

      if (typeof value === 'string') {
        console.info('收到文本消息:', value);
        this.handleMessage(value);
      } else {
        console.info('收到二进制消息');
        this.handleBinaryMessage(value);
      }
    });

    // 连接关闭事件
    this.ws.on('close', (err: BusinessError, value: webSocket.CloseResult) => {
      console.info(`WebSocket关闭 code=${value.code} reason=${value.reason}`);
      this.attemptReconnect();
    });

    // 错误事件
    this.ws.on('error', (err: BusinessError) => {
      console.error('WebSocket错误:', JSON.stringify(err));
    });
  }

  /**
   * 连接到WebSocket服务器
   */
  connect(): Promise<void> {
    return new Promise((resolve, reject) => {
      this.ws.connect(this.url, (err: BusinessError, value: boolean) => {
        if (err) {
          reject(err);
        } else {
          resolve();
        }
      });
    });
  }

  /**
   * 发送文本消息
   */
  sendText(message: string): Promise<void> {
    return new Promise((resolve, reject) => {
      this.ws.send(message, (err: BusinessError, value: boolean) => {
        if (err) {
          reject(err);
        } else {
          resolve();
        }
      });
    });
  }

  /**
   * 发送二进制消息
   */
  sendBinary(data: ArrayBuffer): Promise<void> {
    return new Promise((resolve, reject) => {
      this.ws.send(data, (err: BusinessError, value: boolean) => {
        if (err) {
          reject(err);
        } else {
          resolve();
        }
      });
    });
  }

  /**
   * 关闭连接
   */
  close(): Promise<void> {
    if (this.reconnectTimer !== null) {
      clearTimeout(this.reconnectTimer);
      this.reconnectTimer = null;
    }

    return new Promise((resolve, reject) => {
      this.ws.close((err: BusinessError, value: boolean) => {
        if (err) {
          reject(err);
        } else {
          resolve();
        }
      });
    });
  }

  /**
   * 自动重连
   */
  private attemptReconnect(): void {
    if (this.reconnectAttempts >= this.maxReconnectAttempts) {
      console.error('达到最大重连次数,停止重连');
      return;
    }

    const delay = Math.min(1000 * Math.pow(2, this.reconnectAttempts), 30000);
    this.reconnectAttempts++;

    console.info(`${delay}ms后尝试第${this.reconnectAttempts}次重连`);
    this.reconnectTimer = setTimeout(() => {
      this.connect().catch(err => {
        console.error('重连失败:', err);
      });
    }, delay);
  }

  private handleMessage(message: string): void {
    // 业务逻辑处理
  }

  private handleBinaryMessage(data: ArrayBuffer): void {
    // 二进制数据处理
  }
}

四、Socket通信

4.1 TCP Socket客户端

import { socket } from '@kit.NetworkKit';
import { BusinessError } from '@kit.BasicServicesKit';

class TCPSocketClient {
  private tcp: socket.TCPSocket;
  private connected = false;

  constructor() {
    this.tcp = socket.constructTCPSocketInstance();
    this.setupEventHandlers();
  }

  private setupEventHandlers(): void {
    // 连接建立事件
    this.tcp.on('connect', () => {
      console.info('TCP连接已建立');
      this.connected = true;
    });

    // 接收消息事件
    this.tcp.on('message', (value: socket.SocketMessageInfo) => {
      const buffer = value.message;
      const dataView = new DataView(buffer);
      let str = '';
      for (let i = 0; i < dataView.byteLength; i++) {
        str += String.fromCharCode(dataView.getUint8(i));
      }
      console.info('收到消息:', str);
    });

    // 连接关闭事件
    this.tcp.on('close', () => {
      console.info('TCP连接已关闭');
      this.connected = false;
    });
  }

  /**
   * 连接到服务器
   */
  async connect(host: string, port: number): Promise<void> {
    // 绑定本地地址(可选,端口由系统分配)
    const localAddr: socket.NetAddress = {
      address: '0.0.0.0',
      port: 0
    };

    await new Promise<void>((resolve, reject) => {
      this.tcp.bind(localAddr, (err: BusinessError) => {
        if (err) {
          reject(err);
        } else {
          resolve();
        }
      });
    });

    // 连接到服务器
    const remoteAddr: socket.NetAddress = {
      address: host,
      port: port
    };

    const connectOptions: socket.TCPConnectOptions = {
      address: remoteAddr,
      timeout: 6000
    };

    await this.tcp.connect(connectOptions);
  }

  /**
   * 发送数据
   */
  async send(data: string): Promise<void> {
    if (!this.connected) {
      throw new Error('TCP未连接');
    }

    const sendOptions: socket.TCPSendOptions = {
      data: data
    };

    await this.tcp.send(sendOptions);
  }

  /**
   * 关闭连接
   */
  async close(): Promise<void> {
    await this.tcp.close();
    this.tcp.off('message');
    this.tcp.off('connect');
    this.tcp.off('close');
  }
}

4.2 TCP Socket服务端

class TCPSocketServer {
  private server: socket.TCPSocketServer;
  private clients: socket.TCPSocketConnection[] = [];

  constructor() {
    this.server = socket.constructTCPSocketServerInstance();
    this.setupEventHandlers();
  }

  private setupEventHandlers(): void {
    // 客户端连接事件
    this.server.on('connect', (client: socket.TCPSocketConnection) => {
      console.info('新客户端连接');
      this.clients.push(client);

      // 监听客户端消息
      client.on('message', (value: socket.SocketMessageInfo) => {
        const buffer = value.message;
        const dataView = new DataView(buffer);
        let message = '';
        for (let i = 0; i < dataView.byteLength; i++) {
          message += String.fromCharCode(dataView.getUint8(i));
        }
        console.info('收到客户端消息:', message);

        // 广播给所有客户端
        this.broadcast(message, client);
      });

      // 客户端关闭事件
      client.on('close', () => {
        const index = this.clients.indexOf(client);
        if (index > -1) {
          this.clients.splice(index, 1);
        }
        console.info('客户端断开,当前连接数:', this.clients.length);
      });
    });
  }

  /**
   * 启动服务器
   */
  async listen(port: number): Promise<void> {
    const address: socket.NetAddress = {
      address: '0.0.0.0',
      port: port
    };

    await this.server.listen(address);
    console.info(`TCP服务器监听端口: ${port}`);
  }

  /**
   * 广播消息给所有客户端
   */
  private async broadcast(message: string, sender?: socket.TCPSocketConnection): Promise<void> {
    const sendOptions: socket.TCPSendOptions = {
      data: message
    };

    for (const client of this.clients) {
      if (client !== sender) {
        try {
          await client.send(sendOptions);
        } catch (err) {
          console.error('发送失败:', err);
        }
      }
    }
  }

  /**
   * 停止服务器
   */
  stop(): void {
    // 关闭所有客户端连接
    for (const client of this.clients) {
      client.close();
    }
    this.clients = [];
    this.server.off('connect');
  }
}

4.3 TLS Socket加密通信

class TLSSocketClient {
  private tls: socket.TLSSocket;

  constructor() {
    this.tls = socket.constructTLSSocketInstance();
    this.setupEventHandlers();
  }

  private setupEventHandlers(): void {
    this.tls.on('connect', () => {
      console.info('TLS连接建立');
    });

    this.tls.on('message', (value: socket.SocketMessageInfo) => {
      // 处理加密消息
    });

    this.tls.on('close', () => {
      console.info('TLS连接关闭');
    });
  }

  /**
   * 单向认证连接(仅验证服务器证书)
   */
  async connectOneWay(host: string, port: number, caPath: string): Promise<void> {
    const localAddr: socket.NetAddress = {
      address: '0.0.0.0',
      port: 0
    };

    await new Promise<void>((resolve, reject) => {
      this.tls.bind(localAddr, (err: BusinessError) => {
        if (err) reject(err);
        else resolve();
      });
    });

    const remoteAddr: socket.NetAddress = {
      address: host,
      port: port
    };

    const secureOptions: socket.TLSSecureOptions = {
      ca: [caPath], // CA证书路径
      cipherSuite: 'AES256-SHA256'
    };

    const connectOptions: socket.TLSConnectOptions = {
      address: remoteAddr,
      secureOptions: secureOptions
    };

    await this.tls.connect(connectOptions);
  }

  /**
   * 双向认证连接(同时验证客户端和服务器证书)
   */
  async connectTwoWay(
    host: string,
    port: number,
    caPath: string,
    certPath: string,
    keyPath: string,
    password: string
  ): Promise<void> {
    const localAddr: socket.NetAddress = {
      address: '0.0.0.0',
      port: 0
    };

    await new Promise<void>((resolve, reject) => {
      this.tls.bind(localAddr, (err: BusinessError) => {
        if (err) reject(err);
        else resolve();
      });
    });

    const remoteAddr: socket.NetAddress = {
      address: host,
      port: port
    };

    const secureOptions: socket.TLSSecureOptions = {
      ca: [caPath],
      cert: certPath, // 客户端证书
      key: keyPath,   // 客户端私钥
      password: password, // 私钥密码
      protocols: [socket.Protocol.TLSv12],
      cipherSuite: 'AES256-SHA256'
    };

    const connectOptions: socket.TLSConnectOptions = {
      address: remoteAddr,
      secureOptions: secureOptions
    };

    await this.tls.connect(connectOptions);
  }

  /**
   * 发送加密数据
   */
  async send(data: string): Promise<void> {
    await this.tls.send(data);
  }

  /**
   * 关闭连接
   */
  async close(): Promise<void> {
    await this.tls.close();
    this.tls.off('message');
    this.tls.off('connect');
    this.tls.off('close');
  }
}

五、完整示例:网络管理器应用

创建一个统一的网络管理器,整合所有网络能力:

import { http } from '@kit.NetworkKit';
import { webSocket } from '@kit.NetworkKit';
import { socket } from '@kit.NetworkKit';
import { BusinessError } from '@kit.BasicServicesKit';

/**
 * 网络管理器单例
 */
class NetworkManager {
  private static instance: NetworkManager;
  private wsClient: WebSocketClient | null = null;
  private tcpClient: TCPSocketClient | null = null;

  private constructor() {}

  public static getInstance(): NetworkManager {
    if (!NetworkManager.instance) {
      NetworkManager.instance = new NetworkManager();
    }
    return NetworkManager.instance;
  }

  /**
   * HTTP GET请求
   */
  async httpGet<T>(url: string): Promise<T> {
    const httpRequest = http.createHttp();

    try {
      const response = await httpRequest.request(url, {
        method: http.RequestMethod.GET,
        header: { 'Content-Type': 'application/json' },
        expectDataType: http.HttpDataType.STRING,
        connectTimeout: 60000,
        readTimeout: 60000
      });

      if (response.responseCode === 200) {
        return JSON.parse(response.result as string);
      } else {
        throw new Error(`HTTP ${response.responseCode}`);
      }
    } finally {
      httpRequest.destroy();
    }
  }

  /**
   * HTTP POST请求
   */
  async httpPost<T>(url: string, data: Object): Promise<T> {
    const httpRequest = http.createHttp();

    try {
      const response = await httpRequest.request(url, {
        method: http.RequestMethod.POST,
        header: { 'Content-Type': 'application/json' },
        extraData: JSON.stringify(data),
        expectDataType: http.HttpDataType.STRING,
        connectTimeout: 60000,
        readTimeout: 60000
      });

      if (response.responseCode === 200) {
        return JSON.parse(response.result as string);
      } else {
        throw new Error(`HTTP ${response.responseCode}`);
      }
    } finally {
      httpRequest.destroy();
    }
  }

  /**
   * 下载文件并显示进度
   */
  async downloadFile(
    url: string,
    onProgress: (received: number, total: number) => void
  ): Promise<ArrayBuffer> {
    const downloader = new HttpStreamDownloader();
    return await downloader.downloadFile(url, onProgress);
  }

  /**
   * 连接WebSocket
   */
  async connectWebSocket(url: string): Promise<WebSocketClient> {
    if (this.wsClient) {
      await this.wsClient.close();
    }

    this.wsClient = new WebSocketClient(url);
    await this.wsClient.connect();
    return this.wsClient;
  }

  /**
   * 获取WebSocket客户端
   */
  getWebSocketClient(): WebSocketClient | null {
    return this.wsClient;
  }

  /**
   * 连接TCP Socket
   */
  async connectTCPSocket(host: string, port: number): Promise<TCPSocketClient> {
    if (this.tcpClient) {
      await this.tcpClient.close();
    }

    this.tcpClient = new TCPSocketClient();
    await this.tcpClient.connect(host, port);
    return this.tcpClient;
  }

  /**
   * 获取TCP Socket客户端
   */
  getTCPSocketClient(): TCPSocketClient | null {
    return this.tcpClient;
  }

  /**
   * 清理所有连接
   */
  async cleanup(): Promise<void> {
    if (this.wsClient) {
      await this.wsClient.close();
      this.wsClient = null;
    }

    if (this.tcpClient) {
      await this.tcpClient.close();
      this.tcpClient = null;
    }
  }
}

export default NetworkManager;

使用示例页面

import { BusinessError } from '@kit.BasicServicesKit';
import NetworkManager from './NetworkManager';

@Entry
@Component
struct NetworkTestPage {
  @State message: string = '网络测试';
  @State httpResult: string = '';
  @State downloadProgress: string = '0%';
  @State wsStatus: string = '未连接';
  @State tcpStatus: string = '未连接';

  private networkManager = NetworkManager.getInstance();

  build() {
    Column({ space: 20 }) {
      Text(this.message)
        .fontSize(24)
        .fontWeight(FontWeight.Bold)

      // HTTP测试区
      Text('HTTP请求测试')
        .fontSize(18)
        .fontWeight(FontWeight.Medium)

      Button('GET请求')
        .onClick(() => this.testHttpGet())

      Button('POST请求')
        .onClick(() => this.testHttpPost())

      Button('下载文件')
        .onClick(() => this.testDownload())

      Text(this.httpResult)
        .fontSize(14)

      Text(`下载进度: ${this.downloadProgress}`)
        .fontSize(14)

      Divider()

      // WebSocket测试区
      Text('WebSocket测试')
        .fontSize(18)
        .fontWeight(FontWeight.Medium)

      Text(`状态: ${this.wsStatus}`)
        .fontSize(14)

      Button('连接WebSocket')
        .onClick(() => this.testWebSocket())

      Button('发送WebSocket消息')
        .onClick(() => this.sendWebSocketMessage())

      Divider()

      // TCP Socket测试区
      Text('TCP Socket测试')
        .fontSize(18)
        .fontWeight(FontWeight.Medium)

      Text(`状态: ${this.tcpStatus}`)
        .fontSize(14)

      Button('连接TCP')
        .onClick(() => this.testTCPSocket())

      Button('发送TCP消息')
        .onClick(() => this.sendTCPMessage())
    }
    .width('100%')
    .height('100%')
    .padding(20)
  }

  /**
   * 测试HTTP GET请求
   */
  async testHttpGet(): Promise<void> {
    try {
      const result = await this.networkManager.httpGet('https://api.example.com/data');
      this.httpResult = JSON.stringify(result);
    } catch (err) {
      this.httpResult = `请求失败: ${err}`;
    }
  }

  /**
   * 测试HTTP POST请求
   */
  async testHttpPost(): Promise<void> {
    try {
      const data = { name: 'test', value: 123 };
      const result = await this.networkManager.httpPost('https://api.example.com/submit', data);
      this.httpResult = JSON.stringify(result);
    } catch (err) {
      this.httpResult = `请求失败: ${err}`;
    }
  }

  /**
   * 测试文件下载
   */
  async testDownload(): Promise<void> {
    try {
      const data = await this.networkManager.downloadFile(
        'https://example.com/file.zip',
        (received, total) => {
          const percent = Math.floor((received / total) * 100);
          this.downloadProgress = `${percent}%`;
        }
      );
      this.httpResult = `下载完成,大小: ${data.byteLength} 字节`;
      this.downloadProgress = '100%';
    } catch (err) {
      this.httpResult = `下载失败: ${err}`;
    }
  }

  /**
   * 测试WebSocket连接
   */
  async testWebSocket(): Promise<void> {
    try {
      await this.networkManager.connectWebSocket('ws://example.com:8080');
      this.wsStatus = '已连接';
    } catch (err) {
      this.wsStatus = `连接失败: ${err}`;
    }
  }

  /**
   * 发送WebSocket消息
   */
  async sendWebSocketMessage(): Promise<void> {
    const client = this.networkManager.getWebSocketClient();
    if (!client) {
      this.wsStatus = '未连接';
      return;
    }

    try {
      await client.sendText('Hello WebSocket!');
      this.wsStatus = '消息已发送';
    } catch (err) {
      this.wsStatus = `发送失败: ${err}`;
    }
  }

  /**
   * 测试TCP Socket连接
   */
  async testTCPSocket(): Promise<void> {
    try {
      await this.networkManager.connectTCPSocket('192.168.1.100', 8888);
      this.tcpStatus = '已连接';
    } catch (err) {
      this.tcpStatus = `连接失败: ${err}`;
    }
  }

  /**
   * 发送TCP消息
   */
  async sendTCPMessage(): Promise<void> {
    const client = this.networkManager.getTCPSocketClient();
    if (!client) {
      this.tcpStatus = '未连接';
      return;
    }

    try {
      await client.send('Hello TCP!');
      this.tcpStatus = '消息已发送';
    } catch (err) {
      this.tcpStatus = `发送失败: ${err}`;
    }
  }

  aboutToDisappear(): void {
    // 页面销毁时清理连接
    this.networkManager.cleanup();
  }
}

六、最佳实践

6.1 网络请求优化

1. 连接复用: HTTP/2和HTTP/3支持连接复用,减少握手开销
2. 超时设置: 根据业务场景合理设置connectTimeout和readTimeout
3. 资源释放: 及时调用destroy()释放HttpRequest对象
4. 缓存策略: 合理使用usingCache参数,减少重复请求

6.2 错误处理

async function robustHttpRequest<T>(url: string, retries: number = 3): Promise<T> {
  let lastError: Error | null = null;

  for (let i = 0; i < retries; i++) {
    try {
      const result = await NetworkManager.getInstance().httpGet<T>(url);
      return result;
    } catch (err) {
      lastError = err as Error;
      console.error(`请求失败,第${i + 1}次重试:`, err);

      // 等待一段时间后重试
      await new Promise(resolve => setTimeout(resolve, 1000 * Math.pow(2, i)));
    }
  }

  throw lastError || new Error('请求失败');
}

6.3 证书安全配置

在src/main/resources/base/profile/network_config.json配置证书锁定:

{
  "network-security-config": {
    "domain-config": [
      {
        "domains": [
          {
            "include-subdomains": true,
            "name": "api.example.com"
          }
        ],
        "pin-set": {
          "expiration": "2025-12-31",
          "pin": [
            {
              "digest-algorithm": "sha256",
              "digest": "base64encodedpinvalue"
            }
          ]
        }
      }
    ]
  }
}

6.4 性能监控

class NetworkPerformanceMonitor {
  static async measureRequestTime(url: string): Promise<number> {
    const startTime = Date.now();

    try {
      await NetworkManager.getInstance().httpGet(url);
      return Date.now() - startTime;
    } catch (err) {
      console.error('请求失败:', err);
      return -1;
    }
  }

  static async checkNetworkQuality(): Promise<string> {
    const testUrl = 'https://www.example.com';
    const responseTime = await this.measureRequestTime(testUrl);

    if (responseTime < 0) return '网络异常';
    if (responseTime < 100) return '网络优秀';
    if (responseTime < 300) return '网络良好';
    if (responseTime < 1000) return '网络一般';
    return '网络较差';
  }
}

七、常见问题

Q1: 应用退到后台后Socket断开怎么办?

A: 应用退后台后Socket可能断开,需要在重回前台时检测并重连:

onPageShow(): void {
  // 检查连接状态
  const client = this.networkManager.getTCPSocketClient();
  if (client && !client.isConnected()) {
    // 重新连接
    this.reconnectSocket();
  }
}

Q2: 如何处理大文件上传?

A: 使用multipart/form-data格式,设置更长的超时时间:

async uploadLargeFile(filePath: string): Promise<void> {
  const httpRequest = http.createHttp();

  await httpRequest.request(url, {
    method: http.RequestMethod.POST,
    header: { 'Content-Type': 'multipart/form-data' },
    multiFormDataList: [{
      name: 'file',
      contentType: 'application/octet-stream',
      filePath: filePath,
      remoteFileName: 'large_file.zip'
    }],
    readTimeout: 600000, // 10分钟
    connectTimeout: 60000
  });
}

Q3: WebSocket如何实现心跳保活?

A: HarmonyOS的WebSocket已内置心跳机制,每30秒自动发送Ping帧,60秒无响应会断开连接。开发者无需额外实现。