1、安装 @ohos/axios

ohpm install @ohos/axios

Tips：按住Ctrl + Alt + Shift + S 可以查看你的 SDK 版本，如果你不是最新版（api 12）的话请降低 axios 的版本，不然会爆下面的错误：

ERROR: Failed :entry:default@MergeProfile…
hvigor ERROR: The compatibleSdkVersion 9 cannot be smaller than version 12 declared in library [:library]
as the library might be using APIS not available in 9
hvigor ERROR: BUILD FAILED in 256 ms

"@ohos/axios": "2.0.0"

2、开始封装

2.1 新建 utils 文件夹 和 api 文件夹

2.2 在 utils 文件夹里新建 http.ts

import axios, { AxiosInstance, AxiosRequestConfig, AxiosResponse, InternalAxiosRequestConfig } from "@ohos/axios";

// axios 请求配置
const config = {
  baseURL:'http://localhost:8080',
  // baseURL: '/api',
  timeout: 1000
}

// 定义返回值类型
interface Result<T = any> {
  code: number;
  message: string;
  data: T;
}

class Http {
  // axios 实例
  private instance: AxiosInstance;
  // 构造函数初始化
  constructor(config: AxiosRequestConfig) {
    this.instance = axios.create(config);
    //定义拦截器
    this.interceptors();
  }

  private interceptors() {
    // axios 发送请求之前的处理
    this.instance.interceptors.request.use((config: InternalAxiosRequestConfig) => {
      // 在请求头部携带token
      // let token = sessionStorage.getItem('token');
      let token = '';
      if (token) {
        config.headers!['token'] = token;
        // 把 token 放到 headers 里面
        // (config.headers as AxiosRequestHeaders).token = token;
      }
      console.log('' + config);
      return config;

    }, (error: any) => {
      error.data = {};
      error.data.msg = '服务器异常，请联系管理员！'
      return error;
    })
    // axios 请求返回之后的处理
    // 请求返回处理
    this.instance.interceptors.response.use((res: AxiosResponse) => {
      // console.log(res.data);
      if (res.data.code != 200) {
        console.log(res.data.msg || '服务器出错啦');
        return Promise.reject(res.data.msg || '服务器出错啦');
      } else {
        return res.data;
      }
    }, (error) => {
      console.log('进入错误！');
      error.data = {};
      if (error && error.response) {
        switch (error.response.status) {
          case 400:
            error.data.msg = "错误请求";
            console.log(error.data.msg);
            break;
          case 401:
            error.data.msg = "未授权，请登录";
            console.log(error.data.msg);
            break;
          case 403:
            error.data.msg = "拒绝访问";
            console.log(error.data.msg);
            break;
          case 404:
            error.data.msg = "请求错误，未找到该资源";
            console.log(error.data.msg);
            break;
          case 405:
            error.data.msg = "请求方法未允许";
            console.log(error.data.msg);
            break;
          case 408:
            error.data.msg = "请求超时";
            console.log(error.data.msg);
            break;
          case 500:
            error.data.msg = "服务器端出错";
            console.log(error.data.msg);
            break;
          case 501:
            error.data.msg = "网络未实现";
            console.log(error.data.msg);
            break;
          case 502:
            error.data.msg = "网络错误";
            console.log(error.data.msg);
            break;
          case 503:
            error.data.msg = "服务不可用";
            console.log(error.data.msg);
            break;
          case 504:
            error.data.msg = "网络超时";
            console.log(error.data.msg);
            break;
          case 505:
            error.data.msg = "http版本不支持该请求";
            console.log(error.data.msg);
            break;
          default:
            error.data.msg = `连接错误${error.response.status}`;
            console.log(error.data.msg);
        }
      } else {
        error.data.msg = "连接到服务器失败";
        console.log(error.data.msg)
      }
      return Promise.reject(error);
    })
  }
  // GET方法
  get<T = Result>(url: string, params?: object): Promise<T> {
    return this.instance.get(url, { params });
  }
  // POST方法
  post<T = Result>(url: string, data?: object): Promise<T> {
    return this.instance.post(url, data);
  }
  // PUT方法
  put<T = Result>(url: string, data?: object): Promise<T> {
    return this.instance.put(url, data);
  }
  // DELETE方法
  delete<T = Result>(url: string): Promise<T> {
    return this.instance.delete(url);
  }
}

export default new Http(config);

2.3 在 api 文件夹里新建 api.ets

// api.ts
import http from '../utils/http';

// 新增
export const testApi = () => {
  return http.get("/admin/term/list")
}

3、页面调用

import { testApi } from './api/api'

// 返回数据具体类型
interface term {
  id: number,
  monthCount: number,
  unit: string

}

// 定义返回值类型
interface Result<T = term> {
  code: number;
  message: string;
  data: Array<T>;
}

@Entry
@Component
struct Test7_19Page {
  @State message: string = 'Hello World'

  build() {
    Row() {
      Column() {
        Text(this.message)
          .fontSize(50)
          .fontWeight(FontWeight.Bold)
        Button() {
          Text('发起请求').fontSize(20)
        }.height(200).width(200)
        .onClick(async () => {
          let res: Result = await testApi();
          console.log(JSON.stringify(res.data[0]));
        })
      }
      .width('100%')
    }
    .height('100%')
  }
}

4、打印结果