通过@ohos.util (util工具函数)实现GBK转换UTF-8格式，实现思路如下：
1. 引入axios和util。
2. 使用axios获取网络数据，并将数据类型设置为ARRAY_BUFFER。
3. 使用util.TextDecoder方法进行解码。
4. 将解码后的数据通过LazyForEach循环显示在列表中。
参考代码如下：
import { util } from '@kit.ArkTS';
import axios, { AxiosResponse } from '@ohos/axios';
const URL: string = 'xxx';
@Entry
@Component
struct FriendsBook {
build() {
}
aboutToAppear() {
axios<string, AxiosResponse<string>, null>({
method: 'get',
url: URL,
// When using the util.TextDecoder method, the encoding and decoding formats must be consistent,
// so the data type needs to be set to ARRAY_BUFFER when retrieving, otherwise garbled characters will appear.
responseType: 'ARRAY_BUFFER'
})
.then((res: AxiosResponse) => {
// First, use create to construct a TextDecoder instance and set the encoding format to gbk.
const textDecoder = util.TextDecoder.create('gbk', { ignoreBOM: true });
// Next, use the decodeWithStream method to decode the input parameters and output the corresponding UTF-8 formatted text string.
// The parameters passed in must be in Uint8Array format, so the obtained data needs to be converted to an array type using the Uint8Array method.
const result = new Uint8Array(res.data);
const resultString = textDecoder.decodeToString(result, { stream: false });
// Parse JSON strings.
const jsonResult = JSON.parse(resultString) as string;
})
}
}