![\"\u5f31\u7f51\u4e0e\u7f51\u7edc\u5207\u6362\u5c01\u9762\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260916004836-6aa9e764d7eb5.jpg\")
<\/p>\n\n
<\/p>\n
\u4e0a\u4e00\u7bc7\u628a\u540e\u53f0\u4e0b\u8f7d\u8dd1\u8d77\u6765\u4e86，Wi-Fi \u73af\u5883\u4e0b\u4e00\u5207\u6b63\u5e38\u3002\u7ed3\u679c\u4e00\u653e\u5230\u771f\u5b9e\u624b\u673a\u4e0a\u6d4b，\u95ee\u9898\u5c31\u5168\u6765\u4e86\u2014\u2014\u7528\u6237\u5728\u5730\u94c1\u91cc\u4e0b\u8f7d，\u4fe1\u53f7\u5ffd\u5f3a\u5ffd\u5f31；\u51fa\u95e8\u7684\u65f6\u5019 Wi-Fi \u65ad\u4e86\u5207\u5230 4G；\u7f51\u7edc\u6296\u4e00\u4e0b\u4efb\u52a1\u5c31\u5931\u8d25\u4e86，\u7528\u6237\u8fd8\u5f97\u624b\u52a8\u70b9\u91cd\u8bd5\u3002<\/p>\n
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\u6700\u5f00\u59cb\u6211\u4ee5\u4e3a RequestAgent \u4f1a\u81ea\u52a8\u5904\u7406\u65ad\u7f51\u91cd\u8fde\u3002Wi-Fi \u73af\u5883\u4e0b\u786e\u5b9e\u662f\u8fd9\u6837，\u5076\u5c14\u65ad\u4e2a\u51e0\u767e\u6beb\u79d2，\u7cfb\u7edf\u81ea\u5df1\u5c31\u6062\u590d\u4e86，\u7528\u6237\u6839\u672c\u611f\u89c9\u4e0d\u5230\u3002<\/p>\n
\u771f\u5230\u4e86\u5f31\u7f51\u73af\u5883\u5c31\u4e0d\u662f\u90a3\u4e48\u56de\u4e8b\u4e86\u3002\u5730\u94c1\u91cc\u4fe1\u53f7\u4e0d\u7a33，TCP \u8fde\u63a5\u76f4\u63a5\u88ab\u6390\u65ad，\u4efb\u52a1\u72b6\u6001\u53d8\u6210 FAILED\u3002\u8fd9\u65f6\u5019\u7528\u6237\u600e\u4e48\u529e？\u603b\u4e0d\u80fd\u8ba9\u7528\u6237\u81ea\u5df1\u70b9\u91cd\u8bd5\u5427？<\/p>\n
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\u8fd9\u91cc\u6709\u4e2a\u5751：\u7f51\u7edc\u65ad\u5f00\u7684\u65f6\u5019，\u7cfb\u7edf\u4e0d\u4e00\u5b9a\u4f1a\u9a6c\u4e0a\u628a\u4efb\u52a1\u6807\u8bb0\u4e3a\u5931\u8d25\u3002\u6709\u65f6\u5019\u4efb\u52a1\u5361\u5728 RUNNING \u72b6\u6001，\u4f46\u5176\u5b9e\u5df2\u7ecf\u4e0b\u4e0d\u52a8\u4e86\u3002\u8fd9\u79cd"\u5047\u6d3b"\u72b6\u6001\u6700\u9ebb\u70e6\u2014\u2014\u4f60\u4ee5\u4e3a\u5b83\u5728\u8dd1，\u5176\u5b9e\u65e9\u5c31\u6b7b\u4e86\u3002<\/p>\n
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\u771f\u6d4b\u4e86\u624d\u53d1\u73b0\u95ee\u9898：Wi-Fi \u5207\u79fb\u52a8\u7f51\u7edc\u7684\u65f6\u5019，IP \u53d8\u4e86，\u539f\u6765\u7684 TCP \u8fde\u63a5\u80af\u5b9a\u65ad\u3002\u4f46 RequestAgent \u4f1a\u4e0d\u4f1a\u81ea\u52a8\u7528\u65b0\u7f51\u7edc\u91cd\u65b0\u8fde\u63a5？<\/p>\n
\u7b54\u6848\u662f：\u4e0d\u4e00\u5b9a\u3002\u53d6\u51b3\u4e8e\u4efb\u52a1\u914d\u7f6e\u3002<\/p>\n
\u5982\u679c\u4f60\u521b\u5efa\u4efb\u52a1\u7684\u65f6\u5019 network \u53c2\u6570\u53ea\u914d\u4e86 NETWORK_WIFI，\u90a3\u5207\u5230\u79fb\u52a8\u7f51\u7edc\u7684\u65f6\u5019，\u4efb\u52a1\u76f4\u63a5\u6682\u505c，\u4e0d\u4f1a\u81ea\u52a8\u7528\u79fb\u52a8\u6570\u636e\u4e0b\u3002\u8fd9\u4e2a\u8bbe\u8ba1\u5176\u5b9e\u633a\u5408\u7406\u7684\u2014\u2014\u7528\u6237\u6ca1\u5f00\u6d41\u91cf\u7684\u8bdd，\u5077\u5077\u7528\u6d41\u91cf\u4e0b\u5927\u6587\u4ef6，\u7528\u6237\u5f97\u6295\u8bc9\u6b7b\u3002<\/p>\n
\u4f46\u5982\u679c\u4f60\u5e0c\u671b\u7528\u6237\u5207\u5230\u79fb\u52a8\u7f51\u7edc\u4e5f\u80fd\u7ee7\u7eed\u4e0b，\u90a3 network \u53c2\u6570\u5c31\u8981\u628a NETWORK_MOBILE \u4e5f\u52a0\u4e0a\u3002\u540c\u65f6\u8fd8\u8981\u5728 UI \u4e0a\u63d0\u793a\u7528\u6237"\u6b63\u5728\u4f7f\u7528\u79fb\u52a8\u6570\u636e\u4e0b\u8f7d"，\u8ba9\u7528\u6237\u77e5\u60c5\u3002<\/p>\n
\u8fd9\u91cc\u6709\u4e2a\u8bbe\u8ba1\u5224\u65ad：\u5230\u5e95\u8981\u4e0d\u8981\u5141\u8bb8\u79fb\u52a8\u6570\u636e\u4e0b\u8f7d？\u6211\u4eec\u7684\u505a\u6cd5\u662f：\u9ed8\u8ba4\u53ea\u5728 Wi-Fi \u4e0b\u4e0b，\u7528\u6237\u53ef\u4ee5\u624b\u52a8\u5f00"\u5141\u8bb8\u79fb\u52a8\u6570\u636e\u4e0b\u8f7d"\u7684\u5f00\u5173\u3002\u7528\u6237\u4e3b\u52a8\u5f00\u4e86\u624d\u5207\u7f51\u7edc\u7ee7\u7eed\u4e0b，\u4e0d\u7136\u5207\u7f51\u5c31\u6682\u505c\u3002\u8fd9\u4e2a\u5ea6\u8981\u628a\u63e1\u597d\u2014\u2014\u65e2\u4e0d\u80fd\u5077\u5077\u8017\u7528\u6237\u6d41\u91cf，\u4e5f\u4e0d\u80fd\u5207\u4e2a\u7f51\u4efb\u52a1\u5c31\u6b7b\u4e86\u3002<\/p>\n
\n
![\"\u5931\u8d25\u91cd\u8bd5\u6d41\u7a0b\u56fe\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260916004837-6aa9e765c34ae.jpg\")
<\/p>\n
\u4e0a\u4e00\u7bc7\u63d0\u4e86 retry \u914d\u7f6e，\u5931\u8d25\u81ea\u52a8\u91cd\u8bd5 3 \u6b21\u3002\u4f46\u8fd9\u91cc\u6709\u4e2a\u95ee\u9898：\u91cd\u8bd5\u662f\u7cfb\u7edf\u81ea\u52a8\u505a\u7684，\u6211\u4eec\u600e\u4e48\u77e5\u9053\u91cd\u8bd5\u4e86\u51e0\u6b21？\u4ec0\u4e48\u65f6\u5019\u7b97\u5f7b\u5e95\u5931\u8d25\u4e86？<\/p>\n
\u521a\u5f00\u59cb\u6211\u4e5f\u60f3\u76f4\u63a5\u9760\u7cfb\u7edf\u91cd\u8bd5\u5c31\u884c，\u4e0d\u7528\u81ea\u5df1\u7ba1\u3002\u5b9e\u9645\u8dd1\u8d77\u6765\u53d1\u73b0，\u7cfb\u7edf\u91cd\u8bd5\u662f"\u95f7\u5934\u8bd5"，\u8bd5\u5b8c\u4e86\u4e0d\u7ba1\u6210\u529f\u5931\u8d25，\u4e5f\u4e0d\u544a\u8bc9\u4f60\u8bd5\u4e86\u51e0\u6b21\u3002\u7528\u6237\u770b\u5230\u7684\u5c31\u662f\u8fdb\u5ea6\u5361\u5728\u90a3，\u4e0d\u77e5\u9053\u662f\u5728\u91cd\u8bd5\u8fd8\u662f\u5df2\u7ecf\u6b7b\u4e86\u3002<\/p>\n
\u6240\u4ee5\u6211\u4eec\u5728\u5e94\u7528\u5c42\u4e5f\u52a0\u4e86\u4e00\u5c42\u5931\u8d25\u5904\u7406\u3002\u4efb\u52a1\u72b6\u6001\u53d8\u6210 FAILED \u7684\u65f6\u5019，\u5148\u522b\u6025\u7740\u63d0\u793a\u7528\u6237，\u7b49\u51e0\u79d2\u770b\u770b\u4f1a\u4e0d\u4f1a\u81ea\u52a8\u6062\u590d\u3002\u5982\u679c\u8fde\u7eed\u51e0\u6b21\u67e5\u8be2\u90fd\u662f FAILED，\u518d\u5f39\u63d0\u793a\u3002<\/p>\n
\u4ee3\u7801\u653e\u5728 entry\/src\/main\/ets\/download\/DownloadRecovery.ets，\u8d1f\u8d23\u4efb\u52a1\u72b6\u6001\u6062\u590d\u548c\u91cd\u8bd5\u3002<\/p>\n
import { request } from '@kit.BasicServicesKit';<\/p>\n
export class DownloadRecovery {
\n private static retryMap: Map<string, number> = new Map();<\/p>\n
\/\/ \u76d1\u542c\u4efb\u52a1\u72b6\u6001\u53d8\u5316，\u5904\u7406\u5931\u8d25\u91cd\u8bd5
\n static async onTaskStateChanged(
\n taskId: string,
\n state: request.DownloadState
\n ): Promise<void> {<\/p>\n
switch (state) {
\n case request.DownloadState.DOWNLOAD_STATE_RUNNING:
\n \/\/ \u4e0b\u8f7d\u4e2d，\u91cd\u7f6e\u91cd\u8bd5\u8ba1\u6570
\n this.retryMap.set(taskId, 0);
\n break;<\/p>\n
case request.DownloadState.DOWNLOAD_STATE_FAILED:
\n \/\/ \u5931\u8d25\u4e86，\u68c0\u67e5\u8981\u4e0d\u8981\u81ea\u52a8\u91cd\u8bd5
\n await this.tryAutoRetry(taskId);
\n break;<\/p>\n
case request.DownloadState.DOWNLOAD_STATE_COMPLETED:
\n \/\/ \u4e0b\u5b8c\u4e86，\u6e05\u7406\u91cd\u8bd5\u8ba1\u6570
\n this.retryMap.delete(taskId);
\n break;
\n }
\n }<\/p>\n
\/\/ \u81ea\u52a8\u91cd\u8bd5\u903b\u8f91
\n private static async tryAutoRetry(
\n taskId: string
\n ): Promise<void> {<\/p>\n
const retryCount = this.retryMap.get(taskId) || 0;<\/p>\n
\/\/ \u6700\u591a\u81ea\u52a8\u91cd\u8bd5 3 \u6b21
\n if (retryCount >= 3) {
\n console.warn('Max retries reached for task: ' + taskId);
\n \/\/ \u63d0\u793a\u7528\u6237\u624b\u52a8\u91cd\u8bd5
\n this.notifyUser(taskId, '\u4e0b\u8f7d\u5931\u8d25，\u8bf7\u624b\u52a8\u91cd\u8bd5');
\n return;
\n }<\/p>\n
\/\/ \u7b49 3 \u79d2\u518d\u91cd\u8bd5，\u7ed9\u7f51\u7edc\u6062\u590d\u65f6\u95f4
\n setTimeout(async () => {
\n try {
\n const task = await this.getTask(taskId);
\n if (task) {
\n await task.start();
\n this.retryMap.set(taskId, retryCount + 1);
\n console.info('Auto retry attempt: ' + (retryCount + 1));
\n }
\n } catch (e) {
\n console.error('Retry failed: ' + e.message);
\n }
\n }, 3000);
\n }<\/p>\n
\/\/ \u91cd\u590d\u4efb\u52a1\u9632\u62a4：\u68c0\u67e5\u662f\u5426\u5df2\u6709\u76f8\u540c\u4efb\u52a1
\n static async checkDuplicateTask(
\n url: string,
\n savePath: string
\n ): Promise<boolean> {<\/p>\n
\/\/ \u67e5\u8be2\u6240\u6709\u4efb\u52a1，\u770b\u770b\u6709\u6ca1\u6709\u76f8\u540c URL \u548c\u8def\u5f84\u7684
\n const tasks = await request.getRequestAgent('download_agent')
\n .then(agent => agent.getTaskList());<\/p>\n
for (const task of tasks) {
\n const info = await task.getTaskInfo();
\n if (info.url === url && info.filePath === savePath) {
\n \/\/ \u5df2\u7ecf\u5728\u4e0b\u8f7d\u4e86，\u4e0d\u8981\u91cd\u590d\u521b\u5efa
\n console.info('Duplicate task found: ' + task.taskId);
\n return true;
\n }
\n }<\/p>\n
return false;
\n }
\n}<\/p>\n
\u8fd9\u6bb5\u4ee3\u7801\u7684\u6838\u5fc3：onTaskStateChanged \u76d1\u542c\u72b6\u6001\u53d8\u5316，FAILED \u7684\u65f6\u5019\u81ea\u52a8\u91cd\u8bd5，\u6700\u591a 3 \u6b21\u3002checkDuplicateTask \u9632\u6b62\u7528\u6237\u91cd\u590d\u70b9\u4e0b\u8f7d，\u521b\u5efa\u4e24\u4efd\u4e00\u6837\u7684\u4efb\u52a1\u3002<\/p>\n
\u771f\u6b63\u8fd0\u884c\u7684\u65f6\u5019\u8981\u6ce8\u610f：\u91cd\u8bd5\u4e0d\u8981\u592a\u9891\u7e41\u3002\u7f51\u7edc\u521a\u65ad，\u4f60\u9a6c\u4e0a\u91cd\u8bd5\u80af\u5b9a\u8fd8\u662f\u5931\u8d25\u3002\u7b49\u4e2a 3 \u79d2 5 \u79d2，\u7ed9\u7f51\u7edc\u6062\u590d\u7684\u65f6\u95f4\u3002\u53e6\u5916，\u91cd\u8bd5\u6b21\u6570\u8981\u5b58\u4e0b\u6765，\u4e0d\u80fd\u5e94\u7528\u4e00\u91cd\u542f\u5c31\u6e05\u96f6\u4e86，\u4e0d\u7136\u65e0\u9650\u91cd\u8bd5\u3002<\/p>\n
\n
![\"\u7f51\u7edc\u5207\u6362\u4e0e\u4efb\u52a1\u6062\u590d\u793a\u610f\u56fe\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260916004838-6aa9e7665ffe8.jpg\")
<\/p>\n
\u8fd9\u4e2a\u95ee\u9898\u6700\u5f00\u59cb\u6211\u6ca1\u5f53\u56de\u4e8b\u3002RequestAgent \u7684\u4efb\u52a1\u4e0d\u662f\u7cfb\u7edf\u7ea7\u7684\u5417？\u5e94\u7528\u9000\u4e86\u4efb\u52a1\u8fd8\u5728，\u90a3\u56de\u6765\u7684\u65f6\u5019\u76f4\u63a5\u67e5\u4efb\u52a1\u72b6\u6001\u4e0d\u5c31\u884c\u4e86？<\/p>\n
\u771f\u6d4b\u4e86\u624d\u53d1\u73b0，\u6ca1\u90a3\u4e48\u7b80\u5355\u3002<\/p>\n
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