electron下载文件，弹窗选择下载路径，并通知下载进度

1：在window.js中 引入session 

import { app, BrowserWindow, ipcMain, dialog, shell, session } from 'electron';

2：发送下载请求

 // 在主进程监听渲染进程发送的 'start-download' 事件ipcMain.on('start-download', async (event, downloadUrl) => {let win = BrowserWindow.getAllWindows()[0];});

3：弹窗选择路径

 // 在主进程监听渲染进程发送的 'start-download' 事件ipcMain.on('start-download', async (event, downloadUrl) => {let win = BrowserWindow.getAllWindows()[0];const savePath = await dialog.showSaveDialog(win[0], {defaultPath: path.basename(downloadUrl), // 使用源文件名作为默认保存文件名});console.log(savePath.canceled, savePath.filePath);});

4：判断下载地址，如果存在就下载，并监听发送进度

 ipcMain.on('start-download', async (event, downloadUrl) => {let win = this.getAllWindows();const savePath = await dialog.showSaveDialog(win[0], {defaultPath: path.basename(downloadUrl), // 使用源文件名作为默认保存文件名});console.log(savePath.canceled, savePath.filePath);if (!savePath.canceled) {const ses = session.fromPartition('persist:my-session');// 先移除之前可能已经注册的监听器ses.removeAllListeners('will-download');ses.on('will-download', (event, item, webContents) => {let win = BrowserWindow.getAllWindows()[0];const fileName = item.getFilename();console.log(`开始下载: ${fileName}`);// const savePath = path.join('C:', 'Users', 'A', 'Downloads', fileName);item.setSavePath(savePath.filePath);win.webContents.send('download-started', { fileName });item.on('updated', (event, state) => {if (state === 'interrupted') {console.log('下载中断...');} else if (state === 'progressing') {if (item.isPaused()) {console.log('下载暂停...');} else {console.log(savePath.filePath,`下载进度: ${((item.getReceivedBytes() / item.getTotalBytes()) * 100).toFixed(2,)}%`,);}}});item.on('done', (event, state) => {if (state === 'completed') {console.log('文件下载完成！');win.webContents.send('download-success', fileName);} else {console.log('下载失败');}});});// 开始下载文件const downloadItem = ses.downloadURL(downloadUrl);}});

5：在preload.js中暴露下载以及通知操作

const { contextBridge, ipcRenderer } = require('electron');
var os = require('os');contextBridge.exposeInMainWorld('electronAPI', {downloadSuccess: (callback) =>ipcRenderer.on('download-success', (e, savePath) => callback(savePath)),downloadFailed: () => ipcRenderer.on('download-failed', (e) => callback(e)),onDownloadStarted: (url) => ipcRenderer.send('start-download', url),
});

6：在渲染进程中使用

//下载项目const downloadProject = () => {// const fileUrl = 'http://192.168.1.999:8/server/core.jar'; // 替换为实际的文件 URL// window.electronAPI.onDownloadStarted(fileUrl);};window.electronAPI.downloadSuccess((res) => {if (res) {console.log('success', '下载成功', `${res}下载成功，可在客户端首页打开。`);}});window.electronAPI.downloadFailed((res) => {if (res) {console.log('error', '下载失败', '当前模型提交终端，请排查问题后重试。');}});

7：文件流下载

 ipcMain.on('start-download', async (event, downloadUrl, fileName, Authorization) => {let win = this.getAllWindows();const savePath = await dialog.showSaveDialog(win[0], {defaultPath: fileName, // 使用源文件名作为默认保存文件名});if (!savePath.canceled && savePath.filePath) {let window = BrowserWindow.getAllWindows()[0];window.webContents.send('download-start', fileName, savePath.filePath);//文件流下载const filePath = savePath.filePath;const response = await axios.get(downloadUrl, {headers: {ContentType: 'application/x-www-form-urlencoded',Authorization,},responseType: 'stream',});const writer = fs.createWriteStream(filePath);response.data.pipe(writer);return new Promise((resolve, reject) => {writer.on('finish', () => {console.log('File downloaded successfully:', fs.existsSync(filePath));window.webContents.send('download-success', fileName, filePath);});writer.on('error', () => {window.webContents.send('download-failed');});});}});