Electron+Vue使用Nodejs开发爬虫

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Electron+Vue使用Nodejs开发爬虫

添加依赖

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npm install request cheerio async -save

request

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var request = require('request');

// 通过 GET 请求来读取 http://cnodejs.org/ 的内容
request('http://cnodejs.org/', function (error, response, body) {
  if (!error && response.statusCode == 200) {
    // 输出网页内容
    console.log(body);
  }
});

请求跨域的解决方式

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// Create the browser window.
const win = new BrowserWindow({
    width: 1200,
    height: 800,
    webPreferences: {
        webSecurity: false,
        nodeIntegration: process.env.ELECTRON_NODE_INTEGRATION
    }
});

app.commandLine.appendSwitch("disable-features", "OutOfBlinkCors");

主要添加了第6行和第11行，正式运行时删除即可

文件夹路径

主进程

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const { app } = require('electron')
app.getPath(name)

渲染进程

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const { app } = window.require("electron").remote;

String - You can request the following paths by the name:

  • home 用户的 home 文件夹（主目录）

  • appData

    Per-user application data directory, which by default points to:

    • %APPDATA% Windows 中
    • $XDG_CONFIG_HOME or ~/.config Linux 中
    • ~/Library/Application Support macOS 中

  • userData 储存你应用程序设置文件的文件夹，默认是 appData 文件夹附加应用的名称

  • temp 临时文件夹

  • exe当前的可执行文件

  • module The libchromiumcontent 库

  • desktop 当前用户的桌面文件夹

  • documents 用户文档目录的路径

  • downloads 用户下载目录的路径

  • music 用户音乐目录的路径

  • pictures 用户图片目录的路径

  • videos 用户视频目录的路径

  • recent Directory for the user’s recent files (Windows only).

  • logs应用程序的日志文件夹

  • pepperFlashSystemPlugin Pepper Flash 插件的系统版本的完成路径。

  • crashDumps Directory where crash dumps are stored.

Returns String - A path to a special directory or file associated with name. On failure, an Error is thrown.

If app.getPath('logs') is called without called app.setAppLogsPath() being called first, a default log directory will be created equivalent to calling app.setAppLogsPath() without a path parameter.

选择文件夹

添加引用

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const { app, dialog } = window.require("electron").remote;

弹窗选择

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select_dir: function() {
    var that = this;
    dialog
        .showOpenDialog({
        properties: ["openFile", "openDirectory"]
    })
        .then(result => {
        if (!result.canceled) {
            that.outpath = result.filePaths[0];
        }
    })
        .catch(err => {
        console.log(err);
    });
}

文件下载

引用

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const request = require("request");
var fs = window.require("fs");

下载

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var fileurl = "http://www.psvmc.cn/favicon.ico";
let filename = fileurl.split("/").reverse()[0];
let filepath = this.outpath + "\\" + filename;
let stream = fs.createWriteStream(filepath);
request(fileurl)
    .pipe(stream)
    .on("close", function(error) {
    if (!error) {
        console.log("文件[" + filename + "]下载完毕");
    }
});

文件上传

electron写应用时，会遇到自动上传的需求。但是H5中只能通过input（type=file）来手动上传，JS又没有读取文件的权限，此时，我们可以借助node模块完成需求。

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uploadfile: function() {
    var filename = "favicon.ico";
    let filepath = this.outpath + "\\" + filename;
    fs.readFile(filepath, (err, data) => {
        if (!err) {
            let file = new File([data], filename, {
                type: "image/" + filename.split(".").reverse()[0]
            });
            let form = new FormData();
            form.append("file", file);
            form.append("savefolder", "resourcetest");
            form.append("iscover", 0);
            form.append("isrename", 0);
            let request_url = "http://file.psvmc.com/up/upfile";
            let xhr = new XMLHttpRequest();
            xhr.open("post", request_url);
            xhr.send(form);
            xhr.onload = function() {
                console.info(this.responseText);
            };
        }
    });
}

调用接口

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var request = require('request');
var url="请求url";
var loginname = this.$refs["loginname"].value;
var loginpwd = this.$refs["loginpwd"].value;
var requestData = {
    loginname: loginname,
    loginpwd: loginpwd
}
request({
    url: url,
    method: "POST",
    json: true,
    headers: {
        "content-type": "application/json",
    },
    body: requestData
}, function(error, response, body) {
    if (!error && response.statusCode == 200) {
        console.log(body) // 请求成功的处理逻辑
    }
});

按行读取文本文件

添加引用

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const fs = window.require("fs");
var readline = window.require("readline");

方法

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{
    readFileToArr(fReadName, callback) {
        var fRead = fs.createReadStream(fReadName);
        var objReadline = readline.createInterface({
            input: fRead
        });
        var arr = new Array();
        objReadline.on("line", function(line) {
            arr.push(line);
        });
        objReadline.on("close", function() {
            callback(arr);
        });
    },
    readfile() {
        this.readFileToArr("public/wordlist.txt", function(arr) {
            var arr_new = [];
            arr.forEach((item) => {
                var item_arr = item.split(" ");
                if (item_arr.length > 0 && item_arr[1]) {
                    arr_new.push(item_arr[0]);
                }
            });
            console.info(arr_new);
        });
    }
}