poi報表開發1-PhantomJS工具安裝

1.概要

PhantomJS是一個無界面的，可腳本編程的WebKit瀏覽器引擎，可以在後臺模擬瀏覽器的工具。可選裝Linux版本和Windows版本。

主要用來在後臺生成echarts圖表的圖片，供報表使用。

2.Linux下安裝

https://phantomjs.org/download.html，選擇版本Linux 64-bit，獲得壓縮包phantomjs-2.1.1-linux-x86_64.tar.bz2。

解壓命令：

tar xjf phantomjs-2.1.1-linux-x86_64.tar.bz2

 

修改解壓的目錄名爲phantomjs（有點號後續會有報錯，故去掉）：

設置環境變量，並使得配置文件生效，命令：

export PATH=${PATH}:/home/tams/software/phantomjs/bin
source /etc/profile

測試執行例子中的js，命令:

phantomjs /home/tams/software/phantomjs/examples/hello.js

輸出“Hello, world!”表示安裝成功。

 

3.Windows下安裝

https://phantomjs.org/download.html，選擇版本Windows，獲得壓縮包phantomjs-2.1.1-windows.zip。解壓：

添加環境變量：

測試命令：

phantomjs D:\it\work\software\phantomjs-2.1.1-windows\examples\hello.js

輸出“Hello, world!”表示安裝成功。

4.添加echarts-js文件

三個js文件echarts.min.js、jquery-3.2.1.min.js和echarts-convert.js必須都放在同一目錄下。這裏我暫且都放在phantomjs的bin目錄下。

 

echarts.min.js、jquery-3.2.1.min.js可從官網下載。echarts-convert.js爲開發的js，且生成圖片的高寬在其中配置：

echarts-convert.js源碼如下（參考文章：java 實現後臺生成echarts 圖片（PhantomJS瀏覽器引擎(window系統與linux系統)）)

(function () {
var system = require('system');
var fs = require('fs');
var config = {
    // define the location of js files
    JQUERY: 'jquery-3.2.1.min.js',
    //ESL: 'esl.js',
    ECHARTS: 'echarts.min.js',
    // default container width and height
    DEFAULT_WIDTH: '700',
    DEFAULT_HEIGHT: '300'
}, parseParams, render, pick, usage;

usage = function () {
    console.log("\nUsage: phantomjs echarts-convert.js -options options -outfile filename -width width -height height"
        + "OR"
        + "Usage: phantomjs echarts-convert.js -infile URL -outfile filename -width width -height height\n");
};

pick = function () {
    var args = arguments, i, arg, length = args.length;
    for (i = 0; i < length; i += 1) {
        arg = args[i];
        if (arg !== undefined && arg !== null && arg !== 'null' && arg != '0') {
            return arg;
        }
    }
};

parseParams = function () {
    var map = {}, i, key;
    if (system.args.length < 2) {
        usage();
        phantom.exit();
    }
    for (i = 0; i < system.args.length; i += 1) {
        if (system.args[i].charAt(0) === '-') {
            key = system.args[i].substr(1, i.length);
            if (key === 'infile') {
                // get string from file
                // force translate the key from infile to options.
                key = 'options';
                try {
                    map[key] = fs.read(system.args[i + 1]).replace(/^\s+/, '');
                } catch (e) {
                    console.log('Error: cannot find file, ' + system.args[i + 1]);
                    phantom.exit();
                }
            } else {
                map[key] = system.args[i + 1].replace(/^\s+/, '');
            }
        }
    }
    return map;
};

render = function (params) {
    var page = require('webpage').create(), createChart;

    var bodyMale = config.SVG_MALE;
    page.onConsoleMessage = function (msg) {
        console.log(msg);
    };

    page.onAlert = function (msg) {
        console.log(msg);
    };

    createChart = function (inputOption, width, height,config) {
        var counter = 0;
        function decrementImgCounter() {
            counter -= 1;
            if (counter < 1) {
                console.log(messages.imagesLoaded);
            }
        }

        function loadScript(varStr, codeStr) {
            var script = $('<script>').attr('type', 'text/javascript');
            script.html('var ' + varStr + ' = ' + codeStr);
            document.getElementsByTagName("head")[0].appendChild(script[0]);
            if (window[varStr] !== undefined) {
                console.log('Echarts.' + varStr + ' has been parsed');
            }
        }

        function loadImages() {
            var images = $('image'), i, img;
            if (images.length > 0) {
                counter = images.length;
                for (i = 0; i < images.length; i += 1) {
                    img = new Image();
                    img.onload = img.onerror = decrementImgCounter;
                    img.src = images[i].getAttribute('href');
                }
            } else {
                console.log('The images have been loaded');
            }
        }
        // load opitons
        if (inputOption != 'undefined') {
            // parse the options
            loadScript('options', inputOption);
            // disable the animation
            options.animation = false;
        }

        // we render the image, so we need set background to white.
        $(document.body).css('backgroundColor', 'white');
        var container = $("<div>").appendTo(document.body);
        container.attr('id', 'container');
        container.css({
            width: width,
            height: height
        });
        // render the chart
        var myChart = echarts.init(container[0]);
        myChart.setOption(options);
        // load images
        loadImages();
        return myChart.getDataURL();
    };

    // parse the params
    page.open("about:blank", function (status) {
        // inject the dependency js
        page.injectJs(config.ESL);
        page.injectJs(config.JQUERY);
        page.injectJs(config.ECHARTS);


        var width = pick(params.width, config.DEFAULT_WIDTH);
        var height = pick(params.height, config.DEFAULT_HEIGHT);

        // create the chart
        var base64 = page.evaluate(createChart, params.options, width, height,config);
        fs.write("base64.txt",base64);
        // define the clip-rectangle
        page.clipRect = {
            top: 0,
            left: 0,
            width: width,

            height: height
        };
        // render the image
        page.render(params.outfile);
        console.log('render complete:' + params.outfile);
        // exit
        phantom.exit();
    });
};
// get the args
var params = parseParams();

// validate the params
if (params.options === undefined || params.options.length === 0) {
    console.log("ERROR: No options or infile found.");
    usage();
    phantom.exit();
}
// set the default out file
if (params.outfile === undefined) {
    var tmpDir = fs.workingDirectory + '/tmp';
    // exists tmpDir and is it writable?
    if (!fs.exists(tmpDir)) {
        try {
            fs.makeDirectory(tmpDir);
        } catch (e) {
            console.log('ERROR: Cannot make tmp directory');
        }
    }
    params.outfile = tmpDir + "/" + new Date().getTime() + ".png";
}

// render the image
render(params);
}());

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