需求是导出word,里面有数据统计图表。
要从后端直接导出图表的话,思路是这样的:
先通过echarts生成图片,通过phantomjs 截图,将图片暂存在本地,再将图片转换成base64,然后放入word。
phantomjs 是一个基于js的webkit内核无头浏览器 也就是没有显示界面的浏览器。
一、准备word模板,转换成xml,需要填入数据的地方用${字段},需要天出图片的地方可以先随便一张用图片替代,方便之后找到图片插入位置。这里就不多说了
二、准备环境、依赖
1、准备js,需要用到的,放在同一个文件夹下面。自己更改echarts-convert.js的路径

echarts.min.js 和jquery.js 去官网下载
echarts-convert.js的内容如下:
- (function () {
- var system = require('system');
- var fs = require('fs');
- var config = {
- // define the location of js files
- //这样写要求这三个js在同一个文件夹下
- JQUERY: 'jquery-3.5.1.min.js',
- //ESL: 'esl.js',
- ECHARTS: 'echarts.min.js',
- // default container width and height
- DEFAULT_WIDTH: '400',
- DEFAULT_HEIGHT: '600'
- }, 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 = $("").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);
- }());
复制代码
2、安装phantomjs
网站:https://phantomjs.org/download.html
选择合适的版本,我下载的是windows的,下载解压

配置环境变量:

然后测试是否安装成功,在命令行 输入:phantomjs -- version

出现版本就表示安装成功了。
3、构建echarts数据,就是option
可以看原文档:https://gitee.com/free/ECharts#https://gitee.com/link?target=http%3A%2F%2Fblog.csdn.net%2Fisea533%2Farticle%2Fdetails%2F43225717
- <dependency>
- <groupId>com.github.abel533</groupId>
- <artifactId>ECharts</artifactId>
- <version>3.0.0.6</version>
- </dependency>
复制代码
三、生成echarts图表
1、构建echarts 的数据option
- /**
- * 构建柱状图
- * @param cate x轴数据
- * @param enterpriseCnt 数据
- * @return
- */
- private static String getOption(List<String> cate, List<Integer> enterpriseCnt){
- GsonOption option = new GsonOption();
- option.title().setText("测试点位数图片"); // 标题
- // 设置图例
- option.legend().data("点位数").x("center");
- Bar bar = new Bar();
- // x轴
- CategoryAxis category = new CategoryAxis();
- category.data(cate.toArray());
- //y 轴
- ValueAxis valueAxis = new ValueAxis();
- bar.data().addAll(enterpriseCnt); // 数据
- option.xAxis(category); //x轴
- option.yAxis(valueAxis); //y轴
- option.series(bar);// 多条柱子放多个bar就行
- String optionStr = option.toString().replace(" ", "");
- log.info(optionStr);
- return optionStr;
- }
复制代码 2、生成echarts图片
- public static String generateEChart(String option, String filepath, String fileName) {
- String dataPath = writeOptionToFile(option, filepath); // 将option 数据写磁盘上用文件保存
- String path = filepath + fileName+".png"; //生成图片路径
- try {
- String JSpath = "D:\\data\\tmp\\echarts-convert.js";
- String cmd = "phantomjs " + JSpath + " -infile " + dataPath + " -outfile " + path;
- log.info(cmd);
- Process process = Runtime.getRuntime().exec(cmd);
- BufferedReader input = new BufferedReader(new InputStreamReader(process.getInputStream(), "UTF-8"));
- String line = "";
- while ((line = input.readLine()) != null) {
- log.info(line);
- }
- input.close();
- // 删除json数据
- File jsonFile = new File(dataPath);
- jsonFile.delete();
- } catch (IOException e) {
- e.printStackTrace();
- }
- return path;
- }
复制代码 - public static String writeOptionToFile(String options, String filepath) {
- String dataPath = filepath +"echart.json";
- try {
- File writename = new File(dataPath);
- if (!writename.getParentFile().exists()) { //文件目录不存在,则先创建,不然会报错
- writename.getParentFile().mkdirs();
- }
- BufferedWriter out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(writename), "UTF-8"));
- out.write(options);
- out.flush();
- out.close();
- } catch (IOException e) {
- e.printStackTrace();
- }
- return dataPath;
- }
复制代码
先测试一哈:

这个时候在文件夹下可以看到图片啦:

四、导出word
准备好数据,图片需要base64编码的,将之前生成的echart图片读入转base64
- public static String imageToBase64(String imgPath) {
- InputStream in = null;
- byte[] data = null;
- try {
- in = new FileInputStream(imgPath);
- data = new byte[in.available()];
- in.read(data);
- in.close();
- } catch(Exception ex) {
- ex.printStackTrace();
- }
- Base64Encoder encoder = new Base64Encoder();
- return encoder.encode(data);
- }
复制代码
然后就是正常word的导出了
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