java后台生成echarts图表并保存图片

public class EchartsUtils {

    private static final String JSpath = "C:echarts-convertecharts-convert1.js";

    public static void main(String[] args) {

        String imgName = "D:/平台/tes" + UUID.randomUUID().toString().substring(0, 4) + ".png ";

        String option = "{xAxis: {type: 'category',data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']},yAxis: {type: 'value'},series: [{data: [820, 932, 901, 934, 1290, 1330, 1320],type: 'line'}]}";

        String base64Img = generateEChart(option,1600,900);

        System.out.println(base64Img);

    }

    public static String generateEChart(String options,int width,int height) {

        String fileName= "test-"+UUID.randomUUID().toString().substring(0, 8) + ".png";

        String imgPath = "D:/平台/img/" +fileName;

        String dataPath = writeFile(options);

        try {

            File file = new File(imgPath);    

            if (!file.exists()) {  

                File dir = new File(file.getParent());

                dir.mkdirs();

                file.createNewFile();

            }

            String cmd = "phantomjs " + JSpath + " -infile " + dataPath + " -outfile " + imgPath + " -width " + width + " -height " + height;

            System.out.println(cmd);

            Process process = Runtime.getRuntime().exec(cmd);

            BufferedReader input = new BufferedReader(new InputStreamReader(process.getInputStream()));

            String line = "";

            while ((line = input.readLine()) != null) {

            }

            input.close();

        } catch (IOException e) {

            e.printStackTrace();

        }finally{

            String base64Img = ImageToBase64(imgPath);

            return base64Img.replaceAll("s*", "");

        }

    }

    public static String writeFile(String options) {

        String dataPath="D:/平台/data/data"+ UUID.randomUUID().toString().substring(0, 8) +".json";

        try {

            File writename = new File(dataPath);

            if (!writename.exists()) {  

                File dir = new File(writename.getParent());

                dir.mkdirs();

                writename.createNewFile();

            }

            BufferedWriter out = new BufferedWriter(new FileWriter(writename));

            out.write(options);

            out.flush();

            out.close();

        } catch (IOException e) {

            e.printStackTrace();

        }

        return dataPath;

    }

    /**

     * 图片文件转为base64

     * @param imgPath

     */

    private static String ImageToBase64(String imgPath) {

        byte[] data = null;

        try {

            InputStream in = new FileInputStream(imgPath);

            data = new byte[in.available()];

            in.read(data);

            in.close();

        } catch (IOException e) {

            e.printStackTrace();

        }

        BASE64Encoder encoder = new BASE64Encoder();

        return encoder.encode(Objects.requireNonNull(data));

    }

    /**

     * 删除文件

     *

     * @param pathname

     * @return

     * @throws IOException

     */

    public static boolean deleteFile(String pathname){

        boolean result = false;

        File file = new File(pathname);

        if (file.exists()) {

            file.delete();

            result = true;

            System.out.println("文件已经被成功删除");

        }

        return result;

    }

}

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