java生成动态图片例如统计图雷达图

java生成动态图片例如统计图雷达图。可以用到动态导出word,pdf文件中。

工具类

package com.wjdc.web.controller.echarts;

import com.alibaba.fastjson2.JSONArray;
import com.alibaba.fastjson2.JSONObject;

import java.io.*;
import java.text.SimpleDateFormat;
import java.util.*;

/**
 * @Title: EchartsTest
 * @Date 2022/5/11 17:28
 * @Author Yinan
 * @Description: 测试Echarts后台渲染生成图片
 */
public class EchartsUtil {

    /**
     * echarts获取图片base64编码URL头
     */
    private static final String BASE64FORMAT = "data:image/png;base64,";
    // windows
      private static final String ECHARTS_PATH = "D:\\phantomjs\\echarts-convert.js";
    // linux
   // private static final String ECHARTS_PATH = "/root/ceshi/echarts-convert.js";


    private static final String options = "{\n" +
            "\t\"grid\": {\n" +
            "\t\t\"left\": \"10%\",\n" +
            "\t\t\"right\": \"4%\",\n" +
            "\t\t\"bottom\": \"3%\",\n" +
            "\t\t\"containLabel\": true\n" +
            "\t},\n" +
            "\t\"tooltip\": {\n" +
            "\t\t\"trigger\": \"axis\"\n" +
            "\t},\n" +
            "\t\"splitLine\": {\n" +
            "\t\t\"show\": true,\n" +
            "\t\t\"lineStyle\": {\n" +
            "\t\t\t\"type\": \"dashed\",\n" +
            "\t\t\t\"color\": \"#aea7ac\"\n" +
            "\t\t}\n" +
            "\t},\n" +
            "\t\"xAxis\": {\n" +
            "\t\t\"boundaryGap\": false,\n" +
            "\t\t\"type\": \"value\",\n" +
            "\t\t\"min\": 45,\n" +
            "\t\t\"max\": 95,\n" +
            "\t\t\"data\": [\n" +
            "\t\t\t\"Mon\",\n" +
            "\t\t\t\"Tue\",\n" +
            "\t\t\t\"Wed\",\n" +
            "\t\t\t\"Thu\",\n" +
            "\t\t\t\"Fri\",\n" +
            "\t\t\t\"Sat\",\n" +
            "\t\t\t\"Sun\"\n" +
            "\t\t]\n" +
            "\t},\n" +
            "\t\"yAxis\": {\n" +
            "\n" +
            "\t\t\"boundaryGap\": false,\n" +
            "\t\t\"splitLine\": {\n" +
            "\t\t\t\"show\": true,\n" +
            "\t\t\t\"lineStyle\": {\n" +
            "\t\t\t\t\"type\": \"dashed\",\n" +
            "\t\t\t\t\"color\": \"#aea7ac\"\n" +
            "\t\t\t}\n" +
            "\t\t},\n" +
            "\t\t\"type\": \"category\",\n" +
            "\t\t\"axisLabel\": {\n" +
            "\t\t\t\"formatter\": \"{value}\",\n" +
          //  "\t\t\t\"fontWeight\": \"bold\",\n" +
            "\t\t\t\"fontSize\": 20\n" +
            "\t\t}\n" +
            "\t},\n" +
            "\t\"series\": [{\n" +
            "\t\t\t\"name\": \"分数\",\n" +
            "\t\t\t\"type\": \"line\",\n" +
            "\t\t\t\"data\": [\n" +
            "\t\t\t\t10,\n" +
            "\t\t\t\t11,\n" +
            "\t\t\t\t13,\n" +
            "\t\t\t\t11,\n" +
            "\t\t\t\t12,\n" +
            "\t\t\t\t12,\n" +
            "\t\t\t\t9\n" +
            "\t\t\t],\n" +
            "\t\t\t\"label\": {\n" +

            "\t\t\t\t\"show\": true,\n" +
            "\t\t\t\t\"position\": \"top\"\n" +
            "\t\t\t},\n" +
            "\t\t\t\"markPoint\": {}\n" +
            "\t\t},\n" +
            "\t\t{\n" +
            "\t\t\t\"name\": \"常模线\",\n" +
            "\t\t\t\"type\": \"line\",\n" +
            "\t\t\t\"data\": [\n" +
            "\t\t\t\t1, -2,\n" +
            "\t\t\t\t2,\n" +
            "\t\t\t\t5,\n" +
            "\t\t\t\t3,\n" +
            "\t\t\t\t2,\n" +
            "\t\t\t\t0\n" +
            "\t\t\t],\n" +
            "\t\t\t\"label\": {\n" +
            "\t\t\t\t\"show\": true,\n" +
            "\t\t\t\t\"position\": \"top\"\n" +
            "\t\t\t}\n" +
            "\t\t}\n" +
            "\t]\n" +
            "}" ;


    public static String echartsToBase64(List<String> nameList, List<Double> doubleScoreList, List<Double> doubleScoreListLevel) throws Exception {
        BufferedReader input = null;
        String line;
        String base64 = "";

        // 将options转换为JSONObject
        JSONObject parseObject = JSONObject.parseObject(options);

        // 将yAxis中的data替换为nameList
        JSONObject parseObject1 = JSONObject.parseObject(parseObject.getString("yAxis"));
        parseObject1.put("data", nameList);
        parseObject.put("yAxis", parseObject1);

        // 将series中的data替换为doubleScoreList
        JSONArray jsonArray = JSONArray.parseArray(parseObject.getString("series"));
        jsonArray.getJSONObject(0).put("data", doubleScoreList);

        //判断是否有常模线
        if (doubleScoreListLevel != null && doubleScoreListLevel.size() > 0) {
            jsonArray.getJSONObject(1).put("data", doubleScoreListLevel);
        }else {
            jsonArray.remove(1);
        }

        parseObject.put("series", jsonArray);


        // 将JSONObject转换为String 写入文件 并获取文件路径
        String dataPath = writeFile(parseObject.toJSONString());
        try {
            /**
             * 命令格式：
             * phantomjs echarts-convert.js -infile optionURl -width width -height height
             * 可选参数：-width width -height height
             * 备注：
             * phantomjs添加到环境变量中后可以直接使用，这里防止环境变量配置问题所以直接使用绝对路径
             */
            String cmd = " phantomjs " + ECHARTS_PATH + " -infile " + dataPath
                    + " -width " + 650 + " -height " + 800;
            Process process = Runtime.getRuntime().exec(cmd);
            /**
             * 获取控制台输出信息
             * 通过JS中使用console.log()打印输出base64编码
             * 获取进程输入流，进行base64编码获取
             */
            input = new BufferedReader(new InputStreamReader(process.getInputStream()));
            while ((line = input.readLine()) != null) {
                if (line.startsWith(BASE64FORMAT)) {
                    base64 = line;//.replace(BASE64FORMAT, "");
                    break;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                input.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
//        System.out.println(base64);
//        getFileFromBase64(base64);
        return base64;
    }


    /*
     *
     * options生成文件存储
     */
    public static String writeFile(String options) {
         // windows
         String dataPath = "D:\\" + UUID.randomUUID().toString().substring(0, 8) + ".json";
         // linux
      //   String dataPath = "/root/ceshi/" + UUID.randomUUID().toString().substring(0, 8) + ".json";
        try {
            // option写入文本文件 用于执行命令
            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(); // 把缓存区内容压入文件
            out.close(); // 最后关闭文件
        } catch (IOException e) {
            e.printStackTrace();
        }
        return dataPath;
    }



    //base64转file保存到本地
    public File getFileFromBase64(String base) throws Exception {
        String base64Pic = base;
        File file = null;
        Map<String, Object> resultMap = new HashMap<String, Object>();
        if (base64Pic == null) { // 图像数据为空
            resultMap.put("resultCode", 0);
            resultMap.put("msg", "图片为空");
        } else {
            Base64.Decoder decoder = Base64.getDecoder();
            String baseValue = base64Pic.replaceAll(" ", "+");//前台在用Ajax传base64值的时候会把base64中的+换成空格，所以需要替换回来。
            byte[] b = decoder.decode(baseValue.replace("data:image/png;base64,", ""));//去除base64中无用的部分
            base64Pic = base64Pic.replace("base64,", "");
            SimpleDateFormat df2 = new SimpleDateFormat("yyyy-MM-dd");
            String nowDate = df2.format(new Date());
            String imgFilePath = "f:\\" + nowDate + "\\" + System.currentTimeMillis();
            File file1 = new File(imgFilePath);
            if (!file1.exists() && !file1.isDirectory()) {//判断文件路径下的文件夹是否存在，不存在则创建
                file1.mkdirs();
            }
            try {
                for (int i = 0; i < b.length; ++i) {
                    if (b[i] < 0) {// 调整异常数据
                        b[i] += 256;
                    }
                }
                file = new File(imgFilePath + "\\" + System.currentTimeMillis()+".png");
                // 如果要返回file文件这边return就可以了,存到临时文件中
                OutputStream out = new FileOutputStream(file.getPath());
                out.write(b);
                out.flush();
                out.close();
            } catch (Exception e) {
                resultMap.put("resultCode", 0);
                resultMap.put("msg", "存储异常");
            }

        }
        return file;
    }
}

具体使用，获取对应的图片base64

EchartsUtil.echartsToBase64(pdfData.getNameList(), pdfData.getDoubleScoreList(), pdfData.getDoubleScoreListLevel()))