java生成word报告echart_java后台生成echarts图片

由于最近项目需要在java后台生成echarts图片，花时间研究了下这个，顺便分享下；

1.首先需要先下载echarts本地服务器；

(1)网盘:链接：https://pan.baidu.com/s/1kTZ9JWsU48PTTG809HurRA  提取码：b69t

(2)

获取后放入本地解压到例如D:/TEST下

D:\TEST\phantomjs-2.1.1-windows\bin\phantomjs.exe D:\TEST\saintlee-echartsconvert-master\echartsconvert\echarts-convert.js -s -p 6666

解压之后可以使用cmd命令启动这个服务,输入以上命令出现   echarts-convert server start success. [pid]=10500 提示即启动成功；

2.此服务启动成功后就是代码了

以下是springboot项目整体结构了采用了Maven导包方式，需要utils下和pom文件需要导入相应的包

(1)导入pom.xml包

org.freemarker

freemarker

2.3.28

org.apache.httpcomponents

httpclient

4.5.7

com.alibaba

fastjson

1.2.68

org.apache.commons

commons-pool2

(2)3个工具类分别如下，根据需求可自行修改逻辑

package com.lxp.demo.utils;/**

* @projectName: ruoyi

* @packageName: com.rmis.common.utils.chart

* @className: HttpUtil

* @description: ${description}

* @author: hrs

* @date: 2020-07-16 15:25

*/

import org.apache.http.HttpEntity;

import org.apache.http.NameValuePair;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.entity.UrlEncodedFormEntity;

import org.apache.http.client.methods.CloseableHttpResponse;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.impl.client.CloseableHttpClient;

import org.apache.http.impl.client.HttpClients;

import org.apache.http.message.BasicNameValuePair;

import org.apache.http.util.EntityUtils;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

import java.util.Map;

public class HttpUtil {

public static String post(String url, Map params, String charset)

throws ClientProtocolException, IOException {

String responseEntity = "";

// 创建CloseableHttpClient对象

CloseableHttpClient client = HttpClients.createDefault();

// 创建post方式请求对象

HttpPost httpPost = new HttpPost(url);

// 生成请求参数

List nameValuePairs = new ArrayList<>();

if (params != null) {

for (Map.Entry entry : params.entrySet()) {

nameValuePairs.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));

}

}

// 将参数添加到post请求中

httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs, charset));

// 发送请求，获取结果(同步阻塞)

CloseableHttpResponse response = client.execute(httpPost);

// 获取响应实体

HttpEntity entity = response.getEntity();

if (entity != null) {

// 按指定编码转换结果实体为String类型

responseEntity = EntityUtils.toString(entity, charset);

}

// 释放资源

EntityUtils.consume(entity);

response.close();

return responseEntity;

}

}

package com.lxp.demo.utils;/**

* @projectName: ruoyi

* @packageName: com.rmis.common.utils.chart

* @className: FreemarkerUtil

* @description: ${description}

* @author: hrs

* @date: 2020-07-16 15:26

*/

import freemarker.template.Configuration;

import freemarker.template.Template;

import freemarker.template.TemplateException;

import java.io.IOException;

import java.io.StringWriter;

import java.io.UnsupportedEncodingException;

import java.util.Map;

/**

* @author msh

* @date2020/7/16

*/

public class FreemarkerUtil {

private static final String path = FreemarkerUtil.class.getClassLoader().getResource("").getPath();

public static String generateString(String templateFileName, String templateDirectory, Map datas)

throws IOException, TemplateException {

Configuration configuration = new Configuration(Configuration.VERSION_2_3_0);

// 设置默认编码

configuration.setDefaultEncoding("UTF-8");

//获取模板地址

configuration.setClassForTemplateLoading(FreemarkerUtil.class,templateDirectory);

// 生成模板对象

Template template = configuration.getTemplate(templateFileName);

// 将datas写入模板并返回

try (StringWriter stringWriter = new StringWriter()) {

template.process(datas, stringWriter);

stringWriter.flush();

return stringWriter.getBuffer().toString();

}

}

}

package com.lxp.demo.utils;

import com.alibaba.fastjson.JSON;

import com.alibaba.fastjson.JSONObject;

import freemarker.template.TemplateException;

import org.apache.http.client.ClientProtocolException;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import sun.misc.BASE64Decoder;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.OutputStream;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

/**

* @author msh

* @date2020/7/16

*/

public class EchartsUtil {

/**

* 临时文件夹路径

*/

public static final String TEMP_FILE_PATH = "D:/tempFile/";

private static final String SUCCESS_CODE = "1";

private static final Logger logger = LoggerFactory.getLogger(EchartsUtil.class);

public static String generateEchartsBase64(String option) throws ClientProtocolException, IOException {

String base64 = "";

if (option == null) {

return base64;

}

option = option.replaceAll("\\s+", "").replaceAll("\"", "'");

// 将option字符串作为参数发送给echartsConvert服务器

Map params = new HashMap<>();

params.put("opt", option);

String response = HttpUtil.post("http://localhost:6666", params, "utf-8");

// 解析echartsConvert响应

JSONObject responseJson = JSON.parseObject(response);

String code = responseJson.getString("code");

// 如果echartsConvert正常返回

if (SUCCESS_CODE.equals(code)) {

base64 = responseJson.getString("data");

}

// 未正常返回

else {

String string = responseJson.getString("msg");

throw new RuntimeException(string);

}

return base64;

}

public static void getImage(Map datas) throws IOException {

// 生成option字符串

String option = null;

try {

if (!datas.containsKey("ftl")){

logger.error("没有指定生成图表的模板！");

}

option = FreemarkerUtil.generateString((String) datas.get("ftl"), "/template", datas);

} catch (TemplateException e) {

logger.error(e.getMessage());

}

// 根据option参数

String base64 = generateEchartsBase64(option);

File file = new File(TEMP_FILE_PATH);

if(!file.exists()) {

// 如果不存在就创建文件

file.mkdir();

}

BASE64Decoder decoder = new BASE64Decoder();

try (OutputStream out = new FileOutputStream(TEMP_FILE_PATH+"test.jpg")){

// 解密

byte[] b = decoder.decodeBuffer(base64);

for (int i = 0; i < b.length; ++i) {

if (b[i] < 0) {

b[i] += 256;

}

}

out.write(b);

out.flush();

}

}

}

以上是所有工具类的代码，解释基本都有，最后还需要一个echarts图模板  option.ftl 如下:

{

title: {

text: '功率调节计算'

},

tooltip: {

trigger: 'axis'

},

legend: {

data: ['AO', 'AO*']

},

xAxis: {

type: 'category',

boundaryGap: false,

data: ${aohour}

},

yAxis: {

type: 'value'

},

series: [

{

name: 'AO',

type: 'line',

stack: '总量',

data: ${aoList},

smooth : true

},

{

name: 'AO*',

type: 'line',

stack: '总量',

data: ${aoxList},

smooth : true

},

]

}

(3)最后一部是执行EchartUtils的测试方法

public static void main(String[] args) {

//制造数据

List aoxList = new ArrayList<>();

aoxList.add("2"); aoxList.add("4"); aoxList.add("7");aoxList.add("9"); aoxList.add("10"); aoxList.add("9");

aoxList.add("8"); aoxList.add("8"); aoxList.add("7");

List aoList = new ArrayList<>();

aoList.add("1"); aoList.add("4"); aoList.add("7");aoList.add("9"); aoList.add("10"); aoList.add("10");

aoList.add("10"); aoList.add("10"); aoList.add("10");

List aohour = new ArrayList<>();

aohour.add("1");aohour.add("2");aohour.add("3");aohour.add("4");aohour.add("5");aohour.add("6");aohour.add("7");

aohour.add("8");aohour.add("9");

// 模板参数

HashMap datas = new HashMap<>();

//aohour、aoList、aoxList对应模板/template/option.ftl中的x和y轴的名字,模板可自行修改，

//ftl 为设置模板的名字。路径在/templates下

datas.put("aoxList", JSON.toJSONString(aoxList));

datas.put("aoList", JSON.toJSONString(aoList));

datas.put("aohour", JSON.toJSONString(aohour));

datas.put("ftl", "option.ftl");

try {

EchartsUtil.getImage(datas);

} catch (IOException e) {

e.printStackTrace();

}

}

执行后在代码设置的路径下会生成这样的图片及完成功能，后续会继续如何将图片以及文字替换掉word模板文档中的字和图片