package com.xinwei;

import java.io.File;

import java.io.InputStream;

import java.util.ArrayList;

import java.util.List;

import org.activiti.bpmn.model.BpmnModel;

import org.activiti.engine.ProcessEngine;

import org.activiti.engine.ProcessEngines;

import org.activiti.engine.TaskService;

import org.activiti.engine.task.Task;

import org.activiti.image.ProcessDiagramGenerator;

import org.apache.commons.io.FileUtils;

import org.apache.commons.io.IOUtils;

public class TraceProcessInstaceUtil {

    public static void main(String[] args) {

        generateImage("");

    }

    public static byte[] generateImage(String processInstanceId){

          //1.创建核心引擎流程对象processEngine

      ProcessEngine processEngine = ProcessEngines.getDefaultProcessEngine();

        TaskService taskService = processEngine.getTaskService();

        Task task = taskService.createTaskQuery().processInstanceId(processInstanceId).singleResult();

        //流程定义

        BpmnModel bpmnModel = processEngine.getRepositoryService().getBpmnModel(task.getProcessDefinitionId()); 

        //正在活动节点

        List<String> activeActivityIds = processEngine.getRuntimeService().getActiveActivityIds(task.getExecutionId());

        ProcessDiagramGenerator pdg = processEngine.getProcessEngineConfiguration().getProcessDiagramGenerator();

       //得到图片输出流（这样加可防止生成的流程图片乱码）

      InputStream inputStream = processEngine.getProcessEngineConfiguration().getProcessDiagramGenerator()

               .generateDiagram(bpmnModel, "png", activeActivityIds, new ArrayList(),

                        processEngine.getProcessEngineConfiguration().getActivityFontName(),

                        processEngine.getProcessEngineConfiguration().getLabelFontName(), null, 1.0);

      try {

          //生成本地图片

          File file = new File("D:/test1.png");

          FileUtils.copyInputStreamToFile(inputStream, file);

          System.out.println("生成流程图成功");

          return IOUtils.toByteArray(inputStream);

       } catch (Exception e) {

           throw new RuntimeException("生成流程图异常！", e);

       } finally {

           IOUtils.closeQuietly(inputStream);

       }

    }

}

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"

    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jee="http://www.springframework.org/schema/jee"

    xmlns:aop="http://www.springframework.org/schema/aop"

    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd

       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd

       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd

       http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.0.xsd

       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">

    <bean id="processEngineConfiguration"

        class="org.activiti.engine.impl.cfg.StandaloneProcessEngineConfiguration">

        <!-- 连接数据的配置 -->

        <property name="jdbcDriver" value="com.mysql.jdbc.Driver"></property>

        <property name="jdbcUrl"

            value="jdbc:mysql://localhost:3306/activitidemo?useUnicode=true&amp;characterEncoding=utf8"></property>

        <property name="jdbcUsername" value="root"></property>

        <property name="jdbcPassword" value="xinwei"></property>

        <property name="activityFontName" value="宋体" />

        <property name="labelFontName" value="宋体" />

        <!-- 没有表创建表 -->

        <property name="databaseSchemaUpdate" value="true"></property>

    </bean>

</beans>