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("42501");    }    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
     
       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);        }      }}
     

 

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