activity获取流程图

网上找到可能会报错 是
InputStream inputStream = p.generateDiagram(bpmnModel, “png”, highLightedActivitis, highLightedFlows,“宋体”,“宋体”,“宋体”,null, 1.0);
这一块，简单看了下，就是花流程图的方法，有好多种参数

Controller层
public void queryPicByInstanceID(@RequestParam(value = “instanceID”) String instanceID,HttpServletRequest request, HttpServletResponse response) throws IOException {

    response.setContentType("image/jpeg");
    InputStream is =flowOperation.getTaskTraceDiagram(instanceID);//getProcessInstanceImageByInstanceID(instanceID);

    if (is != null){
        int i = is.available(); // 得到文件大小
        byte data[] = new byte[i];
        is.read(data); // 读数据
        is.close();
        response.setContentType("image/png");  // 设置返回的文件类型
        OutputStream toClient = response.getOutputStream(); // 得到向客户端输出二进制数据的对象
        toClient.write(data); // 输出数据
        toClient.close();
    }
}

Server层
public InputStream getTaskTraceDiagram(String processInstanceId) {
ProcessEngineConfiguration processEngineConfiguration = null;
//获取历史流程实例
HistoricProcessInstance processInstance = historyService.createHistoricProcessInstanceQuery().processInstanceId(processInstanceId).singleResult();
//获取流程图
BpmnModel bpmnModel = repositoryService.getBpmnModel(processInstance.getProcessDefinitionId());
processEngineConfiguration = pe.getProcessEngineConfiguration();//processEngine.getProcessEngineConfiguration();processEngineConfiguration
Context.setProcessEngineConfiguration((ProcessEngineConfigurationImpl) processEngineConfiguration);

    ProcessDefinitionEntity definitionEntity = (ProcessDefinitionEntity)repositoryService.getProcessDefinition(processInstance.getProcessDefinitionId());

    List highLightedActivitList =  historyService.createHistoricActivityInstanceQuery().processInstanceId(processInstanceId).list();
    //高亮环节id集合
    List highLightedActivitis = new ArrayList();
    //高亮线路id集合
    List highLightedFlows = getHighLightedFlows(definitionEntity,highLightedActivitList);

    for(HistoricActivityInstance tempActivity : highLightedActivitList){
        String activityId = tempActivity.getActivityId();
        highLightedActivitis.add(activityId);
    }
    ProcessDiagramGenerator p = new DefaultProcessDiagramGenerator();
    InputStream inputStream = p.generateDiagram(bpmnModel, "png", highLightedActivitis, highLightedFlows,"宋体","宋体","宋体",null, 1.0);

    return inputStream;
}

/**
* 获取需要高亮的线
* @param processDefinitionEntity
* @param historicActivityInstances
* @return
*/
private List getHighLightedFlows(
ProcessDefinitionEntity processDefinitionEntity,
List historicActivityInstances) {
List highFlows = new ArrayList();// 用以保存高亮的线flowId
for (int i = 0; i < historicActivityInstances.size() - 1; i++) {// 对历史流程节点进行遍历
ActivityImpl activityImpl = processDefinitionEntity
.findActivity(historicActivityInstances.get(i)
.getActivityId());// 得到节点定义的详细信息
List sameStartTimeNodes = new ArrayList();// 用以保存后需开始时间相同的节点
ActivityImpl sameActivityImpl1 = processDefinitionEntity
.findActivity(historicActivityInstances.get(i + 1)
.getActivityId());
// 将后面第一个节点放在时间相同节点的集合里
sameStartTimeNodes.add(sameActivityImpl1);
for (int j = i + 1; j < historicActivityInstances.size() - 1; j++) {
HistoricActivityInstance activityImpl1 = historicActivityInstances
.get(j);// 后续第一个节点
HistoricActivityInstance activityImpl2 = historicActivityInstances
.get(j + 1);// 后续第二个节点
if (activityImpl1.getStartTime().equals(
activityImpl2.getStartTime())) {
// 如果第一个节点和第二个节点开始时间相同保存
ActivityImpl sameActivityImpl2 = processDefinitionEntity
.findActivity(activityImpl2.getActivityId());
sameStartTimeNodes.add(sameActivityImpl2);
} else {
// 有不相同跳出循环
break;
}
}
List pvmTransitions = activityImpl
.getOutgoingTransitions();// 取出节点的所有出去的线
for (PvmTransition pvmTransition : pvmTransitions) {
// 对所有的线进行遍历
ActivityImpl pvmActivityImpl = (ActivityImpl) pvmTransition
.getDestination();
// 如果取出的线的目标节点存在时间相同的节点里，保存该线的id，进行高亮显示
if (sameStartTimeNodes.contains(pvmActivityImpl)) {
highFlows.add(pvmTransition.getId());
}
}
}
return highFlows;
}
结果
同时还有一个问题~没百度到怎么弄，api也没找到，就是把当前节点用别的颜色显示。。