图例
环境
| 软件 | 版本 |
|---|---|
| SpringBoot | 1.5.10 |
| activiti-spring-boot-starter-basic | 6.0 |
生成代码
以下是简化代码：
/**
* 查看实例流程图，根据流程实例ID获取流程图
*/
@RequestMapping(value="traceprocess/{instanceId}",method=RequestMethod.GET)
public void traceprocess(HttpServletResponse response,@PathVariable("instanceId")String instanceId) throws Exception{
InputStream in = flowUtils.getResourceDiagramInputStream(instanceId);
ServletOutputStream output = response.getOutputStream();
IOUtils.copy(in, output);
}
Flow 工具类：
/**
* Flow 工具类
* @author zhipeng.zhang
*/@Componentpublic class FlowUtils {
@Autowired
RuntimeService runservice; @Autowired
private HistoryService historyService; @Autowired
private RepositoryService repositoryService; @Autowired
private ProcessEngineFactoryBean processEngine; /**
* 获取历史节点流程图
* @param id
* @return
*/
public InputStream getResourceDiagramInputStream(String id) { try { // 获取历史流程实例
HistoricProcessInstance historicProcessInstance = historyService.createHistoricProcessInstanceQuery().processInstanceId(id).singleResult(); // 获取流程中已经执行的节点，按照执行先后顺序排序
List<HistoricActivityInstance> historicActivityInstanceList = historyService.createHistoricActivityInstanceQuery().processInstanceId(id).orderByHistoricActivityInstanceId().asc().list(); // 构造已执行的节点ID集合
List<String> executedActivityIdList = new ArrayList<String>(); for (HistoricActivityInstance activityInstance : historicActivityInstanceList) {
executedActivityIdList.add(activityInstance.getActivityId());
} // 获取bpmnModel
BpmnModel bpmnModel = repositoryService.getBpmnModel(historicProcessInstance.getProcessDefinitionId()); // 获取流程已发生流转的线ID集合
List<String> flowIds = this.getExecutedFlows(bpmnModel, historicActivityInstanceList); // 使用默认配置获得流程图表生成器，并生成追踪图片字符流
ProcessDiagramGenerator processDiagramGenerator = processEngine.getProcessEngineConfiguration().getProcessDiagramGenerator(); //你也可以 new 一个
//DefaultProcessDiagramGenerator processDiagramGenerator = new DefaultProcessDiagramGenerator();
InputStream imageStream = processDiagramGenerator.generateDiagram(bpmnModel, "png", executedActivityIdList, flowIds, "宋体", "微软雅黑", "黑体", null, 2.0); return imageStream;
} catch (Exception e) {
e.printStackTrace(); return null;
}
}
private List<String> getExecutedFlows(BpmnModel bpmnModel, List<HistoricActivityInstance> historicActivityInstances) { // 流转线ID集合
List<String> flowIdList = new ArrayList<String>(); // 全部活动实例
List<FlowNode> historicFlowNodeList = new LinkedList<FlowNode>(); // 已完成的历史活动节点
List<HistoricActivityInstance> finishedActivityInstanceList = new LinkedList<HistoricActivityInstance>(); for (HistoricActivityInstance historicActivityInstance : historicActivityInstances) {
historicFlowNodeList.add((FlowNode) bpmnModel.getMainProcess().getFlowElement(historicActivityInstance.getActivityId(), true)); if (historicActivityInstance.getEndTime() != null) {
finishedActivityInstanceList.add(historicActivityInstance);
}
} // 遍历已完成的活动实例，从每个实例的outgoingFlows中找到已执行的
FlowNode currentFlowNode = null; for (HistoricActivityInstance currentActivityInstance : finishedActivityInstanceList) { // 获得当前活动对应的节点信息及outgoingFlows信息
currentFlowNode = (FlowNode) bpmnModel.getMainProcess().getFlowElement(currentActivityInstance.getActivityId(), true);
List<SequenceFlow> sequenceFlowList = currentFlowNode.getOutgoingFlows(); /**
* 遍历outgoingFlows并找到已已流转的
* 满足如下条件认为已已流转：
* 1.当前节点是并行网关或包含网关，则通过outgoingFlows能够在历史活动中找到的全部节点均为已流转
* 2.当前节点是以上两种类型之外的，通过outgoingFlows查找到的时间最近的流转节点视为有效流转
*/
FlowNode targetFlowNode = null; if (BpmsActivityTypeEnum.PARALLEL_GATEWAY.getType().equals(currentActivityInstance.getActivityType())
|| BpmsActivityTypeEnum.INCLUSIVE_GATEWAY.getType().equals(currentActivityInstance.getActivityType())) { // 遍历历史活动节点，找到匹配Flow目标节点的
for (SequenceFlow sequenceFlow : sequenceFlowList) {
targetFlowNode = (FlowNode) bpmnModel.getMainProcess().getFlowElement(sequenceFlow.getTargetRef(), true); if (historicFlowNodeList.contains(targetFlowNode)) {
flowIdList.add(sequenceFlow.getId());
}
}
} else {
List<Map<String, String>> tempMapList = new LinkedList<Map<String,String>>(); // 遍历历史活动节点，找到匹配Flow目标节点的
for (SequenceFlow sequenceFlow : sequenceFlowList) { for (HistoricActivityInstance historicActivityInstance : historicActivityInstances) { if (historicActivityInstance.getActivityId().equals(sequenceFlow.getTargetRef())) {
tempMapList.add(UtilMisc.toMap("flowId", sequenceFlow.getId(), "activityStartTime", String.valueOf(historicActivityInstance.getStartTime().getTime())));
}
}
} // 遍历匹配的集合，取得开始时间最早的一个
long earliestStamp = 0L;
String flowId = null; for (Map<String, String> map : tempMapList) { long activityStartTime = Long.valueOf(map.get("activityStartTime")); if (earliestStamp == 0 || earliestStamp >= activityStartTime) {
earliestStamp = activityStartTime;
flowId = map.get("flowId");
}
}
flowIdList.add(flowId);
}
} return flowIdList;
}
}
UtilMisc 工具类：
public class UtilMisc { public static <V, V1 extends V, V2 extends V> Map<String, V> toMap(String name1, V1 value1, String name2, V2 value2) { return populateMap(new HashMap<String, V>(), name1, value1, name2, value2);
} @SuppressWarnings("unchecked")
private static <K, V> Map<String, V> populateMap(Map<String, V> map, Object... data) { for (int i = 0; i < data.length;) {
map.put((String) data[i++], (V) data[i++]);
} return map;
}
}
工作流枚举类：
/**
* 工作流枚举类
* @author zhipeng.zhang
*/public enum BpmsActivityTypeEnum {
START_EVENT("startEvent", "开始事件"),
END_EVENT("endEvent", "结束事件"),
USER_TASK("userTask", "用户任务"),
EXCLUSIVE_GATEWAY("exclusiveGateway", "排他网关"),
PARALLEL_GATEWAY("parallelGateway", "并行网关"),
INCLUSIVE_GATEWAY("inclusiveGateway", "包含网关");
private String type; private String name;
private BpmsActivityTypeEnum(String type, String name) { this.type = type; this.name = name;
}
public String getType() { return type;
} public void setType(String type) { this.type = type;
} public String getName() { return name;
} public void setName(String name) { this.name = name;
}
}
浏览器直接发送以下格式请求，就可以查看实时流程图：
# traceprocess 后面追加流程IDhttp://localhost:8080/traceprocess/20190214