在上一節(jié)中說到：

Set<Transition> list = instance.getRootToken().getAvailableTransitions();

適合于從開始節(jié)點往下選擇流向，但是如果當前節(jié)點不是開始節(jié)點時且流程中有fork節(jié)點時，該方法就不一定行，原因如下：

當流程走到fork節(jié)點時，rootToken是指向fork節(jié)點的，用之前的方法運行得到如下：

當前節(jié)點可以選擇的流轉(zhuǎn)方向有：
流向王五
流向李四

而此時流程真正已經(jīng)流轉(zhuǎn)到了李四審批和王五審批，顯然他們的可選流轉(zhuǎn)方向，不是上面兩個。

?

所以改為如下使用方法：

//從中間的TaskNode節(jié)點出發(fā)如何得到下一步可選路徑列表
??? @SuppressWarnings("unchecked")
??? @Test
??? public void searchNextTransitionsFromTaskNodeTest(){
??? ???
??? ??? JbpmContext context = null;
??? ???
??? ??? ?try {
??? ??? ??? ?
??? ??? ??? //默認從classpath中查找名為hibernate.cfg.xml的配置文件
??? ??? ??? JbpmConfiguration configuration = JbpmConfiguration.getInstance();
??? ??? ???
??? ??? ??? //JbpmContext是對hibernate session的封裝，提供了對JBPM相關對象的持久化功能
??? ??? ??? context = configuration.createJbpmContext();
??? ??? ???
??? ??? ??? //已知公文Id=7和用戶ID
??? ??? ??? String actorId = "李四";
??? ??? ??? Long docId = 7l;
??? ??? ??? List<TaskInstance> list = context.getTaskMgmtSession().findTaskInstances(actorId);
??? ??? ??? for (TaskInstance taskInstance : list) {
??? ??? ??? ??? Long documentId = (Long) taskInstance.getContextInstance().getVariable("documentId");
??? ??? ??? ???
??? ??? ??? ??? if (docId.equals(documentId)) {
??? ??? ??? ??? ???
??? ??? ??? ??? ??? List<Transition> nextTrans = taskInstance.getAvailableTransitions();
??? ??? ??? ??? ??? System.out.println("當前節(jié)點可以選擇的流轉(zhuǎn)方向有：");
??? ??? ??? ??? ??? for (Transition transition : nextTrans) {
??? ??? ??? ??? ??? ??? System.out.println(transition.getName());
??? ??? ??? ??? ??? ??? //taskInstance.end(transition.getName());
??? ??? ??? ??? ??? }
??? ??? ??? ??? }
??? ??? ??? }
??? ??? ???
??? ??? ???
??? ??? ???
??? ??? } catch (RuntimeException e) {
??? ??? ??? e.printStackTrace();
??? ??? }finally{
??? ??? ??? context.close();
??? ??? }
??? ???
??? }

十五、從中間的TaskNode節(jié)點出發(fā)如何得到下一步可選路徑列表