1、测试用例查看图片
public void viewImage() throws Exception { // 创建仓库服务对对象 RepositoryService repositoryService = processEngine.getRepositoryService(); // 从仓库中找需要展示的文件 String deploymentId = "701"; List<String> names = repositoryService.getDeploymentResourceNames(deploymentId); String imageName = null; for (String name : names) { if(name.indexOf(".png")>=0){ imageName = name; } } if(imageName!=null){ // System.out.println(imageName); File f = new File("e:/"+ imageName); // 通过部署ID和文件名称得到文件的输入流 InputStream in = repositoryService.getResourceAsStream(deploymentId, imageName); FileUtils.copyInputStreamToFile(in, f); }
说明：
1) deploymentId为流程部署ID
2) resourceName为act_ge_bytearray表中NAME_列的值
3) 使用repositoryService的getDeploymentResourceNames方法可以获取指定部署下得所有文件的名称
4) 使用repositoryService的getResourceAsStream方法传入部署ID和文件名称可以获取部署下指定名称文件的输入流
5) 最后的有关IO流的操作，使用FileUtils工具的copyInputStreamToFile方法完成流程流程到文件的拷贝
2、在web项目中流程定义页面查看图片
public String viewImage(){ InputStream in = repositoryService.getResourceAsStream.getImageStream(deploymentId,imageName);//此处方法实际项目应该放在service里面 HttpServletResponse resp = ServletActionContext.getResponse(); try { OutputStream out = resp.getOutputStream(); // 把图片的输入流程写入resp的输出流中 byte[] b = new byte[1024]; for (int len = -1; (len= in.read(b))!=-1; ) { out.write(b, 0, len); } // 关闭流 out.close(); in.close(); } catch (IOException e) { e.printStackTrace(); } return null; }
说明：
1) deploymentId为流程部署ID，imageName为图片名称
2) 因为是从流程定义列表页面查看图片，id和imageName可以从流程定义（ProcessDefinition）中获取（String getDeploymentId();和 String getDiagramResourceName();）
3） web页面标签<a target="_blank" href="viewImage?deploymentId=1&imageName=imageName.png">查看流程图</a>
3、在web项目任务列表页面查看当前流程图（显示活动节点）
public String viewCurrentImage(){ ProcessDefinition pd = service.getProcessDefinitionByTaskId(taskId); // 1. 获取流程部署ID putContext("deploymentId", pd.getDeploymentId()); // 2. 获取流程图片的名称 putContext("imageName", pd.getDiagramResourceName()); // 3.获取当前活动的坐标 Map<String,Object> currentActivityCoordinates =service.getCurrentActivityCoordinates(taskId); putContext("acs", currentActivityCoordinates); return "image"; }
其中service.getProcessDefinitionByTaskId(taskId);的代码实现：
public ProcessDefinition getProcessDefinitionByTaskId(String taskId) { // 1. 得到task Task task = taskService.createTaskQuery().taskId(taskId).singleResult(); // 2. 通过task对象的pdid获取流程定义对象 ProcessDefinition pd = repositoryService.getProcessDefinition(task.getProcessDefinitionId()); return pd; }
其中service.getCurrentActivityCoordinates(taskId);的代码实现：
public Map<String, Object> getCurrentActivityCoordinates(String taskId) { Map<String, Object> coordinates = new HashMap<String, Object>(); // 1. 获取到当前活动的ID Task task = taskService.createTaskQuery().taskId(taskId).singleResult(); ProcessInstance pi = runtimeService.createProcessInstanceQuery().processInstanceId(task.getProcessInstanceId()).singleResult(); String currentActivitiId = pi.getActivityId(); // 2. 获取到流程定义 ProcessDefinitionEntity pd = (ProcessDefinitionEntity) repositoryService.getProcessDefinition(task.getProcessDefinitionId()); // 3. 使用流程定义通过currentActivitiId得到活动对象 ActivityImpl activity = pd.findActivity(currentActivitiId); // 4. 获取活动的坐标 coordinates.put("x", activity.getX()); coordinates.put("y", activity.getY()); coordinates.put("width", activity.getWidth()); coordinates.put("height", activity.getHeight()); //如果有多个流程活动节点（并发流程一般有多个活动节点）该方法应该返回一个list，代码应该使用下面的方法 // 得到流程执行对象 /* List<Execution> executions = runtimeService.createExecutionQuery() .processInstanceId(pi.getId()).list(); // 得到正在执行的Activity的Id List<String> activityIds = new ArrayList<String>(); for (Execution exe : executions) { List<String> ids = runtimeService.getActiveActivityIds(exe.getId()); activityIds.addAll(ids); } List<Map<String, Integer>> list = new ArrayList<Map<String, Integer>>(); for (String id : activityIds) { ActivityImpl activity1 = pd.findActivity(id); Map<String, Integer> map = new HashMap<String, Integer>(); map.put("x", activity1.getX()); map.put("y", activity1.getY()); map.put("width", activity1.getWidth()); map.put("height", activity1.getHeight()); list.add(map); }*/ return coordinates; }
image页面
从个人任务列表页面点击<a target="_blank" href="/viewCurrentImage?taskId=1">查看当前流程图</a>跳转到下面页面
<body> <!-- 1.获取到规则流程图 这里是用的strust2的标签得到上面上面放入值栈的值--> <img style="position: absolute;top: 0px;left: 0px;" src="viewImage?deploymentId=<s:property value='#deploymentId'/>&imageName=<s:property value='#imageName'/>"> <!-- 2.根据当前活动的坐标，动态绘制DIV --> <div style="position: absolute;border:1px solid red;top:<s:property value='#acs.y'/>px;left: <s:property value='#acs.x'/>px; <s:property value='#acs.width'/>px;height:<s:property value='#acs.height'/>px; "></div> </body>
4、另一种获取流程图的方法（并且显示活动节点）
这种方法比上面的简单，但是没有上面的灵活
public void test() throws Exception { ProcessInstance processInstance = runtimeService .startProcessInstanceByKey("process1"); taskService.complete(taskService.createTaskQuery().singleResult() .getId()); // 得到流程定义实体类 // ProcessDefinitionEntity pde = (ProcessDefinitionEntity) ((RepositoryServiceImpl) repositoryService) // .getDeployedProcessDefinition(processInstance // .getProcessDefinitionId()); ProcessDefinitionEntity pde = (ProcessDefinitionEntity)repositoryService.createProcessDefinitionQuery().processDefinitionId(processInstance.getProcessDefinitionId()).singleResult(); //得到流程执行对象 List<Execution> executions = runtimeService.createExecutionQuery() .processInstanceId(processInstance.getId()).list(); //得到正在执行的Activity的Id List<String> activityIds = new ArrayList<String>(); for (Execution exe : executions) { List<String> ids = runtimeService.getActiveActivityIds(exe.getId()); activityIds.addAll(ids); } InputStream in = ProcessDiagramGenerator.generateDiagram(pde, "png", activityIds); FileOutputStream out = new FileOutputStream("f:\watch.png"); FileCopyUtils.copy(in, out); }