本文實例展示了Activiti流程圖查看的實現方法,具體步驟如下所示:
1、測試用例查看圖片代碼如下:
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public void viewImage() throws Exception { // 創建倉庫服務對對象 RepositoryService repositoryService = processEngine.getRepositoryService(); // 從倉庫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); // 通過部署ID和文件名稱得到文件的輸入流 InputStream in = repositoryService.getResourceAsStream(deploymentId, imageName); FileUtils.copyInputStreamToFile(in, f); } |
說明:
1) deploymentId為流程部署ID
2) resourceName為act_ge_bytearray表中NAME_列的值
3) 使用repositoryService的getDeploymentResourceNames方法可以獲取指定部署下得所有文件的名稱
4) 使用repositoryService的getResourceAsStream方法傳入部署ID和文件名稱可以獲取部署下指定名稱文件的輸入流
5) 最后的有關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貝
2、web項目中在流程定義頁面查看圖片:
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public String viewImage(){ InputStream in = repositoryService.getResourceAsStream.getImageStream(deploymentId,imageName); //此處方法實際項目應該放在service里面 HttpServletResponse resp = ServletActionContext.getResponse(); try { OutputStream out = resp.getOutputStream(); // 把圖片的輸入流程寫入resp的輸出流中 byte [] b = new byte [ 1024 ]; for ( int len = - 1 ; (len= in.read(b))!=- 1 ; ) { out.write(b, 0 , len); } // 關閉流 out.close(); in.close(); } catch (IOException e) { e.printStackTrace(); } return null ; } |
說明:
1) deploymentId為流程部署ID,imageName為圖片名稱
2) 因為是從流程定義列表頁面查看圖片,id和imageName可以從流程定義(ProcessDefinition)中獲取(String getDeploymentId();和 String getDiagramResourceName();)
3) web頁面標簽<a target="_blank" href="viewImage?deploymentId=1&imageName=imageName.png" rel="external nofollow" >查看流程圖</a>
3、web項目查看當前流程圖
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public String viewCurrentImage(){ ProcessDefinition pd = service.getProcessDefinitionByTaskId(taskId); // 1. 獲取流程部署ID putContext( "deploymentId" , pd.getDeploymentId()); // 2. 獲取流程圖片的名稱 putContext( "imageName" , pd.getDiagramResourceName()); // 3.獲取當前活動的坐標 Map<String,Object> currentActivityCoordinates =service.getCurrentActivityCoordinates(taskId); putContext( "acs" , currentActivityCoordinates); return "image" ; } |
其中service.getProcessDefinitionByTaskId(taskId);的代碼實現:
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public ProcessDefinition getProcessDefinitionByTaskId(String taskId) { // 1. 得到task Task task = taskService.createTaskQuery().taskId(taskId).singleResult(); // 2. 通過task對象的pdid獲取流程定義對象 ProcessDefinition pd = repositoryService.getProcessDefinition(task.getProcessDefinitionId()); return pd; } |
其中service.getCurrentActivityCoordinates(taskId);的代碼實現:
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public Map<String, Object> getCurrentActivityCoordinates(String taskId) { Map<String, Object> coordinates = new HashMap<String, Object>(); // 1. 獲取到當前活動的ID Task task = taskService.createTaskQuery().taskId(taskId).singleResult(); ProcessInstance pi = runtimeService.createProcessInstanceQuery().processInstanceId(task.getProcessInstanceId()).singleResult(); String currentActivitiId = pi.getActivityId(); // 2. 獲取到流程定義 ProcessDefinitionEntity pd = (ProcessDefinitionEntity) repositoryService.getProcessDefinition(task.getProcessDefinitionId()); // 3. 使用流程定義通過currentActivitiId得到活動對象 ActivityImpl activity = pd.findActivity(currentActivitiId); // 4. 獲取活動的坐標 coordinates.put( "x" , activity.getX()); coordinates.put( "y" , activity.getY()); coordinates.put( "width" , activity.getWidth()); coordinates.put( "height" , activity.getHeight()); return coordinates; } |
image頁面部分:
從個人任務列表頁面點擊<a target="_blank" href="/viewCurrentImage?taskId=1" rel="external nofollow" >查看當前流程圖</a>跳轉到下面頁面:
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<body> <!-- 1 .獲取到規則流程圖 這里是用的strust2的標簽得到上面上面放入值棧的值--> <img style= "position: absolute;top: 0px;left: 0px;" src= "viewImage?deploymentId=<s:property value='#deploymentId'/>&imageName=<s:property value='#imageName'/>" > <!-- 2 .根據當前活動的坐標,動態繪制DIV --> <div style= "position: absolute;border:1px solid red;top:<s:property value='#acs.y'/>px;left: <s:property value='#acs.x'/>px;width: <s:property value='#acs.width'/>px;height:<s:property value='#acs.height'/>px; " ></div> </body> |