標籤：style blog http color 使用 os strong io
1、測試案例查看圖片
public void viewImage() throws Exception { // 建立倉庫服務對對象 RepositoryService repositoryService = processEngine.getRepositoryService(); // 從倉庫中找需要展示的檔案 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和檔案名稱得到檔案的輸入資料流 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方法可以擷取指定部署下得所有檔案的名稱
4) 使用repositoryService的getResourceAsStream方法傳入部署ID和檔案名稱可以擷取部署下指定名稱檔案的輸入資料流
5) 最後的有關IO流的操作，使用FileUtils工具的copyInputStreamToFile方法完成流程流程到檔案的拷貝
2、web項目中在流程定義頁面查看圖片
public String viewImage(){ InputStream in = repositoryService.getResourceAsStream.getImageStream(deploymentId,imageName);//此處方法實際項目應該放在service裡面 HttpServletResponse resp = ServletActionContext.getResponse(); try { OutputStream out = resp.getOutputStream(); // 把圖片的輸入資料流程寫入resp的輸出資料流中 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）中擷取（String getDeploymentId();和 String getDiagramResourceName();）
3） web頁面標籤<a target="_blank" href="viewImage?deploymentId=1&imageName=imageName.png">查看流程圖</a>
3、web項目查看當前流程圖
public String viewCurrentImage(){ ProcessDefinition pd = service.getProcessDefinitionByTaskId(taskId); // 1. 擷取流程部署ID putContext("deploymentId", pd.getDeploymentId()); // 2. 擷取流程圖片的名稱 putContext("imageName", pd.getDiagramResourceName()); // 3.擷取當前活動的座標 Map<String,Object> currentActivityCoordinates =service.getCurrentActivityCoordinates(taskId); putContext("acs", currentActivityCoordinates); return "image"; }
其中service.getProcessDefinitionByTaskId(taskId);的代碼實現：
public ProcessDefinition getProcessDefinitionByTaskId(String taskId) { // 1. 得到task Task task = taskService.createTaskQuery().taskId(taskId).singleResult(); // 2. 通過task對象的pdid擷取流程定義對象 ProcessDefinition pd = repositoryService.getProcessDefinition(task.getProcessDefinitionId()); return pd; }
其中service.getCurrentActivityCoordinates(taskId);的代碼實現：
public Map<String, Object> getCurrentActivityCoordinates(String taskId) { Map<String, Object> coordinates = new HashMap<String, Object>(); // 1. 擷取到當前活動的ID Task task = taskService.createTaskQuery().taskId(taskId).singleResult(); ProcessInstance pi = runtimeService.createProcessInstanceQuery().processInstanceId(task.getProcessInstanceId()).singleResult(); String currentActivitiId = pi.getActivityId(); // 2. 擷取到流程定義 ProcessDefinitionEntity pd = (ProcessDefinitionEntity) repositoryService.getProcessDefinition(task.getProcessDefinitionId()); // 3. 使用流程定義通過currentActivitiId得到使用中的物件 ActivityImpl activity = pd.findActivity(currentActivitiId); // 4. 擷取活動的座標 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
從個人工作清單頁面點擊<a target="_blank" href="/viewCurrentImage?taskId=1">查看當前流程圖</a>跳轉到下面頁面
<body><!-- 1.擷取到規則流程圖 這裡是用的strust2的標籤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.根據當前活動的座標，動態繪製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>
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