本文实例展示了Activiti流程图查看的实现方法,具体步骤如下所示:
1、测试用例查看图片代码如下:
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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、web项目中在流程定义页面查看图片:
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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" rel="external nofollow" >查看流程图</a>
3、web项目查看当前流程图
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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:
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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:
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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()); return coordinates; } |
image页面部分:
从个人任务列表页面点击<a target="_blank" href="/viewCurrentImage?taskId=1" rel="external nofollow" >查看当前流程图</a>跳转到下面页面:
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<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;width: <s:property value='#acs.width'/>px;height:<s:property value='#acs.height'/>px; " ></div> </body> |