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Activiti流程图查看实例

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:

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"; ListString 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:

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="viewImagedeploymentId=1imageName=imageName.png" rel="external nofollow" 查看流程图/a

3、web项目查看当前流程图

public String viewCurrentImage(){ProcessDefinition pd = service.getProcessDefinitionByTaskId(taskId);// 1. 获取流程部署IDputContext("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MapString,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taskTask 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 MapString, Object getCurrentActivityCoordinates(String taskId) {MapString, Object coordinates = new HashMapString, Object();// 1. 获取到当前活动的IDTask 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="/viewCurrentImagetaskId=1" rel="external nofollow" 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="viewImagedeploymentId=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