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Activiti流程图查看

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、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="http://www.mamicode.com/viewImage?deploymentId=1&imageName=imageName.png">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());        return coordinates;    }

  image页面

  从个人任务列表页面点击<a target="_blank" href="http://www.mamicode.com/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=http://www.mamicode.com/‘#deploymentId‘/>&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=http://www.mamicode.com/‘#acs.y‘/>px;left: px;width: px;height:px;"></div></body>