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);
}
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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 ;
}
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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" ;
}
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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;
}
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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;
}
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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>
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