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、在web项目中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="viewImage?deploymentId=1&imageName=imageName.png">查看流程图</a>
3、在web项目任务列表页面查看当前流程图（显示活动节点）
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());
//如果有多个流程活动节点（并发流程一般有多个活动节点）该方法应该返回一个list，代码应该使用下面的方法
// 得到流程执行对象
/* List<Execution> executions = runtimeService.createExecutionQuery()
.processInstanceId(pi.getId()).list();
// 得到正在执行的Activity的Id
List<String> activityIds = new ArrayList<String>();
for (Execution exe : executions) {
List<String> ids = runtimeService.getActiveActivityIds(exe.getId());
activityIds.addAll(ids);
}
List<Map<String, Integer>> list = new ArrayList<Map<String, Integer>>();
for (String id : activityIds) {
ActivityImpl activity1 = pd.findActivity(id);
Map<String, Integer> map = new HashMap<String, Integer>();
map.put("x", activity1.getX());
map.put("y", activity1.getY());
map.put("width", activity1.getWidth());
map.put("height", activity1.getHeight());
list.add(map);
}*/
return coordinates;
}
image页面
从个人任务列表页面点击<a target="_blank" href="/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='#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>
4、另一种获取流程图的方法（并且显示活动节点）
这种方法比上面的简单，但是没有上面的灵活
public void test() throws Exception {
ProcessInstance processInstance = runtimeService
.startProcessInstanceByKey("process1");
taskService.complete(taskService.createTaskQuery().singleResult()
.getId());
// 得到流程定义实体类
// ProcessDefinitionEntity pde = (ProcessDefinitionEntity) ((RepositoryServiceImpl) repositoryService)
// .getDeployedProcessDefinition(processInstance
// .getProcessDefinitionId());
ProcessDefinitionEntity pde = (ProcessDefinitionEntity)repositoryService.createProcessDefinitionQuery().processDefinitionId(processInstance.getProcessDefinitionId()).singleResult();
//得到流程执行对象
List<Execution> executions = runtimeService.createExecutionQuery()
.processInstanceId(processInstance.getId()).list();
//得到正在执行的Activity的Id
List<String> activityIds = new ArrayList<String>();
for (Execution exe : executions) {
List<String> ids = runtimeService.getActiveActivityIds(exe.getId());
activityIds.addAll(ids);
}
InputStream in = ProcessDiagramGenerator.generateDiagram(pde, "png",
activityIds);
FileOutputStream out = new FileOutputStream("f:\\watch.png");
FileCopyUtils.copy(in, out);
}