JBPM工作流

接口
ProcessEngine			工作流引擎   可以通过spring和 Configuration.getProcessEngine();
ExecutionService		执行				
ProcessInstance			流程实例			
ProcessDefinition		流程定义
TaskService			任务
IdentityService			自动增长
HistoryService			历史记录
ManagementService		管理
RepositoryService		仓库


方法:
1.ProcessEngine      
	processEngine.setAuthenticatedUserId(String );
	processEngine.setHibernateSession(Object);
	processEngine.setJdbcConnection(Connection);

	Object get(String);
	ExecutionService getExecutionService();
	HistoryService	getHistoryService();
	IdentityService getIdentityService();
	ManagementService getManagementService();
	RepositoryService getRepositoryService();
	TaskService getTaskService();


1.查询流程实例:new Instance
List<ProcessInstance>  instances = executionService.createProcessInstanceQuery().list();

2.查询流程进度
	1)得到当前流程中相匹配的活动 (可以得到活动的长高宽..)
	<%String id = request.getParameter("id");
	ProcessEngine processEngine = Configuration.getProcessEngine();
	RepositoryService repositoryService = processEngine.getRepositoryService();
	ExecutionService executionService = processEngine.getExecutionService();
	ProcessInstance processInstance = executionService.findProcessInstanceById(id);
	Set<String> activityNames = processInstance.findActiveActivityNames();
	ActivityCoordinates ac = repositoryService.getActivityCoordinates(processInstance.getProcessDefinitionId(),activityNames.iterator().next());%>
	<div style="position:absolute;border:1px solid red;left:<%=ac.getX()%>px;top:<%=ac.getY()%>px;width:<%=ac.getWidth()%>px;height:<%=ac.getHeight()%>px;"></div>

	2)生成图片
	<img src="Definition_definitionImage.action?id=<%=id %>" style="position:absolute;left:0px;top:0px;" align="middle">

    	RepositoryService repositoryService = this.getProcessEngine().getRepositoryService();    	
    	ExecutionService executionService = this.getProcessEngine().getExecutionService();    	
    	String id = this.getRequest().getParameter("id");    	
    	ProcessInstance processInstance = executionService.findProcessInstanceById(id);    	
    	String processDefinitionId = processInstance .getProcessDefinitionId();
    	 // processDefinitionId 方法表示去 JBPM4_DEPLOYPROP 中按 processDefinitionId和 STRINGVAL_ 字段去找 DEPLOYMENT
    	 // 简单说就是通过 流程部署的小项id 去找 流程对象
    	ProcessDefinition processDefinition = repositoryService.createProcessDefinitionQuery()
			.processDefinitionId(processDefinitionId).uniqueResult();
    	System.out.println(processDefinition.getImageResourceName()+"-----"+processDefinition.getDeploymentId());    	
    	// 图片输入流  
    	InputStream inputStream = null;  
    	// 如果是上传的是 xml 文件 , processDefinition.getImageResourceName() 就会是null .
    	if(processDefinition.getImageResourceName()==null){
    		String did = processDefinition.getDeploymentId();
    		  DefinitionImage definitionImage = this.getJbpmService().findImageByDefinitionId(did);  //自己写的Service不是JBPM的API
    		  if(definitionImage!=null){
    			  //  通过 这个 xml 的 流程id 找到它在数据库 definitionImage表中的记录 ,中间也有他的 图片名称 
    			  // 从而构造出 inputStream 对象 
    			  String uploadRoot = super.getRequest().getRealPath("/upload/jpdl/"+definitionImage.getImageName());
    			 try {
					inputStream = new FileInputStream(uploadRoot);
				} catch (FileNotFoundException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
    		  }

    	}else{
    	    // 从数据库读到的输入流 . 
        	inputStream = repositoryService.getResourceAsStream(processDefinition.getDeploymentId(),processDefinition.getImageResourceName());
    	}
    	byte[] b = new byte[1024];
    	int len = -1;
    	try {
			ServletOutputStream sos = this.getResponse().getOutputStream();
			while ((len = inputStream.read(b, 0, 1024)) != -1) {
				sos.write(b, 0, len);
			}
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
		}

3.查询流程定义 (相当于Class,流程实例相当于new 的类)
List<ProcessDefinition> definitionList =  this.getProcessEngine().getRepositoryService().createProcessDefinitionQuery().list();

4.开启流程，已经有动态表单了。
				String id=reuqest.getParameter("id");  //得到流程定义ID
				// 得到当前用户 
				UserInfo userInfo = super.getLoginUser();
				//为了方便测试 , 先写死 
				Map<String, Object> map = new HashMap<String, Object>();
				map.put(Definition_Action.USER_INFO, userInfo.getUserId());
				// 为什么这里不能有多个参数
			 	map.put(Definition_Action.FORM_ID, formId);  // form 表单 id 
				// 得到专门操作流程实例的 执行对象 
				System.out.println(map);
				ExecutionService executionService = this.getProcessEngine()
						.getExecutionService();

				// 开启实例  ,  ProcessInstance 对象好像对应的就是 ExecutionService 的表  
				ProcessInstance pi = executionService.startProcessInstanceById(id,map);

5.上传流程定义
	/*
	 * 上传方法 (non-Javadoc) , 方法名写错了 , 应该是 uploadDefinition 
	 * 难点
	 * 1. 上传的 zip 格式就很好处理
	 * 2. 上传的是 xml , 要复杂一点 , 因为 xml 文件是不带 png 流程图的 , 这样的话就实现不了流程跟踪了 , 
	  * 所有要去网上找了个 根据  xml 生成流程图 png 的工具 (这个方法中没实现 ) ,
	  * 3.  把 xml的 流程id 和 生成的流程图名写到数据库中,当然前提是,把 xml要上传到 tomcat 先. 
	*/
	File src = this.getUpload();
    	// 得到  "知识库" service 
    	RepositoryService rService = this.getProcessEngine().getRepositoryService(); 

    	String fileName = this.getUploadFileName();
    	String ext = fileName.substring(fileName.lastIndexOf(".")+1,fileName.length());

    	if(ext.equals("zip")){
	    	try {
				ZipInputStream zis = new ZipInputStream(new FileInputStream(src));
				rService.createDeployment().addResourcesFromZipInputStream(zis)
						.deploy();
			} catch (Exception e) {
				// TODO: handle exception
				e.printStackTrace();
			}
    	}else if(ext.equals("xml")){
		//如果上传成功后就要放到自己的表中保存起来。
		//流程定义对象 id 
		String definitionId = rService.createDeployment().addResourceFromInputStream(this.getUploadFileName(),new FileInputStream(src)).deploy();
	}

6.删除流程定义
	RepositoryService repositoryService = this.getProcessEngine().getRepositoryService();
	//删除要流程部署ID
	repositoryService.deleteDeploymentCascade("depolymentId");

7.查询我的任务
	TaskService taskService = this.getProcessEngine().getTaskService();
	//得到用户任务 
	List<Task> taskList = taskService.findPersonalTasks(userInfo.getUserId()); 
	//SQL:select * from JBPM4_TASK where assignee=?; 

	// 得到任务变量 formId   ？？ var这里是不是在上面(开启流程)已经定义好了的。
        Object formId = taskService.getVariable(task.getId(), Definition_Action.FORM_ID);