activiti流程图动态创建

最近公司项目用到工作流，所为选了比较简单的activiti工作流框架来用。其实网上对activiti的教程讲解也有，但是感觉都不够深入，希望大神们出多点教程，让我们菜鸟学习一下。

具体代码：

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.activiti.bpmn.BpmnAutoLayout;
import org.activiti.bpmn.model.BpmnModel;
import org.activiti.bpmn.model.EndEvent;
import org.activiti.bpmn.model.ExclusiveGateway;
import org.activiti.bpmn.model.Process;
import org.activiti.bpmn.model.SequenceFlow;
import org.activiti.bpmn.model.StartEvent;
import org.activiti.bpmn.model.UserTask;
import org.activiti.engine.ProcessEngine;
import org.activiti.engine.ProcessEngineConfiguration;
import org.activiti.engine.repository.Deployment;
import org.activiti.engine.runtime.ProcessInstance;
import org.activiti.engine.task.Task;
import org.apache.commons.io.FileUtils;
import org.apache.commons.lang.StringUtils;
import org.junit.Assert;

/**
 * 
 */

/**  
 * @ClassName: ActivitiTest01
 * @Description: TODO(activiti 工作流程图自动生成)
 * @author liang
 * @date 2016年4月20日 上午8:32:56
 *
 */
public class ActivitiTest01 {

	public static void main(String[] args) {
		try {
			test01();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	public static void test01() throws IOException {
		System.out.println(".........start...");
		ProcessEngine processEngine=getProcessEngine();
		
		// 1. Build up the model from scratch
		BpmnModel model = new BpmnModel();  
		Process process=new Process();
		model.addProcess(process); 
		final String PROCESSID ="process01";
		final String PROCESSNAME ="测试01";
		process.setId(PROCESSID); 
		process.setName(PROCESSNAME);
		
		process.addFlowElement(createStartEvent());  
		process.addFlowElement(createUserTask("task1", "节点01", "candidateGroup1")); 
		process.addFlowElement(createExclusiveGateway("createExclusiveGateway1")); 
		process.addFlowElement(createUserTask("task2", "节点02", "candidateGroup2")); 
		process.addFlowElement(createExclusiveGateway("createExclusiveGateway2")); 
		process.addFlowElement(createUserTask("task3", "节点03", "candidateGroup3")); 
		process.addFlowElement(createExclusiveGateway("createExclusiveGateway3")); 
		process.addFlowElement(createUserTask("task4", "节点04", "candidateGroup4"));
		process.addFlowElement(createEndEvent());  
		
		process.addFlowElement(createSequenceFlow("startEvent", "task1", "", "")); 
		process.addFlowElement(createSequenceFlow("task1", "task2", "", "")); 
		process.addFlowElement(createSequenceFlow("task2", "createExclusiveGateway1", "", ""));
		process.addFlowElement(createSequenceFlow("createExclusiveGateway1", "task1", "不通过", "${pass=='2'}"));
		process.addFlowElement(createSequenceFlow("createExclusiveGateway1", "task3", "通过", "${pass=='1'}")); 
		process.addFlowElement(createSequenceFlow("task3", "createExclusiveGateway2", "", ""));
		process.addFlowElement(createSequenceFlow("createExclusiveGateway2", "task2", "不通过", "${pass=='2'}"));
		process.addFlowElement(createSequenceFlow("createExclusiveGateway2", "task4", "通过", "${pass=='1'}"));
		process.addFlowElement(createSequenceFlow("task4", "createExclusiveGateway3", "", ""));
		process.addFlowElement(createSequenceFlow("createExclusiveGateway3", "task3", "不通过", "${pass=='2'}"));
		process.addFlowElement(createSequenceFlow("createExclusiveGateway3", "endEvent", "通过", "${pass=='1'}"));
		
		// 2. Generate graphical information  
		new BpmnAutoLayout(model).execute();
		
		// 3. Deploy the process to the engine  
		Deployment deployment = processEngine.getRepositoryService().createDeployment().addBpmnModel(PROCESSID+".bpmn", model).name(PROCESSID+"_deployment").deploy();  
		   
		// 4. Start a process instance  
		ProcessInstance processInstance = processEngine.getRuntimeService().startProcessInstanceByKey(PROCESSID); 
		
		// 5. Check if task is available  
		List tasks = processEngine.getTaskService().createTaskQuery().processInstanceId(processInstance.getId()).list();
		Assert.assertEquals(1, tasks.size()); 		
		
		// 6. Save process diagram to a file    
		InputStream processDiagram = processEngine.getRepositoryService().getProcessDiagram(processInstance.getProcessDefinitionId());  
		FileUtils.copyInputStreamToFile(processDiagram, new File("/deployments/"+PROCESSID+".png"));  
		   
		// 7. Save resulting BPMN xml to a file  
		InputStream processBpmn = processEngine.getRepositoryService().getResourceAsStream(deployment.getId(), PROCESSID+".bpmn");  
		FileUtils.copyInputStreamToFile(processBpmn,new File("/deployments/"+PROCESSID+".bpmn"));
		
		System.out.println(".........end...");
	}
	
	protected static ProcessEngine getProcessEngine(){
		ProcessEngine processEngine=ProcessEngineConfiguration.createStandaloneInMemProcessEngineConfiguration()
				.setDatabaseSchemaUpdate(ProcessEngineConfiguration.DB_SCHEMA_UPDATE_FALSE)
				.setJdbcUrl("jdbc:mysql://127.0.0.1:3306/activitiDB")
				.setJdbcDriver("com.mysql.jdbc.Driver")
				.setJdbcUsername("root")
				.setJdbcPassword("123456")
				.setDatabaseSchemaUpdate("true")
				.setJobExecutorActivate(false)
				.buildProcessEngine();
		return processEngine;
				
	}

	/*任务节点*/
	protected static UserTask createUserTask(String id, String name, String candidateGroup) {
		List candidateGroups=new ArrayList();
		candidateGroups.add(candidateGroup);
		UserTask userTask = new UserTask();
		userTask.setName(name);
		userTask.setId(id);
		userTask.setCandidateGroups(candidateGroups);
		return userTask;
	}

	/*连线*/
	protected static SequenceFlow createSequenceFlow(String from, String to,String name,String conditionExpression) {
		SequenceFlow flow = new SequenceFlow();
		flow.setSourceRef(from);
		flow.setTargetRef(to);
		flow.setName(name);
		if(StringUtils.isNotEmpty(conditionExpression)){
			flow.setConditionExpression(conditionExpression);
		}		
		return flow;
	}
	
	/*排他网关*/
	protected static ExclusiveGateway createExclusiveGateway(String id) {
		ExclusiveGateway exclusiveGateway = new ExclusiveGateway();
		exclusiveGateway.setId(id);
		return exclusiveGateway;
	}

	/*开始节点*/
	protected static StartEvent createStartEvent() {
		StartEvent startEvent = new StartEvent();
		startEvent.setId("startEvent");
		return startEvent;
	}

	/*结束节点*/
	protected static EndEvent createEndEvent() {
		EndEvent endEvent = new EndEvent();
		endEvent.setId("endEvent");
		return endEvent;
	}
	
}