【应用篇】Activiti显示器（抽象）简单的应用程序和服务的颗粒结合（两）

Activiti简单的应用程序，业务颗粒与工作流程结合。让流程带动业务颗粒运行的过程。此次的监听我们应用抽象的监听来实现，也就是说全部的普通业务类均应用此抽象监听，而不须要每个类一个监听的来操作。

 

新建两个普通类：

package com.tgb.itoo.activiti.controller;

public class milaoshi {
	public static void SayHello(){
		System.out.println("milaoshi--sayHello--");
	}
/*	public static void SayHi(){
		System.out.println("milaoshi--sayHi--");
	}*/
}

package com.tgb.itoo.activiti.controller;

public class tanghuan {
	public static void SayHello(){
		System.out.println("tanghuan--sayHello--");
	}
	public static void SayHi(){
		System.out.println("tanghuan--sayHi--");
	}
}

抽象监听类：

package com.tgb.itoo.activiti.controller;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;

import org.activiti.engine.delegate.DelegateTask;
import org.activiti.engine.delegate.TaskListener;

public class CommonDelegate implements TaskListener{

	static Map<Object,Object> map;

	public CommonDelegate(){}
	public CommonDelegate(Map<Object,Object> map){
		this.map=map;
	}
		
	@Override
	public void notify(DelegateTask delegateTask) {
			
		Object obj=map.get("object");
		Class clazz=obj.getClass();
		Method[] methods=clazz.getDeclaredMethods();
		for(int i=0;i<methods.length;i++ ){			 					
			try {				
				
				Method beforMehod = clazz.getMethod(methods[i].getName());
		        beforMehod.invoke(obj);
				
			} catch (NoSuchMethodException | SecurityException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			} catch (IllegalAccessException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (IllegalArgumentException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (InvocationTargetException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}

		}
	}
	
	
}

业务流程图 如图（tanghuan类和milaoshi类均绑定同一个监听）：



流程变量 如图（不允许如图，允许为${result}）：




终于生成的配置文件 例如以下：


<?xml version="1.0" encoding="UTF-8"?>
<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:activiti="http://activiti.org/bpmn" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:omgdc="http://www.omg.org/spec/DD/20100524/DC" xmlns:omgdi="http://www.omg.org/spec/DD/20100524/DI" typeLanguage="http://www.w3.org/2001/XMLSchema" expressionLanguage="http://www.w3.org/1999/XPath" targetNamespace="http://www.activiti.org/test">
  <process id="myProcess" name="My process" isExecutable="true">
    <startEvent id="startevent1" name="Start"></startEvent>
    <userTask id="usertask1" name="tanghuan">
      <extensionElements>
        <activiti:taskListener event="create" class="com.tgb.itoo.activiti.controller.CommonDelegate"></activiti:taskListener>
      </extensionElements>
    </userTask>
    <sequenceFlow id="flow1" sourceRef="startevent1" targetRef="usertask1"></sequenceFlow>
    <exclusiveGateway id="exclusivegateway1" name="Exclusive Gateway"></exclusiveGateway>
    <sequenceFlow id="flow2" sourceRef="usertask1" targetRef="exclusivegateway1"></sequenceFlow>
    <userTask id="usertask2" name="milaoshi">
      <extensionElements>
        <activiti:taskListener event="create" class="com.tgb.itoo.activiti.controller.CommonDelegate"></activiti:taskListener>
      </extensionElements>
    </userTask>
    <sequenceFlow id="flow3" name="允许" sourceRef="exclusivegateway1" targetRef="usertask2">
      <conditionExpression xsi:type="tFormalExpression"><![CDATA[${result}]]></conditionExpression>
    </sequenceFlow>
    <endEvent id="endevent1" name="End"></endEvent>
    <sequenceFlow id="flow4" sourceRef="usertask2" targetRef="endevent1"></sequenceFlow>
    <sequenceFlow id="flow5" name="不允许" sourceRef="exclusivegateway1" targetRef="endevent1">
      <conditionExpression xsi:type="tFormalExpression"><![CDATA[${!result}]]></conditionExpression>
    </sequenceFlow>
  </process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_myProcess">
    <bpmndi:BPMNPlane bpmnElement="myProcess" id="BPMNPlane_myProcess">
      <bpmndi:BPMNShape bpmnElement="startevent1" id="BPMNShape_startevent1">
        <omgdc:Bounds height="35.0" width="35.0" x="139.0" y="102.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="usertask1" id="BPMNShape_usertask1">
        <omgdc:Bounds height="55.0" width="105.0" x="219.0" y="92.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="exclusivegateway1" id="BPMNShape_exclusivegateway1">
        <omgdc:Bounds height="40.0" width="40.0" x="369.0" y="100.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="usertask2" id="BPMNShape_usertask2">
        <omgdc:Bounds height="55.0" width="105.0" x="454.0" y="93.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="endevent1" id="BPMNShape_endevent1">
        <omgdc:Bounds height="35.0" width="35.0" x="489.0" y="222.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="flow1" id="BPMNEdge_flow1">
        <omgdi:waypoint x="174.0" y="119.0"></omgdi:waypoint>
        <omgdi:waypoint x="219.0" y="119.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow2" id="BPMNEdge_flow2">
        <omgdi:waypoint x="324.0" y="119.0"></omgdi:waypoint>
        <omgdi:waypoint x="369.0" y="120.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow3" id="BPMNEdge_flow3">
        <omgdi:waypoint x="409.0" y="120.0"></omgdi:waypoint>
        <omgdi:waypoint x="454.0" y="120.0"></omgdi:waypoint>
        <bpmndi:BPMNLabel>
          <omgdc:Bounds height="14.0" width="100.0" x="419.0" y="120.0"></omgdc:Bounds>
        </bpmndi:BPMNLabel>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow4" id="BPMNEdge_flow4">
        <omgdi:waypoint x="506.0" y="148.0"></omgdi:waypoint>
        <omgdi:waypoint x="506.0" y="222.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow5" id="BPMNEdge_flow5">
        <omgdi:waypoint x="389.0" y="140.0"></omgdi:waypoint>
        <omgdi:waypoint x="389.0" y="239.0"></omgdi:waypoint>
        <omgdi:waypoint x="489.0" y="239.0"></omgdi:waypoint>
        <bpmndi:BPMNLabel>
          <omgdc:Bounds height="14.0" width="100.0" x="399.0" y="201.0"></omgdc:Bounds>
        </bpmndi:BPMNLabel>
      </bpmndi:BPMNEdge>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</definitions>

启动流程相应的代码：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;

import org.activiti.engine.ProcessEngine;
import org.activiti.engine.ProcessEngineConfiguration;
import org.activiti.engine.RepositoryService;
import org.activiti.engine.RuntimeService;
import org.activiti.engine.TaskService;
import org.activiti.engine.runtime.ProcessInstance;
import org.activiti.engine.task.Task;

import com.tgb.itoo.activiti.controller.CommonDelegate;
import com.tgb.itoo.activiti.controller.milaoshi;
import com.tgb.itoo.activiti.controller.tanghuan;

public class MapDemo {

	private static String readDataFromConsole(String prompt) {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String str = null;
		try {
			System.out.print(prompt);
			str = br.readLine();

		} catch (IOException e) {
			e.printStackTrace();
		}
		return str;
	}

	public static void main(String[] args) {

		String str = readDataFromConsole("Please input string：");
		System.out.println("The information from console： " + str);
		// 创建流程引擎
		ProcessEngineConfiguration processEngineConfiguration = ProcessEngineConfiguration
				.createStandaloneProcessEngineConfiguration();
		// 连接数据库的配置
		processEngineConfiguration.setJdbcDriver("com.mysql.jdbc.Driver");
		processEngineConfiguration
				.setJdbcUrl("jdbc:mysql://localhost:3306/activitiexam?
useUnicode=true&characterEncoding=utf8");
		processEngineConfiguration.setJdbcUsername("root");
		processEngineConfiguration.setJdbcPassword("root");
		ProcessEngine processEngine = processEngineConfiguration
				.buildProcessEngine();

		System.out.println(processEngine);
		// 获取流程存储服务组件
		RepositoryService repositoryService = processEngine
				.getRepositoryService();

		// 获取运行时服务组件
		RuntimeService runtimeService = processEngine.getRuntimeService();

		// 获取流程任务组件
		TaskService taskService = processEngine.getTaskService();

		// 1、部署流程文件
		repositoryService.createDeployment().name("MyProcess")
				.addClasspathResource("diagrams/" + str + ".bpmn").deploy();

		
		Map<Object,Object> map=new HashMap<Object,Object>();
		tanghuan th=new tanghuan();
		milaoshi mxj=new milaoshi();
		//向map里面扔对象
		map.put("object", th);
		/*map.put("milaoshi", mxj);*/			
		CommonDelegate common=new CommonDelegate(map);
		
		// 2、启动流程
		ProcessInstance processInstance = runtimeService
				.startProcessInstanceByKey("myProcess");
		String end="1";//processInstance.getId() != null
		while (end.equalsIgnoreCase("1")) {
			map.remove("object");
			map.put("object", mxj);
			// 3、查询第一个任务
			Task task = taskService.createTaskQuery()
					.processInstanceId(processInstance.getId()).singleResult();
			;			
							
			if (task != null) {
				System.out.println("============" + task.getId()
						+ "============" + task.getName() + "============");
				str = readDataFromConsole("Please input result:");
				Map<String, Object> variables = new HashMap<String, Object>();
				Boolean result;
				if (str.equalsIgnoreCase("true")) {
					result = true;
				} else {
					result = false;

				}
				variables.put("result", result);
				taskService.complete(task.getId(), variables); // 完毕任务

			}else {
				end="0";
				System.out.println("任务已经完毕");
			} 

		}

	}

}

运行结果：




总结：

    以上这样的方式主要是应用了反射技术实现。我们在client动态的向监听内扔对象，依据扔的对象来去运行相应的方法，降低了我们编写监听的个数。

 


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原文地址：https://www.cnblogs.com/mfrbuaa/p/4741991.html