最近一直研究springboot，根据工作需求，工作流需要作为一个单独的微服务工程来提供给其他服务调用，现在简单的写下工作流（使用的activiti）微服务的搭建与简单使用

jdk：1.8

数据库：mysql  5.7

IDE：eclipse

springboot：1.5.8

activiti：6.0.0

1.新建空白的maven微服务架构

新建maven项目的流程不在阐述，这里添加上activiti、myslq连接的依赖，只贴主要代码
pox.xml 

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.xxx</groupId>
  <artifactId>xxx</artifactId>
  <version>0.0.1-SNAPSHOT</version>
   <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
    </properties>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.8.RELEASE</version>
    </parent>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.activiti</groupId>
            <artifactId>activiti-spring-boot-starter-basic</artifactId>
            <version>6.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>
确认服务是可用

2.连接服务名、服务端口、数据库配置

在resources目录下的application.properties（项目定位原因没有使用yaml，可根据自己项目使用） 
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/activity?characterEncoding=utf8&useSSL=true
spring.datasource.username=root
spring.datasource.password=root
spring.jpa.properties.hibernate.hbm2ddl.auto=update
spring.jpa.show-sql=true
server.port=8081
server.context-path=/activity
server.session.timeout=10
server.tomcat.uri-encoding=UTF-8
确认配置的数据库可用

3.main

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * Created by Guo on 2017/11/15.
 */
@SpringBootApplication
public class ActivityApp
{
    public static void main(String[] args)
    {
        SpringApplication.run(ActivityApp.class, args);
    }
}

4.service及实现

service: 
import org.activiti.engine.task.TaskQuery;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/activityService")
public interface ActivityConsumerService {
	/**
	 * 流程demo
	 * @return
	 */
	@RequestMapping(value="/startActivityDemo",method=RequestMethod.GET)
    public boolean startActivityDemo();
	
}
impl 
import java.util.HashMap;
import java.util.Map;

import org.activiti.engine.RuntimeService;
import org.activiti.engine.TaskService;
import org.activiti.engine.impl.persistence.entity.ExecutionEntity;
import org.activiti.engine.task.Task;
import org.activiti.engine.task.TaskQuery;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.hongguaninfo.activity.service.ActivityConsumerService;
@Service("activityService")
public class ActivityConsumerServiceImpl implements ActivityConsumerService {

	@Autowired
    private RuntimeService runtimeService;
	@Autowired
    private TaskService taskService;
	
	@Override
	public boolean startActivityDemo() {
		System.out.println("method startActivityDemo begin....");
        Map<String,Object> map = new HashMap<String,Object>();
        map.put("apply","zhangsan");
        map.put("approve","lisi");
//流程启动
        ExecutionEntity pi1 = (ExecutionEntity) runtimeService.startProcessInstanceByKey("leave",map);
        String processId = pi1.getId();
        String taskId = pi1.getTasks().get(0).getId();
        taskService.complete(taskId, map);//完成第一步申请
        
        Task task = taskService.createTaskQuery().processInstanceId(processId).singleResult();
        String taskId2 = task.getId();
        map.put("pass", false);
        taskService.complete(taskId2, map);//驳回申请
        System.out.println("method startActivityDemo end....");
        return false;
	}
}

5.bpmn

在resources目录下新建文件夹：processes，并在processes创建一个新的bpmn文件，如图

文件内容： 
<?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" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" xmlns:di="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/testm1510735932336" id="m1510735932336" name="">
  <process id="leave" isExecutable="true" isClosed="false" processType="None">
    <startEvent id="_2" name="StartEvent"></startEvent>
    <endEvent id="_3" name="EndEvent"></endEvent>
    <userTask id="approve" name="经理审批" activiti:assignee="${approve}"></userTask>
    <exclusiveGateway id="_5" name="ExclusiveGateway"></exclusiveGateway>
    <sequenceFlow id="_6" sourceRef="approve" targetRef="_5"></sequenceFlow>
    <sequenceFlow id="_7" name="通过" sourceRef="_5" targetRef="_3">
      <conditionExpression xsi:type="tFormalExpression"><![CDATA[${pass}]]></conditionExpression>
    </sequenceFlow>
    <userTask id="application" name="提交申请" activiti:assignee="${apply}"></userTask>
    <sequenceFlow id="_9" sourceRef="_2" targetRef="application"></sequenceFlow>
    <sequenceFlow id="_10" sourceRef="application" targetRef="approve"></sequenceFlow>
    <userTask id="modify" name="修改申请" activiti:assignee="${apply}"></userTask>
    <sequenceFlow id="_12" name="不通过" sourceRef="_5" targetRef="modify">
      <conditionExpression xsi:type="tFormalExpression"><![CDATA[${!pass}]]></conditionExpression>
    </sequenceFlow>
    <sequenceFlow id="_13" sourceRef="modify" targetRef="approve"></sequenceFlow>
  </process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_leave">
    <bpmndi:BPMNPlane bpmnElement="leave" id="BPMNPlane_leave">
      <bpmndi:BPMNShape bpmnElement="_2" id="BPMNShape__2">
        <omgdc:Bounds height="35.0" width="35.0" x="15.0" y="60.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="_3" id="BPMNShape__3">
        <omgdc:Bounds height="35.0" width="35.0" x="630.0" y="63.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="approve" id="BPMNShape_approve">
        <omgdc:Bounds height="55.0" width="85.0" x="315.0" y="50.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="_5" id="BPMNShape__5">
        <omgdc:Bounds height="40.0" width="40.0" x="505.0" y="60.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="application" id="BPMNShape_application">
        <omgdc:Bounds height="55.0" width="85.0" x="135.0" y="50.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="modify" id="BPMNShape_modify">
        <omgdc:Bounds height="55.0" width="85.0" x="315.0" y="150.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="_6" id="BPMNEdge__6">
        <omgdi:waypoint x="400.0" y="77.0"></omgdi:waypoint>
        <omgdi:waypoint x="505.0" y="80.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="_7" id="BPMNEdge__7">
        <omgdi:waypoint x="545.0" y="80.0"></omgdi:waypoint>
        <omgdi:waypoint x="630.0" y="80.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="_9" id="BPMNEdge__9">
        <omgdi:waypoint x="50.0" y="77.0"></omgdi:waypoint>
        <omgdi:waypoint x="135.0" y="77.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="_10" id="BPMNEdge__10">
        <omgdi:waypoint x="220.0" y="77.0"></omgdi:waypoint>
        <omgdi:waypoint x="315.0" y="77.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="_12" id="BPMNEdge__12">
        <omgdi:waypoint x="525.0" y="100.0"></omgdi:waypoint>
        <omgdi:waypoint x="525.0" y="177.0"></omgdi:waypoint>
        <omgdi:waypoint x="400.0" y="177.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="_13" id="BPMNEdge__13">
        <omgdi:waypoint x="357.0" y="150.0"></omgdi:waypoint>
        <omgdi:waypoint x="357.0" y="105.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</definitions>
需要认知的问题：.项目启动的时候，activiti会自动在mysql中创建activiti相关表，不用像oracle那样需要手动去创建

6.验证

启动项目前，连接数据库，查看需要连接数据库中没有表，启动项目完成后，刷新数据库，activiti已经创建相关表，打开act_re_procdef表，流程数据已经存在，即流程已经部署成功。
用浏览器访问地址：http://127.0.0.1:8081/activity/activityService/startActivityDemo
打印了预计的日志，没有报错信息，查看数据库中的act_ru_task表，发现刚才执行形成的数据，项目成功。
PS:只是简单的微服务，没有去写注册服务、网关配置、熔断机制等等，仅用于activiti与springboot的结合
=========================后续==========================
1.在项目单独作为一个引擎，本身不部署流程的时候，如果resources目录没有“processes”目录，启动项目报错--找不到processes目录。需要在配置文件中添加一下内容： 
spring: 
  activiti: 
####校验流程文件，默认校验resources下的processes文件夹里的流程文件
    check-process-definitions: false
即启动项目，不去校验processes。


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