文章目录

一、什么是flowable？
- 官方文档：
二、技术选型
三、Flowable与springBoot项目整合
- 3.1. 添加依赖
- 3.2. yml 文件配置
- 3.3. 创建数据库
- 3.4. 定义流程文件
- 3.5. 测试controller
- 3.6. 图片乱码处理
四、启动项目，初始化表结构
五、测试验证
- 5.1. 创建一个流程：
- 5.2. 查询待办列表:
- 5.3. 同意：
- 5.4. 生成流程图：
- 项目源码地址：

一、什么是flowable？

对于flowable是什么以及关于此框架的具体信息可以参看此项目的。

官方文档：

https://www.flowable.org/docs/userguide/index.html

官网对于此项目如何使用有非常详细的描述，只是目前还没有对应的中文文档。

Flowable is a light-weight business process engine written in Java.这是官网文档对此框架的完美解释：Flowable是一个用java语言写的轻量级工作流引擎。

在简单了解flowable后与activiti框架相比的第一感觉就是开发方便快速，易与springBoot等各种框架快速整合。如果项目中需要快速实现一些工作流的相关功能那么用此框架是一个不错的选择。

二、技术选型

框架	版本
SpringBoot	2.1.5.RELEASE
flowable	6.4.0
mysql	8.0.11

三、Flowable与springBoot项目整合

3.1. 添加依赖

将flowable的依赖加入到POM中即可,flowable使用需要一个数据库，这里为了方便我选择mysql

   <!--springmvc启动器--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!--flowable工作流依赖--><dependency><groupId>org.flowable</groupId><artifactId>flowable-spring-boot-starter-basic</artifactId><version>6.4.0</version></dependency><!--mysql依赖--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.11</version></dependency>

3.2. yml 文件配置

server:port: 80
spring:datasource:url: jdbc:mysql://127.0.0.1:3306/flowable?autoReconnect=true&useUnicode=true&characterEncoding=utf8&useSSL=false&serverTimezone=CTT&nullCatalogMeansCurrent=trueusername: rootpassword: root
flowable:async-executor-activate: false

这样操作后，flowable与springBoot的整个就完成了！

然后就可以运行了，初次运行时flowable会将自动执行flowable中的初始化脚本完成工作流所需要的数据表的建立，如果指定的数据库中还未创建过flowable的相关数据表的话。

3.3. 创建数据库

在这里插入图片描述

3.4. 定义流程文件

ExpenseProcess.bpmn20.xml

<?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:flowable="http://flowable.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.flowable.org/processdef"><process id="Expense" name="ExpenseProcess" isExecutable="true"><documentation>报销流程</documentation><startEvent id="start" name="开始"></startEvent><userTask id="fillTask" name="出差报销" flowable:assignee="${taskUser}"><extensionElements><modeler:initiator-can-complete xmlns:modeler="http://flowable.org/modeler"><![CDATA[false]]></modeler:initiator-can-complete></extensionElements></userTask><exclusiveGateway id="judgeTask"></exclusiveGateway><userTask id="directorTak" name="经理审批"><extensionElements><flowable:taskListener event="create"class="com.example.demo.listen.ManagerTaskHandler"></flowable:taskListener></extensionElements></userTask><userTask id="bossTask" name="老板审批"><extensionElements><flowable:taskListener event="create"class="com.example.demo.listen.BossTaskHandler"></flowable:taskListener></extensionElements></userTask><endEvent id="end" name="结束"></endEvent><sequenceFlow id="directorNotPassFlow" name="驳回" sourceRef="directorTak" targetRef="fillTask"><conditionExpression xsi:type="tFormalExpression"><![CDATA[${outcome=='驳回'}]]></conditionExpression></sequenceFlow><sequenceFlow id="bossNotPassFlow" name="驳回" sourceRef="bossTask" targetRef="fillTask"><conditionExpression xsi:type="tFormalExpression"><![CDATA[${outcome=='驳回'}]]></conditionExpression></sequenceFlow><sequenceFlow id="flow1" sourceRef="start" targetRef="fillTask"></sequenceFlow><sequenceFlow id="flow2" sourceRef="fillTask" targetRef="judgeTask"></sequenceFlow><sequenceFlow id="judgeMore" name="大于500元" sourceRef="judgeTask" targetRef="bossTask"><conditionExpression xsi:type="tFormalExpression"><![CDATA[${money > 500}]]></conditionExpression></sequenceFlow><sequenceFlow id="bossPassFlow" name="通过" sourceRef="bossTask" targetRef="end"><conditionExpression xsi:type="tFormalExpression"><![CDATA[${outcome=='通过'}]]></conditionExpression></sequenceFlow><sequenceFlow id="directorPassFlow" name="通过" sourceRef="directorTak" targetRef="end"><conditionExpression xsi:type="tFormalExpression"><![CDATA[${outcome=='通过'}]]></conditionExpression></sequenceFlow><sequenceFlow id="judgeLess" name="小于500元" sourceRef="judgeTask" targetRef="directorTak"><conditionExpression xsi:type="tFormalExpression"><![CDATA[${money <= 500}]]></conditionExpression></sequenceFlow></process><bpmndi:BPMNDiagram id="BPMNDiagram_Expense"><bpmndi:BPMNPlane bpmnElement="Expense" id="BPMNPlane_Expense"><bpmndi:BPMNShape bpmnElement="start" id="BPMNShape_start"><omgdc:Bounds height="30.0" width="30.0" x="285.0" y="135.0"></omgdc:Bounds></bpmndi:BPMNShape><bpmndi:BPMNShape bpmnElement="fillTask" id="BPMNShape_fillTask"><omgdc:Bounds height="80.0" width="100.0" x="405.0" y="110.0"></omgdc:Bounds></bpmndi:BPMNShape><bpmndi:BPMNShape bpmnElement="judgeTask" id="BPMNShape_judgeTask"><omgdc:Bounds height="40.0" width="40.0" x="585.0" y="130.0"></omgdc:Bounds></bpmndi:BPMNShape><bpmndi:BPMNShape bpmnElement="directorTak" id="BPMNShape_directorTak"><omgdc:Bounds height="80.0" width="100.0" x="735.0" y="110.0"></omgdc:Bounds></bpmndi:BPMNShape><bpmndi:BPMNShape bpmnElement="bossTask" id="BPMNShape_bossTask"><omgdc:Bounds height="80.0" width="100.0" x="555.0" y="255.0"></omgdc:Bounds></bpmndi:BPMNShape><bpmndi:BPMNShape bpmnElement="end" id="BPMNShape_end"><omgdc:Bounds height="28.0" width="28.0" x="771.0" y="281.0"></omgdc:Bounds></bpmndi:BPMNShape><bpmndi:BPMNEdge bpmnElement="flow1" id="BPMNEdge_flow1"><omgdi:waypoint x="315.0" y="150.0"></omgdi:waypoint><omgdi:waypoint x="405.0" y="150.0"></omgdi:waypoint></bpmndi:BPMNEdge><bpmndi:BPMNEdge bpmnElement="flow2" id="BPMNEdge_flow2"><omgdi:waypoint x="505.0" y="150.16611295681062"></omgdi:waypoint><omgdi:waypoint x="585.4333333333333" y="150.43333333333334"></omgdi:waypoint></bpmndi:BPMNEdge><bpmndi:BPMNEdge bpmnElement="judgeLess" id="BPMNEdge_judgeLess"><omgdi:waypoint x="624.5530726256983" y="150.44692737430168"></omgdi:waypoint><omgdi:waypoint x="735.0" y="150.1392757660167"></omgdi:waypoint></bpmndi:BPMNEdge><bpmndi:BPMNEdge bpmnElement="directorNotPassFlow" id="BPMNEdge_directorNotPassFlow"><omgdi:waypoint x="785.0" y="110.0"></omgdi:waypoint><omgdi:waypoint x="785.0" y="37.0"></omgdi:waypoint><omgdi:waypoint x="455.0" y="37.0"></omgdi:waypoint><omgdi:waypoint x="455.0" y="110.0"></omgdi:waypoint></bpmndi:BPMNEdge><bpmndi:BPMNEdge bpmnElement="bossPassFlow" id="BPMNEdge_bossPassFlow"><omgdi:waypoint x="655.0" y="295.0"></omgdi:waypoint><omgdi:waypoint x="771.0" y="295.0"></omgdi:waypoint></bpmndi:BPMNEdge><bpmndi:BPMNEdge bpmnElement="judgeMore" id="BPMNEdge_judgeMore"><omgdi:waypoint x="605.4340277777778" y="169.56597222222223"></omgdi:waypoint><omgdi:waypoint x="605.1384083044983" y="255.0"></omgdi:waypoint></bpmndi:BPMNEdge><bpmndi:BPMNEdge bpmnElement="directorPassFlow" id="BPMNEdge_directorPassFlow"><omgdi:waypoint x="785.0" y="190.0"></omgdi:waypoint><omgdi:waypoint x="785.0" y="281.0"></omgdi:waypoint></bpmndi:BPMNEdge><bpmndi:BPMNEdge bpmnElement="bossNotPassFlow" id="BPMNEdge_bossNotPassFlow"><omgdi:waypoint x="555.0" y="295.0"></omgdi:waypoint><omgdi:waypoint x="455.0" y="295.0"></omgdi:waypoint><omgdi:waypoint x="455.0" y="190.0"></omgdi:waypoint></bpmndi:BPMNEdge></bpmndi:BPMNPlane></bpmndi:BPMNDiagram>
</definitions>

其中的两个代理类为：

package com.gblfy.flowable.listen;import org.flowable.engine.delegate.TaskListener;
import org.flowable.task.service.delegate.DelegateTask;/*** @Author: gblfy* @Description:* @Date: Create in 2019/11/03 10:26*/
public class BossTaskHandler implements TaskListener {@Overridepublic void notify(DelegateTask delegateTask) {delegateTask.setAssignee("老板");}
}

package com.gblfy.flowable.listen;import org.flowable.engine.delegate.TaskListener;
import org.flowable.task.service.delegate.DelegateTask;/*** @Author: gblfy* @Description:* @Date: Create in 2019/11/03 10:26*/
public class ManagerTaskHandler implements TaskListener {@Overridepublic void notify(DelegateTask delegateTask) {delegateTask.setAssignee("经理");}
}

尽管上面的BPMN文件很长，但放心，毕竟那是通过相关的工具生成出来的，对于核心的逻辑部分也很少（主要在process 标签内），如需要详细了解的可自行学习下BPMN的标签即可！当然，在flowable的使用文档中也有相关的描述,详见：Creating a ProcessEngine
在这里插入图片描述
这样当此框架启动的时候它会默认加载resource目录下的processes时就可以将此流程配置加载到数据库进行持久化

3.5. 测试controller

@Controller
@RequestMapping(value = "expense")
public class ExpenseController {@Autowiredprivate RuntimeService runtimeService;@Autowiredprivate TaskService taskService;@Autowiredprivate RepositoryService repositoryService;@Autowiredprivate ProcessEngine processEngine;/***************此处为业务代码******************/
}

/*** 添加报销** @param userId    用户Id* @param money     报销金额* @param descption 描述*/@RequestMapping(value = "add")@ResponseBodypublic String addExpense(String userId, Integer money, String descption) {//启动流程HashMap<String, Object> map = new HashMap<>();map.put("taskUser", userId);map.put("money", money);ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("Expense", map);return "提交成功.流程Id为：" + processInstance.getId();}//上面的代码通过接收用户的一个请求传入用户的ID和金额以及描述信息来开启一个报销流程，并返回给用户这个流程的Id

/*** 获取审批管理列表 */@RequestMapping(value = "/list")@ResponseBodypublic Object list(String userId) {List<Task> tasks = taskService.createTaskQuery().taskAssignee(userId).orderByTaskCreateTime().desc().list();for (Task task : tasks) {System.out.println(task.toString());}return tasks.toArray().toString();}查询流程列表，待办列表,通过上面的代码获取出此用户需要处理的流程

/*** 批准** @param taskId 任务ID*/@RequestMapping(value = "apply")@ResponseBodypublic String apply(String taskId) {Task task = taskService.createTaskQuery().taskId(taskId).singleResult();if (task == null) {throw new RuntimeException("流程不存在");}//通过审核HashMap<String, Object> map = new HashMap<>();map.put("outcome", "通过");taskService.complete(taskId, map);return "processed ok!";}通过前端传入的任务ID来对此流程进行同意处理

 /*** 拒绝*/@ResponseBody@RequestMapping(value = "reject")public String reject(String taskId) {HashMap<String, Object> map = new HashMap<>();map.put("outcome", "驳回");taskService.complete(taskId, map);return "reject";}//  通过前端传入的任务ID来对此流程进行驳回处理

/*** 生成流程图 生成当前流程节点的流程图** @param processId 任务ID*/@RequestMapping(value = "processDiagram")public void genProcessDiagram(HttpServletResponse httpServletResponse, String processId) throws Exception {ProcessInstance pi = runtimeService.createProcessInstanceQuery().processInstanceId(processId).singleResult();//流程走完的不显示图if (pi == null) {return;}Task task = taskService.createTaskQuery().processInstanceId(pi.getId()).singleResult();//使用流程实例ID，查询正在执行的执行对象表，返回流程实例对象String InstanceId = task.getProcessInstanceId();List<Execution> executions = runtimeService.createExecutionQuery().processInstanceId(InstanceId).list();//得到正在执行的Activity的IdList<String> activityIds = new ArrayList<>();List<String> flows = new ArrayList<>();for (Execution exe : executions) {List<String> ids = runtimeService.getActiveActivityIds(exe.getId());activityIds.addAll(ids);}//获取流程图BpmnModel bpmnModel = repositoryService.getBpmnModel(pi.getProcessDefinitionId());ProcessEngineConfiguration engconf = processEngine.getProcessEngineConfiguration();ProcessDiagramGenerator diagramGenerator = engconf.getProcessDiagramGenerator();InputStream in = diagramGenerator.generateDiagram(bpmnModel, "png", activityIds, flows, engconf.getActivityFontName(), engconf.getLabelFontName(), engconf.getAnnotationFontName(), engconf.getClassLoader(), 1.0);OutputStream out = null;byte[] buf = new byte[1024];int legth = 0;try {out = httpServletResponse.getOutputStream();while ((legth = in.read(buf)) != -1) {out.write(buf, 0, legth);}} finally {if (in != null) {in.close();}if (out != null) {out.close();}}}

3.6. 图片乱码处理

通过传入流程ID生成当前流程的流程图给前端,如果流程中使用到中文且生成的图片是乱码的，则需要进配置下字体：

package com.gblfy.flowable.config;import org.flowable.spring.SpringProcessEngineConfiguration;
import org.flowable.spring.boot.EngineConfigurationConfigurer;
import org.springframework.context.annotation.Configuration;/*** @Author: gblfy* @Description: 为放置生成的流程图中中文乱码* @Date: Create in 2019/11/03 10:26*/
@Configuration
public class FlowableConfig implements EngineConfigurationConfigurer<SpringProcessEngineConfiguration> {@Overridepublic void configure(SpringProcessEngineConfiguration springProcessEngineConfiguration) {springProcessEngineConfiguration.setActivityFontName("宋体");springProcessEngineConfiguration.setLabelFontName("宋体");springProcessEngineConfiguration.setAnnotationFontName("宋体");}
}