springboot+flowable工作流三三来迟

springboot集成flowable工作流之梅开三度，常言道温故而知新，咱也回故一下。
1、使用flowable-ui制作流程图
运行flowable-6.6.0官方demo，打开网址：http://localhost:8080/flowable-ui，输入账号admin/test登录即可，如下

进入APP.MODELER.TITLE创建流程，之后可以导出流程到项目中直接使用。
流程图如下

导出的工作流文件如下

其中学生、教师、校长节点需指定固定值，如${studentId}，后面在流程操作中输入指定的id即可。
2、创建springboot工程
pom依赖

	
        org.springframework.boot
        spring-boot-starter-parent
        2.6.2
         
    
    ...
		
            org.flowable
            flowable-spring-boot-starter
            6.6.0
        

application.yml文件

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/flowable?useSSL=false&characterEncoding=UTF-8
    driver-class-name: com.mysql.jdbc.Driver
    username: 
    password: 

接口

	@Autowired
    private RuntimeService runtimeService;

    @Autowired
    private HistoryService historyService;

    @Autowired
    private TaskService taskService;

    @Autowired
    private RepositoryService repositoryService;

    @Resource
    private ProcessEngine processEngine;

    /**
     * @description: 发起请假流程(请假)
     * @author: ldc
     * @date: 2022/1/24 15:13
     */
    @RequestMapping(value = "startLeave4")
    public String startLeave4(String userId) {
        Map map = new HashMap<>();
        map.put("studentId", userId);
        map.put("leaveDays",2);
        map.put("leaveReason","生病");
        ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("leave4", map);
        return "请假流程processInstanceId：" + processInstance.getId();
    }

    /**
     * @description: 获取用户的任务（可以是学生、教师、校长）
     * @author: ldc
     * @date: 2022/1/24 15:27
     */
    @RequestMapping(value = "getTasks4")
    public String getTasks4(String userId) {
        StringBuilder sb = new StringBuilder();
        List tasks = taskService.createTaskQuery().taskAssignee(userId).orderByTaskCreateTime().desc().list();
        for (Task task : tasks) {
            sb.append("任务taskId: " + task.getId() + ";");
        }
        return sb.toString();
    }

    /**
     * @description: 审批(同意)
     * @author: ldc
     * @date: 2022/1/24 15:52
     */
    @RequestMapping(value = "agree4")
    public String agree4(String user,String userId,String taskId) {
        Task task = taskService.createTaskQuery().taskId(taskId).singleResult();
        if (task == null) {
            System.out.println("该任务对应的流程不存在");
            return "该任务对应的流程不存在";
        }
        Map map = new HashMap<>();
        map.put(user, userId);
        map.put("command", "agree");
        taskService.complete(taskId, map);
        return "审核通过";
    }

    /**
     * @description: 审批(拒绝)
     * @author: ldc
     * @date: 2022/1/24 15:53
     */
    @RequestMapping(value = "refuse4")
    public String refuse4(String user,String userId,String taskId) {
        Task task = taskService.createTaskQuery().taskId(taskId).singleResult();
        if (task == null) {
            System.out.println("该任务对应的流程不存在");
            return "该任务对应的流程不存在";
        }
        Map map = new HashMap<>();
        map.put(user, userId);
        map.put("command", "refuse");
        taskService.complete(taskId, map);
        return "审核驳回";
    }

    /**
     * @description: 查看流程图，待执行的标红
     * @author: ldc
     * @date: 2022/1/24 17:11
     */ 
    @RequestMapping(value = "processDiagram4")
    public void genProcessDiagram4(HttpServletResponse httpServletResponse, String processInstanceId) throws Exception {
        // 根据流程实例Id查询该流程实例的具体信息
        ProcessInstance processInstance = runtimeService.createProcessInstanceQuery().processInstanceId(processInstanceId).singleResult();
        // 获得流程定义Id
        String processDefinitionId;
        // 流程走完的从历史中获取
        if (processInstance == null) {
            //return;
            HistoricProcessInstance historicProcessInstance = historyService.createHistoricProcessInstanceQuery().processInstanceId(processInstanceId).singleResult();
            processDefinitionId = historicProcessInstance.getProcessDefinitionId();
        } else {
            processDefinitionId = processInstance.getProcessDefinitionId();
        }
        Task task = taskService.createTaskQuery().processInstanceId(processInstanceId).singleResult();
        if (task == null) {
            //return;
        }
        // 根据流程实例Id查询该流程实例正在执行的活动
        List executions = runtimeService.createExecutionQuery().processInstanceId(processInstanceId).list();
        // 得到正在执行的活动Id
        List activityIds = new ArrayList<>();
        List flows = new ArrayList<>();
        for (Execution execution : executions) {
            List ids = runtimeService.getActiveActivityIds(execution.getId());
            activityIds.addAll(ids);
        }
        // 获取流程图
        BpmnModel bpmnModel = repositoryService.getBpmnModel(processDefinitionId);
        ProcessEngineConfiguration engineConfiguration = processEngine.getProcessEngineConfiguration();
        ProcessDiagramGenerator diagramGenerator = engineConfiguration.getProcessDiagramGenerator();
        InputStream in = diagramGenerator.generateDiagram(bpmnModel,
                "png",
                activityIds,
                flows,
                engineConfiguration.getActivityFontName(),
                engineConfiguration.getLabelFontName(),
                engineConfiguration.getAnnotationFontName(),
                engineConfiguration.getClassLoader(),
                1.0,
                true);
        OutputStream out = null;
        byte[] buf = new byte[1024];
        int length = 0;
        try {
            out = httpServletResponse.getOutputStream();
            while ((length = in.read(buf)) != -1) {
                out.write(buf, 0, length);
            }
        } finally {
            if (in != null) {
                in.close();
            }
            if (out != null) {
                out.close();
            }
        }
    }

    /**
     * @description: 查看流程图，完成的标红
     * @author: ldc
     * @date: 2022/1/26 11:07
     */
    @RequestMapping(value = "processDiagram44")
    public void genProcessDiagram44(HttpServletResponse httpServletResponse, String processInstanceId) {
        // 获得流程定义Id
        String processDefinitionId;
        if (this.isFinished(processInstanceId)) {
            // 如果流程已经结束
            // 根据流程实例Id查询该流程实例的具体信息
            HistoricProcessInstance historicProcessInstance = historyService.createHistoricProcessInstanceQuery().processInstanceId(processInstanceId).singleResult();
            String id = historicProcessInstance.getId();
            processDefinitionId = historicProcessInstance.getProcessDefinitionId();
            String startActivityId = historicProcessInstance.getStartActivityId();
            String endActivityId = historicProcessInstance.getEndActivityId();
            System.out.println("id:" + id + ",processDefinitionId:" + processDefinitionId + ",startActivityId:" + startActivityId + ",endActivityId:" + endActivityId);
        } else {
            // 如果流程没有结束
            // 根据流程实例Id查询该流程实例的具体信息
            ProcessInstance processInstance = runtimeService.createProcessInstanceQuery().processInstanceId(processInstanceId).singleResult();
            processDefinitionId = processInstance.getProcessDefinitionId();
            String id = processInstance.getId();
            String activityId = processInstance.getActivityId();
            System.out.println("id:" + id + ",processDefinitionId:" + processDefinitionId + ",activityId:" + activityId);
        }

        List highLightedActivityIds = new ArrayList<>();
        List highLightedFlows = new ArrayList<>();
        // 根据流程实例Id查询该流程实例下所有历史活动实例或查询正在执行的活动实例
        List historicActivityInstanceList =  historyService.createHistoricActivityInstanceQuery().processInstanceId(processInstanceId).orderByHistoricActivityInstanceStartTime().asc().list();
        for(HistoricActivityInstance historicActivityInstance : historicActivityInstanceList){
            String activityId = historicActivityInstance.getActivityId();
            highLightedActivityIds.add(activityId);
            if ("startEvent".equals(historicActivityInstance.getActivityType())) {
                System.out.println("startEvent" + historicActivityInstance.getActivityName());
                //highLightedActivityIds.add(activityId);
            }
            if ("userTask".equals(historicActivityInstance.getActivityType())) {
                System.out.println("userTask" + historicActivityInstance.getActivityName());
                //highLightedActivityIds.add(activityId);
            }
            if ("sequenceFlow".equals(historicActivityInstance.getActivityType())) {
                System.out.println("sequenceFlow" + historicActivityInstance.getActivityName());
                highLightedFlows.add(historicActivityInstance.getActivityId());
            }
            if ("endEvent".equals(historicActivityInstance.getActivityType())) {
                System.out.println("endEvent" + historicActivityInstance.getActivityName());
                //highLightedActivityIds.add(activityId);
            }
        }

        // 根据流程定义Id获取bpmn模型
        // 获取流程图
        BpmnModel bpmnModel = repositoryService.getBpmnModel(processDefinitionId);
        ProcessEngineConfiguration engineConfiguration = processEngine.getProcessEngineConfiguration();
        ProcessDiagramGenerator diagramGenerator = engineConfiguration.getProcessDiagramGenerator();
        InputStream in = diagramGenerator.generateDiagram(bpmnModel,
                "png",
                highLightedActivityIds,
                highLightedFlows,
                engineConfiguration.getActivityFontName(),
                engineConfiguration.getLabelFontName(),
                engineConfiguration.getAnnotationFontName(),
                engineConfiguration.getClassLoader(),
                1.0,
                true);
        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);
            }
        } catch (IOException e) {
        } finally {
            IOUtils.closeQuietly(out);
            IOUtils.closeQuietly(in);
        }
    }

测试
学生发起请假

查看用户的任务

查看当前状态的流程图

其中红框表示最新的已经执行完成的节点。
或

其中红框表示所有的已经执行完成的节点。
教师审批同意

查看流程图


校长审批同意

查看流程图


结束审批同意

查看流程图