Springboot整合Camunda工作流引擎实现审批流程实例

<camunda.version>7.18.0</camunda.version>
<dependency>
  <groupId>org.camunda.bpm.springboot</groupId>
  <artifactId>camunda-bpm-spring-boot-starter-webapp</artifactId>
  <version>${camunda.version}</version>
</dependency>
<dependency>
  <groupId>org.camunda.bpm.springboot</groupId>
  <artifactId>camunda-bpm-spring-boot-starter-rest</artifactId>
  <version>${camunda.version}</version>
</dependency>

camunda.bpm:
  webapp:
    # 设置管理控制台的访问上下文
    application-path: /workflow
  auto-deployment-enabled: true
  admin-user:
    # 配置登录管理控制台的用户
    id: admin
    password: admin
    firstName: admin
  filter:
    create: All tasks
  database:
    #数据库类型
    type: mysql 
    #是否自动更新表信息
    schema-update: true
logging:
  level:
    #配置日志，这样在开发过程中就能看到每步执行的SQL语句了
    '[org.camunda.bpm.engine.impl.persistence.entity]': debug
---
spring:
  jersey:
    application-path: /api-flow
    type: servlet
    servlet:
      load-on-startup: 0

<?xml versinotallow="1.0" encoding="UTF-8"?>
<bpmn2:definitions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:bpmn2="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" xmlns:di="http://www.omg.org/spec/DD/20100524/DI" xmlns:camunda="http://camunda.org/schema/1.0/bpmn" id="sample-diagram" targetNamespace="http://pack.org/bpmn" xsi:schemaLocation="http://www.omg.org/spec/BPMN/20100524/MODEL BPMN20.xsd">
  <bpmn2:process id="Process_1" isExecutable="true">
    <bpmn2:startEvent id="StartEvent_1">
      <bpmn2:outgoing>Flow_18pxcpx</bpmn2:outgoing>
    </bpmn2:startEvent>
    <bpmn2:sequenceFlow id="Flow_18pxcpx" sourceRef="StartEvent_1" targetRef="Activity_0vs8hu4" />
    <bpmn2:userTask id="Activity_0vs8hu4" camunda:assignee="${uid}">
      <bpmn2:incoming>Flow_18pxcpx</bpmn2:incoming>
      <bpmn2:outgoing>Flow_0n014x3</bpmn2:outgoing>
    </bpmn2:userTask>
    <bpmn2:sequenceFlow id="Flow_0n014x3" sourceRef="Activity_0vs8hu4" targetRef="Activity_0bcruuz" />
    <bpmn2:userTask id="Activity_0bcruuz" camunda:assignee="${mid}">
      <bpmn2:incoming>Flow_0n014x3</bpmn2:incoming>
      <bpmn2:outgoing>Flow_0dsfy6s</bpmn2:outgoing>
    </bpmn2:userTask>
    <bpmn2:endEvent id="Event_1xosttx">
      <bpmn2:incoming>Flow_0dsfy6s</bpmn2:incoming>
    </bpmn2:endEvent>
    <bpmn2:sequenceFlow id="Flow_0dsfy6s" sourceRef="Activity_0bcruuz" targetRef="Event_1xosttx" />
  </bpmn2:process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_1">
    <bpmndi:BPMNPlane id="BPMNPlane_1" bpmnElement="Process_1">
      <bpmndi:BPMNShape id="_BPMNShape_StartEvent_2" bpmnElement="StartEvent_1">
        <dc:Bounds x="252" y="252" width="36" height="36" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape id="Activity_1py8b5e_di" bpmnElement="Activity_0vs8hu4">
        <dc:Bounds x="340" y="230" width="100" height="80" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape id="Activity_0arbs87_di" bpmnElement="Activity_0bcruuz">
        <dc:Bounds x="500" y="230" width="100" height="80" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape id="Event_1xosttx_di" bpmnElement="Event_1xosttx">
        <dc:Bounds x="662" y="252" width="36" height="36" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge id="Flow_18pxcpx_di" bpmnElement="Flow_18pxcpx">
        <di:waypoint x="288" y="270" />
        <di:waypoint x="340" y="270" />
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge id="Flow_0n014x3_di" bpmnElement="Flow_0n014x3">
        <di:waypoint x="440" y="270" />
        <di:waypoint x="500" y="270" />
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge id="Flow_0dsfy6s_di" bpmnElement="Flow_0dsfy6s">
        <di:waypoint x="600" y="270" />
        <di:waypoint x="662" y="270" />
      </bpmndi:BPMNEdge>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</bpmn2:definitions>

@RestController
@RequestMapping("/camunda")
public class BpmnController {


  // 上传路径
  @Value("${gx.camunda.upload}")
  private String path ;
  
  // 通用的工作流操作api服务类
  @Resource
  private ProcessService processService ;
  
  @PostMapping("/bpmn/upload")
  public AjaxResult uploadFile(MultipartFile file, String fileName, String name) throws Exception {
    try {
      // 上传并返回新文件名称
      InputStream is = file.getInputStream() ;
      File storageFile = new File(path + File.separator + fileName) ;
      FileOutputStream fos = new FileOutputStream(new File(path + File.separator + fileName)) ;
      byte[] buf = new byte[10 * 1024] ;
      int len = -1 ;
      while((len = is.read(buf)) > -1) {
        fos.write(buf, 0, len) ;
      }
      fos.close() ;
      is.close() ;
      // 创建部署流程
      processService.createDeploy(fileName, name, new FileSystemResource(storageFile)) ;
      return AjaxResult.success();
    } catch (Exception e) {
      return AjaxResult.error(e.getMessage());
    }
  }
}

// 这个是camunda spring boot starter 自动配置
@Resource
private RepositoryService repositoryService ;


public void createDeploy(String resourceName, String name, org.springframework.core.io.Resource resource) {
  try {
    Deployment deployment = repositoryService.createDeployment()
      .addInputStream(resourceName, resource.getInputStream())
      .name(name)
      .deploy();
    logger.info("流程部署id: {}", deployment.getId());
    logger.info("流程部署名称: {}", deployment.getName());
  } catch (IOException e) {
    throw new RuntimeException(e) ;
  }
}

@RestController
@RequestMapping("/process")
public class ProcessController {


  @Resource
  private ProcessService processService ;
  
  // 根据流程定义id，启动流程；整个流程需要动态传2个参数（审批人），如果不传将会报错
  @GetMapping("/start/{processDefinitionId}")
  public AjaxResult startProcess(@PathVariable("processDefinitionId") String processDefinitionId) {
    Map<String, Object> variables = new HashMap<>() ;
    variables.put("uid", "1") ;
    variables.put("mid", "1000") ;
    processService.startProcessInstanceAssignVariables(processDefinitionId, "AKF", variables) ;
    return AjaxResult.success("流程启动成功") ;
  }
}

@Resource
private RuntimeService runtimeService ;


public ProcessInstance startProcessInstanceAssignVariables(String processDefinitionId, String businessKey, Map<String, Object> variables) {
  ProcessInstance processInstance = runtimeService.startProcessInstanceById(processDefinitionId, businessKey, variables);
  logger.info("流程定义ID: {}", processInstance.getProcessDefinitionId());
  logger.info("流程实例ID: {}", processInstance.getId());
  logger.info("BussinessKey: {}", processInstance.getBusinessKey()) ;
  return processInstance ;
}

@Resource
private TaskService taskService ;
@Resource
private ManagementService managementService ;
// 根据时间段查询
public List<Task> queryTasksByBusinessAndCreateTime(String assignee, String businessKey, String startTime, String endTime) {
  NativeTaskQuery nativeQuery = taskService.createNativeTaskQuery() ;
  nativeQuery.sql("select distinct RES.* from " + managementService.getTableName(TaskEntity.class) +  " RES "
                  + " left join " + managementService.getTableName(IdentityLinkEntity.class) + " I on I.TASK_ID_ = RES.ID_ "
                  + " WHERE (RES.ASSIGNEE_ = #{assignee} or "
                  + " (RES.ASSIGNEE_ is null and I.TYPE_ = 'candidate' "
                  + " and (I.USER_ID_ = #{assignee} or I.GROUP_ID_ IN ( #{assignee} ) ))) "
                  + " and RES.CREATE_TIME_ between #{startTime} and #{endTime} "
                  + " order by RES.CREATE_TIME_ asc LIMIT #{size} OFFSET 0") ;
  nativeQuery.parameter("assignee", assignee) ;
  nativeQuery.parameter("startTime", startTime) ;
  nativeQuery.parameter("endTime", endTime) ;
  nativeQuery.parameter("size", Integer.MAX_VALUE) ;
  return nativeQuery.list() ;
}

@GetMapping("/approve/{id}")
public AjaxResult approve(@PathVariable("id") String instanceId) {
  if (StringUtils.isEmpty(instanceId)) {
    return AjaxResult.error("未知审批任务") ;
  }
  // 下面的参数信息应该自行保存管理（与发起审批设置的指派人要一致）
  Map<String, Object> variables = new HashMap<>() ;
  // 第一个节点所要提供的遍历信息（这里就是依次类推，mid等）
  variables.put("uid", "1") ;
  processService.executionTask(variables, instanceId, task -> {}, null) ;
  return AjaxResult.success() ; 
}

@Resource
private TaskService taskService ;
@Resource
private RuntimeService runtimeService ;


@Transactional
public void executionTask(Map<String, Object> variables, String instanceId, Consumer<Task> consumer, String type) {
  Task task = taskService.createTaskQuery().processInstanceId(instanceId).singleResult() ;
  if (task == null) {
    logger.error("任务【{}】不存在", instanceId) ;
    throw new RuntimeException("任务【" + instanceId + "】不存在") ;
  }
  taskService.setVariables(task.getId(), variables);
  taskService.complete(task.getId(), variables) ;
  long count = runtimeService.createExecutionQuery().processInstanceId(instanceId).count();
  if (count == 0) {
    consumer.accept(task) ;
  }
}