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<dependencies>
	<dependency>
		<groupId>org.camunda.bpm</groupId>
		<artifactId>camunda-external-task-client</artifactId>
		<version>${camunda.external-task-client.version}</version>
	</dependency>
	<dependency>
		<groupId>org.slf4j</groupId>
		<artifactId>slf4j-simple</artifactId>
		<version>1.7.36</version>
	</dependency>
	<dependency>
		<groupId>javax.xml.bind</groupId>
		<artifactId>jaxb-api</artifactId>
		<version>2.3.1</version>
	</dependency>
</dependencies>

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import org.camunda.bpm.client.ExternalTaskClient;

import java.awt.*;
import java.net.URI;

public class Demo01 {
    public static void main(String[] args) {
        ExternalTaskClient client = ExternalTaskClient.create()
                .baseUrl("http://localhost:8080/engine-rest")
                .asyncResponseTimeout(10000) // 长轮询超时时间
                .build();
        // 订阅指定的外部任务
        client.subscribe("charge-card")
                .lockDuration(1000)
                .handler(((externalTask, externalTaskService) -> {
                    // 获取流程变量
                    String item = (String) externalTask.getVariable("item");
                    Long amount = (Long) externalTask.getVariable("amount");
                    System.out.println("item--->"+item + "  amount-->" + amount);
                    try {
                        Desktop.getDesktop().browse(new URI("https://docs.camunda.org/get-started/quick-start/complete"));
                    } catch (Exception e) {
                        e.printStackTrace();
                    }

                    // 完成任务
                    externalTaskService.complete(externalTask);
                })).open();
    }
}

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{
	"variables": {
		"amount": {
			"value":555,
			"type":"long"
		},
		"item": {
			"value": "item-xyz"
		}
	}
}

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<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.boge.workflow</groupId>
  <artifactId>camunda-project-demo</artifactId>
  <version>1.0.0-SNAPSHOT</version>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>8</maven.compiler.source>
    <maven.compiler.target>8</maven.compiler.target>
  </properties>

  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-dependencies</artifactId>
        <version>2.4.3</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>

      <dependency>
        <groupId>org.camunda.bpm</groupId>
        <artifactId>camunda-bom</artifactId>
        <version>7.15.0</version>
        <scope>import</scope>
        <type>pom</type>
      </dependency>
    </dependencies>
  </dependencyManagement>

  <dependencies>
    <dependency>
      <groupId>org.camunda.bpm.springboot</groupId>
      <artifactId>camunda-bpm-spring-boot-starter-rest</artifactId>
    </dependency>

    <dependency>
      <groupId>org.camunda.bpm.springboot</groupId>
      <artifactId>camunda-bpm-spring-boot-starter-webapp</artifactId>
    </dependency>

    <dependency>
      <groupId>org.camunda.bpm</groupId>
      <artifactId>camunda-engine-plugin-spin</artifactId>
    </dependency>

    <dependency>
      <groupId>org.camunda.spin</groupId>
      <artifactId>camunda-spin-dataformat-all</artifactId>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
      <groupId>com.h2database</groupId>
      <artifactId>h2</artifactId>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-jdbc</artifactId>
    </dependency>

  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
        <version>2.4.3</version>
      </plugin>
    </plugins>
  </build>

</project>

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spring.datasource.url: jdbc:h2:file:./camunda-h2-database

camunda.bpm.admin-user:
  id: demo
  password: demo

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    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
    </dependency>

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# spring.datasource.url: jdbc:h2:file:./camunda-h2-database

camunda.bpm.admin-user:
  id: demo
  password: demo
spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/camunda1?serverTimezone=Asia/Shanghai
    username: root
    password: 123456
camunda:
  bpm:
    database:
      type: mysql
      schema-update: true
    auto-deployment-enabled: false # 自动部署 resources 下的 bpmn文件

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@RestController
@RequestMapping("/flow")
public class FlowController {

    @Autowired
    private RepositoryService repositoryService;

    @GetMapping("/deploy")
    public String deplopy(){
        Deployment deploy = repositoryService.createDeployment()
                .name("部署的第一个流程") // 定义部署文件的名称
                .addClasspathResource("process.bpmn") // 绑定需要部署的流程文件
                .deploy();// 部署流程
        return deploy.getId() + ":" + deploy.getName();
    }
}

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package com.boge.workflow;


import org.camunda.bpm.engine.RepositoryService;
import org.camunda.bpm.engine.RuntimeService;
import org.camunda.bpm.engine.TaskService;
import org.camunda.bpm.engine.runtime.ProcessInstance;
import org.camunda.bpm.engine.task.Task;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.List;

@SpringBootTest(classes = Application.class)
public class ApplicationTest {

    @Autowired
    private RepositoryService repositoryService;

    @Autowired
    private RuntimeService runtimeService;

    @Autowired
    private TaskService taskService;

    /**
     * 启动流程的案例
     */
    @Test
    public void startFlow(){
        // 部署流程
        ProcessInstance processInstance = runtimeService
                .startProcessInstanceById("1a880f27-2e57-11ed-80d9-c03c59ad2248");
        // 部署的流程实例的相关信息
        System.out.println("processInstance.getId() = " + processInstance.getId());
        System.out.println("processInstance.getProcessDefinitionId() = " + processInstance.getProcessDefinitionId());
    }


}

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    /**
     * 查询任务
     *    待办
     *
     *  流程定义ID:processDefinition : 我们部署流程的时候会，每一个流程都会产生一个流程定义ID
     *  流程实例ID:processInstance ：我们启动流程实例的时候，会产生一个流程实例ID
     */
    @Test
    public void queryTask(){
        List<Task> list = taskService.createTaskQuery()
                //.processInstanceId("eff78817-2e58-11ed-aa3f-c03c59ad2248")
                .taskAssignee("demo1")
                .list();
        if(list != null && list.size() > 0){
            for (Task task : list) {
                System.out.println("task.getId() = " + task.getId());
                System.out.println("task.getAssignee() = " + task.getAssignee());
            }
        }
    }

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   /**
     * 完成任务
     */
    @Test
    public void completeTask(){
        // 根据用户找到关联的Task
        Task task = taskService.createTaskQuery()
                //.processInstanceId("eff78817-2e58-11ed-aa3f-c03c59ad2248")
                .taskAssignee("demo")
                .singleResult();
        if(task != null ){
            taskService.complete(task.getId());
            System.out.println("任务审批完成...");
        }
    }