Activiti的附件管理实战

矫情吗；* 2021-07-25 01:12 920阅读 0赞

**一 代码**

/**
     * @className: GetAttachment
     * @description: 任务附件查询
     * @date: 2020/4/20
     * @author: cakin
     */
    package com.syc.activiti;
    
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.InputStream;
    import java.util.List;
    
    import org.activiti.engine.ProcessEngine;
    import org.activiti.engine.ProcessEngines;
    import org.activiti.engine.RepositoryService;
    import org.activiti.engine.RuntimeService;
    import org.activiti.engine.TaskService;
    import org.activiti.engine.repository.Deployment;
    import org.activiti.engine.repository.ProcessDefinition;
    import org.activiti.engine.runtime.ProcessInstance;
    import org.activiti.engine.task.Attachment;
    import org.activiti.engine.task.Task;
    
    /**
     * @className: GetAttachment
     * @description: 任务附件查询
     * @date: 2020/4/20
     * @author: cakin
     */
    public class GetAttachment {
    
        public static void main( String[] args ) throws Exception {
            // 获取流程引擎实例
            ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
            // 获取任务服务组件
            TaskService taskService = engine.getTaskService();
            // 获取运行服务组件
            RuntimeService runtimeService = engine.getRuntimeService();
            // 流程存储服务组件
            RepositoryService repositoryService = engine.getRepositoryService();
            // 部署流程描述文件
            Deployment dep = repositoryService.createDeployment()
                    .addClasspathResource("bpmn/vacation.bpmn").deploy();
            // 查找流程定义
            ProcessDefinition pd = repositoryService.createProcessDefinitionQuery()
                    .deploymentId(dep.getId()).singleResult();
            // 启动流程
            ProcessInstance pi = runtimeService
                    .startProcessInstanceById(pd.getId());
            // 查找任务
            Task task = taskService.createTaskQuery().processInstanceId(pi.getId())
                    .singleResult();
            // 设置任务附件
            Attachment att1 = taskService.createAttachment("web url", task.getId(), pi.getId(), "Attachement1",
                    "163 web page", "http://www.163.com");
            // 创建图片输入流
            InputStream is = new FileInputStream(new File("src/main/resources/artifact/result.png"));
            // 设置输入流为任务附件
            Attachment att2 = taskService.createAttachment("web url", task.getId(), pi.getId(), "Attachement2",
                    "Image InputStream", is);
            // 根据流程实例ID查询附件
            List<Attachment> attas1 = taskService.getProcessInstanceAttachments(pi.getId());
            System.out.println("流程附件数量：" + attas1.size());
            // 根据任务ID查询附件
            List<Attachment> attas2 = taskService.getTaskAttachments(task.getId());
            System.out.println("任务附件数量：" + attas2.size());
            // 根据附件ID查询附件
            Attachment attResult = taskService.getAttachment(att1.getId());
            System.out.println("附件1名称：" + attResult.getName());
            // 根据附件ID查询附件内容
            InputStream stream1 = taskService.getAttachmentContent(att1.getId());
            System.out.println("附件1的输入流：" + stream1);
            InputStream stream2 = taskService.getAttachmentContent(att2.getId());
            System.out.println("附件2的输入流：" + stream2);
        }
    }

**二 查询结果**

流程附件数量：2
    任务附件数量：2
    附件1名称：Attachement1
    附件1的输入流：null
    附件2的输入流：java.io.ByteArrayInputStream@773cbf4f

**三 数据库**

1 act\_hi\_attachment

mysql> select * from act_hi_attachment;
    +--------+------+----------+---------+--------------+---------+----------+---------------+--------------------+-------------+-------------------------+
    | ID_    | REV_ | USER_ID_ | NAME_   | DESCRIPTION_ | TYPE_   | TASK_ID_ | PROC_INST_ID_ | URL_               | CONTENT_ID_ | TIME_                   |
    +--------+------+----------+---------+--------------+---------+----------+---------------+--------------------+-------------+-------------------------+
    | 132509 |    1 | NULL     | 163.com | 163 web page | web url | 132508   | 132504        | http://www.163.com | NULL        | 2020-04-20 20:04:01.513 |
    | 132511 |    1 | NULL     | 163.com | 163 web page | web url | 132508   | 132504        | NULL               | 132512      | 2020-04-20 20:04:01.561 |
    +--------+------+----------+---------+--------------+---------+----------+---------------+--------------------+-------------+-------------------------+
    2 rows in set (0.00 sec)

2 act\_hi\_attachment

![20200420200844962.png][]

[20200420200844962.png]: /images/20210724/e13bb3b53da044d4ad24247f41873ce6.png