Activiti的附件管理實戰

一 代碼

/**
 * @className: GetAttachment
 * @description: 任務附件查詢
 * @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: 任務附件查詢
 * @date: 2020/4/20
 * @author: cakin
 */
public class GetAttachment {

    public static void main( String[] args ) throws Exception {
        // 獲取流程引擎實例
        ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
        // 獲取任務服務組件
        TaskService taskService = engine.getTaskService();
        // 獲取運行服務組件
        RuntimeService runtimeService = engine.getRuntimeService();
        // 流程存儲服務組件
        RepositoryService repositoryService = engine.getRepositoryService();
        // 部署流程描述文件
        Deployment dep = repositoryService.createDeployment()
                .addClasspathResource("bpmn/vacation.bpmn").deploy();
        // 查找流程定義
        ProcessDefinition pd = repositoryService.createProcessDefinitionQuery()
                .deploymentId(dep.getId()).singleResult();
        // 啓動流程
        ProcessInstance pi = runtimeService
                .startProcessInstanceById(pd.getId());
        // 查找任務
        Task task = taskService.createTaskQuery().processInstanceId(pi.getId())
                .singleResult();
        // 設置任務附件
        Attachment att1 = taskService.createAttachment("web url", task.getId(), pi.getId(), "Attachement1",
                "163 web page", "http://www.163.com");
        // 創建圖片輸入流
        InputStream is = new FileInputStream(new File("src/main/resources/artifact/result.png"));
        // 設置輸入流爲任務附件
        Attachment att2 = taskService.createAttachment("web url", task.getId(), pi.getId(), "Attachement2",
                "Image InputStream", is);
        // 根據流程實例ID查詢附件
        List<Attachment> attas1 = taskService.getProcessInstanceAttachments(pi.getId());
        System.out.println("流程附件數量：" + attas1.size());
        // 根據任務ID查詢附件
        List<Attachment> attas2 = taskService.getTaskAttachments(task.getId());
        System.out.println("任務附件數量：" + attas2.size());
        // 根據附件ID查詢附件
        Attachment attResult = taskService.getAttachment(att1.getId());
        System.out.println("附件1名稱：" + attResult.getName());
        // 根據附件ID查詢附件內容
        InputStream stream1 = taskService.getAttachmentContent(att1.getId());
        System.out.println("附件1的輸入流：" + stream1);
        InputStream stream2 = taskService.getAttachmentContent(att2.getId());
        System.out.println("附件2的輸入流：" + stream2);
    }
}

二 查詢結果

流程附件數量：2
任務附件數量：2
附件1名稱：Attachement1
附件1的輸入流：null
附件2的輸入流：java.io.ByteArrayInputStream@773cbf4f

三 數據庫

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