【Activiti学习之二】Activiti API

2021-02-03 18:18

阅读：627

标签：字段排序 stl rgs div valueof field data 返回 single

环境
　　JDK 1.8
　　MySQL 5.6
　　Tomcat 7
　　Eclipse-Luna
　　activiti 6.0

一、Activiti数据查询
准备数据：

package com.wjy.act;

import org.activiti.engine.IdentityService;
import org.activiti.engine.ProcessEngine;
import org.activiti.engine.ProcessEngines;
import org.activiti.engine.identity.Group;

public class SaveGroup {

    public static void main(String[] args) {
        ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
        IdentityService is = engine.getIdentityService();
        for(int i = 0; i ) {
            Group group = is.newGroup(String.valueOf(i));
            group.setName("Group_" + i);
            group.setType("TYPE_" + i);
            is.saveGroup(group);//保存到表act_id_group
        }
        engine.close();
        System.exit(0);
        
    }

}

list 查询多条和count 数量统计：

package com.wjy.act;

import java.util.List;

import org.activiti.engine.IdentityService;
import org.activiti.engine.ProcessEngine;
import org.activiti.engine.ProcessEngines;
import org.activiti.engine.identity.Group;

public class TestList {

    public static void main(String[] args) {
        ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
        IdentityService is = engine.getIdentityService();
        
        //测试list查询
        List groups = is.createGroupQuery().list();
        for(Group g : groups) {
            System.out.println(g.getId() + "---" + g.getName() + "---" + g.getType());
        }
        //测试 count
        long size = is.createGroupQuery().count();
        System.out.println(size);
    }

}

listPage 分页查询：

package com.wjy.act;

import java.util.List;

import org.activiti.engine.IdentityService;
import org.activiti.engine.ProcessEngine;
import org.activiti.engine.ProcessEngines;
import org.activiti.engine.identity.Group;

public class TestListPage {

    public static void main(String[] args) {
        ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
        IdentityService is = engine.getIdentityService();
        
        //分页查询 listPage
        List groups = is.createGroupQuery().listPage(1, 5);
        for(Group g : groups) {
            System.out.println(g.getId() + "---" + g.getName() + "---" + g.getType());
        }
    }

}

singleResult 查询单条

package com.wjy.act;

import org.activiti.engine.IdentityService;
import org.activiti.engine.ProcessEngine;
import org.activiti.engine.ProcessEngines;
import org.activiti.engine.identity.Group;

public class TestSingle {

    public static void main(String[] args) {
        ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
        IdentityService is = engine.getIdentityService();
        //测试singleResult
        Group g = is.createGroupQuery().groupName("Group_0").singleResult();
        System.out.println(g.getId());
    }

}

asc 升序和desc 降序:

package com.wjy.act;

import java.util.List;

import org.activiti.engine.IdentityService;
import org.activiti.engine.ProcessEngine;
import org.activiti.engine.ProcessEngines;
import org.activiti.engine.identity.Group;

public class TestSort {

    public static void main(String[] args) {
        ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
        IdentityService is = engine.getIdentityService();
        //测试降序 升序  需要根据字段orderby  
        //多字段排序 orderby之后都要跟上asc() 或desc()
        //is.createGroupQuery().orderByGroupId().asc().orderByGroupName().asc().list();
        List groups = is.createGroupQuery().orderByGroupId().desc().orderByGroupName().asc().list();
        for(Group g : groups) {
            System.out.println(g.getId());
        }
    }

}

按照字段条件查询：

package com.wjy.act;

import java.util.List;

import org.activiti.engine.IdentityService;
import org.activiti.engine.ProcessEngine;
import org.activiti.engine.ProcessEngines;
import org.activiti.engine.identity.Group;

public class FieldQuery {

    public static void main(String[] args) {
        ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
        IdentityService is = engine.getIdentityService();
        //按照字段条件查询
        List groups = is.createGroupQuery().groupName("Group_1").groupType("TYPE_1").list();
        for(Group g : groups) {
            System.out.println(g.getId());
        }
    }

}

支持原生sql查询：

package com.wjy.act;

import java.util.List;

import org.activiti.engine.IdentityService;
import org.activiti.engine.ProcessEngine;
import org.activiti.engine.ProcessEngines;
import org.activiti.engine.identity.Group;

public class NativeQuery {

    public static void main(String[] args) {
        ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
        IdentityService is = engine.getIdentityService();

        //支持原生sql语句查询
        List groups = is.createNativeGroupQuery()
                .sql("SELECT * FROM ACT_ID_GROUP where NAME_ = #{name}")
                .parameter("name", "Group_2").list();
        for (Group g : groups) {
            System.out.println(g.getId());
        }
    }

}

二、流程文件部署
DeploymentBuilder对象
方法addClasspathResource：

package com.wjy.deploy;

import java.io.InputStream;

import org.activiti.engine.ProcessEngine;
import org.activiti.engine.ProcessEngines;
import org.activiti.engine.RepositoryService;
import org.activiti.engine.repository.Deployment;
import org.activiti.engine.repository.DeploymentBuilder;

public class TextQuery {

    public static void main(String[] args) throws Exception {
        ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
        // 存储服务
        RepositoryService rs = engine.getRepositoryService();
        
        DeploymentBuilder builder = rs.createDeployment();
        builder.addClasspathResource("my_text.txt");
        Deployment dep = builder.deploy();
        // 数据查询
        InputStream is = rs.getResourceAsStream(dep.getId(), "my_text.txt");
        int count = is.available();
        byte[] contents = new byte[count];
        is.read(contents);
        String result = new String(contents);
        //输入结果
        System.out.println(result);

    }

}

方法addInputStream：

package com.wjy.deploy;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;

import javax.imageio.ImageIO;

import org.activiti.engine.ProcessEngine;
import org.activiti.engine.ProcessEngines;
import org.activiti.engine.RepositoryService;
import org.activiti.engine.repository.Deployment;
import org.activiti.engine.repository.ProcessDefinition;

public class ImageQuery {

    public static void main(String[] args) throws Exception {
        // 创建流程引擎
        ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
        // 得到流程存储服务对象
        RepositoryService repositoryService = engine.getRepositoryService();
        // 部署一份流程文件与相应的流程图文件
        Deployment dep = repositoryService.createDeployment().addClasspathResource("gen.bpmn").deploy();
        // 查询流程定义
        ProcessDefinition def = repositoryService.createProcessDefinitionQuery().deploymentId(dep.getId()).singleResult();
        // 查询资源文件
        InputStream is = repositoryService.getProcessDiagram(def.getId());
        // 将输入流转换为图片对象  
        BufferedImage image = ImageIO.read(is);
        // 保存为图片文件
        File file = new File("resource/result.png");
        if (!file.exists()) file.createNewFile();
        FileOutputStream fos = new FileOutputStream(file);
        ImageIO.write(image, "png", fos);
        fos.close();
        is.close();
    }

}

方法addZipInputStream:

package com.wjy.deploy;

import java.io.File;
import java.io.FileInputStream;
import java.util.zip.ZipInputStream;

import org.activiti.engine.ProcessEngine;
import org.activiti.engine.ProcessEngines;
import org.activiti.engine.RepositoryService;
import org.activiti.engine.repository.DeploymentBuilder;

public class ZipTest {

    public static void main(String[] args) throws Exception {
        ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
        // 存储服务
        RepositoryService rs = engine.getRepositoryService();
        
        DeploymentBuilder builder = rs.createDeployment();
        
        FileInputStream fis = new FileInputStream(new File("resource/datas.zip"));
        ZipInputStream zis = new ZipInputStream(fis);
        
        builder.addZipInputStream(zis);
        
        builder.deploy();
    }

}

方法addBpmnModel:

package com.wjy.deploy;

import org.activiti.bpmn.model.BpmnModel;
import org.activiti.bpmn.model.EndEvent;
import org.activiti.bpmn.model.SequenceFlow;
import org.activiti.bpmn.model.StartEvent;
import org.activiti.bpmn.model.UserTask;
import org.activiti.engine.ProcessEngine;
import org.activiti.engine.ProcessEngines;
import org.activiti.engine.RepositoryService;
import org.activiti.engine.repository.DeploymentBuilder;

public class BpmnTest {

    public static void main(String[] args) {
        ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
        // 存储服务
        RepositoryService rs = engine.getRepositoryService();
        
        DeploymentBuilder builder = rs.createDeployment();
        builder.addBpmnModel("My Process", createProcessModel());
        
        builder.deploy();
    }
    
    private static BpmnModel createProcessModel() {
        // 创建BPMN模型对象
        BpmnModel model = new BpmnModel();
        // 创建一个流程定义
        org.activiti.bpmn.model.Process process = new org.activiti.bpmn.model.Process();
        model.addProcess(process);
        process.setId("myProcess");
        process.setName("My Process");
        // 开始事件
        StartEvent startEvent = new StartEvent();
        startEvent.setId("startEvent");
        process.addFlowElement(startEvent);
        // 用户任务
        UserTask userTask = new UserTask();
        userTask.setName("User Task");
        userTask.setId("userTask");
        process.addFlowElement(userTask);
        // 结束事件
        EndEvent endEvent = new EndEvent();
        endEvent.setId("endEvent");
        process.addFlowElement(endEvent);
        // 添加流程顺序
        process.addFlowElement(new SequenceFlow("startEvent", "userTask"));
        process.addFlowElement(new SequenceFlow("userTask", "endEvent"));
        return model;
    }


}

方法addString和addBytes:略

上面的方法是加载流程方法，另外方法deploy是将加载的流程实现部署，返回对象Deployment，部署记录记录到表表：act_re_deployment，流程则记录到表：act_ge_bytearray。

【Activiti学习之二】Activiti API

标签：字段排序 stl rgs div valueof field data 返回 single

原文地址：https://www.cnblogs.com/cac2020/p/11498547.html

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