Activiti工作流与spring集成

一.前言

      前面Activiti工作流的学习，说明了Activiti的基本应用，在我们开发中可以根据实际的业务参考Activiti的API去更好的理解以及巩固。我们实际的开发中我们基本上都使用spring框架进行开发，现在来说明一下Activiti工作流与spring集成，Activiti工作流与spring集成还算比较简单，可以参考Activiti的API来进行整合。

二.Activiti常用的表

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---------------------------------------------部署对象和流程定义相关的表---------------------------------------------
 
--部署对象信息表
SELECT T.*, T.ROWID FROM ACT_RE_DEPLOYMENT T;
 
--流程定义表
--ID_ 由KEY_ + VERSION_ + 随机生成是数组成
SELECT T.*, T.ROWID FROM ACT_RE_PROCDEF T where t.category_='1' order by t.version_ asc;
 
--资源文件表
SELECT T.*, T.ROWID FROM ACT_GE_BYTEARRAY T;
 
--主键生成策略表
SELECT T.*, T.ROWID FROM ACT_GE_PROPERTY T;
 
------------------------------------------流程实例、执行对象、任务------------------------------------------------
 
--正在执行的执行对象表
-- 执行ID_ 56  流程实例ID_ 56  流程定义ID_ _3701622B-4133-7B3D-F50F-E14B4F21E847:1:55  正在运行的任务定义ID_ 【可变】 USERTASKE736BEF8-4133-7B3D-F510-7B2DE7BEA8C6
SELECT T.*, T.ROWID FROM ACT_RU_EXECUTION T;
 
--流程实例历史表 开始信息
--历史流程定义ID_ 56 流程S实例ID_ 56 业务KEY_10000001 流程定义ID_ _3701622B-4133-7B3D-F50F-E14B4F21E847:1:55 开始任务节点ID_ STARTEVENT52B3145F-C133-7B3D-F50F-E6D48BA60EAE
SELECT T.*, T.ROWID FROM ACT_HI_PROCINST T;
 
--正在执行的任务对象表
--任务ID_ 68  执行ID_ 56  流程实例ID_ 56  流程定义ID_ _3701622B-4133-7B3D-F50F-E14B4F21E847:1:55  任务节点ID_ USERTASKE736BEF8-4133-7B3D-F510-7B2DE7BEA8C6
SELECT T.*, T.ROWID FROM ACT_RU_TASK T;
 
--历史任务流程实例信息
--历史任务ID_ 68   流程实例ID_ 56  执行实例ID_ 56   流程定义ID_ _3701622B-4133-7B3D-F50F-E14B4F21E847:1:55  任务节点ID_ USERTASKE736BEF8-4133-7B3D-F510-7B2DE7BEA8C6   表单KEY_ /PAGES/HOLIDAY/HOLIDAYMANAGE/HOLIDAYFORMHANDLE.JSP
--历史任务ID_ 74   流程实例ID_ 56  执行实例ID_ 56  流程定义ID_ _3701622B-4133-7B3D-F50F-E14B4F21E847:1:55  任务节点ID_ USERTASK04A84BE1-1133-7B3D-F511-1D0B7BB0A668   表单KEY_ /PAGES/HOLIDAY/HOLIDAYMANAGE/HOLIDAYFORMVIEW.JSP
SELECT T.*, T.ROWID FROM ACT_HI_TASKINST T;
 
--所有活动节点历史任务表
--历史任务ID_58 流程定义ID_ _3701622B-4133-7B3D-F50F-E14B4F21E847:1:55 流程实例ID_ 56  流程执行ID_ 56  任务节点ID_ STARTEVENT52B3145F-C133-7B3D-F50F-E6D48BA60EAE
--历史任务ID_67 流程定义ID_ _3701622B-4133-7B3D-F50F-E14B4F21E847:1:55 流程实例ID_ 56  流程执行ID_ 56  任务节点ID_ USERTASKE736BEF8-4133-7B3D-F510-7B2DE7BEA8C6   任务ID_ 68
--历史任务ID_73 流程定义ID_ _3701622B-4133-7B3D-F50F-E14B4F21E847:1:55 流程实例ID_ 56  流程执行ID_ 56  任务节点ID_ USERTASK04A84BE1-1133-7B3D-F511-1D0B7BB0A668   任务ID_ 74
SELECT T.*, T.ROWID FROM ACT_HI_ACTINST T;
 
----------------------------------------流程变量信息--------------------------------------------------
--正在执行的流程变量信息
SELECT T.*, T.ROWID FROM ACT_RU_VARIABLE T;
 
--历史流程变量信息 存放历史表单重要信息
--流程实例ID_ 56  执行实例ID_ 56 任务ID_
SELECT T.*, T.ROWID FROM ACT_HI_VARINST T;
 
 
-------------------------------------------历史意见信息-----------------------------------------------
 
--历史审批意见表
--任务ID_ 68  流程定义ID_ 56 
SELECT T.*, T.ROWID FROM ACT_HI_COMMENT T;
 
-----------------------------------------节点参与者信息-------------------------------------------------
--任务办理人表（个人任务、组任务）
SELECT T.*, T.ROWID FROM ACT_RU_IDENTITYLINK T;
 
--历史任务办理人表（个人任务、组任务）
SELECT T.*, T.ROWID FROM ACT_HI_IDENTITYLINK T;
 
--临时对象
SELECT T.*, T.ROWID FROM EA_IST.IST_APPR_BUSI_DATA T

三.Activiti与spring整合xml配置文件

向spring配置文件中，添加一个spring-workflow2-activiti.xml配置文件，里面如下：

复制代码
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-2.5.xsd">

    <!--工作流引擎配置 -->
    <bean id="processEngineConfiguration" class="com.shine.workflow2.spring.ShineSpringProcessEngineConfiguration">
        <property name="dataSource" ref="dataSource" />
        <property name="transactionManager" ref="transactionManager" />
        <property name="databaseSchemaUpdate" value="false" />
        <property name="jobExecutorActivate" value="false" />
         <!-- 组织机构适配  -->
        <property name="organizationConnector"  ref="organizationAdapter" />

     </bean>
     
      <!-- 组织机构适配实现  -->
     <bean id="organizationAdapter" class="com.shine.workflow2.organization.impl.OrganizationAdapter" />

    <!--工作流引擎 -->
    <bean id="processEngine" class="com.shine.workflow2.spring.ShineProcessEngineFactoryBean"> 
        <property name="processEngineConfiguration" ref="processEngineConfiguration" />
    </bean>
    
    
    <!--扩展服务 -->
    <bean id="processDefinitionService" factory-bean="processEngine"
        factory-method="getProcessDefinitionService" />
    <bean id="processLogService" factory-bean="processEngine"
        factory-method="getProcessLogService" />
    <bean id="processManagementService" factory-bean="processEngine"
        factory-method="getProcessManagementService" />
    
    <!--原生服务 -->
    <bean id="repositoryService" factory-bean="processEngine"
        factory-method="getRepositoryService" />
    <bean id="runtimeService" factory-bean="processEngine"
        factory-method="getRuntimeService" />
    <bean id="taskService" factory-bean="processEngine"
        factory-method="getTaskService" />
    <bean id="historyService" factory-bean="processEngine"
        factory-method="getHistoryService" />
    <bean id="managementService" factory-bean="processEngine"
        factory-method="getManagementService" />
    <bean id="formService" factory-bean="processEngine"
        factory-method="getFormService" />
    <bean id="identityService" factory-bean="processEngine"
        factory-method="getIdentityService" />
    
</beans>
复制代码

四.Activiti工作流常用service　

  1.BaseProcessService

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/**
 *
 */
package com.shine.eosp.workflow2.common.process;
 
import org.activiti.engine.impl.persistence.entity.ProcessDefinitionEntity;
import org.activiti.engine.impl.pvm.PvmActivity;
import org.activiti.engine.impl.pvm.process.ActivityImpl;
import org.activiti.engine.impl.task.TaskDefinition;
import org.activiti.engine.repository.ProcessDefinition;
import org.activiti.engine.runtime.Execution;
import org.activiti.engine.runtime.ProcessInstance;
import org.activiti.engine.task.Task;
 
import com.shine.workflow2.exception.WorkflowException;
 
/**
 *
 * 类说明: 常用工作流核心操作封装 .
 *
 * <pre>
 * 修改日期          修改人              修改原因
 * 2016-6-2     hongwz         新建
 * </pre>
 */
public interface BaseProcessService {
     
     
    /**
     * 方法说明 ： 根据流程定义Key查询最新流程定义.
     *
     * @param processDefinitionKey
     * @throws WorkflowException
     */
    public ProcessDefinition findLatestProcessDefinitionByPrcDefKey(String processDefinitionKey) throws WorkflowException;
     
    /**
     * 方法说明 ： 根据流程定义Id查询流程定义.
     *
     * @param processDefinitionId  流程定义Id
     * @throws WorkflowException
     */
    public ProcessDefinitionEntity findProcessDefinitionEntityByProcDefId(String processDefinitionId) throws WorkflowException;
         
    /**
     *
     * 方法说明  ： 根据流程实例Id查询流程实例.
     *
     * @param processInstanceId 流程实例Id
     * @return
     * @throws WorkflowException
     */
    public ProcessInstance findProcessInstanceByProcInst(String processInstanceId) throws WorkflowException;
     
    /**
     * 根据流程实例Id查询流程实例.
     *
     * @param processInstanceId
     * @throws WorkflowException
     */
    public Execution findExecutionByProcInst(String processInstanceId) throws WorkflowException;
     
    /**
     * 方法说明 ： 根据流程实例Id查询任务.
     *
     * @param processInstanceId 流程实例Id
     * @throws WorkflowException
     */
    public Task findTaskByProcInstId(String processInstanceId) throws WorkflowException;
     
    /**
     * 方法说明 ： 根据实例Id查询任务.
     *
     * @param executionId 实例Id
     * @throws WorkflowException
     */
    public Task findTaskByExecutionId(String executionId) throws WorkflowException;
     
    /**
     * 方法说明 ： 根据活动节点查询任务定义.
     *
     * @param activityImpl  活动节点
     * @throws WorkflowException
     */
    public TaskDefinition findTaskDefinitionByActivityImpl(ActivityImpl activityImpl) throws WorkflowException;
     
    /**
     * 方法说明 : 查询上一个节点.
     *
     * @param activityImpl 活动节点
     * @param activityId 当前活动节点ID 
     * @param elString
     * @throws ShineException
     */
    public TaskDefinition beforeTaskDefinition(ActivityImpl activityImpl,String activityId, String elString) throws WorkflowException;
     
    /**
     * 方法说明 : 查询下一个节点.
     *
     * @param activityImpl 活动节点
     * @param activityId 当前活动节点ID 
     * @param elString
     * @throws ShineException
     */
    public TaskDefinition nextTaskDefinition(ActivityImpl activityImpl,String activityId, String elString) throws WorkflowException;
 
    /**
     * 方法说明： 根据活动节点、活动线路查询线路的连接线.
     *
     * @throws WorkflowException
     */
    public PvmActivity findPvmActivity(ActivityImpl activityImpl, String transitions) throws WorkflowException;
     
    /**
     * 方法说明 ：根据流程定义Id查询任务定义
     *
     * @param processDefinitionId 流程定义Id
     * @return
     * @throws WorkflowException
     */
    public TaskDefinition findTaskDefinition(String processDefinitionId) throws WorkflowException;
     
    /**
     * 方法说明 ： 添加任务意见.
     *
     * @param taskId      任务Id
     * @param processInstanceId   流程实例Id
     * @param comment     意见
     * @throws WorkflowException
     */
    public void addTaskComment(String taskId, String processInstanceId, String comment) throws WorkflowException;
     
    /**
     * 方法说明 ： 拾取任务.
     *
     * @param taskId  任务Id
     * @param operator 办理人
     * @throws WorkflowException
     */
    public void claimTask(String taskId, String operator) throws WorkflowException;
     
    /**
     * 方法说明 ： 根据流程定义Id查询最新流程定义.
     *
     * @param processDefinitionId 流程定义Id
     * @return
     * @throws WorkflowException
     */
    public ProcessDefinition findProcessDefinitionByPrcDefId(String processDefinitionId) throws WorkflowException;
}

2.BaseProcessServiceImpl

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/**
 *
 */
package com.shine.eosp.workflow2.common.process;
 
import java.util.Iterator;
import java.util.List;
 
import org.activiti.engine.HistoryService;
import org.activiti.engine.RepositoryService;
import org.activiti.engine.RuntimeService;
import org.activiti.engine.TaskService;
import org.activiti.engine.impl.RepositoryServiceImpl;
import org.activiti.engine.impl.bpmn.behavior.UserTaskActivityBehavior;
import org.activiti.engine.impl.persistence.entity.ProcessDefinitionEntity;
import org.activiti.engine.impl.pvm.PvmActivity;
import org.activiti.engine.impl.pvm.PvmTransition;
import org.activiti.engine.impl.pvm.process.ActivityImpl;
import org.activiti.engine.impl.task.TaskDefinition;
import org.activiti.engine.repository.ProcessDefinition;
import org.activiti.engine.runtime.Execution;
import org.activiti.engine.runtime.ProcessInstance;
import org.activiti.engine.task.Task;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
 
import com.shine.util.CollectionUtil;
import com.shine.workflow2.exception.WorkflowException;
 
/**
 *
 * 类说明: 常用工作流核心操作封装 .
 *
 * <pre>
 * 修改日期          修改人              修改原因
 * 2016-6-2     hongwz         新建
 * </pre>
 */
public class BaseProcessServiceImpl implements BaseProcessService {
     
    /**
     * log.
     */
    private static Logger logger = LoggerFactory.getLogger(BaseProcessServiceImpl.class);
        
    @Autowired
    private RepositoryService repositoryService;
     
    @Autowired
    private RuntimeService runtimeService;
     
    @Autowired
    private TaskService taskService;
     
    @Autowired
    private HistoryService historyService;
     
    /**
     * 方法说明 ： 根据流程定义Key查询最新流程定义.
     *
     * @param processDefinitionKey  流程定义Key
     * @return
     * @throws WorkflowException
     */
    @Override
    public ProcessDefinition findLatestProcessDefinitionByPrcDefKey(String processDefinitionKey) throws WorkflowException{
         
        ProcessDefinition processDefinition = repositoryService.createProcessDefinitionQuery()
                                                               .processDefinitionKey(processDefinitionKey)
                                                               .latestVersion()
                                                               .singleResult();
        return processDefinition;
                                 
    }
     
    /**
     * 方法说明 ： 根据流程定义Id查询最新流程定义.
     *
     * @param processDefinitionId 流程定义Id
     * @return
     * @throws WorkflowException
     */
    @Override
    public ProcessDefinition findProcessDefinitionByPrcDefId(String processDefinitionId) throws WorkflowException{
        ProcessDefinition processDefinition = repositoryService.createProcessDefinitionQuery()
                .processDefinitionId(processDefinitionId)
                .orderByProcessDefinitionVersion()
                .desc()
                .singleResult();
         
        return processDefinition;
    }
     
    /**
     * 方法说明 ： 根据流程定义Id查询流程定义.
     *
     * @param processDefinitionId  流程定义Id
     * @return 
     * @throws WorkflowException
     */
    @Override
    public ProcessDefinitionEntity findProcessDefinitionEntityByProcDefId(String processDefinitionId) throws WorkflowException{
         
        ProcessDefinitionEntity processDefinitionEntity  = (ProcessDefinitionEntity) ((RepositoryServiceImpl) repositoryService)
                                                                  .getDeployedProcessDefinition(processDefinitionId);
        return processDefinitionEntity;
    }
     
    /**
     *
     * 方法说明  ： 根据流程实例Id查询流程实例.
     *
     * @param processInstanceId 流程实例Id
     * @return
     * @throws WorkflowException
     */
    @Override
    public ProcessInstance findProcessInstanceByProcInst(String processInstanceId) throws WorkflowException{
        return runtimeService.createProcessInstanceQuery()
                             .processInstanceId(processInstanceId)
                             .singleResult();
    }
     
     
    /**
     * 根据流程实例Id查询流程实例.
     *
     * @param processInstanceId
     * @return
     * @throws WorkflowException
     */
    @Override
    public Execution findExecutionByProcInst(String processInstanceId) throws WorkflowException{
        return runtimeService.createExecutionQuery().processInstanceId(processInstanceId).singleResult();
    }
     
    /**
     * 方法说明 ： 根据流程实例Id查询任务.
     *
     * @param processInstanceId 流程实例Id
     * @return
     * @throws WorkflowException
     */
    @Override
    public Task findTaskByProcInstId(String processInstanceId) throws WorkflowException{
        return taskService.createTaskQuery().processInstanceId(processInstanceId).singleResult();
    }
     
    /**
     * 方法说明 ： 根据实例Id查询任务.
     *
     * @param executionId 实例Id
     * @return
     * @throws WorkflowException
     */
    @Override
    public Task findTaskByExecutionId(String executionId) throws WorkflowException{
        return taskService.createTaskQuery().executionId(executionId).singleResult();
    }
     
    /**
     * 方法说明 ： 根据活动节点查询任务定义.
     *
     * @param activityImpl  活动节点
     * @return
     * @throws WorkflowException
     */
    @Override
    public TaskDefinition findTaskDefinitionByActivityImpl(ActivityImpl activityImpl) throws WorkflowException{
          return ((UserTaskActivityBehavior)activityImpl.getActivityBehavior()).getTaskDefinition(); 
    }
     
    /**
     * 方法说明 : 查询上一个节点.
     *
     * @param activityImpl 活动节点
     * @param activityId 当前活动节点ID 
     * @param elString
     * @return
     * @throws ShineException
     */
    @Override
    public TaskDefinition beforeTaskDefinition(ActivityImpl activityImpl,String activityId, String elString) throws WorkflowException {
        if("userTask".equals(activityImpl.getProperty("type")) && !activityId.equals(activityImpl.getId())){ 
            TaskDefinition taskDefinition = null;
            if(activityImpl != null){
                taskDefinition = findTaskDefinitionByActivityImpl(activityImpl);
            }
            return taskDefinition;
        }else{ 
            List<PvmTransition> inTransitions = activityImpl.getIncomingTransitions();   //通过活动节点查询所有线路
            if(!CollectionUtil.isEmpty(inTransitions)){
                List<PvmTransition> inTransitionsTemp = null; 
                for(PvmTransition tr:inTransitions){   
                    PvmActivity ac = tr.getSource();      //获取线路的前节点   
                    if("exclusiveGateway".equals(ac.getProperty("type"))){ 
                        inTransitionsTemp = ac.getIncomingTransitions(); 
                        if(inTransitionsTemp.size() == 1){ 
                            return beforeTaskDefinition((ActivityImpl)inTransitionsTemp.get(0).getSource(), activityId, elString); 
                        }else if(inTransitionsTemp.size() > 1){ 
                            for(PvmTransition tr1 : inTransitionsTemp){ 
                                Object s = tr1.getProperty("conditionText"); 
                                if(elString.equals(StringUtils.replacePattern(StringUtils.trim(s.toString()), " ", ""))){ 
                                    return beforeTaskDefinition((ActivityImpl)tr1.getSource(), activityId, elString); 
                                } 
                            } 
                        } 
                    }
                }
            }
            return null; 
        } 
    }
     
     
    /**
     * 方法说明 : 查询下一个节点.
     *
     * @param activityImpl 活动节点
     * @param activityId 当前活动节点ID 
     * @param elString
     * @return
     * @throws ShineException
     */
    @Override
    public TaskDefinition nextTaskDefinition(ActivityImpl activityImpl,String activityId, String elString) throws WorkflowException {
         
        if("userTask".equals(activityImpl.getProperty("type")) && !activityId.equals(activityImpl.getId())){ 
            TaskDefinition taskDefinition = null;
            if(activityImpl != null){
                taskDefinition = findTaskDefinitionByActivityImpl(activityImpl);
            }
            return taskDefinition;
        }else{
            List<PvmTransition> outTransitions = activityImpl.getOutgoingTransitions();   //通过活动节点查询所有线路
            if(!CollectionUtil.isEmpty(outTransitions)){
                List<PvmTransition> outTransitionsTemp = null; 
                for(PvmTransition tr:outTransitions){  
                    PvmActivity ac = tr.getDestination();         //获取线路的终点节点   
                    if("exclusiveGateway".equals(ac.getProperty("type"))){ 
                        outTransitionsTemp = ac.getOutgoingTransitions(); 
                        if(outTransitionsTemp.size() == 1){ 
                            return nextTaskDefinition((ActivityImpl)outTransitionsTemp.get(0).getDestination(), activityId, elString); 
                        }else if(outTransitionsTemp.size() > 1){ 
                            for(PvmTransition tr1 : outTransitionsTemp){ 
                                Object s = tr1.getProperty("conditionText"); 
                                if(s != null && elString.equals(StringUtils.replacePattern(StringUtils.trim(s.toString()), " ", ""))){ 
                                    return nextTaskDefinition((ActivityImpl)tr1.getDestination(), activityId, elString); 
                                } 
                            } 
                        } 
                    }else if("userTask".equals(ac.getProperty("type"))){ 
                        return findTaskDefinitionByActivityImpl((ActivityImpl)ac);
                    }
                    else if("startEvent".equals(ac.getProperty("type"))){ 
                        return findTaskDefinitionByActivityImpl((ActivityImpl)ac);
                    }
                    else{ 
                        logger.info(ac.getProperty("type").toString()); 
                    } 
                }
            }
            return null; 
        }
     
    }
     
    /**
     * 方法说明： 根据活动节点、活动线路查询线路的连接线.
     *
     * @return
     * @throws WorkflowException
     */
    @SuppressWarnings("rawtypes")
    @Override
    public PvmActivity findPvmActivity(ActivityImpl activityImpl, String transitions) throws WorkflowException{
         
        PvmActivity activity = null;
        List<PvmTransition> pvmTransitions = activityImpl.getOutgoingTransitions();   //获取所有线路
         
        for (Iterator iterator = pvmTransitions.iterator(); iterator.hasNext();) {
                PvmTransition pvmTransition = (PvmTransition) iterator.next();
                PvmActivity pvmActivity = pvmTransition.getDestination();           //获取下一个任务节点
                String transitionsVal = (String) pvmActivity.getProperty("name");
                if(transitions.equals(transitionsVal)){
                    activity = pvmActivity;
                    break;
                }
        }
        return activity;
    }
     
    /**
     * 方法说明 ：根据流程定义Id查询任务定义
     *
     * @param processDefinitionId 流程定义Id
     * @return
     * @throws WorkflowException
     */
    @Override
    public TaskDefinition findTaskDefinition(String processDefinitionId) throws WorkflowException{
         
        //获取流程定义
        ProcessDefinitionEntity processDefinitionEntity = findProcessDefinitionEntityByProcDefId(processDefinitionId);
        TaskDefinition tdf = null;
         
        if(processDefinitionEntity != null){
            List<ActivityImpl> activityImpls = processDefinitionEntity.getActivities();    //获取所有活动的节点
            for(int i = activityImpls.size() - 1; i > 0; i-- ){
                ActivityImpl activityImpl = activityImpls.get(i);    
                String startEventType = (String) activityImpl.getProperty("type");
                if("startEvent".equals(startEventType)){
                    tdf = nextTaskDefinition(activityImpl, activityImpl.getId(), null);
                }
            }  
        }
        return tdf;
    }
     
    /**
     * 方法说明 ： 添加任务意见.
     *
     * @param taskId      任务Id
     * @param processInstanceId   流程实例Id
     * @param comment     意见
     * @throws WorkflowException
     */
    @Override
    public void addTaskComment(String taskId,String processInstanceId,String comment) throws WorkflowException{
         taskService.addComment(taskId, processInstanceId, comment);
    }
     
    /**
     * 方法说明 ： 拾取任务.
     *
     * @param taskId  任务Id
     * @param operator 办理人
     * @throws WorkflowException
     */
    @Override
    public void claimTask(String taskId,String operator) throws WorkflowException{
         taskService.claim(taskId, operator);
    }
}

 

引用原文：http://www.cnblogs.com/hongwz/p/5548473.html

 

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posted @ 2018-04-30 18:06  緈諨の約錠  阅读(285)  评论(0)  编辑  收藏  举报
//用户复制动作发生0.1秒以后再去改粘贴板中的内容。100ms只是一个经常取值，写1000、10、50、200……都行。