update：这个例子是不当的，更合适的例子请自己上javaeye上搜索个帖子。源码俺早就丢了，请不要再发邮件给我，谢谢。
osworkflow扩展非常容易，跟我们的应用结合起来使用也很容易。假设一个请假流程：员工请假，需要经过部门经理和人力资源部经理两人共同审批，只有当两人都许可时才通过，任一人驳回就失效，也就是一个and split和and Join流程，并且我们附加一个要求，当发送请假请求、许可和驳回这几个操作时都将发送一条消息给相应的用户。
流程定义文件如下：
请注意，我们在许可或者通过的时候 propertySet.setString("action2",......)， propertySet.setString("action3",......) ，然后在join点判断，如果两个都是success，流程结束；如果一个是fail，就发送一个消息给员工。
发送消息的function像这样：
得到两个参数groupName和content(消息内容）,调用业务对象发送消息。
完整代码下载在 《LeaveSystem》
代码用到了自己过去写的一个MVC框架和持久层，对此有兴趣的参考这三篇文章：
《设计自己的MVC框架》
《设计模式之事务处理》
《使用Annotation设计持久层》
如果仅仅是想了解osworkflow的应用，建议您跑下流程，读读相关几个业务类（LeaveServiceImpl.java,SendRemindInfFunction.java,service包下）即可。解压缩后的文件可以直接导入myeclipse工程，部署在tomcat下，数据库用的是oracle。跑起来以后可以用3个用户登录，test是雇员组，dennis是部门经理组，jordan是公司经理，都不需要密码。写的比较简单，只是实验性质，见谅。
我认为使用osworkflow，只要了解了它的表结构和主要原理，根据你的业务需要结合几张主要表（os_wfentry,os_currentstep,os_historystep等）合理设计数据库和业务流程，可以省去过去为每个业务流程对象创建的一大堆flag（标志，目前的流程状态）的累赘，充分利用工作流的威力。比如为部门经理和人力资源部经理显示不同的需要审批的假单列表，只要结合os_historystep表进行联合查询，部门经理的应该是执行了未执行acion2,step在3的；而人力资源部经理得到的同样是step在3，action未执行3的。
手痒痒，很想把去年为一家公司写的绩效考核系统改写一下，当时设计的一个contract对象拥有7，8个flag来标志合约状态(直接上级审核，人力资源评价，KPI评价等），搞的非常混乱，而且流程写死在代码里，如果以后要改变考核流程，只有重新写过一套。不过那家公司是国有企业，每年的固定的预算费用一定要花掉，反正大家一起赚国家的钱嘛。
osworkflow扩展非常容易，跟我们的应用结合起来使用也很容易。假设一个请假流程：员工请假，需要经过部门经理和人力资源部经理两人共同审批，只有当两人都许可时才通过，任一人驳回就失效，也就是一个and split和and Join流程，并且我们附加一个要求，当发送请假请求、许可和驳回这几个操作时都将发送一条消息给相应的用户。
流程定义文件如下：
<?
xml version="1.0" encoding="UTF-8"
?>
<! DOCTYPE workflow PUBLIC "-//OpenSymphony Group//DTD OSWorkflow 2.7//EN"
"http://www.opensymphony.com/osworkflow/workflow_2_7.dtd" >
< workflow >
< initial-actions >
< action id ="0" name ="开始" >
< pre-functions >
< function type ="class" >
< arg name ="class.name" >
com.opensymphony.workflow.util.Caller
</ arg >
</ function >
</ pre-functions >
< results >
< unconditional-result old-status ="Finished"
status ="Underway" step ="1" owner ="${caller}" />
</ results >
</ action >
</ initial-actions >
< steps >
< step id ="1" name ="填假单" >
< external-permissions >
< permission name ="permA" >
< restrict-to >
< conditions type ="AND" >
< condition type ="class" > <!-- 流程处于Underway状态(流程已经启动) -->
< arg name ="class.name" >
com.opensymphony.workflow.util.StatusCondition
</ arg >
< arg name ="status" > Underway </ arg >
</ condition >
< condition type ="class" >
< arg name ="class.name" >
com.opensymphony.workflow.util.AllowOwnerOnlyCondition
</ arg >
</ condition >
</ conditions >
</ restrict-to >
</ permission >
</ external-permissions >
< actions >
< action id ="1" name ="送出" >
< restrict-to >
< conditions type ="AND" >
< condition type ="class" > <!-- 流程处于Underway状态(流程已经启动) -->
< arg name ="class.name" >
com.opensymphony.workflow.util.StatusCondition
</ arg >
< arg name ="status" > Underway </ arg >
</ condition >
< condition type ="class" >
< arg name ="class.name" >
com.opensymphony.workflow.util.AllowOwnerOnlyCondition
</ arg >
</ condition >
</ conditions >
</ restrict-to >
< pre-functions >
< function type ="class" >
< arg name ="class.name" >
com.opensymphony.workflow.util.Caller
</ arg >
</ function >
</ pre-functions >
< results >
< unconditional-result old-status ="Finished"
split ="1" status ="Queued" >
< post-functions >
< function type ="class" >
< arg name ="class.name" >
net.rubyeye.leavesys.service.workflow.SendRemindInfFunction
</ arg >
< arg name ="groupName" >
AND (GROUPNAME='dept_manager' or
GROUPNAME='comp_manager')
</ arg >
< arg name ="content" >
you have leavemsg to
check!please check it!
</ arg >
</ function >
</ post-functions >
</ unconditional-result >
</ results >
</ action >
</ actions >
</ step >
< step id ="2" name ="部门经理批假单" >
< actions >
< action id ="2" name ="准许" >
< restrict-to >
< conditions >
< condition type ="class" >
< arg name ="class.name" >
com.opensymphony.workflow.util.OSUserGroupCondition
</ arg >
< arg name ="group" > dept_manager </ arg >
</ condition >
</ conditions >
</ restrict-to >
< pre-functions >
< function type ="class" >
< arg name ="class.name" >
com.opensymphony.workflow.util.Caller
</ arg >
</ function >
< function type ="beanshell" >
< arg name ="script" >
propertySet.setString("action1",
"success");
</ arg >
</ function >
</ pre-functions >
< results >
< unconditional-result old-status ="Finished"
status ="Queued" join ="1" owner ="${caller}" />
</ results >
</ action >
< action id ="3" name ="驳回" >
< restrict-to >
< conditions >
< condition type ="class" >
< arg name ="class.name" >
com.opensymphony.workflow.util.OSUserGroupCondition
</ arg >
< arg name ="group" > dept_manager </ arg >
</ condition >
</ conditions >
</ restrict-to >
< pre-functions >
< function type ="class" >
< arg name ="class.name" >
com.opensymphony.workflow.util.Caller
</ arg >
</ function >
< function type ="beanshell" >
< arg name ="script" >
propertySet.setString("action1",
"fail");
</ arg >
</ function >
</ pre-functions >
< results >
< unconditional-result old-status ="Finished"
status ="Queued" join ="2" owner ="${caller}" />
</ results >
</ action >
</ actions >
</ step >
< step id ="3" name ="公司经理批假单" >
< actions >
< action id ="4" name ="准许" >
< restrict-to >
< conditions >
< condition type ="class" >
< arg name ="class.name" >
com.opensymphony.workflow.util.OSUserGroupCondition
</ arg >
< arg name ="group" > comp_manager </ arg >
</ condition >
</ conditions >
</ restrict-to >
< pre-functions >
< function type ="class" >
< arg name ="class.name" >
com.opensymphony.workflow.util.Caller
</ arg >
</ function >
< function type ="beanshell" >
< arg name ="script" >
propertySet.setString("action2",
"success");
</ arg >
</ function >
</ pre-functions >
< results >
< unconditional-result old-status ="Finished"
status ="Queued" join ="1" owner ="${caller}" />
</ results >
</ action >
< action id ="5" name ="驳回" >
< restrict-to >
< conditions >
< condition type ="class" >
< arg name ="class.name" >
com.opensymphony.workflow.util.OSUserGroupCondition
</ arg >
< arg name ="group" > dept_manager </ arg >
</ condition >
</ conditions >
</ restrict-to >
< pre-functions >
< function type ="class" >
< arg name ="class.name" >
com.opensymphony.workflow.util.Caller
</ arg >
</ function >
< function type ="beanshell" >
< arg name ="script" >
propertySet.setString("action2",
"fail");
</ arg >
</ function >
</ pre-functions >
< results >
< unconditional-result old-status ="Finished"
status ="Queued" join ="2" owner ="${caller}" />
</ results >
</ action >
</ actions >
</ step >
< step id ="4" name ="停止" />
</ steps >
< splits >
< split id ="1" >
< unconditional-result old-status ="Finished" status ="Queued"
step ="2" />
< unconditional-result old-status ="Finished" status ="Queued"
step ="3" />
</ split >
</ splits >
< joins >
< join id ="1" >
< conditions type ="AND" >
< condition type ="beanshell" >
< arg name ="script" >
<![CDATA[
"Finished".equals(jn.getStep(2).getStatus()) &&
"Finished".equals(jn.getStep(3).getStatus())&&"success".equals(propertySet.getString("action1"))&&
"success".equals(propertySet.getString("action2"))
]]>
</ arg >
</ condition >
</ conditions >
< unconditional-result old-status ="Finished" status ="Queued"
step ="4" />
</ join >
< join id ="2" >
< conditions type ="OR" >
< condition type ="beanshell" >
< arg name ="script" >
<![CDATA[
"Finished".equals(jn.getStep(2).getStatus()) &&"fail".equals(propertySet.getString("action1"))
]]>
</ arg >
</ condition >
< condition type ="beanshell" >
< arg name ="script" >
<![CDATA[
"Finished".equals(jn.getStep(3).getStatus())&&"fail".equals(propertySet.getString("action2"))
]]>
</ arg >
</ condition >
</ conditions >
< unconditional-result old-status ="Finished" step ="4"
status ="Queued" >
< post-functions >
< function type ="class" >
< arg name ="class.name" >
net.rubyeye.leavesys.service.workflow.SendRemindInfFunction
</ arg >
< arg name ="groupName" >
AND GROUPNAME='employee'
</ arg >
< arg name ="content" >
you leveamsg is fail!!!
</ arg >
</ function >
</ post-functions >
</ unconditional-result >
</ join >
</ joins >
</ workflow >
<! DOCTYPE workflow PUBLIC "-//OpenSymphony Group//DTD OSWorkflow 2.7//EN"
"http://www.opensymphony.com/osworkflow/workflow_2_7.dtd" >
< workflow >
< initial-actions >
< action id ="0" name ="开始" >
< pre-functions >
< function type ="class" >
< arg name ="class.name" >
com.opensymphony.workflow.util.Caller
</ arg >
</ function >
</ pre-functions >
< results >
< unconditional-result old-status ="Finished"
status ="Underway" step ="1" owner ="${caller}" />
</ results >
</ action >
</ initial-actions >
< steps >
< step id ="1" name ="填假单" >
< external-permissions >
< permission name ="permA" >
< restrict-to >
< conditions type ="AND" >
< condition type ="class" > <!-- 流程处于Underway状态(流程已经启动) -->
< arg name ="class.name" >
com.opensymphony.workflow.util.StatusCondition
</ arg >
< arg name ="status" > Underway </ arg >
</ condition >
< condition type ="class" >
< arg name ="class.name" >
com.opensymphony.workflow.util.AllowOwnerOnlyCondition
</ arg >
</ condition >
</ conditions >
</ restrict-to >
</ permission >
</ external-permissions >
< actions >
< action id ="1" name ="送出" >
< restrict-to >
< conditions type ="AND" >
< condition type ="class" > <!-- 流程处于Underway状态(流程已经启动) -->
< arg name ="class.name" >
com.opensymphony.workflow.util.StatusCondition
</ arg >
< arg name ="status" > Underway </ arg >
</ condition >
< condition type ="class" >
< arg name ="class.name" >
com.opensymphony.workflow.util.AllowOwnerOnlyCondition
</ arg >
</ condition >
</ conditions >
</ restrict-to >
< pre-functions >
< function type ="class" >
< arg name ="class.name" >
com.opensymphony.workflow.util.Caller
</ arg >
</ function >
</ pre-functions >
< results >
< unconditional-result old-status ="Finished"
split ="1" status ="Queued" >
< post-functions >
< function type ="class" >
< arg name ="class.name" >
net.rubyeye.leavesys.service.workflow.SendRemindInfFunction
</ arg >
< arg name ="groupName" >
AND (GROUPNAME='dept_manager' or
GROUPNAME='comp_manager')
</ arg >
< arg name ="content" >
you have leavemsg to
check!please check it!
</ arg >
</ function >
</ post-functions >
</ unconditional-result >
</ results >
</ action >
</ actions >
</ step >
< step id ="2" name ="部门经理批假单" >
< actions >
< action id ="2" name ="准许" >
< restrict-to >
< conditions >
< condition type ="class" >
< arg name ="class.name" >
com.opensymphony.workflow.util.OSUserGroupCondition
</ arg >
< arg name ="group" > dept_manager </ arg >
</ condition >
</ conditions >
</ restrict-to >
< pre-functions >
< function type ="class" >
< arg name ="class.name" >
com.opensymphony.workflow.util.Caller
</ arg >
</ function >
< function type ="beanshell" >
< arg name ="script" >
propertySet.setString("action1",
"success");
</ arg >
</ function >
</ pre-functions >
< results >
< unconditional-result old-status ="Finished"
status ="Queued" join ="1" owner ="${caller}" />
</ results >
</ action >
< action id ="3" name ="驳回" >
< restrict-to >
< conditions >
< condition type ="class" >
< arg name ="class.name" >
com.opensymphony.workflow.util.OSUserGroupCondition
</ arg >
< arg name ="group" > dept_manager </ arg >
</ condition >
</ conditions >
</ restrict-to >
< pre-functions >
< function type ="class" >
< arg name ="class.name" >
com.opensymphony.workflow.util.Caller
</ arg >
</ function >
< function type ="beanshell" >
< arg name ="script" >
propertySet.setString("action1",
"fail");
</ arg >
</ function >
</ pre-functions >
< results >
< unconditional-result old-status ="Finished"
status ="Queued" join ="2" owner ="${caller}" />
</ results >
</ action >
</ actions >
</ step >
< step id ="3" name ="公司经理批假单" >
< actions >
< action id ="4" name ="准许" >
< restrict-to >
< conditions >
< condition type ="class" >
< arg name ="class.name" >
com.opensymphony.workflow.util.OSUserGroupCondition
</ arg >
< arg name ="group" > comp_manager </ arg >
</ condition >
</ conditions >
</ restrict-to >
< pre-functions >
< function type ="class" >
< arg name ="class.name" >
com.opensymphony.workflow.util.Caller
</ arg >
</ function >
< function type ="beanshell" >
< arg name ="script" >
propertySet.setString("action2",
"success");
</ arg >
</ function >
</ pre-functions >
< results >
< unconditional-result old-status ="Finished"
status ="Queued" join ="1" owner ="${caller}" />
</ results >
</ action >
< action id ="5" name ="驳回" >
< restrict-to >
< conditions >
< condition type ="class" >
< arg name ="class.name" >
com.opensymphony.workflow.util.OSUserGroupCondition
</ arg >
< arg name ="group" > dept_manager </ arg >
</ condition >
</ conditions >
</ restrict-to >
< pre-functions >
< function type ="class" >
< arg name ="class.name" >
com.opensymphony.workflow.util.Caller
</ arg >
</ function >
< function type ="beanshell" >
< arg name ="script" >
propertySet.setString("action2",
"fail");
</ arg >
</ function >
</ pre-functions >
< results >
< unconditional-result old-status ="Finished"
status ="Queued" join ="2" owner ="${caller}" />
</ results >
</ action >
</ actions >
</ step >
< step id ="4" name ="停止" />
</ steps >
< splits >
< split id ="1" >
< unconditional-result old-status ="Finished" status ="Queued"
step ="2" />
< unconditional-result old-status ="Finished" status ="Queued"
step ="3" />
</ split >
</ splits >
< joins >
< join id ="1" >
< conditions type ="AND" >
< condition type ="beanshell" >
< arg name ="script" >
<![CDATA[
"Finished".equals(jn.getStep(2).getStatus()) &&
"Finished".equals(jn.getStep(3).getStatus())&&"success".equals(propertySet.getString("action1"))&&
"success".equals(propertySet.getString("action2"))
]]>
</ arg >
</ condition >
</ conditions >
< unconditional-result old-status ="Finished" status ="Queued"
step ="4" />
</ join >
< join id ="2" >
< conditions type ="OR" >
< condition type ="beanshell" >
< arg name ="script" >
<![CDATA[
"Finished".equals(jn.getStep(2).getStatus()) &&"fail".equals(propertySet.getString("action1"))
]]>
</ arg >
</ condition >
< condition type ="beanshell" >
< arg name ="script" >
<![CDATA[
"Finished".equals(jn.getStep(3).getStatus())&&"fail".equals(propertySet.getString("action2"))
]]>
</ arg >
</ condition >
</ conditions >
< unconditional-result old-status ="Finished" step ="4"
status ="Queued" >
< post-functions >
< function type ="class" >
< arg name ="class.name" >
net.rubyeye.leavesys.service.workflow.SendRemindInfFunction
</ arg >
< arg name ="groupName" >
AND GROUPNAME='employee'
</ arg >
< arg name ="content" >
you leveamsg is fail!!!
</ arg >
</ function >
</ post-functions >
</ unconditional-result >
</ join >
</ joins >
</ workflow >
请注意，我们在许可或者通过的时候 propertySet.setString("action2",......)， propertySet.setString("action3",......) ，然后在join点判断，如果两个都是success，流程结束；如果一个是fail，就发送一个消息给员工。
发送消息的function像这样：
package
net.rubyeye.leavesys.service.workflow;
import java.sql.SQLException;
import java.util.Map;
import net.rubyeye.leavesys.domain.RemindInf;
import net.rubyeye.leavesys.service.ManagerFactory;
import com.opensymphony.module.propertyset.PropertySet;
import com.opensymphony.workflow.FunctionProvider;
import com.opensymphony.workflow.WorkflowException;
public class SendRemindInfFunction implements FunctionProvider {
public void execute(Map transientVars, Map args, PropertySet ps)
throws WorkflowException {
String groupName = (String) args.get( " groupName " );
String content = (String) args.get( " content " );
RemindInf remindInf = new RemindInf();
remindInf.setContent(content);
try {
ManagerFactory.getRemindService().addRemindInfByGroupName(
groupName, remindInf);
} catch (SQLException e) {
e.printStackTrace();
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
import java.sql.SQLException;
import java.util.Map;
import net.rubyeye.leavesys.domain.RemindInf;
import net.rubyeye.leavesys.service.ManagerFactory;
import com.opensymphony.module.propertyset.PropertySet;
import com.opensymphony.workflow.FunctionProvider;
import com.opensymphony.workflow.WorkflowException;
public class SendRemindInfFunction implements FunctionProvider {
public void execute(Map transientVars, Map args, PropertySet ps)
throws WorkflowException {
String groupName = (String) args.get( " groupName " );
String content = (String) args.get( " content " );
RemindInf remindInf = new RemindInf();
remindInf.setContent(content);
try {
ManagerFactory.getRemindService().addRemindInfByGroupName(
groupName, remindInf);
} catch (SQLException e) {
e.printStackTrace();
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
得到两个参数groupName和content(消息内容）,调用业务对象发送消息。
完整代码下载在 《LeaveSystem》
代码用到了自己过去写的一个MVC框架和持久层，对此有兴趣的参考这三篇文章：
《设计自己的MVC框架》
《设计模式之事务处理》
《使用Annotation设计持久层》
如果仅仅是想了解osworkflow的应用，建议您跑下流程，读读相关几个业务类（LeaveServiceImpl.java,SendRemindInfFunction.java,service包下）即可。解压缩后的文件可以直接导入myeclipse工程，部署在tomcat下，数据库用的是oracle。跑起来以后可以用3个用户登录，test是雇员组，dennis是部门经理组，jordan是公司经理，都不需要密码。写的比较简单，只是实验性质，见谅。
我认为使用osworkflow，只要了解了它的表结构和主要原理，根据你的业务需要结合几张主要表（os_wfentry,os_currentstep,os_historystep等）合理设计数据库和业务流程，可以省去过去为每个业务流程对象创建的一大堆flag（标志，目前的流程状态）的累赘，充分利用工作流的威力。比如为部门经理和人力资源部经理显示不同的需要审批的假单列表，只要结合os_historystep表进行联合查询，部门经理的应该是执行了未执行acion2,step在3的；而人力资源部经理得到的同样是step在3，action未执行3的。
手痒痒，很想把去年为一家公司写的绩效考核系统改写一下，当时设计的一个contract对象拥有7，8个flag来标志合约状态(直接上级审核，人力资源评价，KPI评价等），搞的非常混乱，而且流程写死在代码里，如果以后要改变考核流程，只有重新写过一套。不过那家公司是国有企业，每年的固定的预算费用一定要花掉，反正大家一起赚国家的钱嘛。