关键字:
jbpm 工作流 struts web 应用
一、 环境配置
基础环境是eclipse3+myeclipse6+mysql5+tomcat6 。
首先从网站上下载jBPM开发包(jbpm-jpdl-suite-3.2.3.zip),据说现在jBPM3已经升到3.2.6了,而且据说已经推出了jBPM4了。将jbpm-jpdl-suite-3.2.3.zip解压缩后,里面有个\designer文件夹,这个是eclipse
IDE的jBPM插件,是可视化的那种。
安装这个插件:
1、 Help Software Updates
2、 Find and Install Search for new features to install
3、 点击 New Local Site,选择jBPM开发包解压缩后的那个插件的地址,例如D:\jbpm-jpdl-3.2.3\designer
4、 一路点击Next就可以了,安装完成后,eclipse需要重启。重启后,可以在project中到到一个JBoss
jBPM的项目。如图所示。
二、 设置一个User Library
很多人不习惯Process Project的那种代码结构,而我也不习惯。Process Project
的结构如图所示。
于是想给它设置一个自己的库,可以随时在各种WEB应用中调用。设置User Library的步骤如下:
1、 eclipse中,点击Window Preferences
2、 Java?User Library
3、 点击New,设置User Library name 为jBPM Library。点击OK。
4、 点击Add JARs,首先来到jBPM解压缩后的路径(例如:D:\jbpm-jpdl-3.2.3),有两个JAR,其中jbpm-jpdl.jar是一定要加的。
5、 还有其他的JARs要加,重复步骤4,进入lib包(例如:D:\jbpm-jpdl-3.2.3\lib),选中所有的JARs。
6、 这样,我们的jBPM Library就设置好了。如图所示:
三、 一个结合Struts 1.x的应用
首先,假定一个流程。这个流程是常用的报销流程,只考虑了最简单的流程。
角色有三种:普通员工(employee)、经理(manager)、BOSS(boss)。这里因为只是做个示例,没有考虑过多的权限方面的设置。这里设计了三个用户,分别对应了三种角色,并且员工有上级(经理)无下属、经理有上级(BOSS)有下属(员工)、BOSS无上级有下属(经理)。具体参看数据库设计。
好了,数据设计好了,开始搭建系统吧。步骤如下:
1、 File New Web Project
2、 给新添加的web项目添加Struts 1.x类库。
3、 添加新的User Library,将刚才设置好的jBPM Library添加进来。
4、 在项目下新增一个Source Folder,命名为jbpm。
搭建好的结构如下图所示:
项目的流程定义文件和jBPM插件生成的图片在com.flowdemo.jbpm.expense包下。hibernate.cfg.xml配置文件需要做一些修改,原本配置的数据库连接是hsqldb。现在把它改成为连接MySQL。具体的配置信息查看代码清单。
Com.flowdemo.service包中包含有两个业务逻辑类,一个是关于对象持久化的:PersistenceService.java
一个是工作流的:FlowService.java 。
以下是PersistenceService.java源代码,主要是对持久化对象的一些操作。
Java代码
- package com.flowdemo.service;
-
- import java.util.ArrayList;
- import java.util.List;
-
- import org.hibernate.Query;
- import org.hibernate.Session;
-
- import com.flowdemo.po.Expenses;
- import com.flowdemo.po.Users;
- import com.flowdemo.util.HibernateSessionFactory;
-
- public class PersistenceService {
-
-
-
-
-
- public static void save(Expenses expense){
-
Session hibernateSession = HibernateSessionFactory.getSession();
- try{
-
- hibernateSession.beginTransaction();
-
hibernateSession.saveOrUpdate(expense);
-
hibernateSession.getTransaction().commit();
- }catch(Exception e){
- e.printStackTrace();
- hibernateSession.getTransaction().rollback();
- }finally{
- HibernateSessionFactory.closeSession();
- }
- }
-
-
-
-
-
- public static void update(Expenses expense){
- Session hibernateSession = HibernateSessionFactory.getSession();
- try{
-
- hibernateSession.beginTransaction();
-
- hibernateSession.update(expense);
- hibernateSession.getTransaction().commit();
- }catch(Exception e){
- e.printStackTrace();
- hibernateSession.getTransaction().rollback();
- }finally{
- HibernateSessionFactory.closeSession();
- }
- }
-
-
-
-
-
- public static void delete(Expenses expense){
-
Session hibernateSession = HibernateSessionFactory.getSession();
- try{
-
- hibernateSession.beginTransaction();
- hibernateSession.delete(expense);
-
hibernateSession.getTransaction().commit();
- }catch(Exception e){
- e.printStackTrace();
-
hibernateSession.getTransaction().rollback();
- }finally{
- HibernateSessionFactory.closeSession();
- }
- }
-
-
-
-
-
- public static List<Expenses> getExpenses(){
- Session hibernateSession = HibernateSessionFactory.getSession();
- List<Expenses> expenses = new ArrayList<Expenses>();
- try{
-
-
- hibernateSession.beginTransaction();
-
- Query query = hibernateSession.createQuery("from Expenses");
- expenses = query.list();
- hibernateSession.getTransaction().commit();
-
- }catch(Exception e){
- e.printStackTrace();
- hibernateSession.getTransaction().rollback();
- }finally{
- HibernateSessionFactory.closeSession();
- }
- return expenses;
- }
-
-
-
-
-
-
- public static Users getUserById(String userId){
-
Session hibernateSession = HibernateSessionFactory.getSession();
- Users user = new Users();
- try{
- hibernateSession.beginTransaction();
-
user = (Users)hibernateSession.get(Users.class, userId);
-
hibernateSession.getTransaction().commit();
-
- }catch(Exception e){
- e.printStackTrace();
-
hibernateSession.getTransaction().rollback();
- }finally{
-
HibernateSessionFactory.closeSession();
- }
- return user;
- }
-
-
-
-
-
-
- public static boolean checkUser(Users user){
- Users user2 = null;
- try{
- user2 = getUserById(user.getUserId());
-
- System.out.println("用户的值==="+user2.getUserName());
- }catch(Exception e){
- e.printStackTrace();
- }finally{
-
- }
- if(user2.getUserPass() == user.getUserPass() || user2.getUserPass().equals(user.getUserPass())){
- return true;
- }else{
- return false;
- }
- }
-
-
-
-
-
- public static void main(String[]args){
- Session hibernateSession = HibernateSessionFactory.getSession();
- System.out.println("测试Session是否启动1"+hibernateSession.toString());
- hibernateSession.close();
- System.out.println("测试Session是否启动2"+hibernateSession.toString());
-
- hibernateSession = HibernateSessionFactory.getSession();
- System.out.println("测试Session是否启动1"+hibernateSession.toString());
- HibernateSessionFactory.closeSession();
- System.out.println("测试Session是否启动2"+hibernateSession.toString());
-
- Users user = new Users();
- user.setUserId("001");
- user.setUserPass("employee");
-
- boolean flag = checkUser(user);
- System.out.println("是否是正确的?"+flag);
- }
-
- }
以下是FlowService.java源代码:
Java代码
- package com.flowdemo.service;
-
- import java.util.ArrayList;
- import java.util.List;
-
- import org.jbpm.JbpmConfiguration;
- import org.jbpm.JbpmContext;
- import org.jbpm.db.GraphSession;
- import org.jbpm.graph.def.ProcessDefinition;
- import org.jbpm.graph.exe.ProcessInstance;
- import org.jbpm.taskmgmt.exe.TaskInstance;
-
- import com.flowdemo.jbpm.util.PoTaskWrapper;
- import com.flowdemo.po.Expenses;
- import com.flowdemo.po.Users;
- import com.flowdemo.util.HibernateSessionFactory;
-
- public class FlowService {
-
- static JbpmConfiguration jbpmConfiguration = JbpmConfiguration.getInstance();
-
-
-
-
- public static void initJbpm(){
- JbpmContext jbpmContext = jbpmConfiguration.getCurrentJbpmContext();
- if(jbpmContext == null || jbpmContext.equals("")){
- jbpmContext = jbpmConfiguration.createJbpmContext();
- }
-
- try{
- ProcessDefinition processDefinition = ProcessDefinition.parseXmlResource("com/flowdemo/jbpm/expense/processdefinition.xml");;
-
- System.out.println("流程定义是否加载?==="+processDefinition.toString());
-
jbpmContext.deployProcessDefinition(processDefinition);
-
-
GraphSession graphSession = jbpmContext.getGraphSession();
-
processDefinition = graphSession.findLatestProcessDefinition("expense");
- }finally{
- jbpmContext.close();
- }
-
- }
-
-
-
-
- public static void bindingExpenseToProcess(){
-
JbpmContext jbpmContext = jbpmConfiguration.getCurrentJbpmContext();
- if(jbpmContext == null || jbpmContext.equals("")){
-
jbpmContext = jbpmConfiguration.createJbpmContext();
- }
- try{
-
jbpmContext.setSessionFactory(HibernateSessionFactory.getSessionFactory());
-
ProcessDefinition processDefinition = jbpmContext.getGraphSession().findLatestProcessDefinition("expense");
- ProcessInstance processInstance = new ProcessInstance(processDefinition);
-
- jbpmContext.save(processInstance);
-
- long processInstanceId = processInstance.getId();
-
-
- Expenses expense = (Expenses)jbpmContext.getSession().createQuery("from Expenses where processInstanceId = "+null).list().get(0);
-
- expense.setProcessInstanceId(new Long(processInstanceId).toString());
-
- jbpmContext.getSession().update(expense);
- processInstance.getContextInstance().setVariable("expense_id", expense.getExpenseId());
-
- processInstance.signal();
- }finally{
- jbpmContext.close();
- }
-
- }
-
-
-
-
-
-
- public static List getTasks(Users user){
-
JbpmContext jbpmContext = jbpmConfiguration.getCurrentJbpmContext();
- if(jbpmContext == null || jbpmContext.equals("")){
-
jbpmContext = jbpmConfiguration.createJbpmContext();
- }
- System.out.println("提供任务的人的名字"+user.getUserName());
- List tasks = new ArrayList();
-
- List poAndTasks = new ArrayList();
- try{
-
tasks = jbpmContext.getTaskMgmtSession().findTaskInstances(user.getUserName());
- System.out.println("需要处理的任务的多少"+tasks);
- TaskInstance taskInstance = null;
- Expenses expense = null;
-
- for(int i=0;i<tasks.size();i++){
- taskInstance = (TaskInstance)tasks.get(i);
- Integer expenseId =(Integer)taskInstance.getProcessInstance().getContextInstance().getVariable("expense_id");
- System.out.println("expenseId的值是多少呢?"+expenseId);
-
- PoTaskWrapper poTask = new PoTaskWrapper();
-
- jbpmContext.setSessionFactory(HibernateSessionFactory.getSessionFactory());
- expense = (Expenses)jbpmContext.getSession().load(Expenses.class, expenseId);
- System.out.println("对应的报销单的编号、金额和理由"+expense.getExpenseId()+" "+expense.getMoney()+" "+expense.getReason());
-
-
- poTask.setExpense(expense);
- System.out.println("poTask获得的expense-->"+poTask.getExpense().getMoney());
- poTask.setTaskInstanceId(taskInstance.getId());
- poTask.setTokenId(taskInstance.getToken().getId());
- poAndTasks.add(poTask);
- }
- }catch(Exception e){
- e.printStackTrace();
- }finally{
- jbpmContext.close();
- }
-
- System.out.println("队列的长度 -->"+poAndTasks.size());
- return poAndTasks;
- }
-
-
-
-
-
- public static boolean managerApprove(String processInstanceId){
- JbpmContext jbpmContext = jbpmConfiguration.getCurrentJbpmContext();
- if(jbpmContext == null || jbpmContext.equals("")){
- jbpmContext = jbpmConfiguration.createJbpmContext();
- }
- try{
- ProcessInstance processInstance = jbpmContext.getProcessInstance(new Long(processInstanceId).longValue());
-
-
- TaskInstance taskInstance = processInstance.getTaskMgmtInstance().createTaskInstance();
- taskInstance.end();
- processInstance.signal();
-
- }catch(Exception e){
- e.printStackTrace();
- }finally{
- jbpmContext.close();
- }
-
- return false;
- }
-
-
-
-
-
-
- public static void approve(long taskInstanceId){
- JbpmContext jbpmContext = jbpmConfiguration.getCurrentJbpmContext();
- if(jbpmContext == null || jbpmContext.equals("")){
- jbpmContext = jbpmConfiguration.createJbpmContext();
- }
- try{
- TaskInstance taskInstance = jbpmContext.getTaskInstance(taskInstanceId);
-
- taskInstance.end();
-
-
- }catch(Exception e){
- e.printStackTrace();
- }finally{
- jbpmContext.close();
- }
- }
-
- }
还有一点需要注意的是,在测试运行之前需要把jbpm的数据库表创建好,当然也可以通过JbpmContext
jbpmContext = cfg.createJbpmContext();来创建,但是这是在每次运行时都会创建,所以还是直接通过导入jbpm的sql文件来创建的好。
好了,一个基于struts的jbpm应用差不多就完成了,我比较懒,所以也不太想在介绍代码上费功夫了,各位看官自己看咯,呵呵。
还想做一些集成spring的应用,但是由于公司也没用上这种技术,所以兴趣又降了一大半,⊙﹏⊙b汗。以后有机会再自己写写吧。以下附上源代码。有需要的请下载吧。按照习惯,我去掉了jar包,所有的需要的jar清单,请看图片:
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