JBPM4---简易的请假实例

最新推荐文章于 2022-05-12 10:47:27 发布

diligentcoder

最新推荐文章于 2022-05-12 10:47:27 发布

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1.新建一个动态的web项目

2.在lib目录下加入以下jar包（由于用到fileupload的上传，所以还要加入fileupload的依赖库）

引用

*JBPM4_HOME/jbpm.jar
*JBPM4_HOME/lib/*.jar
*jakarta-taglibs-standard-1.1.2_HOME/lib/jstl.jar
*jakarta-taglibs-standard-1.1.2_HOME/lib/standard.jar
*commons-fileupload-1.2.1_HOME/lib/commons-fileupload-1.2.1.jar

3.绘制流程图（在resources目录下建立一个leave.jpdl.xml文件）

    Java代码   
    
  
 <?xml version="1.0" encoding="UTF-8"?>  
   
 <process name="leave" xmlns="http://jbpm.org/4.0/jpdl">  
    <start g="201,14,48,48" name="开始">  
       <transition g="-42,-10" name="请假" to="填写请假单"/>  
    </start>  
    <task assignee="Kayzhan" g="178,87,92,52" name="填写请假单">  
       <transition g="-97,2" name="判断是不是经理" to="是不是经理"/>  
    </task>  
    <decision expr="#{manager}" g="204,158,48,48" name="是不是经理">  
       <transition g="-23,-11" name="否" to="经理审核"/>  
       <transition g="14,-11" name="是" to="老板审批"/>  
    </decision>  
    <task assignee="Lingo" g="103,252,92,52" name="经理审核">  
       <transition g="150,450:10,-21" name="经理批准" to="结束"/>  
       <transition g="-22,-22" name="请假天数>3" to="老板审批"/>  
       <transition g="-61,-1" name="经理不批准" to="终止"/>  
       <transition g="149,114:-55,82" name="经理驳回" to="填写请假单"/>  
    </task>  
    <task assignee="ForgetDavi" g="278,251,92,52" name="老板审批">  
       <transition g="326,450:-58,-24" name="老板批准" to="结束"/>  
       <transition g="7,0" name="老板不批准" to="终止"/>  
       <transition g="323,114:13,61" name="老板驳回" to="填写请假单"/>  
    </task>  
    <end g="219,429,48,48" name="结束" state="confirm"/>  
    <end g="220,360,48,48" name="终止" state="dissent"/>  
 </process>  

4.编写流程发布及控制的类

    Java代码   
    
  
 package zzg;  
   
 import java.io.IOException;  
 import java.lang.reflect.Method;  
 import java.util.ArrayList;  
 import java.util.HashMap;  
 import java.util.Iterator;  
 import java.util.LinkedHashMap;  
 import java.util.List;  
 import java.util.Map;  
 import java.util.Set;  
 import java.util.zip.ZipInputStream;  
   
 import javax.servlet.ServletConfig;  
 import javax.servlet.ServletException;  
 import javax.servlet.http.HttpServlet;  
 import javax.servlet.http.HttpServletRequest;  
 import javax.servlet.http.HttpServletResponse;  
   
 import org.apache.commons.fileupload.DiskFileUpload;  
 import org.apache.commons.fileupload.FileItem;  
 import org.jbpm.api.Configuration;  
 import org.jbpm.api.Execution;  
 import org.jbpm.api.ExecutionService;  
 import org.jbpm.api.ProcessDefinition;  
 import org.jbpm.api.ProcessDefinitionQuery;  
 import org.jbpm.api.ProcessEngine;  
 import org.jbpm.api.ProcessInstance;  
 import org.jbpm.api.RepositoryService;  
 import org.jbpm.api.TaskService;  
 import org.jbpm.api.task.Task;  
   
 /** 
  * Servlet implementation class LeaveServlet 
  */  
 public class LeaveServlet extends HttpServlet {  
     private static final long serialVersionUID = 1L;  
     private ProcessEngine processEngine = null;  
     private RepositoryService repositoryService = null;  
     private ExecutionService executionService = null;  
     private ProcessInstance processInstance = null;  
     private TaskService taskService = null;  
     private Task task = null;  
     private Execution execution = null;  
     private String url = null;  
     private List list = null;  
     private List<Task> taskList = null;  
   
     /* 初始化ProcessEngine. */  
     public void init(ServletConfig config) throws ServletException {  
         super.init(config);  
         // 获取流程引擎  
         processEngine = new Configuration().buildProcessEngine();  
         repositoryService = processEngine.getRepositoryService();  
         executionService = processEngine.getExecutionService();  
         taskService = processEngine.getTaskService();  
     }  
   
     protected void doGet(HttpServletRequest request,  
             HttpServletResponse response) throws ServletException, IOException {  
         process(request, response);  
     }  
   
     protected void doPost(HttpServletRequest request,  
             HttpServletResponse response) throws ServletException, IOException {  
         process(request, response);  
     }  
   
     protected void process(HttpServletRequest request,  
             HttpServletResponse response) throws ServletException, IOException {  
         String zzg = request.getParameter("zzg");  
   
         if (zzg.equals("deploy")) {  
             try {  
                 deploy(request, response);  
             } catch (Exception e) {  
                 e.printStackTrace();  
             }  
             list = getLatestProcessDefinition(request, response);  
             request.setAttribute("process", list);  
             request.getRequestDispatcher("/index.jsp").forward(request,  
                     response);  
         } else if (zzg.equals("leave")) {  
             url = leave(request, response);  
             request.getRequestDispatcher(url).forward(request, response);  
         } else if (zzg.equals("query")) {  
             list = getProcessInstanceById(request, response);  
             request.setAttribute("pi", list);  
             request.getRequestDispatcher("/index.jsp").forward(request,  
                     response);  
         } else if (zzg.equals("apply")) {  
             apply(request, response);  
             list = getProcessInstanceById(request, response);  
             request.setAttribute("pi", list);  
             request.getRequestDispatcher("/index.jsp").forward(request,  
                     response);  
         } else if (zzg.equals("getTask")) {  
             list = getTask(request, response);  
             request.setAttribute("taskList", list);  
             request.getRequestDispatcher("/check.jsp").forward(request,  
                     response);  
         } else if (zzg.equals("view")) {  
             Map<String, Object> map = view(request, response);  
             request.setAttribute("map", map);  
             request.getRequestDispatcher("/view.jsp")  
                     .forward(request, response);  
         } else if (zzg.equals("confirm")) {  
             confirm(request, response);  
             list = getTask(request, response);  
             request.setAttribute("taskList", list);  
             request.getRequestDispatcher("/check.jsp").forward(request,  
                     response);  
         } else if (zzg.equals("dissent")) {  
             dissent(request, response);  
             list = getTask(request, response);  
             request.setAttribute("taskList", list);  
             request.getRequestDispatcher("/check.jsp").forward(request,  
                     response);  
         }  
   
         /* 
          * try { Class clz = this.getClass(); Method method = 
          * clz.getDeclaredMethod(action, HttpServletRequest.class, 
          * HttpServletResponse.class); method.invoke(this, request, response); } 
          * catch (Exception ex) { ex.printStackTrace(); } 
          */  
     }  
   
     protected void deploy(HttpServletRequest request,  
             HttpServletResponse response) throws Exception, IOException {  
         String temp = getServletContext().getRealPath("/temp");  
         String upload = getServletContext().getRealPath("/upload");  
         DiskFileUpload diskFileUpload = new DiskFileUpload();  
         diskFileUpload.setFileSizeMax(1 * 1024 * 1024);  
         diskFileUpload.setSizeThreshold(4096);  
         diskFileUpload.setRepositoryPath(temp);  
         List fileItems = diskFileUpload.parseRequest(request);  
         Iterator iter = fileItems.iterator();  
         if (iter.hasNext()) {  
             FileItem item = (FileItem) iter.next();  
             if (!item.isFormField()) {  
                 String name = item.getName();  
                 long size = item.getSize();  
                 System.out.println("name: " + name + "&size:" + size);  
                 if (name != null && !name.equals("") && size > 0) {  
                     // Deploying a process部署流程  
                     repositoryService.createDeployment()  
                             .addResourcesFromZipInputStream(  
                                     new ZipInputStream(item.getInputStream()))  
                             .deploy();  
                 }  
             }  
         }  
     }  
   
     protected String leave(HttpServletRequest request,  
             HttpServletResponse response) throws ServletException, IOException {  
         // 根据流程定义的KEY值启动一个新的流程实例  
         processInstance = executionService.startProcessInstanceByKey("leave");  
         //判断流程定义的活动是否是“填写请假单”的活动  
         if (processInstance.isActive("填写请假单")) {  
             url = "/apply.jsp";  
         }  
         return url;  
     }  
   
     protected Map<String, Object> apply(HttpServletRequest request,  
             HttpServletResponse response) throws ServletException, IOException {  
   
         Map<String, Object> variables = new HashMap<String, Object>();  
         String name = request.getParameter("applyName");  
         String time = request.getParameter("applyTime");  
         String leaveDay = request.getParameter("leaveDay");  
         String content = request.getParameter("content");  
         String position = request.getParameter("position");  
   
         variables.put("name", name);  
         variables.put("time", time);  
         variables.put("leaveDay", leaveDay);  
         variables.put("content", content);  
         variables.put("position", position);  
         if (position.trim().equals("经理")) {  
             //"manager"变量名与leave.jpdl.xml中decision里面的变量一致，同时设置的值也要保持一致  
             variables.put("manager", "是");  
         } else {  
             variables.put("manager", "否");  
         }  
         //获取任务列表，因为我们在填写请假单的时候是分配给“zzg”的，见leave.jpdl.xml  
         taskList = taskService.findPersonalTasks("zzg");  
         //根据任务列表获取任务  
         task = taskList.get(0);  
         //把设置好的变量放到任务服务里面并根据任务ID结束任务  
         taskService.setVariables(task.getId(), variables);  
         taskService.completeTask(task.getId());  
         //判断任务活动是否到达老板审批活动  
 //      execution = executionService.findExecutionById(task.getExecutionId());  
 //      System.out.println("isActive:  "  
 //              + execution.getProcessInstance().isActive("老板审批"));  
         return variables;  
     }  
   
     /** 
      * 获取任务列表 
      *  
      * @param request 
      * @param response 
      * @return 
      * @throws ServletException 
      * @throws IOException 
      */  
     protected List<Task> getTask(HttpServletRequest request,  
             HttpServletResponse response) throws ServletException, IOException {  
         String name = request.getParameter("name");  
         taskList = taskService.findPersonalTasks(name);  
         return taskList;  
     }  
   
     /** 
      * 查看任务 
      *  
      * @param request 
      * @param response 
      * @return 
      * @throws ServletException 
      * @throws IOException 
      */  
     protected Map<String, Object> view(HttpServletRequest request,  
             HttpServletResponse response) throws ServletException, IOException {  
         String taskId = request.getParameter("id");  
         Set<String> set = taskService.getVariableNames(taskId);  
         Map<String, Object> map = taskService.getVariables(taskId, set);  
   
         return map;  
     }  
   
     protected void confirm(HttpServletRequest request,  
             HttpServletResponse response) throws ServletException, IOException {  
         String taskId = request.getParameter("id");  
         task = taskService.getTask(taskId);  
         execution = executionService.findExecutionById(task.getExecutionId());  
         if (execution.getProcessInstance().isActive("老板审批")) {  
             taskService.completeTask(taskId, "老板批准");  
         } else if (execution.getProcessInstance().isActive("经理审核")) {  
             String variable = (String) taskService.getVariable(taskId,  
                     "leaveDay");  
             if (Integer.valueOf(variable) > 3) {  
                 taskService.completeTask(taskId, "请假天数>3");  
             } else {  
                 taskService.completeTask(taskId, "经理批准");  
             }  
         }  
     }  
   
     protected void dissent(HttpServletRequest request,  
             HttpServletResponse response) throws ServletException, IOException {  
         String taskId = request.getParameter("id");  
         task = taskService.getTask(taskId);  
         execution = executionService.findExecutionById(task.getExecutionId());  
         if (execution.getProcessInstance().isActive("老板审批")) {  
             taskService.completeTask(taskId, "老板不批准");  
         } else if (execution.getProcessInstance().isActive("经理审核")) {  
             taskService.completeTask(taskId, "经理不批准");  
         }  
     }  
   
     /** 
      * 获取最新版本的流程定义 
      * @param request 
      * @param response 
      * @return 
      * @throws ServletException 
      * @throws IOException 
      */  
     protected List<ProcessDefinition> getLatestProcessDefinition(  
             HttpServletRequest request, HttpServletResponse response)  
             throws ServletException, IOException {  
         List<ProcessDefinition> processDefinitions = repositoryService  
                 .createProcessDefinitionQuery().orderAsc(  
                         ProcessDefinitionQuery.PROPERTY_NAME).list();  
         Map<String, ProcessDefinition> map = new LinkedHashMap<String, ProcessDefinition>();  
         for (ProcessDefinition pd : processDefinitions) {  
             String key = pd.getKey();  
             ProcessDefinition definition = map.get(key);  
             if ((definition == null)  
                     || (definition.getVersion() < pd.getVersion())) {  
                 map.put(key, pd);  
             }  
         }  
         return new ArrayList(map.values());  
     }  
   
     /** 
      * 根据流程定义ID获取流程实例 
      * @param request 
      * @param response 
      * @return 
      * @throws ServletException 
      * @throws IOException 
      */  
     protected List<ProcessInstance> getProcessInstanceById(  
             HttpServletRequest request, HttpServletResponse response)  
             throws ServletException, IOException {  
         String pdId = request.getParameter("id");  
         return executionService.createProcessInstanceQuery()  
                 .processDefinitionId(pdId).list();  
     }  
   
 }  

5.在webapp目录下创建一个index.jsp页面，用来发布流程、显示流程定义及流程实例

    Java代码   
    
  
 <%@page contentType="text/html;charset=UTF-8" %>  
 <%@page import="org.jbpm.api.*" %>  
 <%@page import="java.util.*" %>  
 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>  
   
 <html>  
     <head>  
         <title>jBPM4流程发布</title>  
     </head>  
     <body>  
         <form action="leave?zzg=deploy" method="POST" enctype="multipart/form-data">  
             <input type="file" name="upload">  
             <input type="submit" value="发布">  
         </form>  
         <ul>  
             <li><a href="leave?zzg=leave">请假</a></li>  
             <li><a href="leave?zzg=getTask&name=Lingo" target="_blank">经理的任务列表</a></li>  
             <li><a href="leave?zzg=getTask&name=ForgetDavi" target="_blank">老板的任务列表</a></li>  
         </ul>  
         <table width=480 border=1>  
             <tr><td colspan="5">流程定义</td></tr>  
             <tr>  
                 <td>ID</td>  
                 <td>Key</td>  
                 <td>名称</td>  
                 <td>版本</td>  
                 <td>操作</td>  
             </tr>  
             <c:forEach var="process" items="${process}">  
             <tr>  
                 <td>${process.id}</td>  
                 <td>${process.key}</td>  
                 <td>${process.name}</td>  
                 <td>${process.version}</td>  
                 <td><a href="leave?zzg=query&id=${process.id }">查看</a></td>  
             </tr>  
             </c:forEach>  
         </table>  
         <br>  
         <br>  
         <br>  
         <table width=480 border=1>  
             <tr><td colspan="5">流程实例</td></tr>  
             <tr>  
                 <td>ID</td>  
                 <td>Key</td>  
                 <td>状态</td>  
             </tr>  
             <c:forEach var="pi" items="${pi}">  
             <tr>  
                 <td>${pi.id}</td>  
                 <td>${pi.key}</td>  
                 <td>${pi.state}</td>  
             </tr>  
             </c:forEach>  
         </table>  
     </body>  
 </html>  

6.在webapp目录创建一个apply.jsp页面，用来填写请假单

    Java代码   
    
  
 <%@page contentType="text/html;charset=UTF-8" %>  
   
 <html>  
     <head>  
         <title>填写申请单</title>  
     </head>  
     <body>  
         <form action="leave?zzg=apply" method="POST">  
           <table width="300" border=1>  
             <tr>  
               <td><label>申请人</label></td>  
               <td><input type="text" value="zzg" name="applyName"></td>  
             </tr>  
             <tr>  
               <td><label>职位</label></td>  
               <td><input type="text" value="经理" name="position"></td>  
             </tr>  
             <tr>  
               <td><label>申请时间</label></td>  
               <td><input type="text" value="2009-03-09" name="applyTime"></td>  
             </tr>  
             <tr>  
               <td><label>请假天数</label></td>  
               <td><input type="text" value="3" name="leaveDay"></td>  
             </tr>  
             <tr>  
               <td><label>请假原因</label></td>  
               <td><textarea name="content" rows=3 cols=200>病假</textarea></td>  
             </tr>  
             <tr>  
               <td><input type="submit" value="申请"></td>  
               <td><input type="reset" value="取消"></td>  
             </tr>  
           </table>  
         </form>  
     </body>  
 </html>  

7.在webapp目录下创建一个check.jsp文件，用来显示任务列表并添加三个操作

    Java代码   
    
  
 <%@page contentType="text/html;charset=UTF-8" %>  
 <%@page import="org.jbpm.api.*" %>  
 <%@page import="java.util.*" %>  
 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>  
   
 <html>  
     <head>  
         <title>请假审批</title>  
     </head>  
     <body>  
         <table width=600 border=1>  
             <tr><td colspan="8">任务列表</td></tr>  
             <tr>  
                 <td>ID</td>  
                 <td>名称</td>  
                 <td>分配人</td>  
                 <td>创建时间</td>  
                 <td>持续时间</td>  
                 <td>优先级</td>  
                 <td>描述</td>  
                 <td>操作</td>  
             </tr>  
             <c:forEach var="task" items="${taskList}">  
             <tr>  
                 <td>${task.id}</td>  
                 <td>${task.name}</td>  
                 <td>${task.assignee}</td>  
                 <td>${task.createTime}</td>  
                 <td>${task.duedate}</td>  
                 <td>${task.priority}</td>  
                 <td>${task.description}</td>  
                 <td>  
                     <a href="leave?zzg=view&id=${task.id }" target="_blank">审核</a>  
                     <a href="leave?zzg=confirm&id=${task.id }&name=${task.assignee}">批准</a>  
                     <a href="leave?zzg=dissent&id=${task.id }&name=${task.assignee}">不批准</a>  
                 </td>  
             </tr>  
             </c:forEach>  
         </table>  
     </body>  
 </html>  

8.在webapp目录下创建一个view.jsp文件，用来显示请假内容

    Java代码   
    
  
 <%@page contentType="text/html;charset=UTF-8" %>  
 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>  
   
 <html>  
     <head>  
         <title>审核</title>  
     </head>  
     <body>  
           <table width="300" border=1>  
             <tr>  
               <td><label>申请人</label></td>  
               <td>${map.name }</td>  
             </tr>  
             <tr>  
               <td><label>职位</label></td>  
               <td>${map.position }</td>  
             </tr>  
             <tr>  
               <td><label>申请时间</label></td>  
               <td>${map.time }</td>  
             </tr>  
             <tr>  
               <td><label>请假天数</label></td>  
               <td>${map.leaveDay }</td>  
             </tr>  
             <tr>  
               <td><label>请假内容</label></td>  
               <td>${map.content }</td>  
             </tr>  
           </table>  
     </body>  
 </html>  

8.修改web.xml

    Java代码   
    
  
 <?xml version="1.0" encoding="UTF-8"?>  
 <web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">  
     <display-name>LeaveJbpm</display-name>  
     <servlet>  
         <description>  
         </description>  
         <display-name>LeaveServlet</display-name>  
         <servlet-name>LeaveServlet</servlet-name>  
         <servlet-class>  
         zzg.LeaveServlet</servlet-class>  
     </servlet>  
     <servlet-mapping>  
         <servlet-name>LeaveServlet</servlet-name>  
         <url-pattern>/leave</url-pattern>  
     </servlet-mapping>  
     <welcome-file-list>  
         <welcome-file>index.jsp</welcome-file>  
     </welcome-file-list>  
 </web-app>  