JBPM4---簡易的請假實例

1.新建一個動態的web項目 

2.在lib目錄下加入以下jar包（由於用到fileupload的上傳，所以還要加入fileupload的依賴庫） 

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.繪製流程圖（在resources目錄下建立一個leave.jpdl.xml文件） 
 

<?xml version="1.0" encoding="UTF-8"?>

<process name="leave" xmlns="http://jbpm.org/4.0/jpdl">
   <start g="201,14,48,48" name="開始">
      <transition g="-42,-10" name="請假" to="填寫請假單"/>
   </start>
   <task assignee="Kayzhan" g="178,87,92,52" name="填寫請假單">
      <transition g="-97,2" name="判斷是不是經理" to="是不是經理"/>
   </task>
   <decision expr="#{manager}" g="204,158,48,48" name="是不是經理">
      <transition g="-23,-11" name="否" to="經理審覈"/>
      <transition g="14,-11" name="是" to="老闆審批"/>
   </decision>
   <task assignee="Lingo" g="103,252,92,52" name="經理審覈">
      <transition g="150,450:10,-21" name="經理批准" to="結束"/>
      <transition g="-22,-22" name="請假天數>3" to="老闆審批"/>
      <transition g="-61,-1" name="經理不批准" to="終止"/>
      <transition g="149,114:-55,82" name="經理駁回" to="填寫請假單"/>
   </task>
   <task assignee="ForgetDavi" g="278,251,92,52" name="老闆審批">
      <transition g="326,450:-58,-24" name="老闆批准" to="結束"/>
      <transition g="7,0" name="老闆不批准" to="終止"/>
      <transition g="323,114:13,61" name="老闆駁回" to="填寫請假單"/>
   </task>
   <end g="219,429,48,48" name="結束" state="confirm"/>
   <end g="220,360,48,48" name="終止" state="dissent"/>
</process>

4.編寫流程發佈及控制的類 

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);
        // 獲取流程引擎
        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 {
        // 根據流程定義的KEY值啓動一個新的流程實例
        processInstance = executionService.startProcessInstanceByKey("leave");
        //判斷流程定義的活動是否是“填寫請假單”的活動
        if (processInstance.isActive("填寫請假單")) {
            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("經理")) {
            //"manager"變量名與leave.jpdl.xml中decision裏面的變量一致，同時設置的值也要保持一致
            variables.put("manager", "是");
        } else {
            variables.put("manager", "否");
        }
        //獲取任務列表，因爲我們在填寫請假單的時候是分配給“zzg”的，見leave.jpdl.xml
        taskList = taskService.findPersonalTasks("zzg");
        //根據任務列表獲取任務
        task = taskList.get(0);
        //把設置好的變量放到任務服務裏面並根據任務ID結束任務
        taskService.setVariables(task.getId(), variables);
        taskService.completeTask(task.getId());
        //判斷任務活動是否到達老闆審批活動
//      execution = executionService.findExecutionById(task.getExecutionId());
//      System.out.println("isActive:  "
//              + execution.getProcessInstance().isActive("老闆審批"));
        return variables;
    }

    /**
     * 獲取任務列表
     *
     * @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;
    }

    /**
     * 查看任務
     *
     * @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("老闆審批")) {
            taskService.completeTask(taskId, "老闆批准");
        } else if (execution.getProcessInstance().isActive("經理審覈")) {
            String variable = (String) taskService.getVariable(taskId,
                    "leaveDay");
            if (Integer.valueOf(variable) > 3) {
                taskService.completeTask(taskId, "請假天數>3");
            } else {
                taskService.completeTask(taskId, "經理批准");
            }
        }
    }

    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("老闆審批")) {
            taskService.completeTask(taskId, "老闆不批准");
        } else if (execution.getProcessInstance().isActive("經理審覈")) {
            taskService.completeTask(taskId, "經理不批准");
        }
    }

    /**
     * 獲取最新版本的流程定義
     * @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());
    }

    /**
     * 根據流程定義ID獲取流程實例
     * @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目錄下創建一個index.jsp頁面，用來發布流程、顯示流程定義及流程實例 

<%@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流程發佈</title>
    </head>
    <body>
        <form action="leave?zzg=deploy" method="POST" enctype="multipart/form-data">
            <input type="file" name="upload">
            <input type="submit" value="發佈">
        </form>
        <ul>
            <li><a href="leave?zzg=leave">請假</a></li>
            <li><a href="leave?zzg=getTask&name=Lingo" target="_blank">經理的任務列表</a></li>
            <li><a href="leave?zzg=getTask&name=ForgetDavi" target="_blank">老闆的任務列表</a></li>
        </ul>
        <table width=480 border=1>
            <tr><td colspan="5">流程定義</td></tr>
            <tr>
                <td>ID</td>
                <td>Key</td>
                <td>名稱</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">流程實例</td></tr>
            <tr>
                <td>ID</td>
                <td>Key</td>
                <td>狀態</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目錄創建一個apply.jsp頁面，用來填寫請假單 

<%@page contentType="text/html;charset=UTF-8" %>

<html>
    <head>
        <title>填寫申請單</title>
    </head>
    <body>
        <form action="leave?zzg=apply" method="POST">
          <table width="300" border=1>
            <tr>
              <td><label>申請人</label></td>
              <td><input type="text" value="zzg" name="applyName"></td>
            </tr>
            <tr>
              <td><label>職位</label></td>
              <td><input type="text" value="經理" name="position"></td>
            </tr>
            <tr>
              <td><label>申請時間</label></td>
              <td><input type="text" value="2009-03-09" name="applyTime"></td>
            </tr>
            <tr>
              <td><label>請假天數</label></td>
              <td><input type="text" value="3" name="leaveDay"></td>
            </tr>
            <tr>
              <td><label>請假原因</label></td>
              <td><textarea name="content" rows=3 cols=200>病假</textarea></td>
            </tr>
            <tr>
              <td><input type="submit" value="申請"></td>
              <td><input type="reset" value="取消"></td>
            </tr>
          </table>
        </form>
    </body>
</html>

7.在webapp目錄下創建一個check.jsp文件，用來顯示任務列表並添加三個操作 

<%@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>請假審批</title>
    </head>
    <body>
        <table width=600 border=1>
            <tr><td colspan="8">任務列表</td></tr>
            <tr>
                <td>ID</td>
                <td>名稱</td>
                <td>分配人</td>
                <td>創建時間</td>
                <td>持續時間</td>
                <td>優先級</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=${task.id }" target="_blank">審覈</a>
                    <a href="leave?zzg=confirm&id=${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目錄下創建一個view.jsp文件，用來顯示請假內容 

<%@page contentType="text/html;charset=UTF-8" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

<html>
    <head>
        <title>審覈</title>
    </head>
    <body>
          <table width="300" border=1>
            <tr>
              <td><label>申請人</label></td>
              <td>${map.name }</td>
            </tr>
            <tr>
              <td><label>職位</label></td>
              <td>${map.position }</td>
            </tr>
            <tr>
              <td><label>申請時間</label></td>
              <td>${map.time }</td>
            </tr>
            <tr>
              <td><label>請假天數</label></td>
              <td>${map.leaveDay }</td>
            </tr>
            <tr>
              <td><label>請假內容</label></td>
              <td>${map.content }</td>
            </tr>
          </table>
    </body>
</html>

8.修改web.xml 

<?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>

9.把leave.jpdl.xml文件壓縮成zip文件發佈即可。