将JBPM4整合到web工程
1.在eclipse里面创建一个动态的web项目。
2.在lib目录下加入依赖库（由于我们在jsp中需要用到jstl标签，所以这里我们还必须加入jstl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
用tomcat6页面会报错，
解决方法：
方法一：换成tomcat5.5 一点问题也没有了
方法二：将juel.jar, juel-engine.jar, juel-impl.jar这三个包复制到tomcat6下lib中，并删除原来的el-api.jar，切记要把WEB-INF\lib中的juel.jar, juel-engine.jar, juel-impl.jar删除。不然还是要冲突。
3.在项目的Java Resources目录下创建一个resources目录，并且把“JBPM4初探---HelloWorld”项目中src目录下的所有配置文件拷到resources目录下。
4.在项目的src目录一个java文件（servlet），用来编写我们发布流程并获取最新发布的流程定义
package com.test; import java.io.IOException; import java.util.ArrayList; import java.util.LinkedHashMap; import java.util.List; import java.util.Map; 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.jbpm.api.Configuration; import org.jbpm.api.ProcessDefinition; import org.jbpm.api.ProcessDefinitionQuery; import org.jbpm.api.ProcessEngine; import org.jbpm.api.RepositoryService; public class JbpmServlet extends HttpServlet { private static final long serialVersionUID = 1L; private ProcessEngine processEngine = null; private RepositoryService repositoryService = null; /* 初始化ProcessEngine. */ public void init(ServletConfig config) throws ServletException { processEngine = new Configuration().buildProcessEngine(); repositoryService = processEngine.getRepositoryService(); } 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")) { deployProcessDefinition(request, response); } else { removeProcessDefinitionById(request, response); } List list = getLatestProcessDefinition(request, response); request.setAttribute("process", list); request.getRequestDispatcher("/index.jsp").forward(request, response); } /** * 发布流程方法 * @param request * @param response * @throws ServletException * @throws IOException */ protected void deployProcessDefinition(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String xml = request.getParameter("xml"); repositoryService.createDeployment().addResourceFromString( "hello.jpdl.xml", xml).deploy(); } /* 获取所有最新流程. */ protected List<ProcessDefinition> getLatestProcessDefinition( HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //获取全部的流程定义 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()); } /* 删除流程定义. */ protected void removeProcessDefinitionById(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String id = request.getParameter("id"); //根据流程ID获取流程定义实例 //注意:jbpm4是不允许直接根据流程定义的ID来直接删除流程定义的 ProcessDefinition pd = repositoryService.createProcessDefinitionQuery() .processDefinitionId(id).uniqueResult(); repositoryService.deleteDeploymentCascade(pd.getDeploymentId()); } } }<%@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>jbpm学习</title> </head> <body> <form action="jbpm?zzg=deploy" method="post"> <textarea name="xml" cols=50 rows=15></textarea> <input type="submit" value="发布"/> <input type="reset" value="取消"/> </form> <table width=430 border=1> <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>${process.version}</td> <td><a href="jbpm?zzg=delete&id=${process.id }">删除</a></td> </tr> </c:forEach> </table> </body> </html> <servlet> <description /> <servlet-name>JbpmServlet</servlet-name> <servlet-class>com.test.JbpmServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>JbpmServlet</servlet-name> <url-pattern>/jbpm</url-pattern> </servlet-mapping>
<?xml version="1.0" encoding="UTF-8"?><process name="hello" xmlns="http://jbpm.org/4.3/jpdl"> <start g="235,38,48,48" name="start1"> <transition name="to state1" to="state1" g="-59,-17"/> </start> <state g="214,154,92,52" name="state1"> <transition name="to end1" to="end1" g="-47,-17"/> </state> <end g="240,284,48,48" name="end1"/></process>