activiti 并发任务实例流程图的显示

1.写在前面： 
activiti中并发后的活动任务节点通过runtimeService.getActiveActivityIds(String proInstId)得到。 
这个方法在Activiti的doc文档中介绍的不对，它错把参数写成了executionId，而事实上，一个流程实例（对应流程实例编号ProInstId）在运行中通过并发节点产生多个执行任务（对应执行编号executionId）。 
2.关键代码： 
ProcessInstanceAction.java 

public class ProcessInstanceAction extends BaseAction {
  private List actImpls = new ArrayList();

    public List getActImpls() {
        return actImpls;
    }

    public void setActImpls(List actImpls) {
        this.actImpls = actImpls;
    }
    /**
     * 显示流程图
     *
     * @return
     * @throws Exception
     */
    public String getProcessPic() throws Exception {
        // String taskId =
        // "2901";//getRequest().getParameter("taskId");3016,552,3020
        String procDefId = getRequest().getParameter("procDefId");
        ProcessDefinition procDef = repositoryService
                .createProcessDefinitionQuery().processDefinitionId(procDefId)
                .singleResult();
        String diagramResourceName = procDef.getDiagramResourceName();
        InputStream imageStream = repositoryService.getResourceAsStream(procDef
                .getDeploymentId(), diagramResourceName);
        getRequest().setAttribute("inputStream", imageStream);
        return SUCCESS;
    }

    /**
     * 获取跟踪信息
     *
     * @return
     * @throws Exception
     */
    public String getProcessMap() throws Exception {
        String procDefId = getRequest().getParameter("procDefId");
        String proInstId = getRequest().getParameter("procInstId");
        ProcessDefinition processDefinition = repositoryService
                .createProcessDefinitionQuery().processDefinitionId(procDefId)
                .singleResult();

        ProcessDefinitionImpl pdImpl = (ProcessDefinitionImpl) processDefinition;
        String processDefinitionId = pdImpl.getId();// 流程标识

        ProcessDefinitionEntity def = (ProcessDefinitionEntity) ((RepositoryServiceImpl) repositoryService)
                .getDeployedProcessDefinition(processDefinitionId);

        List activitiList = def.getActivities();// 获得当前任务的所有节点

        /**获取活动任务start**/

        List ActiveActivityIds = runtimeService
                .getActiveActivityIds(proInstId);//获取将被执行的活动节点
        for (String activeId : ActiveActivityIds) {

            for (ActivityImpl activityImpl : activitiList) {
                String id = activityImpl.getId();
                if (activityImpl.isScope()) {//判断节点是否为subProcess
                    if (activityImpl.getActivities().size() > 1) {
                        List subAcList = activityImpl
                                .getActivities();
                        for (ActivityImpl subActImpl : subAcList) {
                            String subid = subActImpl.getId();
                            if (activeId.equals(subid)) {// 获得执行到的活动节点
                                actImpls.add(subActImpl);
                                break;
                            }
                        }
                    }

                }
                if (activeId.equals(id)) {// 获得执行到的活动节点

                    actImpls.add(activityImpl);
                }
            }
        }
        /**获取活动任务end**/

        getRequest().setAttribute("procDefId", procDefId);
        /**这个参数通过前台的showImg.jsp传给getProcessPic.action获取流程图**/

        return SUCCESS;
    }
}

pic.jsp 

<%@page import="java.io.InputStream"%>
<%@page import="org.activiti.engine.impl.*"%>
<%@page import="org.activiti.engine.impl.pvm.*"%>
<%@page import="org.activiti.engine.impl.pvm.process.*"%>
<%@page import="org.activiti.engine.repository.*"%>
<%@page import="org.activiti.engine.*"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>

<%

    InputStream is = (InputStream)request.getAttribute("inputStream");

    byte[] b = new byte[1024];
    int len = -1;
    while((len = is.read(b, 0, 1024)) != -1) {
        response.getOutputStream().write(b, 0, len);
        // 防止异常：getOutputStream() has already been called for this response
        out.clear();
        out = pageContext.pushBody();
    }

%>

showImg.jsp 

<%@page import="java.io.InputStream"%>
<%@page import="org.activiti.engine.impl.*"%>
<%@page import="org.activiti.engine.impl.pvm.*"%>
<%@page import="org.activiti.engine.impl.pvm.process.*"%>
<%@page import="org.activiti.engine.repository.*"%>
<%@page import="org.activiti.engine.*"%>
<%@ page language="java" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
>

<html>
<head>
    <title>title>
head>
<body>
    <div >
        <img src="getProcessPic.action?procDefId=${procDefId}" style="position:absolute; left:0px; top:0px;">
    <s:iterator value="actImpls">

        <div style="position:absolute; border:2px solid red;left:${x-1 }px;top:${y-1 }px;width:${width }px;height:${height }px;">div>
        s:iterator>
    div>

body>
html>

另附：环境配置struts+activiti+spring： 
struts.xml 

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

"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
    <constant name="struts.objectFactory.spring.autoWire" value="name" />
    <constant name="struts.objectFactory" value="spring" />
    <package name="default" extends="struts-default">
    <action name="getProcessPic" class="processInstanceAction" method="getProcessPic">
            <result name = "success" >/incident/pic.jspresult>
        action>
        <action name="getProcessMap" class="processInstanceAction" method="getProcessMap">
            <result name = "success" >/incident/showImg.jspresult>
        action>
package>
struts>

applicationContext.xml 

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

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans   http://www.springframework.org/schema/beans/spring-beans.xsd
                           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
                           http://www.springframework.org/schema/tx      http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">

  <context:component-scan base-package="org.activiti.spring.test.jpa"/>

  <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver" />
    <property name="url" value="jdbc:mysql://localhost:3306/acitivitiexample?autoReconnect=true" />
    <property name="username" value="root" />
    <property name="password" value="root" />
    <property name="defaultAutoCommit" value="false" />
  bean>

  <tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="false"/>
  <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="entityManagerFactory" ref="entityManagerFactory"/>
  bean>

  <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource"/>
     <property name="persistenceXmlLocation">
      <value>classpath:/jpa/persistence.xmlvalue>
    property>
    <property name="jpaVendorAdapter">
      <bean class="org.springframework.orm.jpa.vendor.OpenJpaVendorAdapter">
        <property name="databasePlatform" value="org.apache.openjpa.jdbc.sql.MySQLDictionary" />
      bean>
    property>
  bean>

  <bean id="incidentBean" class="jpa.IncidentBean">
  bean>

  <bean id="processEngineConfiguration" class="org.activiti.spring.SpringProcessEngineConfiguration">
    <property name="dataSource" ref="dataSource" />
    <property name="transactionManager" ref="transactionManager" />
    <property name="databaseSchemaUpdate" value="true" />
    <property name="jpaEntityManagerFactory" ref="entityManagerFactory" />
    <property name="jpaHandleTransaction" value="false" />
    <property name="jpaCloseEntityManager" value="false" />
    <property name="jobExecutorActivate" value="true" />
    <property name="mailServerPort" value="25" />
   bean>

  <bean id="processEngine" class="org.activiti.spring.ProcessEngineFactoryBean">
    <property name="processEngineConfiguration" ref="processEngineConfiguration" />
  bean>

  <bean id="repositoryService" factory-bean="processEngine" factory-method="getRepositoryService" />
  <bean id="runtimeService" factory-bean="processEngine" factory-method="getRuntimeService" />
  <bean id="taskService" factory-bean="processEngine" factory-method="getTaskService" />
  <bean id="historyService" factory-bean="processEngine" factory-method="getHistoryService" />
  <bean id="managementService" factory-bean="processEngine" factory-method="getManagementService" />
  <bean id="identityService" factory-bean="processEngine" factory-method="getIdentityService" />
  <bean id="formService" factory-bean="processEngine"
        factory-method="getFormService" />
   <bean id="processInstanceAction" class="action.ProcessInstanceAction"
        scope="prototype">
        <property name="runtimeService" ref="runtimeService">property>
        <property name="taskService" ref="taskService">property>
        <property name="formService" ref="formService">property>
        <property name="identityService" ref="identityService">property>
        <property name="incidentBean" ref="incidentBean">property>
        <property name="repositoryService" ref="repositoryService">property>
  bean>
 beans>

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