activiti学习资料(实例流程图的显示)

activiti 实例流程图的显示方法

所谓实例流程图的显示，就是显示流程图的同时，高亮显示正在执行的节点。有两种方法

直接生成带老亮节点的图片：

try{
//	            ProcessDefinitionEntity pde = (ProcessDefinitionEntity) RepositoryService
//	            .getDeployedProcessDefinition(procDefId);

InputStream imageStream =
ProcessDiagramGenerator.generateDiagram(
def, "png",
runtimeService.getActiveActivityIds(executionId));
List<Task> list = taskService.createTaskQuery().processInstanceId(executionId).orderByTaskId().desc().list();
int size = list.size();
getRequest().setAttribute("inputStream", imageStream);
}catch(RasterFormatException e){
e.printStackTrace();
}

img.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();
}

%>

方法2： 图片和高亮节点圈分别产生

/**
* 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 executionId = getRequest().getParameter("executionId");
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);
ActivityImpl actImpl = null;

ExecutionEntity execution = (ExecutionEntity) runtimeService
.createExecutionQuery().executionId(executionId).singleResult();// 执行实例

String activitiId = execution.getActivityId();// 当前实例的执行到哪个节点
//	        List<String>activitiIds = runtimeService.getActiveActivityIds(executionId);

List<ActivityImpl> activitiList = def.getActivities();// 获得当前任务的所有节点
//	        for(String activitiId : activitiIds){
for (ActivityImpl activityImpl : activitiList) {
String id = activityImpl.getId();
if (id.equals(activitiId)) {// 获得执行到那个节点
actImpl = activityImpl;
break;
}
}
//	        }

getRequest().setAttribute("coordinateObj", actImpl);
getRequest().setAttribute("procDefId",procDefId );
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"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>
<head>
<title></title>
</head>
<body>
<div >
<img src="getProcessPic.action?procDefId=${procDefId}" style="position:absolute; left:0px; top:0px;">
<!-- 给执行的节点加框 -->
<div style="position:absolute; border:2px solid red;left:${coordinateObj.x-1 }px;top:${coordinateObj.y-1 }px;width:${coordinateObj.width }px;height:${coordinateObj.height }px;"></div>
</div>

</body>
</html>

struts.xml

<action name="getProcessPic" class="processInstanceAction" method="getProcessPic">
<result name = "success" >/incident/pic.jsp</result>
</action>
<action name="getProcessMap" class="processInstanceAction" method="getProcessMap">
<result name = "success" >/incident/showImg.jsp</result>
</action>

需要注意的是，当你的流程图中存在并发节点时需要用到runtimeService.getActiveActivityIds(proInstId)得到多个活动节点。

这个方法可以在activiti的帮助文档中找到，但它的原文中是getActiveActivityIds(String executionId)（执行ID）这是错的，因为在数据库的_ru_task表（运行任务表）中，执行ID与任务记录一一对应，但可以存在多个流程实例Id相同的任务记录。

activiti-explorer源码下载地址：https://github.com/HSSC/activiti-explorer