activiti工作流項目中顯示流程進度

1.flowList.jsp頁面使用img標籤，processInstanceId爲後臺傳來的值

<img src="testController.do?queryProPlan&ProcessInstanceId=${processInstanceId}"/>

2.後臺代碼（ProcessDiagramGenerator的獲取根據activiti版本的不同有兩種方式）

package com.hdkj.test.controller;


import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import org.jeecgframework.core.common.controller.BaseController;
import org.jeecgframework.web.system.service.SystemService;

import java.io.InputStream;
import org.activiti.bpmn.model.BpmnModel;
import org.activiti.engine.HistoryService;
import org.activiti.engine.ProcessEngineConfiguration;
import org.activiti.engine.RepositoryService;
import org.activiti.engine.RuntimeService;
import org.activiti.engine.TaskService;
import org.activiti.engine.history.HistoricActivityInstance;
import org.activiti.engine.history.HistoricProcessInstance;
import org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl;
import org.activiti.engine.impl.context.Context;
import org.activiti.engine.impl.persistence.entity.ProcessDefinitionEntity;
import org.activiti.engine.impl.pvm.PvmTransition;
import org.activiti.engine.impl.pvm.process.ActivityImpl;
import org.activiti.image.ProcessDiagramGenerator;
import org.activiti.image.impl.DefaultProcessDiagramGenerator;
import org.activiti.spring.ProcessEngineFactoryBean;
import java.io.IOException;

import com.hdkj.test.service.TestServiceI;

/**
 * @Title: Controller
 * @Description: test
 * @author onlineGenerator
 * @date 2019-11-15 14:27:21
 * @version V1.0
 * 
 */
@Controller
@RequestMapping("/testController")
public class CopyOfTestController1 extends BaseController {
	private static final Logger logger = LoggerFactory
			.getLogger(CopyOfTestController1.class);

	@Autowired
	private TestServiceI testService;
	@Autowired
	private SystemService systemService;

	@Autowired
	RepositoryService repositoryService;
	@Autowired
	protected RuntimeService runtimeService;
	@Autowired
	ProcessEngineConfiguration processEngineConfiguration;
	@Autowired
	ProcessEngineFactoryBean processEngine;
	@Autowired
	HistoryService historyService;
	@Autowired
	TaskService taskService;

	/**
	 * test列表 頁面跳轉
	 * 
	 * @return
	 */
	@RequestMapping(params = "list")
	public ModelAndView list(HttpServletRequest request) {
		return new ModelAndView("com/hdkj/test/testList");
	}

	/**
	 * 流程列表 頁面跳轉
	 * 
	 * @return
	 */
	@RequestMapping(params = "flowList")
	public ModelAndView flowList(HttpServletRequest request) {
		String id = request.getParameter("id");
		String processInstanceId = this.testService
				.getProcessInstanceIdById(id);
		request.setAttribute("businesskey", id);
		request.setAttribute("processInstanceId", processInstanceId);
		return new ModelAndView("com/hdkj/test/flowList");
	}

	@RequestMapping(params = "queryProPlan")
	public void queryProPlan(HttpServletRequest request,
			HttpServletResponse response) throws IOException {
		String processInstanceId = request.getParameter("ProcessInstanceId");
		// 獲取歷史流程實例
		HistoricProcessInstance processInstance = historyService
				.createHistoricProcessInstanceQuery()
				.processInstanceId(processInstanceId).singleResult();
		// 獲取流程圖
		BpmnModel bpmnModel = repositoryService.getBpmnModel(processInstance
				.getProcessDefinitionId());
		processEngineConfiguration = processEngine
				.getProcessEngineConfiguration();
		Context.setProcessEngineConfiguration((ProcessEngineConfigurationImpl) processEngineConfiguration);
		//activiti-engine-5.15.jar版本獲取diagramGenerator方式
		ProcessDiagramGenerator diagramGenerator = new DefaultProcessDiagramGenerator();
		//activiti-engine-5.22.0.jar版本獲取diagramGenerator方式
		//ProcessDiagramGenerator diagramGenerator = processEngineConfiguration
		//		.getProcessDiagramGenerator();
		ProcessDefinitionEntity definitionEntity = (ProcessDefinitionEntity) repositoryService
				.getProcessDefinition(processInstance.getProcessDefinitionId());
		/*第一種.高亮目前走過的節點*/
		List<HistoricActivityInstance> highLightedActivitList = historyService
				.createHistoricActivityInstanceQuery()
				.processInstanceId(processInstanceId).orderByHistoricActivityInstanceStartTime().desc().list();
		
		/*第二種,高亮最後走過的那個節點*/
		/*List<HistoricActivityInstance> highLightedActivitList1 = historyService
				.createHistoricActivityInstanceQuery()
				.processInstanceId(processInstanceId).orderByHistoricActivityInstanceStartTime().desc().list();
		List<HistoricActivityInstance> highLightedActivitList=new ArrayList<HistoricActivityInstance>();
		highLightedActivitList.add(highLightedActivitList1.get(0));
		*/
		// 高亮環節id集合
		List<String> highLightedActivitis = new ArrayList<String>();

		// 高亮線路id集合
		List<String> highLightedFlows = getHighLightedFlows(definitionEntity,
				highLightedActivitList);

		for (HistoricActivityInstance tempActivity : highLightedActivitList) {
			String activityId = tempActivity.getActivityId();
			highLightedActivitis.add(activityId);
		}
		// 中文顯示的是口口口，設置字體就好了
		InputStream imageStream = diagramGenerator.generateDiagram(bpmnModel,
				"png", highLightedActivitis, highLightedFlows, "宋體", "宋體",
				null, null, 1.0);
		// 單獨返回流程圖，不高亮顯示
		// InputStream imageStream =
		// diagramGenerator.generatePngDiagram(bpmnModel);
		// 輸出資源內容到相應對象
		byte[] b = new byte[1024];
		int len;
		while ((len = imageStream.read(b, 0, 1024)) != -1) {
			response.getOutputStream().write(b, 0, len);
		}

	}

	/**
	 * 獲取需要高亮的線
	 * 
	 * @param processDefinitionEntity
	 * @param historicActivityInstances
	 * @return
	 */
	private List<String> getHighLightedFlows(
			ProcessDefinitionEntity processDefinitionEntity,
			List<HistoricActivityInstance> historicActivityInstances) {

		List<String> highFlows = new ArrayList<String>();// 用以保存高亮的線flowId
		for (int i = 0; i < historicActivityInstances.size() - 1; i++) {// 對歷史流程節點進行遍歷
			ActivityImpl activityImpl = processDefinitionEntity
					.findActivity(historicActivityInstances.get(i)
							.getActivityId());// 得到節點定義的詳細信息
			List<ActivityImpl> sameStartTimeNodes = new ArrayList<ActivityImpl>();// 用以保存後需開始時間相同的節點
			ActivityImpl sameActivityImpl1 = processDefinitionEntity
					.findActivity(historicActivityInstances.get(i + 1)
							.getActivityId());
			// 將後面第一個節點放在時間相同節點的集合裏
			sameStartTimeNodes.add(sameActivityImpl1);
			for (int j = i + 1; j < historicActivityInstances.size() - 1; j++) {
				HistoricActivityInstance activityImpl1 = historicActivityInstances
						.get(j);// 後續第一個節點
				HistoricActivityInstance activityImpl2 = historicActivityInstances
						.get(j + 1);// 後續第二個節點
				if (activityImpl1.getStartTime().equals(
						activityImpl2.getStartTime())) {
					// 如果第一個節點和第二個節點開始時間相同保存
					ActivityImpl sameActivityImpl2 = processDefinitionEntity
							.findActivity(activityImpl2.getActivityId());
					sameStartTimeNodes.add(sameActivityImpl2);
				} else {
					// 有不相同跳出循環
					break;
				}
			}
			List<PvmTransition> pvmTransitions = activityImpl
					.getOutgoingTransitions();// 取出節點的所有出去的線
			for (PvmTransition pvmTransition : pvmTransitions) {
				// 對所有的線進行遍歷
				ActivityImpl pvmActivityImpl = (ActivityImpl) pvmTransition
						.getDestination();
				// 如果取出的線的目標節點存在時間相同的節點裏，保存該線的id，進行高亮顯示
				if (sameStartTimeNodes.contains(pvmActivityImpl)) {
					highFlows.add(pvmTransition.getId());
				}
			}
		}
		return highFlows;
	}

}