activiti文本解析

本文主要是介绍activiti文本解析，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

1.所需jar包

	<dependency><groupId>org.activiti</groupId><artifactId>activiti-engine</artifactId><version>5.22.0</version></dependency><dependency><groupId>org.activiti</groupId><artifactId>activiti-bpmn-converter</artifactId><version>5.22.0</version></dependency><dependency><groupId>org.activiti</groupId><artifactId>activiti-bpmn-model</artifactId><version>5.22.0</version></dependency>

2.解析类

package cn.com.agree.rule.engine.activiti;
import org.activiti.bpmn.converter.BpmnXMLConverter;
import org.activiti.bpmn.model.BpmnModel;
import org.activiti.bpmn.model.CallActivity;
import org.activiti.bpmn.model.ExclusiveGateway;
import org.activiti.bpmn.model.FlowElement;
import org.activiti.bpmn.model.FlowNode;
import org.activiti.bpmn.model.InclusiveGateway;
import org.activiti.bpmn.model.ParallelGateway;
import org.activiti.bpmn.model.Process;
import org.activiti.bpmn.model.SequenceFlow;
import org.activiti.bpmn.model.StartEvent;
import org.activiti.engine.impl.util.io.InputStreamSource;
import org.mvel2.MVEL;import java.io.FileInputStream;
import java.io.InputStream;
import java.util.*;public class BPMNService {private Map<String, BpmnModel> bpmnModelMap = new HashMap<>();private Map<String, Process> processMap = new HashMap<>();// 初始化方法，在服务启动时调用public void init(List<String> bpmnFilePaths) throws Exception {for (String filePath : bpmnFilePaths) {loadBpmnModel(filePath);}}// 加载单个 BPMN 文件private void loadBpmnModel(String bpmnFilePath) throws Exception {InputStream bpmnStream = new FileInputStream(bpmnFilePath);BpmnXMLConverter bpmnXMLConverter = new BpmnXMLConverter();InputStreamSource inputStreamSource = new InputStreamSource(bpmnStream);BpmnModel bpmnModel = bpmnXMLConverter.convertToBpmnModel(inputStreamSource, false, false);bpmnStream.close();for (Process process : bpmnModel.getProcesses()) {String definitionKey = process.getId();bpmnModelMap.put(definitionKey, bpmnModel);processMap.put(definitionKey, process);}}// 根据 definitionKey 获取 Processpublic Process getProcessByDefinitionKey(String definitionKey) {return processMap.get(definitionKey);}// 根据当前节点的 ID 获取下一个节点（包括处理网关和嵌套流程）public FlowElement getNextFlowElement(String definitionKey, String currentElementId, Map<String, Object> variables) {Process process = getProcessByDefinitionKey(definitionKey);if (process == null) {return null;}FlowElement currentElement = process.getFlowElement(currentElementId);if (currentElement == null) {return null;}if (currentElement instanceof FlowNode) {List<SequenceFlow> outgoingFlows = ((FlowNode) currentElement).getOutgoingFlows();if (outgoingFlows.isEmpty()) {return null;}if (currentElement instanceof ExclusiveGateway) {// 处理排他网关for (SequenceFlow outgoingFlow : outgoingFlows) {if (evaluateCondition(outgoingFlow.getConditionExpression(), variables)) {return process.getFlowElement(outgoingFlow.getTargetRef());}}} else if (currentElement instanceof ParallelGateway || currentElement instanceof InclusiveGateway) {// 处理并行网关或包容网关，假设返回第一个符合条件的目标节点for (SequenceFlow outgoingFlow : outgoingFlows) {return process.getFlowElement(outgoingFlow.getTargetRef());}} else if (currentElement instanceof CallActivity) {// 处理 callActivityString calledElement = ((CallActivity) currentElement).getCalledElement();Process calledProcess = getProcessByDefinitionKey(calledElement);if (calledProcess != null) {// 假设子流程的开始事件是唯一的for (FlowElement element : calledProcess.getFlowElements()) {if (element instanceof StartEvent) {return element;}}}} else {// 默认处理，返回第一个目标节点return process.getFlowElement(outgoingFlows.get(0).getTargetRef());}}return null;}private boolean evaluateCondition(String conditionExpression, Map<String, Object> variables) {if (conditionExpression == null || conditionExpression.trim().isEmpty()) {return true; // 无条件表达式时默认返回 true}return MVEL.evalToBoolean(conditionExpression, variables);}// 示例主方法public static void main(String[] args) {try {BPMNService bpmnService = new BPMNService();bpmnService.init(Arrays.asList("bpmn\\index.flow.bpmn"));String definitionKey = "trade/test";String startNodeId = "task2";Map<String, Object> variables = new HashMap<>();  // 用于评估条件的变量variables.put("someVariable", true); // 示例变量FlowElement nextElement = bpmnService.getNextFlowElement(definitionKey, startNodeId, variables);if (nextElement != null) {System.out.println("Next Element ID: " + nextElement.getId());System.out.println("Next Element Name: " + nextElement.getName());} else {System.out.println("No next element found for the given node ID.");}} catch (Exception e) {e.printStackTrace();}}
}