feat:解析xml文件内容，追加新节点

ruoyi-common/src/main/java/com/ruoyi/common/utils/bpm/XmlDataParserUtils.java

@@ -1,13 +1,23 @@
 package com.ruoyi.common.utils.bpm;
 
 import cn.hutool.core.util.XmlUtil;
-import org.w3c.dom.Document;
-import org.w3c.dom.Element;
-import org.w3c.dom.NodeList;
+import com.ruoyi.common.utils.uuid.IdUtils;
+import org.w3c.dom.*;
 
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerConfigurationException;
+import javax.xml.transform.TransformerException;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.dom.DOMSource;
+import javax.xml.transform.stream.StreamResult;
+import java.io.StringWriter;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.UUID;
 
+/**
+ * 解析处理xml文件内容工具类
+ */
 public class XmlDataParserUtils {
 
     /**
@@ -37,4 +47,89 @@ public class XmlDataParserUtils {
         }
         return map;
     }
+
+    /**
+     * 新增用户任务节点
+     * @param userTaskTagName 新增节点名称
+     * @param nextTagId 新增节点下一节点ID
+     * @return
+     */
+    public static String addUserTaskTag(String xmlData,String userTaskTagName,String nextTagId) throws Exception {
+        //新增节点标签ID
+        String newUserTaskTagId = "Flow_" + IdUtils.fastSimpleUUID().substring(0,7);
+        //新增序列流ID
+        String newSequenceFlowId = "Flow_" + IdUtils.fastSimpleUUID().substring(0,7);
+        //新增节点下一节点序列流ID
+        String sequenceFlowId = null;
+        //上一节点标签ID
+        String previousId = null;
+        Document document= XmlUtil.parseXml(xmlData);
+        //获得XML文档根节点
+        Element elementG=XmlUtil.getRootElement(document);
+        //获取所有序列流（顺序）,循环得到新增节点下一节点序列流ID、上一节点标签ID,修改新增节点下一节点序列流sourceRef为新增节点标签ID
+        NodeList elementsByTagName = elementG.getElementsByTagName("bpmn:sequenceFlow");
+        for (int i = 0; i < elementsByTagName.getLength(); i++) {
+            if (nextTagId.equals(elementsByTagName.item(i).getAttributes().getNamedItem("targetRef").getNodeValue())) {
+                sequenceFlowId = elementsByTagName.item(i).getAttributes().getNamedItem("id").getNodeValue();
+                previousId = elementsByTagName.item(i).getAttributes().getNamedItem("sourceRef").getNodeValue();
+                //获取当前元素
+                Node node = elementsByTagName.item(i);
+                //创建一个新的Attr对象，并设置新的属性值
+                Attr newAttr = document.createAttribute("sourceRef");
+                newAttr.setValue(newUserTaskTagId);
+                node.getAttributes().setNamedItem(newAttr);
+                break;
+            }
+        }
+        //创建新用户任务节点标签
+        Element userTaskTag = document.createElement("bpmn:userTask");
+        userTaskTag.setAttribute("id",newUserTaskTagId);
+        userTaskTag.setAttribute("name",userTaskTagName);
+        Element userTaskTagChild1 = document.createElement("bpmn:incoming");
+        userTaskTagChild1.setTextContent(newSequenceFlowId);
+        userTaskTag.appendChild(userTaskTagChild1);
+        Element userTaskTagChild2 = document.createElement("bpmn:outgoing");
+        userTaskTagChild2.setTextContent(sequenceFlowId);
+        userTaskTag.appendChild(userTaskTagChild2);
+        //创建新序列流标签
+        Element sequenceFlowTag = document.createElement("bpmn:sequenceFlow");
+        sequenceFlowTag.setAttribute("id",newSequenceFlowId);
+        sequenceFlowTag.setAttribute("sourceRef",previousId);
+        sequenceFlowTag.setAttribute("targetRef",newUserTaskTagId);
+
+        //修改上一节点bpmn:outgoing和下一节点bpmn:incoming
+        //获取bpmn:process节点
+        Element bpmnProcessEvent = XmlUtil.getElement(elementG,"bpmn:process");
+        NodeList bpmnProcessNextLevelEventList = bpmnProcessEvent.getChildNodes();
+        for (int i = 0; i < bpmnProcessNextLevelEventList.getLength(); i++) {
+            Node node = bpmnProcessNextLevelEventList.item(i);
+            //判断node是元素节点，并且是Element实例
+            if (node.getNodeType() == Node.ELEMENT_NODE && node instanceof Element) {
+                Element element = (Element) node;
+                String id = element.getAttribute("id");
+                if(id.equals(previousId)){
+                    Element elementOutgoing = XmlUtil.getElement(element,"bpmn:outgoing");
+                    elementOutgoing.setTextContent(newSequenceFlowId);
+                }
+                if(id.equals(nextTagId)){
+                    Element elementOutgoing = XmlUtil.getElement(element,"bpmn:incoming");
+                    elementOutgoing.setTextContent(sequenceFlowId);
+
+                    //插入标签
+                    Node parentNode = element.getParentNode();
+                    parentNode.insertBefore(userTaskTag,element);
+                    parentNode.insertBefore(sequenceFlowTag,element);
+                }
+            }
+        }
+        //将document对象转成字符串
+        TransformerFactory transformerFactory = TransformerFactory.newInstance();
+        Transformer transformer = transformerFactory.newTransformer();
+        DOMSource source = new DOMSource(document);
+        StreamResult result = new StreamResult(new StringWriter()); // 使用StringWriter来将结果输出为字符串
+        transformer.transform(source, result);
+        String data = result.getWriter().toString();
+        return data;
+    }
+
 }