golang解析带命名空间的xml数据(带冒号的节点或属性名)

XML数据结构

<?xml version="1.0" encoding="UTF-8"?>
<bpmn:definitions xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:di="http://www.omg.org/spec/DD/20100524/DI" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" xmlns:zeebe="http://camunda.org/schema/zeebe/1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" id="Definitions_1" targetNamespace="http://bpmn.io/schema/bpmn" exporter="Zeebe Modeler" exporterVersion="0.1.0">
  <bpmn:process id="order-process" isExecutable="true">
    <bpmn:startEvent id="order-placed" name="Order Placed">
      <bpmn:outgoing>SequenceFlow_18tqka5</bpmn:outgoing>
    </bpmn:startEvent>
    <bpmn:endEvent id="order-delivered" name="Order Delivered">
      <bpmn:incoming>SequenceFlow_1qj94z0</bpmn:incoming>
    </bpmn:endEvent>
  </bpmn:process>
</bpmn:definitions>

解析(反序列化)

• 定义结构体

type bp struct {
	XMLName xml.Name `xml:"http://www.omg.org/spec/BPMN/20100524/MODEL definitions"`
	// <!--attributes start-->
	BPMN            string `xml:"bpmn,attr"`
	BPMNDI          string `xml:"bpmndi,attr"`
	DI              string `xml:"di,attr"`
	DC              string `xml:"dc,attr"`
	Zeebe           string `xml:"zeebe,attr"`
	XSI             string `xml:"xsi,attr"`
	ID              string `xml:"id,attr"`
	TargetNamespace string `xml:"targetNamespace,attr"`
	Exporter        string `xml:"exporter,attr"`
	ExporterVersion string `xml:"exporterVersion,attr"`
	// <!--attributes end-->
	Process struct {
		// <!--attributes start-->
		ID           string `xml:"id,attr"`
		Name         string `xml:"name,attr"`
		IsExecutable bool   `xml:"isExecutable,attr"`
		// <!--attributes end-->
		StartEvent struct {
			// <!--attributes start-->
			ID   string `xml:"id,attr"`
			Name string `xml:"name,attr"`
			// <!--attributes end-->
			Outgoing string `xml:"http://www.omg.org/spec/BPMN/20100524/MODEL outgoing"`
		} `xml:"http://www.omg.org/spec/BPMN/20100524/MODEL startEvent"`
		EndEvent struct {
			// <!--attributes start-->
			ID   string `xml:"id,attr"`
			Name string `xml:"name,attr"`
			// <!--attributes end-->
			Incoming string `xml:"http://www.omg.org/spec/BPMN/20100524/MODEL incoming"`
		} `xml:"http://www.omg.org/spec/BPMN/20100524/MODEL endEvent"`
	} `xml:"http://www.omg.org/spec/BPMN/20100524/MODEL process"`
}

• 解析

var target bp
err = xml.Unmarshal(bpmn, &target)
if err != nil {
	fmt.Println("parse xml file error: ", err)
}
fmt.Println("Print xml struct:")
fmt.Println(target, target.BPMNDI, target.ExporterVersion)
fmt.Println(target.Process.IsExecutable)
fmt.Println(target.Process.StartEvent.Outgoing)

序列化

值得注意的是，直接使用上面的bp结构体序列化为xml字符串会发现结果的结构与预期并不一致。golang playground

相关issue #9519

解决方案

解决方案是将序列化(Marshal)和反序列化(Unmarshal)的结构体分别定义。golang playground

• 定义结构体(仅修改了部分)

type bpEn struct {
	XMLName xml.Name `xml:"bpmn:definitions"` // <----- 修改
	// <!--attributes start-->
	BPMN            string `xml:"xmlns:bpmn,attr"` // <---- 修改
	BPMNDI          string `xml:"bpmndi,attr"`
	DI              string `xml:"di,attr"`
	DC              string `xml:"dc,attr"`
	Zeebe           string `xml:"zeebe,attr"`
	XSI             string `xml:"xsi,attr"`
	ID              string `xml:"id,attr"`
	TargetNamespace string `xml:"targetNamespace,attr"`
	Exporter        string `xml:"exporter,attr"`
	ExporterVersion string `xml:"exporterVersion,attr"`
	// <!--attributes end-->
	Process struct {
		// <!--attributes start-->
		ID           string `xml:"id,attr"`
		Name         string `xml:"name,attr"`
		IsExecutable bool   `xml:"isExecutable,attr"`
		// <!--attributes end-->
		StartEvent struct {
			// <!--attributes start-->
			ID   string `xml:"id,attr"`
			Name string `xml:"name,attr"`
			// <!--attributes end-->
			Outgoing string `xml:"http://www.omg.org/spec/BPMN/20100524/MODEL outgoing"`
		} `xml:"http://www.omg.org/spec/BPMN/20100524/MODEL startEvent"`
		EndEvent struct {
			// <!--attributes start-->
			ID   string `xml:"id,attr"`
			Name string `xml:"name,attr"`
			// <!--attributes end-->
			Incoming string `xml:"http://www.omg.org/spec/BPMN/20100524/MODEL incoming"`
		} `xml:"http://www.omg.org/spec/BPMN/20100524/MODEL endEvent"`
	} `xml:"http://www.omg.org/spec/BPMN/20100524/MODEL process"`
}

• 序列化

	bpmn := []byte(`<?xml version="1.0" encoding="UTF-8"?>
<bpmn:definitions xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:di="http://www.omg.org/spec/DD/20100524/DI" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" xmlns:zeebe="http://camunda.org/schema/zeebe/1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" id="Definitions_1" targetNamespace="http://bpmn.io/schema/bpmn" exporter="Zeebe Modeler" exporterVersion="0.1.0">
  <bpmn:process id="order-process" isExecutable="true">
    <bpmn:startEvent id="order-placed" name="Order Placed">
      <bpmn:outgoing>SequenceFlow_18tqka5</bpmn:outgoing>
    </bpmn:startEvent>
    <bpmn:endEvent id="order-delivered" name="Order Delivered">
      <bpmn:incoming>SequenceFlow_1qj94z0</bpmn:incoming>
    </bpmn:endEvent>
  </bpmn:process>
</bpmn:definitions>`)

	var en bpEn
	en.Process.IsExecutable = false
	en.Process.ID = "identity"
	en.Process.Name = "Hello Someone"
	en.Process.StartEvent.Outgoing = "xyz"
	enSt, err := xml.MarshalIndent(&en, "", "	")
	fmt.Println("原本结构:\n", string(bpmn), "\n", "序列化后结构:\n", string(enSt), err)
	return

参考文章：

https://blog.csdn.net/qq_24210767/article/details/102829205

https://studygolang.com/articles/5328

转载请注明原文地址：https://blog.keepchen.com/a/golang-parse-xml-with-namespace-prefix.html