org.dom4j.IllegalAddException: No such namespace prefix: *** is in scope on: org.dom4j.tree.DefaultElement （dom4j写入XML文件，标签中带【:】(冒号)解决办法）

用dom4j操作写XML文件，标签中含有冒号，会报 org.dom4j.IllegalAddException: No such namespace prefix: *** is in scope on: org.dom4j.tree.DefaultElement错误，大致意思就是说，冒号前面的内容是未定义的命名空间，那么我们就帮它定义一下，问题即可解决，看下面例子：

这是我需要生成的XML，标签包含 ofd:

<?xml version="1.0" encoding="UTF-8"?>
<ofd:Signature xmlns:ofd="http://www.ofdspec.org/2016">
    <ofd:SignedInfo>
        <ofd:Provider ProviderName="Eseal" Company="XXX" Version="1.0"/>
        <ofd:SignatureMethod>123456789</ofd:SignatureMethod>
        <ofd:SignatureDataTime>988746454656</ofd:SignatureDataTime>
        <ofd:Reference FileRef="文件地址">
            <ofd:CheckValue>qqqqqqqqqqqqqqqqqqqqq</ofd:CheckValue>
        </ofd:Reference>
        <ofd:StampAmot PageRef="1" ID="index" Boundary="10.0 20.0 30.0 40.0"/>
        <ofd:Seal>
            <ofd:BaseLoc>Seal.esl</ofd:BaseLoc>
        </ofd:Seal>
    </ofd:SignedInfo>
    <ofd:SignedValue>SignedValue.dat</ofd:SignedValue>
</ofd:Signature>

代码操作的时候，在根节点用

addNamespace("name","dnsURL")

添加命名空间即可,代码比较简单，不做赘述：

import java.io.FileWriter;
import java.io.IOException;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;

public class generateXMLTest{
    
    public static void main(String[] args) {
        generateSignature("E:\\test.xml");
    }

    public static void generateSignature(String fileAddress) {
        FileWriter out = null;
        try {
            out = new FileWriter(fileAddress);
            createDocument().write(out);
            OutputFormat format = OutputFormat.createPrettyPrint();
            format.setEncoding("UTF-8");
            XMLWriter writer = new XMLWriter(System.out, format);//设置XML编码
            writer.write(createDocument());
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    public static Document createDocument() {
        Document document = DocumentHelper.createDocument();

        Element root = document.addElement("ofd:Signature")
                .addAttribute("xmlns:ofd","http://www.ofdspec.org/2016").addNamespace("ofd", "http://www.ofdspec.org/2016");//在此为ofd:添加命名空间
        
        Element SignedInfo = root.addElement("ofd:SignedInfo");

        Element Provider = SignedInfo.addElement("ofd:Provider")
                .addAttribute("ProviderName", "Eseal")
                .addAttribute("Company", "XXX")
                .addAttribute("Version", "1.0");
        
        Element SignatureMethod = SignedInfo.addElement("ofd:SignatureMethod");
                SignatureMethod.setText("123456789");
        Element SignatureDataTime = SignedInfo.addElement("ofd:SignatureDataTime");
                SignatureDataTime.setText("988746454656");
        Element    Reference = SignedInfo.addElement("ofd:Reference")
                .addAttribute("FileRef", "文件地址");
        Element CheckValue = Reference.addElement("ofd:CheckValue");
                CheckValue.setText("qqqqqqqqqqqqqqqqqqqqq");
        Element StampAmot = SignedInfo.addElement("ofd:StampAmot")
                .addAttribute("PageRef", "1")
                .addAttribute("ID", "index")
                .addAttribute("Boundary", "10.0 20.0 30.0 40.0");
        Element BaseLoc = SignedInfo.addElement("ofd:Seal").addElement("ofd:BaseLoc");
                BaseLoc.setText("Seal.esl");
        Element SignedValue = root.addElement("ofd:SignedValue");
                SignedValue.setText("SignedValue.dat");
        return document;
    }

}