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使用的相关包

<!-- https://mvnrepository.com/artifact/org.json/json -->
        <dependency>
            <groupId>org.json</groupId>
            <artifactId>json</artifactId>
            <version>20211205</version>
        </dependency>

遇到的问题 NoSuchMethodError

解决方案： https://stackoverflow.com/questions/52371365/nosuchmethod-error-when-using-org-json-to-convert-xml-to-json

Exception in thread "main" java.lang.NoSuchMethodError: org.json.JSONTokener.<init>(Ljava/io/Reader;)V
	at org.json.XMLTokener.<init>(XMLTokener.java:57)
	at org.json.XML.toJSONObject(XML.java:675)
	at org.json.XML.toJSONObject(XML.java:733)
	at org.json.XML.toJSONObject(XML.java:602)
	at com.example.demo.TestXml.test2(TestXml.java:21)
	at com.example.demo.TestXml.main(TestXml.java:17)

案例

// xml 转换为 json
XMLSerializer xmlSerializer = new XMLSerializer();
JSON read = xmlSerializer.read(xml);
System.out.println(read.toString());

// json 转换为 xml
String write = xmlSerializer.write(read);
System.out.println(write);