Java如何在JDOM中获得XML元素的混合内容？
以下示例演示如何读取xml元素的混合内容。混合内容可以具有多种类型的内容，例如文本（Text），注释（Comment），CDATA（CDATA）或某些子元素（Element）。
您还看到，可以像调用数据集一样通过调用remove方法来从元素中删除混合的内容List。
package org.nhooo.example.jdom;
import org.jdom2.*;
import org.jdom2.input.SAXBuilder;
import java.io.IOException;
import java.io.StringReader;
import java.util.List;
public class JDOMMixedContent {
public static void main(String[] args) {
String xml = "<root>" +
" <data>" +
" <!-- This element contains application data -->" +
" User Information" +
" <![CDATA[<table><tr><td>-data-</td></tr></table>]]>" +
" <field name=\"username\">alice</field>" +
" </data>" +
"</root>";
SAXBuilder builder = new SAXBuilder();
try {
Document document = builder.build(new StringReader(xml));
Element root = document.getRootElement();
Element data = root.getChild("data");
//读取xml元素的混合内容并进行迭代
//结果列表。此列表对象可以包含任何
//以下对象：Comment，Element，CDATA，DocType，
//ProcessingInstruction，EntityRef和Text。
List content = data.getContent();
for (Object o : content) {
if (o instanceof Comment) {
Comment comment = (Comment) o;
System.out.println("Comment = " + comment);
} else if (o instanceof Element) {
Element element = (Element) o;
System.out.println("Element = " + element);
} else if (o instanceof CDATA) {
CDATA cdata = (CDATA) o;
System.out.println("CDATA = " + cdata);
} else if (o instanceof DocType) {
DocType docType = (DocType) o;
System.out.println("DocType = " + docType);
} else if (o instanceof ProcessingInstruction) {
ProcessingInstruction pi = (ProcessingInstruction) o;
System.out.println("PI = " + pi);
} else if (o instanceof EntityRef) {
EntityRef entityRef = (EntityRef) o;
System.out.println("EntityRef = " + entityRef);
} else if (o instanceof Text) {
Text text = (Text) o;
System.out.println("Text = " + text);
}
}
//删除第二个混合内容，即CDATA内容。
content.remove(2);
} catch (JDOMException | IOException e) {
e.printStackTrace();
}
}
}这是我们程序的结果：
Text = [Text: ] Comment = [Comment: <!-- This element contains application data -->] Text = [Text: User Information ] CDATA = [CDATA: <table><tr><td>-data-</td></tr></table>] Text = [Text: ] Element = [Element: <field/>] Text = [Text: ]
Maven依赖
<!-- https://search.maven.org/remotecontent?filepath=org/jdom/jdom2/2.0.6/jdom2-2.0.6.jar -->
<dependency>
<groupId>org.jdom</groupId>
<artifactId>jdom2</artifactId>
<version>2.0.6</version>
</dependency>