先获取到节点,然后在节点山添加Element
添加节点 添加属性 设置开始标签与结束标签的值

book.addElement("描述").addAttribute("name", "xxxxxx").setText("一本好书!");

解决中文乱码问题:

  输出流最好用字节流(Stream),字节流可以控制编码格式,Writer是字符流。

  如果xml中编码是utf-8,格式器也用utf-8。格式器与xml文档的编码格式要一致。

 package Dom4j_XMLParser;

 import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter; import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import org.junit.Test; public class Demo2 { // 在第一本书后增加一个 <描述 name="xxxxxx">一本好书!</描述>
@Test
public void test1() throws Exception {
// 创建SAX读取器
SAXReader reader = new SAXReader();
// 加载文档
Document document = reader.read(new File("src/book.xml"));
// 获取根节点(书架)
Element root = document.getRootElement();
// 获取根节点下的书节点,带s返回一个数组,再取数组的第二个
Element book = (Element) root.elements("书").get(0);
// 获取树下面的书名属性
book.addElement("描述").addAttribute("name", "xxxxxx").setText("一本好书!"); // 格式化输出流,同时指定编码格式。也可以在FileOutputStream中指定。
OutputFormat format = OutputFormat.createPrettyPrint();
format.setEncoding("utf-8"); XMLWriter writer = new XMLWriter(new FileOutputStream("src/book.xml"),format);
writer.write(document);
writer.close();
} }

结果:

aaarticlea/png;base64,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" alt="" />

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