用java实现:在下面xml中添加一本书的信息,用dom4j实现
<?xml version="1.0"?>
<library>
<book>
<id>b001</id>
<title>我是一个兵</title>
<author>大兵</author>
</book>
</library>
<?xml version="1.0"?>
<library>
<book>
<id>b001</id>
<title>我是一个兵</title>
<author>大兵</author>
</book>
</library>
book.xml文件
<?xml version="1.0" encoding="GBK"?>
<books>
<!--—An XML Example--><?target text?> <bookone title="XML study" publisher="angellove workers">
<article level="high" date="December-2007">
<title>Java configuration with XML</title>
<author>
<firstname>angel</firstname>
<lastname>free</lastname>
</author>
</article>
</bookone>
</books>import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.io.OutputFormat;
import org.dom4j.Element;
import org.dom4j.io.XMLWriter;
import java.io.*;import org.dom4j.Attribute;
import org.dom4j.DocumentException;
import org.dom4j.io.SAXReader;
import java.util.List;
import java.util.Iterator;import org.dom4j.QName;public class dom4j {
// 创建一个xml文件
public void changeXML() {
// 创建一个xml document对象
Document document = DocumentHelper.createDocument();
// 创建根节点元素
Element books = document.addElement("books");
// 给books添加注释
books.addComment("—An XML Example");
// 使用addProcessingInstruction()方法增加一个处理指令
books.addProcessingInstruction("target", "text");
// 在当前元素后增加一个子元素
Element bookone = books.addElement("bookone");
// 设置当前元素的属性
bookone.addAttribute("title", "XML study");
bookone.addAttribute("publisher", "angellove workers");
Element article = bookone.addElement("article");
article.addAttribute("level", "high");
article.addAttribute("date", "December-2007");
Element titleElement = article.addElement("title");
// 设置当前元素的文本值,即是内容
titleElement.setText("Java configuration with XML");
Element authorElement = article.addElement("author");
Element firstNameElement = authorElement.addElement("firstname");
firstNameElement.setText("angel");
Element lastNameElement = authorElement.addElement("lastname");
lastNameElement.setText("free");
// XML 声明 <?xml version="1.0" encoding="UTF-8"?> 自动添加到 XML 文档中。
try {
// 创建一个xml写入流,将生成的xml文件写入指定的文件中
// 使用优雅的方式写入(一共有三种方式:普通方式,优雅方式和紧凑方式)
//紧凑方式写入format = OutputFormat.createCompactFormat();
OutputFormat format = OutputFormat.createPrettyPrint();
format.setEncoding("GBK");
XMLWriter output = new XMLWriter(
new FileWriter(new File("books.xml")), format);
output.write(document);
output.close();
}
catch (IOException e) {
System.out.println(e.getMessage());
}
}
}