java中使用dom4j写xml文件和简单教程

下载 dom4j-1.6.1.jar。

1: package org.zzp.common.xml.dom4j;

  2: 

  3: import java.io.FileWriter;

  4: import java.io.IOException;

  5: import org.dom4j.Document;

  6: import org.dom4j.DocumentHelper;

  7: import org.dom4j.Element;

  8: import org.dom4j.io.OutputFormat;

  9: import org.dom4j.io.XMLWriter;

 10: 

 11: public class Dom4jDemo {

 12: 	public static void main(String[] args) {

 13: 		Document doc=DocumentHelper.createDocument();

 14: 		Element root=doc.addElement("students");

 15: 		Element s1=root.addElement("student");

 16: 		s1.addElement("id","1");

 17: 		Element name=s1.addElement("name","王建宙");

 18: 		name.addAttribute("sex", "非");

 19: 		OutputFormat format=OutputFormat.createPrettyPrint();

 20: 		format.setEncoding("gbk");

 21: 		try {

 22: 			XMLWriter out=new XMLWriter(new FileWriter("test.xml"),format);

 23: 			out.write(doc);

 24: 			out.close();

 25: 		} catch (IOException e) {

 26: 			// TODO Auto-generated catch block

 27: 			e.printStackTrace();

 28: 		}

 29: 	}

 30: }

ok.我们来看看test.xml的内容

  1: <?xml version="1.0" encoding="gbk"?>

  2: 

  3: <students>

  4:   <student>

  5:     <id xmlns="1"/>

  6:     <name xmlns="王建宙" sex="非"/>

  7:   </student>

  8: </students>

。。。怎么会这样。。<id xmlns=”1” />怎么变这样的

我要的是“<id>1</id>”啊。。

那么正确的应该怎么写呢。。我们来看看

  1: package org.zzp.common.xml.dom4j;

  2: 

  3: import java.io.FileWriter;

  4: import java.io.IOException;

  5: import org.dom4j.Document;

  6: import org.dom4j.DocumentHelper;

  7: import org.dom4j.Element;

  8: import org.dom4j.io.OutputFormat;

  9: import org.dom4j.io.XMLWriter;

 10: 

 11: public class Dom4jDemo {

 12: 	public static void main(String[] args) {

 13: 		Document doc=DocumentHelper.createDocument();

 14: 		Element root=doc.addElement("students");

 15: 		Element s1=root.addElement("student");

 16: 		s1.addElement("id").setText("1");

 17: 		Element name=s1.addElement("name");

 18: 		name.setText("王建宙");

 19: 		name.addAttribute("sex","非");

 20: 		OutputFormat format=OutputFormat.createPrettyPrint();

 21: 		format.setEncoding("gbk");

 22: 		try {

 23: 			XMLWriter out=new XMLWriter(new FileWriter("test.xml"),format);

 24: 			out.write(doc);

 25: 			out.close();

 26: 		} catch (IOException e) {

 27: 			// TODO Auto-generated catch block

 28: 			e.printStackTrace();

 29: 		}

 30: 	}

 31: }

好了，现在正常了。这个错误是我犯的。我自己猜想addElement(“name”,”value” )。原来这样是不对的。至于那个xmlns好像是命名空间吧，我也不懂，不管他。