DOM4J解析XML

一：要导入的包
dom4j-1.6.1.jar
jaxen-1.1-bata-6.jar
二：源码
package com;

 

import java.io.File;

import java.io.FileWriter;

import java.io.IOException;

import java.util.List;

 

import org.dom4j.Document;

import org.dom4j.DocumentException;

import org.dom4j.DocumentHelper;

import org.dom4j.Element;

import org.dom4j.io.SAXReader;

import org.dom4j.io.XMLWriter;

/**

* 该类主要用于测试dom4j创建xml文件和解析xml文件

* 创建xml文件： 1.通过新建document创建，如write1

* 2.解析定义好的xml字符串，如write2

* 解析xml文件：读取xml文件，通过遍历节点找到节点的属性和属性值。

* @author zhourm

*

*/

public class TestReadWrite {

public static void main(String[] args) {

TestReadWrite test = new TestReadWrite();

String roadStr = "D:/createXMLtest.xml";

//test.write1(roadStr);

test.write2(roadStr);

test.read(roadStr);

}

public void write1(String roadStr){

System.out.println("写xml方法一");

 

Document document = DocumentHelper.createDocument();

Element documentElement = document.addElement("document");

documentElement.addAttribute("action", "UP");

documentElement.addAttribute("count", "2");

documentElement.addElement("metaid").addAttribute("id", "ISBN7-200-04263-3").setText("test1");

documentElement.addElement("metaid").addAttribute("id", "u.meta20101228２４－０７７６３－１／ＴＳ·２５0qesu100").setText("test2");

try{

XMLWriter output = new XMLWriter(

new FileWriter( new File(roadStr) ));

output.write( document );

output.close();

}

catch(IOException e){System.out.println(e.getMessage());}

}

public void write2(String roadStr){

System.out.println("写xml方法二");

 

String xml =

"<?xml version=\"1.0\" encoding=\"UTF-8\" ?> "+

"<document action=\"UP\" count=\"2\">"+

"<metaid id=\"ISBN7-200-04263-3\" />"+

"<metaid id=\"u.meta20101228２４－０７７６３－１／ＴＳ·２５0qesu100\" />"+

"</document>";

 

Document document;

try {

document = DocumentHelper.parseText(xml);

try{

XMLWriter output = new XMLWriter(

new FileWriter( new File(roadStr) ));

output.write( document );

output.close();

}

catch(IOException e){System.out.println(e.getMessage());}

} catch (DocumentException e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

}

}

public void read(String roadStr) {

//根据路径读取xml数据

File inputXml = new File(roadStr);

SAXReader saxReader = new SAXReader();

Document srcDoc;

// 解析元数据

List nodes ;

try {

srcDoc = saxReader.read(inputXml);

nodes = srcDoc.selectNodes("//metaid");

//若解析失败

if (null == nodes || nodes.isEmpty()) {

//若解析到的id为空则提示错误信息

System.out.println("解析错误");

}else{

//若解析成功

int i = 0;

for (Object obj : nodes) {

i ++;

Element metaIdElement = (Element) obj;

//获取节点的id属性值

String mataId = metaIdElement.attributeValue("id");

System.out.println("节点的属性ID取值为："+mataId);

String mataValue = metaIdElement.getTextTrim();

System.out.println("节点的值为："+mataValue);

}

System.out.println("获取到的节点个数为："+i);

}

} catch (DocumentException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}