maven中使用dom4j解析、生成XML的简易方法

此片文章主要写一些关于如何在maven工程中使用dom4j来解析或生成XML的建议方法，实际可使用的写法不仅限于如下所写的样例代码。此处进攻快速入手和提供思路使用。

首先配置pom.xml中的依赖的包

    <dependencies>
        <dependency>
            <groupId>dom4j</groupId>
            <artifactId>dom4j</artifactId>
            <version>1.6.1</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
        </dependency>
        <dependency>
            <groupId>jaxen</groupId>
            <artifactId>jaxen</artifactId>
            <version>1.1.6</version>
        </dependency>
    </dependencies>

上述配置中jaxen的包主要在使用Xpath时会被用到。

需要解析的样例XML文件

<?xml version="1.0" encoding="UTF-8" ?>
<resources>
    <product name="QQ">
        <account id="123456789">
            <nickname>qq-account-1</nickname>
            <password>qwe123qwe123</password>
            <level>56</level>
        </account>
        <account id="987654321">
            <nickname>qq-account-2</nickname>
            <password>ios9ios9ios9</password>
            <level>12</level>
        </account>
    </product>
    <product name="Netease">
        <account id="tom">
            <password>pwdOfTom</password>
            <capacity>1024</capacity>
        </account>
        <account name="Jim">
            <password>pwdOfJim</password>
            <capacity>2560</capacity>
        </account>
    </product>
</resources>

解析的java类

package com.jeremy;

import org.dom4j.*;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import org.dom4j.xpath.DefaultXPath;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

/**
 * Created by jeremysong on 1/7/2016.
 */
public class DomParser
{
    public static List<String> parseMethod1() throws DocumentException
    {
        List<String> result = new ArrayList<String>();

        SAXReader reader = new SAXReader();
        Document document = reader.read("E:\\IdeaProjects\\Example\\NetApp\\src\\main\\resources\\target.xml");
        XPath xPath = new DefaultXPath("/resources/product[@name='QQ']/account[@id='987654321']/password");
        List<Element> list = xPath.selectNodes(document.getRootElement());
        for (Element element : list)
        {
            System.out.println(element.getTextTrim());
            result.add(element.getTextTrim());
        }
        return result;
    }

    public static List<String> parseMethod2() throws DocumentException
    {
        List<String> result = new ArrayList<String>();

        SAXReader reader = new SAXReader();
        Document document = reader.read("E:\\IdeaProjects\\Example\\NetApp\\src\\main\\resources\\target.xml");
        List<Element> products = document.getRootElement().selectNodes("/resources/product");
        Iterator iterator = products.iterator();
        while (iterator.hasNext())
        {
            Element product = (Element) iterator.next();
            String name = product.attributeValue("name");
            System.out.println(name);
        }
        return result;
    }

    public static void generate()
    {
        Document doc = DocumentHelper.createDocument();
        Element root = doc.addElement("resources");

        Element product = root.addElement("product");
        product.addAttribute("name", "QQ");

        Element account = product.addElement("account");
        account.addAttribute("id", "123456789");

        Element nickname = account.addElement("nickname");
        nickname.setText("QQ-account-1");

        Element password = account.addElement("password");
        password.setText("123asd21qda");

        Element level = account.addElement("level");
        level.setText("56");

        PrintWriter pWriter = null;
        XMLWriter xWriter = null;
        try
        {
            pWriter = new PrintWriter("E:\\IdeaProjects\\Example\\NetApp\\src\\main\\generate.xml");
            xWriter = new XMLWriter(pWriter);
            xWriter.write(doc);
        } catch (Exception e)
        {
            e.printStackTrace();
        } finally
        {
            try
            {
                xWriter.flush();
                xWriter.close();
            } catch (IOException e)
            {
                e.printStackTrace();
            }
        }
    }
}

测试类：

import com.jeremy.DomParser;
import org.dom4j.DocumentException;
import org.junit.Test;

/**
 * Created by jeremysong on 1/7/2016.
 */
public class TestDomParser
{
    @Test
    public void testParseMethod1() throws DocumentException
    {
        DomParser.parseMethod1();
    }

    @Test
    public void testParseMethod2() throws DocumentException
    {
        DomParser.parseMethod2();
    }

    @Test
    public void testGenerate()
    {
        DomParser.generate();
    }
}

测试结果：

testParseMethod1运行结果

testParseMethod2运行结果

testGenerate运行结果

<?xml version="1.0" encoding="UTF-8"?>
<resources>
    <product name="QQ">
        <account id="123456789">
            <nickname>QQ-account-1</nickname>
            <password>123asd21qda</password>
            <level>56</level>
        </account>
    </product>
</resources>