Java解析 xml

DOM:树结构 跨语言 不局限于Java 全程在内存中
SAX:事件驱动模式 省内存
JDOM: java常用解析xml的包 API相对友好
DOM4J:java常用解析xml的包 基于JDOM 性能方面也优秀  开源   推荐用此包


<!-- dom4j -->
<dependency>
    <groupId>dom4j</groupId>
    <artifactId>dom4j</artifactId>
    <version>1.6.1</version>
</dependency>

package com.bc.mcode;

import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;

import org.dom4j.io.XMLWriter;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

public class Test {

    private static class IgnoreDTDEntityResolver implements EntityResolver {
        @Override
        public InputSource resolveEntity(String publicId, String systemId)
                throws SAXException, IOException {
            return new InputSource(new ByteArrayInputStream("<?xml version='1.0' encoding='UTF-8'?>".getBytes()));
        }

    }

    public static void main(String[] args) {
        try {
            SAXReader reader = new SAXReader();
            reader.setEntityResolver(new IgnoreDTDEntityResolver()); // ignore dtd

//            Document document = reader.read(new File("E:\\ccbckj\\download\\xml\\demo.xml")); // load

            String str = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><!DOCTYPE cn-application-body SYSTEM \"/dtdandxsl/cn-application-body-20080416.dtd\">xxxx"; // 或者通过字符串加载
            Document document = reader.read(new ByteArrayInputStream(str.getBytes(StandardCharsets.UTF_8))); // load

            Element rootElement = document.getRootElement();

            Iterator iterator = rootElement.elementIterator();
            while (iterator.hasNext()){
                Element item = (Element) iterator.next();
                List<Attribute> attributes = item.attributes();

                for (Attribute attribute : attributes) {
                    System.out.println("==>" + attribute.getValue());
                }

                Iterator iterator1 = item.elementIterator();
                while (iterator1.hasNext()){
                    Element stuChild = (Element) iterator1.next();
                    System.out.println("节点名："+stuChild.getName()+"---节点值："+stuChild.getStringValue());
                }
            }

            
            // 下面的参考代码是复制 这个xml为一个新的xml
            OutputFormat format = OutputFormat.createPrettyPrint();
            format.setEncoding("UTF-8");
            XMLWriter xmleriter = new XMLWriter(new FileOutputStream("E:\\ccbckj\\download\\temp\\c.xml"), format);
            xmleriter.write(document);
            xmleriter.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}