XML parsing sax parsing case (1) Read the contact.xml file and completely output the document content

1. Create a new Demo2 class:

import java.io.File;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

/**
 * 读取contact.xml文件，完整输出文档内容
 * @author APPle
 *
 */
public class Demo2 {

	public static void main(String[] args)throws Exception {
		//1.创建SAXParser
		SAXParser parser = SAXParserFactory.newInstance().newSAXParser();
		//2.读取xml文件
		MyDefaultHandler2 handler = new MyDefaultHandler2();
		parser.parse(new File("./src/contact.xml"), handler);
		String content = handler.getContent();
		System.out.println(content);
	}

}

2. Create a custom MyDefaulthander2

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
/**
 * SAX处理器程序
 * @author APPle
 */
public class MyDefaultHandler2 extends DefaultHandler {
	//存储xml文档信息
	private StringBuffer sb = new StringBuffer();
	
	//获取xml信息
	public String getContent(){
		return sb.toString();
	}
	

	/**
	 * 开始标签
	 */
	@Override
	public void startElement(String uri, String localName, String qName,
			Attributes attributes) throws SAXException {
		sb.append("<"+qName);
		//判断是否有属性
		if(attributes!=null){
			for(int i=0;i<attributes.getLength();i++){//int getLength() 返回此列表中的属性个数。 
				//得到属性名称   id="001"
				String attrName = attributes.getQName(i);//String getQName(int index) 通过索引查找属性的 XML 限定（前缀）名。 
				//得到属性值
				String attrValue = attributes.getValue(i);//String getValue(int index) 通过索引查找属性的值。 
				sb.append(" "+attrName+"=\""+attrValue+"\"");
			}
		}
		sb.append(">");
	}
	
	/**
	 * 文本内容
	 */
	@Override
	public void characters(char[] ch, int start, int length)
			throws SAXException {
		//得到当前读取的文本
		String content = new String(ch,start,length);
		sb.append(content);
	}
	
	/**
	 * 结束标签
	 */
	@Override
	public void endElement(String uri, String localName, String qName)
			throws SAXException {
		sb.append("</"+qName+">");
	}
}

Print output result:

<contactList>
    <contact id="001" name="eric">
        <name>张三</name>
        <age>20</age>
        <phone>134222223333</phone>
        <email>zhangsan@qq.com</email>
        <qq>432221111</qq>
    </contact>
    <contact id="002" name="jacky">
        <name>eric</name>
        <age>20</age>
        <phone>134222225555</phone>
        <email>lisi@qq.com</email>
        <qq>432222222</qq>
    </contact>
</contactList>

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