Digester 解析xml Sample

最新推荐文章于 2020-07-16 08:34:10 发布

最新推荐文章于 2020-07-16 08:34:10 发布 · 153 阅读

文章标签：

#XML #Java #Apache

本文介绍使用Apache Commons Digester库解析XML文件并映射到Java对象的方法。通过具体示例展示了如何定义Java类来匹配XML结构，以及如何利用Digester进行解析。

foobar.xml

<?xml version="1.0"?>
<foo name="The Parent" page="123">
	<bar id="123" title="The First Child" />
	<bar id="456" title="The Second Child" />
</foo>

Foo.java

package digesterfoobar;

import java.util.Iterator;
import java.util.Vector;

public class Foo {

	private Vector<Bar> barVector;
	private String name;
	private String page;

	public Foo() {
		barVector = new Vector<Bar>();
	}

	public void addBar(Bar bar) {
		barVector.add(bar);
	}

	public Iterator getBars() {
		return barVector.iterator();
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getPage() {
		return page;
	}

	public void setPage(String page) {
		this.page = page;
	}

}

Bar.java

package digesterfoobar;

import org.apache.commons.lang.builder.ToStringBuilder;

public class Bar {

	private int id;
	private String title;

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getTitle() {
		return title;
	}

	public void setTitle(String title) {
		this.title = title;
	}
	
	@Override
	public String toString() {
		return ToStringBuilder.reflectionToString(this);
	}

}

Client.java

package digesterfoobar;

import java.io.IOException;

import org.apache.commons.digester.Digester;
import org.apache.commons.lang.builder.ToStringBuilder;
import org.xml.sax.SAXException;

public class Client {

	/**
	 * @param args
	 * @throws SAXException 
	 * @throws IOException 
	 */
	public static void main(String[] args) throws IOException, SAXException {
		Digester digester = new Digester();
		digester.addObjectCreate("foo", Foo.class);
		digester.addSetProperties("foo");
		
		digester.addObjectCreate("foo/bar", Bar.class);
		digester.addSetProperties("foo/bar");
		digester.addSetNext("foo/bar", "addBar");
		
		Foo foo = (Foo) digester.parse(Client.class.getResourceAsStream("foobar.xml"));
		System.out.println(ToStringBuilder.reflectionToString(foo));
	}

}

digester.addSetProperties("foo");会处理foo的所有属性

digester.addSetNext("foo/bar", "addBar");处理下一个