Castor中Unmarshaller与Marshaller的具体用法

 

1.castor简介

castor是一种将java对象和XML自动绑定的开源软件。它可以在java对象、XML文本、SQL数据表以及LDAP目录之间绑定。Castor几乎是JAXB的替代品。Castor是ExoLab Group下面的一个开放源代码的项目，它主要实现的是O/R映射功能。它主要API和数据接口为：JDO-like, SQL, OQL, JDBC, LDAP, XML, DSML。它支持分布式目录事务处理和时间；提供处理XML、Directory、XADirectory的类库，提供从XML到JAVA类的转换机制。Castor（http://castor.exolab..org/）是一种将Java对象和XML自动绑定的开源软件。它可以在Java对象、XML文本、SQL数据表以及LDAP目录之间绑定。

 

2.下载需要用到的jar包

castor-1.0.1-xml.jar包下载地址：

http://www.castor.org/download.html

xercesImpl.jar包下载地址：

http://archive.apache.org/dist/xml/xerces-j/

 

本文提供了两种包的下载，可以下载测试看看

 

 

3.使用方法

 

基本的bean：

public class FlightBean {

	private String m_carrier;
	private int m_number;
	private String m_departure;
	private String m_arrival;

	public FlightBean() {
	}

	public void setCarrier(String carrier) {
		m_carrier = carrier;
	}

	public String getCarrier() {
		return m_carrier;
	}

	public void setNumber(int number) {
		m_number = number;
	}

	public int getNumber() {
		return m_number;
	}

	public void setDepartureTime(String time) {
		m_departure = time;
	}

	public String getDepartureTime() {
		return m_departure;
	}

	public void setArrivalTime(String time) {
		m_arrival = time;
	}

	public String getArrivalTime() {
		return m_arrival;
	}
}

  使用的mapping的匹配方式，XML的mapping方式：

 

<!DOCTYPE databases PUBLIC
"-//EXOLAB/Castor Mapping DTD Version 1.0//EN"
"http://castor.exolab.org/mapping.dtd">

<mapping>
	<description>Basic mapping example</description>
	<class name="FlightBean" auto-complete="true">
		<map-to xml="flight"/>
		<field name="carrier">
			<bind-xml name="carrier" node="attribute"/>
		</field>
		<field name="departureTime">
			<bind-xml name="depart" node="attribute"/>
		</field>
		<field name="arrivalTime">
			<bind-xml name="arrive" node="attribute"/>
		</field>
	</class>
</mapping>

 书写测试类，实现Unmarshaller与Marshaller的具体用法

 

import java.io.*;

import org.exolab.castor.mapping.Mapping;
import org.exolab.castor.mapping.MappingException;
import org.exolab.castor.xml.*;

public class FlightBeanMapTest {
	public static void main(String[] argv) {
		// build a test bean
		FlightBean bean = new FlightBean();
		bean.setCarrier("AR");
		bean.setNumber(426);
		bean.setDepartureTime("6:23a");
		bean.setArrivalTime("8:42a");
		try {
			// write it out as XML (if not already present)
			Mapping map = new Mapping();
			map.loadMapping("FlightBeanMapTestmapping.xml");
			File file = new File("test.xml");
			Writer writer = new FileWriter(file);
			Marshaller marshaller = new Marshaller(writer);
			marshaller.setMapping(map);
			marshaller.marshal(bean);
			// now restore the value and list what we get
			Reader reader = new FileReader(file);
			Unmarshaller unmarshaller = new Unmarshaller(map);
			FlightBean read = (FlightBean) unmarshaller.unmarshal(reader);
			System.out.println("Flight " + read.getCarrier() + read.getNumber()
					+ " departing at " + read.getDepartureTime()
					+ " and arriving at " + read.getArrivalTime());
		} catch (IOException ex) {
			ex.printStackTrace(System.err);
		} catch (MarshalException ex) {
			ex.printStackTrace(System.err);
		} catch (ValidationException ex) {
			ex.printStackTrace(System.err);
		} catch (MappingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}