[java] Web APIをJAXBで取得するためのクラス

WebAPI.java

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.HashMap;
import java.util.Map;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;


public class WebAPI {

	private URL url;

	private Map<String, String> headers = new HashMap<String, String>();

	private int timeout;

	public WebAPI() {

	}

	public WebAPI(URL url) {
		this.url = url;
	}

	public void setHeader(String key, String value) {
		headers.put(key, value);
	}

	public void setTimeout(int timeout) {
		this.timeout = timeout;
	}

	@SuppressWarnings("unchecked")
	public <T> T request(Class<T> clazz) {
		InputStream inputStream = null;
		try {
			URLConnection connection = url.openConnection();
			connection.setReadTimeout(timeout);
			for (Map.Entry<String, String> e : headers.entrySet()) {
				connection.setRequestProperty(e.getKey(), e.getValue());
			}

			inputStream = connection.getInputStream();

			JAXBContext jc = JAXBContext.newInstance(clazz.getPackage().getName());
			Unmarshaller unmarshaller = jc.createUnmarshaller();

			Object obj = unmarshaller.unmarshal(inputStream);
			return (T) obj;
		} catch (IOException e) {
			e.printStackTrace();
		} catch (JAXBException e) {
			e.printStackTrace();
		} finally {
			if (inputStream != null) {
				try {
					inputStream.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		return null;
	}

//	public static void main(String[] args) throws Exception {
//		WebAPI api = new WebAPI(new URL("http://zip.cgis.biz/xml/zip.php?zn=1080023"));
//		ZIPResult result = api.request(ZIPResult.class);
//		System.out.println(result.getResult().get(0).getName()); // ZipSearchXML
//		System.out.println(result.getResult().get(1).getVersion()); // 1.01
//	}
}

zip.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema
		xmlns:xsd="http://www.w3.org/2001/XMLSchema"
		elementFormDefault="qualified">

	<!-- 簡単のため全ては書いてませんが、name, version取るだけならこれでok -->

	<xsd:element name="ZIP_result">
		<xsd:complexType>
			<xsd:sequence>
				<xsd:element name="result" type="result" maxOccurs="unbounded"/>
			</xsd:sequence>
		</xsd:complexType>
	</xsd:element>

	<xsd:complexType name="result">
		<xsd:simpleContent>
			<xsd:extension base="xsd:string">
				<xsd:attribute name="name" type="xsd:string"/>
				<xsd:attribute name="version" type="xsd:string"/>
			</xsd:extension>
		</xsd:simpleContent>
	</xsd:complexType>

</xsd:schema>