com.star.xml.JAXBUtil Maven / Gradle / Ivy

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package com.star.xml;

import java.io.File;
import java.io.InputStream;
import java.io.StringReader;
import java.io.StringWriter;
import java.util.HashMap;

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

import com.star.exception.pojo.ToolException;
import com.star.string.StringUtil;

/**
 * xml和对象互转,用的是jaxb
 * 
 * @author starhq
 *
 */
public final class JAXBUtil {

	private JAXBUtil() {
	}

	/**
	 * 缓存class和对象的jaxbcontext
	 */
	private static final ClassValue PROXY = new ClassValue() {

		/**
		 * 根据转进来的对象封装jaxbcontext
		 */
		@Override
		protected JAXBContext computeValue(final Class type) {
			JAXBContext jaxbContext = null;
			try {
				jaxbContext = JAXBContext.newInstance(new Class[] { type }, new HashMap());
			} catch (JAXBException e) {
				throw new ToolException(
						StringUtil.format("create jaxbcontext failure,the reason is: {}", e.getMessage()), e);
			}
			return jaxbContext;
		}
	};

	/**
	 * 对象转xml（单个对象）
	 */
	public static  String object2Xml(final Class clazzz, final T instatce, final boolean format) {
		final JAXBContext jaxbContext = PROXY.get(clazzz);
		final StringWriter stringWriter = new StringWriter();
		try {
			final Marshaller marshaller = jaxbContext.createMarshaller();
			if (format) {
				marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
			}
			marshaller.marshal(instatce, stringWriter);
		} catch (JAXBException e) {
			throw new ToolException(StringUtil.format("object to xml failure,the reason is: {}", e.getMessage()), e);
		}
		return stringWriter.toString();
	}

	/**
	 * xml转对象
	 * 
	 */
	@SuppressWarnings("unchecked")
	public static  T xml2Object(final Class clazzz, final String xml) {
		final JAXBContext jaxbContext = PROXY.get(clazzz);
		final StringReader stringReader = new StringReader(xml);
		try {
			final Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
			return (T) unmarshaller.unmarshal(stringReader);
		} catch (JAXBException e) {
			throw new ToolException(StringUtil.format("xml to object's failure the reason is: {}", e.getMessage()), e);
		}
	}

	/**
	 * 对象转xml持久化到文件
	 */
	public static  void object2File(final Class clazz, final T instance, final File file, final boolean format) {
		final JAXBContext jaxbContext = PROXY.get(clazz);
		try {
			final Marshaller marshaller = jaxbContext.createMarshaller();
			if (format) {
				marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
			}
			marshaller.marshal(instance, file);
		} catch (JAXBException e) {
			throw new ToolException(StringUtil.format(
					"object conver to xml,then persistence to file failure,the reason is: {}", e.getMessage()), e);
		}
	}

	/**
	 * 文件中xml还原成对象
	 */
	@SuppressWarnings("unchecked")
	public static  T fileToObject(final Class clazz, final File file) {
		final JAXBContext jaxbContext = PROXY.get(clazz);
		try {
			final Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
			return (T) unmarshaller.unmarshal(file);
		} catch (JAXBException e) {
			throw new ToolException(StringUtil.format("read xml from file then restore object failue,the reason is: {}",
					e.getMessage()), e);
		}
	}

	/**
	 * 输入流中的xml转成对象
	 */
	@SuppressWarnings("unchecked")
	public static  T streamToObject(final Class clazz, final InputStream inputStream) {
		final JAXBContext jaxbContext = PROXY.get(clazz);
		try {
			final Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
			return (T) unmarshaller.unmarshal(inputStream);
		} catch (JAXBException e) {
			throw new ToolException(
					StringUtil.format("input stream to object failure,the reason is: {}", e.getMessage()), e);
		}
	}
}