简单封装jaxb2.0

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import java.io.StringReader;import java.io.StringWriter;import java.util.Collection;import java.util.concurrent.ConcurrentHashMap;import java.util.concurrent.ConcurrentMap;import javax.xml.bind.JAXBContext;import javax.xml.bind.JAXBElement;import javax.xml.bind.JAXBException;import javax.xml.bind.Marshaller;import javax.xml.bind.Unmarshaller;import javax.xml.bind.annotation.XmlAnyElement;import javax.xml.namespace.QName;import org.springframework.http.converter.HttpMessageConversionException;import org.springframework.util.Assert;import com.common.utils.Exceptions;import com.common.utils.Reflections;import com.common.utils.StringUtils;/** * 使用Jaxb2.0实现XML<->Java Object的Mapper. *  * 在创建时需要设定所有需要序列化的Root对象的Class. * 特别支持Root对象是Collection的情形. * */@SuppressWarnings("rawtypes")public class JaxbMapper {    private static ConcurrentMap<Class, JAXBContext> jaxbContexts = new ConcurrentHashMap<Class, JAXBContext>();    /**     * Java Object->Xml without encoding.     */    public static String toXml(Object root) {        Class clazz = Reflections.getUserClass(root);        return toXml(root, clazz, null);    }    /**     * Java Object->Xml with encoding.     */    public static String toXml(Object root, String encoding) {        Class clazz = Reflections.getUserClass(root);        return toXml(root, clazz, encoding);    }    /**     * Java Object->Xml with encoding.     */    public static String toXml(Object root, Class clazz, String encoding) {        try {            StringWriter writer = new StringWriter();            createMarshaller(clazz, encoding).marshal(root, writer);            return writer.toString();        } catch (JAXBException e) {            throw Exceptions.unchecked(e);        }    }    /**     * Java Collection->Xml without encoding, 特别支持Root Element是Collection的情形.     */    public static String toXml(Collection<?> root, String rootName, Class clazz) {        return toXml(root, rootName, clazz, null);    }    /**     * Java Collection->Xml with encoding, 特别支持Root Element是Collection的情形.     */    public static String toXml(Collection<?> root, String rootName, Class clazz, String encoding) {        try {            CollectionWrapper wrapper = new CollectionWrapper();            wrapper.collection = root;            JAXBElement<CollectionWrapper> wrapperElement = new JAXBElement<CollectionWrapper>(new QName(rootName),                    CollectionWrapper.class, wrapper);            StringWriter writer = new StringWriter();            createMarshaller(clazz, encoding).marshal(wrapperElement, writer);            return writer.toString();        } catch (JAXBException e) {            throw Exceptions.unchecked(e);        }    }    /**     * Xml->Java Object.     */    @SuppressWarnings("unchecked")    public static <T> T fromXml(String xml, Class<T> clazz) {        try {            StringReader reader = new StringReader(xml);            return (T) createUnmarshaller(clazz).unmarshal(reader);        } catch (JAXBException e) {            throw Exceptions.unchecked(e);        }    }    /**     * 创建Marshaller并设定encoding(可为null).     * 线程不安全，需要每次创建或pooling。     */    public static Marshaller createMarshaller(Class clazz, String encoding) {        try {            JAXBContext jaxbContext = getJaxbContext(clazz);            Marshaller marshaller = jaxbContext.createMarshaller();            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);            if (StringUtils.isNotBlank(encoding)) {                marshaller.setProperty(Marshaller.JAXB_ENCODING, encoding);            }            return marshaller;        } catch (JAXBException e) {            throw Exceptions.unchecked(e);        }    }    /**     * 创建UnMarshaller.     * 线程不安全，需要每次创建或pooling。     */    public static Unmarshaller createUnmarshaller(Class clazz) {        try {            JAXBContext jaxbContext = getJaxbContext(clazz);            return jaxbContext.createUnmarshaller();        } catch (JAXBException e) {            throw Exceptions.unchecked(e);        }    }    protected static JAXBContext getJaxbContext(Class clazz) {        Assert.notNull(clazz, "'clazz' must not be null");        JAXBContext jaxbContext = jaxbContexts.get(clazz);        if (jaxbContext == null) {            try {                jaxbContext = JAXBContext.newInstance(clazz, CollectionWrapper.class);                jaxbContexts.putIfAbsent(clazz, jaxbContext);            } catch (JAXBException ex) {                throw new HttpMessageConversionException("Could not instantiate JAXBContext for class [" + clazz                        + "]: " + ex.getMessage(), ex);            }        }        return jaxbContext;    }    /**     * 封装Root Element 是 Collection的情况.     */    public static class CollectionWrapper {        @XmlAnyElement        protected Collection<?> collection;    }}
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