/**
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* Copyright © 2015-2020 <a href="http://www.jeeplus.org/">JeePlus</a> All rights reserved.
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*/
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package com.jeeplus.common.mapper;
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import java.io.StringReader;
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import java.io.StringWriter;
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import java.util.Collection;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ConcurrentMap;
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import javax.xml.bind.JAXBContext;
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import javax.xml.bind.JAXBElement;
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import javax.xml.bind.JAXBException;
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import javax.xml.bind.Marshaller;
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import javax.xml.bind.Unmarshaller;
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import javax.xml.bind.annotation.XmlAnyElement;
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import javax.xml.namespace.QName;
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import org.springframework.http.converter.HttpMessageConversionException;
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import org.springframework.util.Assert;
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import com.jeeplus.common.utils.Exceptions;
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import com.jeeplus.common.utils.Reflections;
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import com.jeeplus.common.utils.StringUtils;
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/**
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* 使用Jaxb2.0实现XML<->Java Object的Mapper.
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*
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* 在创建时需要设定所有需要序列化的Root对象的Class.
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* 特别支持Root对象是Collection的情形.
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*
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* @author calvin
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* @version 2013-01-15
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*/
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@SuppressWarnings("rawtypes")
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public class JaxbMapper {
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private static ConcurrentMap<Class, JAXBContext> jaxbContexts = new ConcurrentHashMap<Class, JAXBContext>();
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/**
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* Java Object->Xml without encoding.
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*/
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public static String toXml(Object root) {
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Class clazz = Reflections.getUserClass(root);
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return toXml(root, clazz, null);
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}
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/**
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* Java Object->Xml with encoding.
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*/
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public static String toXml(Object root, String encoding) {
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Class clazz = Reflections.getUserClass(root);
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return toXml(root, clazz, encoding);
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}
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/**
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* Java Object->Xml with encoding.
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*/
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public static String toXml(Object root, Class clazz, String encoding) {
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try {
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StringWriter writer = new StringWriter();
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createMarshaller(clazz, encoding).marshal(root, writer);
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return writer.toString();
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} catch (JAXBException e) {
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throw Exceptions.unchecked(e);
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}
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}
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/**
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* Java Collection->Xml without encoding, 特别支持Root Element是Collection的情形.
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*/
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public static String toXml(Collection<?> root, String rootName, Class clazz) {
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return toXml(root, rootName, clazz, null);
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}
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/**
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* Java Collection->Xml with encoding, 特别支持Root Element是Collection的情形.
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*/
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public static String toXml(Collection<?> root, String rootName, Class clazz, String encoding) {
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try {
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CollectionWrapper wrapper = new CollectionWrapper();
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wrapper.collection = root;
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JAXBElement<CollectionWrapper> wrapperElement = new JAXBElement<CollectionWrapper>(new QName(rootName),
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CollectionWrapper.class, wrapper);
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StringWriter writer = new StringWriter();
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createMarshaller(clazz, encoding).marshal(wrapperElement, writer);
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return writer.toString();
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} catch (JAXBException e) {
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throw Exceptions.unchecked(e);
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}
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}
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/**
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* Xml->Java Object.
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*/
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@SuppressWarnings("unchecked")
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public static <T> T fromXml(String xml, Class<T> clazz) {
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try {
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StringReader reader = new StringReader(xml);
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return (T) createUnmarshaller(clazz).unmarshal(reader);
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} catch (JAXBException e) {
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throw Exceptions.unchecked(e);
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}
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}
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/**
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* 创建Marshaller并设定encoding(可为null).
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* 线程不安全，需要每次创建或pooling。
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*/
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public static Marshaller createMarshaller(Class clazz, String encoding) {
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try {
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JAXBContext jaxbContext = getJaxbContext(clazz);
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Marshaller marshaller = jaxbContext.createMarshaller();
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marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
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if (StringUtils.isNotBlank(encoding)) {
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marshaller.setProperty(Marshaller.JAXB_ENCODING, encoding);
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}
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return marshaller;
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} catch (JAXBException e) {
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throw Exceptions.unchecked(e);
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}
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}
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/**
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* 创建UnMarshaller.
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* 线程不安全，需要每次创建或pooling。
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*/
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public static Unmarshaller createUnmarshaller(Class clazz) {
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try {
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JAXBContext jaxbContext = getJaxbContext(clazz);
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return jaxbContext.createUnmarshaller();
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} catch (JAXBException e) {
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throw Exceptions.unchecked(e);
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}
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}
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protected static JAXBContext getJaxbContext(Class clazz) {
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Assert.notNull(clazz, "'clazz' must not be null");
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JAXBContext jaxbContext = jaxbContexts.get(clazz);
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if (jaxbContext == null) {
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try {
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jaxbContext = JAXBContext.newInstance(clazz, CollectionWrapper.class);
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jaxbContexts.putIfAbsent(clazz, jaxbContext);
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} catch (JAXBException ex) {
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throw new HttpMessageConversionException("Could not instantiate JAXBContext for class [" + clazz
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+ "]: " + ex.getMessage(), ex);
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}
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}
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return jaxbContext;
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}
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/**
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* 封装Root Element 是 Collection的情况.
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*/
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public static class CollectionWrapper {
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@XmlAnyElement
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protected Collection<?> collection;
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}
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}
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