Jaxb解析器

package com.mx.tmc.core.util;


import java.io.StringReader;
import java.io.StringWriter;
import java.util.Collection;


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.apache.commons.lang3.StringUtils;


public class JAXBParser {


// 多线程安全的Context.
private JAXBContext jaxbContext;


/**
* @param types
*            所有需要序列化的Root对象的类型.
*/
public JAXBParser(Class<?> types) {
try {
jaxbContext = JAXBContext.newInstance(types);
} catch (JAXBException e) {
throw new RuntimeException(e);
}
}


/**
* Java Object->Xml.
*/
public String toXml(Object root, String encoding) {
try {
StringWriter writer = new StringWriter();
createMarshaller(encoding).marshal(root, writer);
return writer.toString();
} catch (JAXBException e) {
throw new RuntimeException(e);
}
}


/**
* Java Object->Xml, 特别支持对Root Element是Collection的情形.
*/
@SuppressWarnings("unchecked")
public String toXml(Collection root, String rootName, 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(encoding).marshal(wrapperElement, writer);


return writer.toString();
} catch (JAXBException e) {
throw new RuntimeException(e);
}
}


/**
* Xml->Java Object.
*/
@SuppressWarnings("unchecked")
public <T> T fromXml(String xml) {
try {
StringReader reader = new StringReader(xml);
return (T) createUnmarshaller().unmarshal(reader);
} catch (JAXBException e) {
throw new RuntimeException(e);
}
}


/**
* Xml->Java Object, 支持大小写敏感或不敏感.
*/
@SuppressWarnings("unchecked")
public <T> T fromXml(String xml, boolean caseSensitive) {
try {
String fromXml = xml;
if (!caseSensitive)
fromXml = xml.toLowerCase();
StringReader reader = new StringReader(fromXml);
return (T) createUnmarshaller().unmarshal(reader);
} catch (JAXBException e) {
throw new RuntimeException(e);
}
}


/**
* 创建Marshaller, 设定encoding(可为Null).
*/
public Marshaller createMarshaller(String encoding) {
try {
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 new RuntimeException(e);
}
}


/**
* 创建UnMarshaller.
*/
public Unmarshaller createUnmarshaller() {
try {
return jaxbContext.createUnmarshaller();
} catch (JAXBException e) {
throw new RuntimeException(e);
}
}


/**
* 封装Root Element 是 Collection的情况.
*/
public static class CollectionWrapper {
@SuppressWarnings("unchecked")
@XmlAnyElement
protected Collection collection;
}




}