java物件與XML互轉
1. 定義XML對應的java實體類(可巢狀)
import java.io.Serializable;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement(name="INFO") //設定生成的xml的根節點的名稱
@XmlAccessorType(XmlAccessType.FIELD) //設定根據欄位還是方法生成
public class InfoIN implements Serializable{
/**
*
*/
private static final long serialVersionUID = -7060974820353568568L;
//函式名
@XmlElement(name="FUNNAM")
private String FUNNAM;
//資料格式
@XmlElement(name="DATTYP")
private int DATTYP;
//登陸使用者名稱
@XmlElement(name="LGNNAM")
private String LGNNAM;
public String getFUNNAM() {
return FUNNAM;
}
public void setFUNNAM(String fUNNAM) {
FUNNAM = fUNNAM;
}
public int getDATTYP() {
return DATTYP;
}
public void setDATTYP(int dATTYP) {
DATTYP = dATTYP;
}
public String getLGNNAM() {
return LGNNAM;
}
public void setLGNNAM(String lGNNAM) {
LGNNAM = lGNNAM;
}
}
2. 呼叫定義好的轉換工具類
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.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.Validate;
/**
* XML 物件互轉工具類
* 使用Jaxb2.0實現XML<->Java Object的Mapper.
* 在建立時需要設定所有需要序列化的Root物件的Class.
* 特別支援Root物件是Collection的情形.
*/
public class JaxbUtil {
@SuppressWarnings("rawtypes")
private static ConcurrentMap<Class, JAXBContext> jaxbContexts = new ConcurrentHashMap<Class, JAXBContext>();
/**
* Java Object->Xml without encoding.
*/
@SuppressWarnings("rawtypes")
public static String toXml(Object root) {
Class clazz = root.getClass();
return toXml(root, clazz, null);
}
/**
* Java Object->Xml with encoding.
*/
@SuppressWarnings("rawtypes")
public static String toXml(Object root, String encoding) {
Class clazz = root.getClass();
return toXml(root, clazz, encoding);
}
/**
* Java Object->Xml with encoding.
*/
@SuppressWarnings("rawtypes")
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) {
e.printStackTrace();
return null;
}
}
/**
* Java Collection->Xml without encoding, 特別支援Root Element是Collection的情形.
*/
@SuppressWarnings("rawtypes")
public static String toXml(Collection<?> root, String rootName, Class clazz) {
return toXml(root, rootName, clazz, null);
}
/**
* Java Collection->Xml with encoding, 特別支援Root Element是Collection的情形.
*/
@SuppressWarnings("rawtypes")
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) {
e.printStackTrace();
return null;
}
}
/**
* 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) {
e.printStackTrace();
return null;
}
}
/**
* 建立Marshaller並設定encoding(可為null).
* 執行緒不安全,需要每次建立或pooling。
*/
@SuppressWarnings("rawtypes")
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) {
e.printStackTrace();
return null;
}
}
/**
* 建立UnMarshaller.
* 執行緒不安全,需要每次建立或pooling。
*/
@SuppressWarnings("rawtypes")
public static Unmarshaller createUnmarshaller(Class clazz) {
try {
JAXBContext jaxbContext = getJaxbContext(clazz);
return jaxbContext.createUnmarshaller();
} catch (JAXBException e) {
e.printStackTrace();
return null;
}
}
@SuppressWarnings("rawtypes")
protected static JAXBContext getJaxbContext(Class clazz) {
Validate.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 RuntimeException("Could not instantiate JAXBContext for class [" + clazz + "]: "
+ ex.getMessage(), ex);
}
}
return jaxbContext;
}
/**
* 封裝Root Element 是 Collection的情況.
*/
public static class CollectionWrapper {
@XmlAnyElement
protected Collection<?> collection;
}
}