com.foxinmy.weixin4j.xml.XmlStream Maven / Gradle / Ivy
package com.foxinmy.weixin4j.xml;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.StringReader;
import java.io.StringWriter;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentHashMap;
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.XmlRootElement;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamSource;
import com.alibaba.fastjson.JSONObject;
import com.foxinmy.weixin4j.util.Consts;
import com.foxinmy.weixin4j.util.StringUtil;
/**
* XML 处理
*
* @className XmlStream
* @author jinyu([email protected])
* @date 2015年6月2日
* @since JDK 1.6
* @see
*/
public final class XmlStream {
private final static String ROOT_ELEMENT_XML = "xml";
private final static String XML_VERSION = "1.0";
private final static ConcurrentHashMap, JAXBContext> jaxbContexts = new ConcurrentHashMap, JAXBContext>();
/**
* Xml2Bean
*
* @param content
* xml内容
* @param clazz
* bean类型
* @return
*/
@SuppressWarnings("unchecked")
public static T fromXML(InputStream content, Class clazz) {
JAXBContext jaxbContext = getJaxbContext(clazz);
try {
Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
Source source = new StreamSource(content);
XmlRootElement rootElement = clazz
.getAnnotation(XmlRootElement.class);
if (rootElement == null
|| rootElement.name().equals(
XmlRootElement.class.getMethod("name")
.getDefaultValue().toString())) {
JAXBElement jaxbElement = unmarshaller.unmarshal(source,
clazz);
return jaxbElement.getValue();
} else {
return (T) unmarshaller.unmarshal(source);
}
} catch (JAXBException ex) {
throw new RuntimeException("Could not unmarshaller class [" + clazz
+ "]: " + ex.getMessage(), ex);
} catch (NoSuchMethodException ex) {
throw new RuntimeException("Could not unmarshaller class [" + clazz
+ "]: " + ex.getMessage(), ex);
} finally {
if (content != null) {
try {
content.close();
} catch (IOException e) {
;
}
}
}
}
/**
* Xml2Bean
*
* @param content
* xml内容
* @param clazz
* bean类型
* @return
*/
public static T fromXML(String content, Class clazz) {
return fromXML(
new ByteArrayInputStream(content.getBytes(Consts.UTF_8)), clazz);
}
/**
* map2xml
*
* @param map
* value无嵌套的map
* @return xml内容
*/
public static String map2xml(Map map) {
StringWriter sw = new StringWriter();
try {
XMLStreamWriter xw = XMLOutputFactory.newInstance()
.createXMLStreamWriter(sw);
xw.writeStartDocument(Consts.UTF_8.name(), XML_VERSION);
xw.writeStartElement(ROOT_ELEMENT_XML);
for (Entry entry : map.entrySet()) {
if (StringUtil.isBlank(entry.getValue())) {
continue;
}
xw.writeStartElement(entry.getKey());
xw.writeCData(entry.getValue());
xw.writeEndElement();
}
xw.writeEndDocument();
xw.flush();
xw.close();
} catch (XMLStreamException e) {
throw new IllegalArgumentException(e);
} finally {
try {
sw.close();
} catch (IOException e) {
;
}
}
return sw.getBuffer().toString();
}
/**
* map2xml
*
* @param json
* value无嵌套的json
* @return xml内容
*/
public static String map2xml(JSONObject json) {
StringWriter sw = new StringWriter();
try {
XMLStreamWriter xw = XMLOutputFactory.newInstance()
.createXMLStreamWriter(sw);
xw.writeStartDocument(Consts.UTF_8.name(), XML_VERSION);
xw.writeStartElement(ROOT_ELEMENT_XML);
for (Entry entry : json.entrySet()) {
if (StringUtil.isBlank(json.getString(entry.getKey()))) {
continue;
}
xw.writeStartElement(entry.getKey());
xw.writeCData(json.getString(entry.getKey()));
xw.writeEndElement();
}
xw.writeEndDocument();
xw.flush();
xw.close();
} catch (XMLStreamException e) {
throw new IllegalArgumentException(e);
} finally {
try {
sw.close();
} catch (IOException e) {
;
}
}
return sw.getBuffer().toString();
}
/**
* xml2map
*
* @param content
* 无嵌套节点的xml内容
* @return map对象
*/
public static Map xml2map(String content) {
Map map = new HashMap();
StringReader sr = new StringReader(content);
try {
XMLStreamReader xr = XMLInputFactory.newInstance()
.createXMLStreamReader(sr);
while (true) {
int event = xr.next();
if (event == XMLStreamConstants.END_DOCUMENT) {
xr.close();
break;
} else if (event == XMLStreamConstants.START_ELEMENT) {
String name = xr.getLocalName();
while (true) {
event = xr.next();
if (event == XMLStreamConstants.START_ELEMENT) {
name = xr.getLocalName();
} else if (event == XMLStreamConstants.END_ELEMENT) {
break;
} else if (event == XMLStreamConstants.CHARACTERS) {
String value = xr.getText();
map.put(name, value);
}
}
}
}
} catch (XMLStreamException e) {
throw new IllegalArgumentException(e);
} finally {
sr.close();
}
return map;
}
/**
* Bean2Xml
*
* @param object
* bean对象
* @return xml内容
*/
public static String toXML(Object object) {
ByteArrayOutputStream os = new ByteArrayOutputStream();
toXML(object, os);
return StringUtil.newStringUtf8(os.toByteArray());
}
/**
* Bean2Xml
*
* @param t
* bean对象
* @param os
* 输出流
*/
@SuppressWarnings("unchecked")
public static void toXML(T t, OutputStream os) {
Class clazz = (Class) t.getClass();
JAXBContext jaxbContext = getJaxbContext(clazz);
try {
Marshaller marshaller = jaxbContext.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_ENCODING,
Consts.UTF_8.name());
XmlRootElement rootElement = clazz
.getAnnotation(XmlRootElement.class);
if (rootElement == null
|| rootElement.name().equals(
XmlRootElement.class.getMethod("name")
.getDefaultValue().toString())) {
marshaller.marshal(new JAXBElement(new QName(
ROOT_ELEMENT_XML), clazz, t), os);
} else {
marshaller.marshal(t, os);
}
} catch (JAXBException ex) {
throw new RuntimeException("Could not marshal class [" + clazz
+ "]: " + ex.getMessage(), ex);
} catch (NoSuchMethodException ex) {
throw new RuntimeException("Could not marshaller class [" + clazz
+ "]: " + ex.getMessage(), ex);
} finally {
if (os != null) {
try {
os.close();
} catch (IOException e) {
;
}
}
}
}
private static JAXBContext getJaxbContext(Class clazz) {
JAXBContext jaxbContext = jaxbContexts.get(clazz);
if (jaxbContext == null) {
try {
jaxbContext = JAXBContext.newInstance(clazz);
jaxbContexts.putIfAbsent(clazz, jaxbContext);
} catch (JAXBException ex) {
throw new RuntimeException(
"Could not instantiate JAXBContext for class [" + clazz
+ "]: " + ex.getMessage(), ex);
}
}
return jaxbContext;
}
}
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