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JAXBContext自身是线程安全的,而该对象创建比较耗时,微信消息序列化反序列化非常频繁,缓存JAXBContext对象提高性能

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This commit is contained in:
haogrgr 2014-10-15 14:07:55 +08:00
parent 3e28f842de
commit 0abadf0929
1 changed files with 23 additions and 3 deletions
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26
src/main/java/me/chanjar/weixin/util/xml/XmlTransformer.java
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@ -5,6 +5,8 @@ import java.io.InputStream;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import java.util.HashMap;
import java.util.Map;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
@ -24,15 +26,17 @@ public class XmlTransformer {
* @return
* @throws JAXBException
*/
@SuppressWarnings("unchecked")
public static <T> T fromXml(Class<T> clazz, String xml) throws JAXBException {
JAXBContext context = JAXBContext.newInstance(clazz);
JAXBContext context = getJAXBContext(clazz);
Unmarshaller um = context.createUnmarshaller();
T object = (T) um.unmarshal(new StringReader(xml));
return object;
}
@SuppressWarnings("unchecked")
public static <T> T fromXml(Class<T> clazz, InputStream is) throws JAXBException {
JAXBContext context = JAXBContext.newInstance(clazz);
JAXBContext context = getJAXBContext(clazz);
Unmarshaller um = context.createUnmarshaller();
InputSource inputSource = new InputSource(is);
inputSource.setEncoding("utf-8");
@ -53,7 +57,7 @@ public class XmlTransformer {
}
public static <T> void toXml(Class<T> clazz, T object, Writer writer) throws JAXBException {
JAXBContext context = JAXBContext.newInstance(clazz);
JAXBContext context = getJAXBContext(clazz);
Marshaller m = context.createMarshaller();
m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
m.setProperty(CharacterEscapeHandler.class.getName(), characterUnescapeHandler);
@ -68,4 +72,20 @@ public class XmlTransformer {
}
}
protected static Map<Class<?>, JAXBContext> jaxbContexts = new HashMap<Class<?>, JAXBContext>();
protected static JAXBContext getJAXBContext(Class<?> clazz){
//JAXBContext是线程安全的,且创建相对比较耗性能,使用map缓存,并发下多次创建没问题.
JAXBContext context = jaxbContexts.get(clazz);
if(context == null){
try {
context = JAXBContext.newInstance(clazz);
} catch (JAXBException e) {
throw new RuntimeException("创建JAXBContext实例失败:" + clazz.getName(), e);
}
jaxbContexts.put(clazz, context);
}
return context;
}
}