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@@ -5,6 +5,8 @@ import java.io.InputStream; |
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import java.io.StringReader; |
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import java.io.StringWriter; |
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import java.io.Writer; |
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import java.util.HashMap; |
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import java.util.Map; |
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import javax.xml.bind.JAXBContext; |
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import javax.xml.bind.JAXBException; |
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@@ -24,15 +26,17 @@ public class XmlTransformer { |
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* @return |
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* @throws JAXBException |
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*/ |
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@SuppressWarnings("unchecked") |
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public static <T> T fromXml(Class<T> clazz, String xml) throws JAXBException { |
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JAXBContext context = JAXBContext.newInstance(clazz); |
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JAXBContext context = getJAXBContext(clazz); |
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Unmarshaller um = context.createUnmarshaller(); |
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T object = (T) um.unmarshal(new StringReader(xml)); |
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return object; |
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} |
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@SuppressWarnings("unchecked") |
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public static <T> T fromXml(Class<T> clazz, InputStream is) throws JAXBException { |
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JAXBContext context = JAXBContext.newInstance(clazz); |
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JAXBContext context = getJAXBContext(clazz); |
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Unmarshaller um = context.createUnmarshaller(); |
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InputSource inputSource = new InputSource(is); |
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inputSource.setEncoding("utf-8"); |
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@@ -53,7 +57,7 @@ public class XmlTransformer { |
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} |
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public static <T> void toXml(Class<T> clazz, T object, Writer writer) throws JAXBException { |
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JAXBContext context = JAXBContext.newInstance(clazz); |
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JAXBContext context = getJAXBContext(clazz); |
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Marshaller m = context.createMarshaller(); |
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m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); |
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m.setProperty(CharacterEscapeHandler.class.getName(), characterUnescapeHandler); |
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@@ -68,4 +72,20 @@ public class XmlTransformer { |
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} |
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} |
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protected static Map<Class<?>, JAXBContext> jaxbContexts = new HashMap<Class<?>, JAXBContext>(); |
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protected static JAXBContext getJAXBContext(Class<?> clazz){ |
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//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. |
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JAXBContext context = jaxbContexts.get(clazz); |
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if(context == null){ |
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try { |
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context = JAXBContext.newInstance(clazz); |
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} catch (JAXBException e) { |
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throw new RuntimeException("创建JAXBContext实例失败:" + clazz.getName(), e); |
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} |
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jaxbContexts.put(clazz, context); |
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} |
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return context; |
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} |
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} |