java 如何提供xml接口

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java 如何提供xml接口0

有一个需求，web 必须提供xml的结果（接口），大家都是怎么做的？是写好xml文件，然后替换xml的结果吗？
或者是拼凑xml然后输出？这个好像很不专业。

XML

2013年9月02日 23:18

xchd
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5个答案按时间排序按投票排序

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采纳的答案

直接有对bean2xml的工具

package com.fand.context.mapper;

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.lang.StringUtils;
import org.springframework.http.converter.HttpMessageConversionException;
import org.springframework.util.Assert;

import com.google.common.base.Throwables;

/**
 * 使用Jaxb2.0实现XML<->Java Object的Mapper. 在创建时需要设定所有需要序列化的Root对象的Class.
 * 特别支持Root对象是Collection的情形.
 * 
 * @author yaoHT
 */
public class JaxbMapper {

	/**
	 * 封装Root Element 是 Collection的情况.
	 */
	public static class CollectionWrapper {

		@XmlAnyElement
		private Collection<?> collection;
	}

	private static ConcurrentMap<Class<?>, JAXBContext> jaxbContexts = new ConcurrentHashMap<Class<?>, JAXBContext>();

	/**
	 * 创建Marshaller并设定encoding(可为null). 线程不安全，需要每次创建或pooling。
	 */
	public static Marshaller createMarshaller(final Class<?> clazz, final String encoding) {
		try {
			final JAXBContext jaxbContext = JaxbMapper.getJaxbContext(clazz);

			final 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 (final JAXBException e) {
			throw new RuntimeException(Throwables.getStackTraceAsString(e));
		}
	}

	/**
	 * 创建UnMarshaller. 线程不安全，需要每次创建或pooling。
	 */
	public static Unmarshaller createUnmarshaller(final Class<?> clazz) {
		try {
			final JAXBContext jaxbContext = JaxbMapper.getJaxbContext(clazz);

			return jaxbContext.createUnmarshaller();
		} catch (final JAXBException e) {
			throw new RuntimeException(Throwables.getStackTraceAsString(e));
		}
	}

	/**
	 * Xml->Java Object.
	 */
	@SuppressWarnings("unchecked")
	public static <T> T fromXml(final String xml, final Class<T> clazz) {
		try {
			final StringReader reader = new StringReader(xml);

			return (T) JaxbMapper.createUnmarshaller(clazz).unmarshal(reader);
		} catch (final JAXBException e) {
			throw new RuntimeException(Throwables.getStackTraceAsString(e));
		}
	}

	private static JAXBContext getJaxbContext(final Class<?> clazz) {
		Assert.notNull(clazz, "'clazz' must not be null");
		JAXBContext jaxbContext = JaxbMapper.jaxbContexts.get(clazz);
		if (jaxbContext == null) {
			try {
				jaxbContext = JAXBContext.newInstance(clazz, CollectionWrapper.class);

				JaxbMapper.jaxbContexts.putIfAbsent(clazz, jaxbContext);
			} catch (final JAXBException ex) {
				throw new HttpMessageConversionException("Could not instantiate JAXBContext for class [" + clazz
						+ "]: " + ex.getMessage(), ex);
			}
		}
		return jaxbContext;
	}

	/**
	 * Java Collection->Xml without encoding, 特别支持Root Element是Collection的情形.
	 */
	public static String toXml(final Collection<?> root, final String rootName, final Class<?> clazz) {
		return JaxbMapper.toXml(root, rootName, clazz, null);
	}

	/**
	 * Java Collection->Xml with encoding, 特别支持Root Element是Collection的情形.
	 */
	public static String toXml(final Collection<?> root, final String rootName, final Class<?> clazz,
			final String encoding) {
		try {
			final CollectionWrapper wrapper = new CollectionWrapper();

			wrapper.collection = root;

			final JAXBElement<CollectionWrapper> wrapperElement = new JAXBElement<CollectionWrapper>(new QName(
					rootName), CollectionWrapper.class, wrapper);

			final StringWriter writer = new StringWriter();

			JaxbMapper.createMarshaller(clazz, encoding).marshal(wrapperElement, writer);

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

	/**
	 * Java Object->Xml without encoding.
	 */
	public static String toXml(final Object root) {
		final Class<?> clazz = root.getClass();

		return JaxbMapper.toXml(root, clazz, null);
	}

	/**
	 * Java Object->Xml with encoding.
	 */
	public static String toXml(final Object root, final Class<?> clazz, final String encoding) {
		try {
			final StringWriter writer = new StringWriter();

			JaxbMapper.createMarshaller(clazz, encoding).marshal(root, writer);

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

	/**
	 * Java Object->Xml with encoding.
	 */
	public static String toXml(final Object root, final String encoding) {
		final Class<?> clazz = root.getClass();

		return JaxbMapper.toXml(root, clazz, encoding);
	}
}

2013年9月03日 05:47

addday
30
0 0 4