使用高性能xml序列化框架jibx作为spring mvc的xml view

package org.springframework.web.servlet.view.xml;

import java.io.ByteArrayOutputStream;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.transform.stream.StreamResult;

import org.springframework.beans.BeansException;
import org.springframework.oxm.Marshaller;
import org.springframework.util.Assert;
import org.springframework.util.FileCopyUtils;
import org.springframework.web.servlet.view.AbstractView;

public class XmlMarshallerView extends AbstractView {

    /**
     * Default content type. Overridable as bean property.
     */
    public static final String DEFAULT_CONTENT_TYPE = "application/xml";

    private Marshaller marshaller;
    
    private JibxMarshallerFactory jibxMarshallerFactory;
    
    private String modelKey;

    /**
     * Constructs a new {@code MarshallingView} with no {@link Marshaller} set. The marshaller must be set after
     * construction by invoking {@link #setMarshaller(Marshaller)}.
     */
    public XmlMarshallerView() {
        setContentType(DEFAULT_CONTENT_TYPE);
        setExposePathVariables(false);
    }

    /**
     * Constructs a new {@code MarshallingView} with the given {@link Marshaller} set.
     */
    public XmlMarshallerView(Marshaller marshaller) {
        Assert.notNull(marshaller, "'marshaller' must not be null");
        setContentType(DEFAULT_CONTENT_TYPE);
        this.marshaller = marshaller;
        setExposePathVariables(false);
    }

    public void setJibxMarshallerFactory(JibxMarshallerFactory jibxMarshallerFactory) {
        this.jibxMarshallerFactory = jibxMarshallerFactory;
    }

    /**
     * Sets the {@link Marshaller} to be used by this view.
     */
    public void setMarshaller(Marshaller marshaller) {
        Assert.notNull(marshaller, "'marshaller' must not be null");
        this.marshaller = marshaller;
    }

    /**
     * Set the name of the model key that represents the object to be marshalled. If not specified, the model map will be
     * searched for a supported value type.
     *
     * @see Marshaller#supports(Class)
     */
    public void setModelKey(String modelKey) {
        this.modelKey = modelKey;
    }

    @Override
    protected void initApplicationContext() throws BeansException {
        if (marshaller == null && jibxMarshallerFactory == null) {
            throw new RuntimeException("Property 'marshaller' or 'jibxMarshallerFactory', at least one is required");
        }
    }

    @Override
    protected void renderMergedOutputModel(Map<String, Object> model,
                                           HttpServletRequest request,
                                           HttpServletResponse response) throws Exception {
        Object toBeMarshalled = locateToBeMarshalled(model);
        
        if (toBeMarshalled == null) {
            throw new ServletException("Unable to locate object to be marshalled in model: " + model);
        }
        ByteArrayOutputStream bos = new ByteArrayOutputStream(2048);
        marshaller.marshal(toBeMarshalled, new StreamResult(bos));

        setResponseContentType(request, response);
        response.setContentLength(bos.size());

        FileCopyUtils.copy(bos.toByteArray(), response.getOutputStream());
    }

    /**
     * Locates the object to be marshalled. The default implementation first attempts to look under the configured
     * {@linkplain #setModelKey(String) model key}, if any, before attempting to locate an object of {@linkplain
     * Marshaller#supports(Class) supported type}.
     *
     * @param model the model Map
     * @return the Object to be marshalled (or {@code null} if none found)
     * @throws ServletException if the model object specified by the {@linkplain #setModelKey(String) model key} is not
     *                          supported by the marshaller
     * @see #setModelKey(String)
     */
    protected Object locateToBeMarshalled(Map<String, Object> model) throws ServletException {
        if (this.modelKey != null) {
            Object o = model.get(this.modelKey);
            if (o == null) {
                throw new ServletException("Model contains no object with key [" + modelKey + "]");
            }
            checkMarshaller(o);
            if (!this.marshaller.supports(o.getClass())) {
                throw new ServletException("Model object [" + o + "] retrieved via key [" + modelKey +
                        "] is not supported by the Marshaller");
            }
            return o;
        }
        for (Object o : model.values()) {
            if (o != null) {
                checkMarshaller(o);
                if (this.marshaller.supports(o.getClass())) {
                    return o;
                }
            }
        }
        return null;
    }
    
    /**
     * check the marshaller is null or not
     * @param object if the marshaller is null, will query from jibxMarshallerFactory by object
     */
    protected void checkMarshaller(Object object) {
        if (marshaller == null) {
            marshaller = jibxMarshallerFactory.getJibxMarshaller(object.getClass());
        }
    }
    

}

这个类参考了spring mvc的MarshallingView。不同就是引入了JibxMarshallerFactory。因为jibx 要对每个要序列化的类进行字节码增强。如果使用xstream等xml框架则不需要使用这个类。当然使用也是可以的。可以直接使用MarshallingView。

package com.vteba.service.xml.jibx;import java.util.HashMap;import java.util.List;import java.util.Map;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.factory.InitializingBean;import org.springframework.oxm.jibx.JibxMarshaller;/**
 * JibxMarshaller Factory。
 * @author yinlei
 * date 2013-8-1 下午8:10:45
 */publicclassJibxMarshallerFactoryimplementsInitializingBean{
        privatestaticLogger logger =LoggerFactory.getLogger(JibxMarshallerFactory.class);
        privatestaticfinalString BINDING_NAME ="Binding";

        privateList<Class<?>> targetClassList;
        privateMap<Class<?>,JibxMarshaller> jibxCache =newHashMap<Class<?>,JibxMarshaller>();

        @Override
        publicvoid afterPropertiesSet()throwsException{
                if(targetClassList !=null){
                        for(Class<?> clazz : targetClassList){
                                JibxMarshaller jibxMarshaller =newJibxMarshaller();
                                jibxMarshaller.setTargetClass(clazz);
                                jibxMarshaller.setBindingName(BINDING_NAME);
                                jibxMarshaller.afterPropertiesSet();
                                jibxCache.put(clazz, jibxMarshaller);
                        }
                }else{
                        if(logger.isInfoEnabled()){
                                logger.info("JiBX映射目标类没有设置。运行时将无法获得JibxMarshaller实例。");
                        }
                }
        }

        publicList<Class<?>> getTargetClassList(){
                return targetClassList;
        }

        publicvoid setTargetClassList(List<Class<?>> targetClassList){
                this.targetClassList = targetClassList;
        }

        publicJibxMarshaller getJibxMarshaller(Class<?> targetClass){
                return jibxCache.get(targetClass);
        }}

因为jibx对所有需要序列化的JavaBean都要事先注册，所以你要事先配置JibxMarshallerFactory，将所有要序列化的类都配置进去。

例如：

<beanid="jibxMarshallerFactory"class="com.vteba.service.xml.jibx.JibxMarshallerFactory">
                <propertyname="targetClassList">
                        <list>
                                <value>com.vteba.service.xml.jibx.Customer</value>
                        </list>
                </property>
        </bean>

绝对原创，转载请注明出处。