buffaloserviceexporter.java

AJAX的一个好东西哦,国人的一个AJAX的实现不错的东西

/*
 * Copyright 2002-2004 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */ 

package net.buffalo.spring;
import java.io.IOException;
import java.util.Iterator;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.buffalo.server.Buffalo;
import net.buffalo.server.BuffaloService;

import org.springframework.beans.factory.InitializingBean;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
import org.springframework.web.servlet.support.WebContentGenerator;

import com.caucho.burlap.io.BurlapInput;
import com.caucho.burlap.io.BurlapOutput;
import com.caucho.burlap.server.BurlapSkeleton;

/**
 * This is a wrap for the buffalo service.
 * The changes is for javascript client use, since the old serialized xml
 * string is not a valid xml content. 
 * 
 * @deprecated
 * @author michael
 * @since 1.1
 */
public class BuffaloServiceExporter implements Controller, InitializingBean {

	private Map services;
	
    /**
     * @return Returns the services.
     */
    public Map getServices() {
        return services;
    }
    /**
     * @param services The services to set.
     */
    public void setServices(Map services) {
        this.services = services;
    }
    
	public void afterPropertiesSet() throws Exception {
	    String key;
        Object value;
        for(Iterator it = services.keySet().iterator(); it.hasNext();) {
            
            key = (String)it.next();
            value = services.get(key);

            services.put(key, value);
        }
	}

	/**
	 * Process the incoming buffalo request and create a Buffalo response.
	 */
	public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
		if (!WebContentGenerator.METHOD_POST.equals(request.getMethod())) {
			throw new ServletException("BuffaloServiceExporter only supports POST requests");
		}
		
		String serviceName = request.getParameter(Buffalo.SERVICE_NAME_ID);
		Object service = services.get(serviceName);
		if (service == null) throw new IllegalArgumentException("Service cannot be null!");
		
		if (service instanceof BuffaloService) {
		    ((BuffaloService) service).init(request.getSession().getServletContext(), request);
		}
		
		BurlapSkeleton skeleton = new BurlapSkeleton(service);
		
		BurlapInput in = new BurlapInput(request.getInputStream());
		BurlapOutput out = new BurlapOutput(response.getOutputStream()) {
			public void startReply() throws IOException {
				print("<?xml version=\"1.0\" encoding=\"utf-8\"?><burlap:reply xmlns:burlap=\"http://www.buffalo.net/burlap/\">");
			}
		};
		try {
		  skeleton.invoke(in, out);
			return null;
		} catch (Exception ex) {
			throw ex;
		} catch (Error ex) {
			throw ex;
		} catch (Throwable ex) {
			// Should never happen: There are no Throwables other than Exceptions and Errors.
		  throw new ServletException(ex);
		}
	}

}