flickrps.java

OO 图书馆系统

import java.net.URL;
import org.w3c.dom.*;
//one sample application using flickr.photos.search method to perform a simple key word search 
public class FlickrPS{
	String api_key;
	//1---REST
	//2---SOAP
	Integer requestformat=1;
	String method="flickr.photos.search";
	String tag;
	String para="tags";
	Integer no_display;
	URL url;
	Document doc;

	public FlickrPS (String api_key, Integer requestformat,String tag,Integer no_display){

		this.api_key = api_key;
		this.requestformat=requestformat;
		this.tag=tag;
		this.no_display = no_display;
		
	
	}

	// simulated client
	public static void main(String args[]){
		
		// set the firewall proxy to pass the SIT firewall 
		// comment out the following three lines if you are using the program at home
	    System.setProperty("proxySet", "true");
		System.setProperty("http.proxyHost", "www-cache.cs.usyd.edu.au");
		System.setProperty("http.proxyPort","8000"); 
		
		FlickrPS flickrps=new FlickrPS("8447cdc43d7b3e85c7d01f5d9875ecb9",Integer.parseInt(args[0]),args[1],Integer.parseInt(args[2]));
		flickrps.searchByTag();
	}

	/**
	 * Assumming only one tag is used to search
	 * 
	 */
	public void searchByTag(){
        try {
        	//REST request
            if(requestformat==1){
            
              //using factory MessageFactory to create URL for REST request	
			  this.url = new URL(MessageFactory.getRESTUrl(method,para,tag,api_key));
	          //using strategy to set communiction between client and server
	          //then get the response from server
              CommFormat commformat = new CommFormat(new ConcreteStrategyREST(url));
              this.doc=commformat.getResponse();
              System.out.println("Getting Response from server successfully with REST!");
            
            }
            
            else if(requestformat==2){
              this.url=new URL("http://api.flickr.com/services/soap/");
              //using factory MessageFactory to create SOAPEnvelope for SOAP request	
              CommFormat commformat = new CommFormat(new ConcreteStrategySOAP(url,MessageFactory.getSOAP(method,para,tag,api_key)));
              this.doc=commformat.getResponse();
              System.out.println("Getting Response from server successfully with SOAP!");
            	
            }
            else{
            	
            System.out.println("Invalid RequestFormat name!"+requestformat);
            	
            return;
            }
           
            //since when i use concretestrategy to get the response from server, for REST  and SOAP,
            //the response has been converted to Document formate,then i can using the same parsing method for both
            //request format 
            
            //but because the two different method flickr.photos.search and flickr.tags.getrelated give the two different
            //response in Document formate,so i am using the facade pattern for different method
            //"PhotoPS"-----means using flickr.photos.search
            //"PhotoTR"-----means using flickr.tags.getrelated 
            ParsingFacade facade = new ParsingFacade(doc,"PhotoPS");
            
            //parsing response Document, then display it
            facade.parsingPS(no_display);
                    
        } catch (Exception e) {
            e.printStackTrace();
        }
	}
		
	
}