urlfilereader.java

著名IT公司ILog的APS高级排产优化引擎

package com.power.util.urltools;

import java.util.*;
import java.io.*;
import java.net.*;

import com.power.pipeengine.Variable.*;
import com.power.pipeengine.Constraint.*;
import com.power.pipe.*;
import com.power.pipeengine.*;
import com.power.util.Message.*;
import com.power.lpsolver.LPSolve.*;

public class URLFileReader
{
    private static final URLFileReader INSTANCE =
                              new URLFileReader();

   // Private constructor supresses
   // default public constructor
    private URLFileReader( ) {
    }

    public static URLFileReader getInstance( ) {
        return INSTANCE;
    }

    private HttpURLConnection urlconn = null;
    private String urlAddr = null;

    public BufferedReader getReaderForURL( String addr,
                                           String cmd,
                                           String fileName  )
    throws Exception
    {
		urlAddr = addr;
		URL url = new URL ( urlAddr + "?cmd=" + cmd + "&FileName=" +
                            fileName );

		BufferedReader d = null;
		InputStream in = null;

		try {
			urlconn = (HttpURLConnection)(url.openConnection());
			urlconn.setRequestMethod("GET");
			in = urlconn.getInputStream();
			d = new BufferedReader(new InputStreamReader(in) );
		}
		catch(Exception e) {
			MessageArea.getInstance().addMessage( "Error openning URL: " +
                            urlAddr + "for file: " + fileName + "\n" );
			return null;
		}

        return d;
    }


	public void closeURLConnection() {
        if( urlconn != null ) {
            urlconn.disconnect();
        }
	}

	protected void publishFileReadingMsg() {
		MessageArea.getInstance().addMessage(
                "Reading file: model.out\n" );

	}


}