filelistener.java

openmap java写的开源数字地图程序. 用applet实现,可以像google map 那样放大缩小地图.

// **********************************************************************
// 
// <copyright>
// 
//  BBN Technologies
//  10 Moulton Street
//  Cambridge, MA 02138
//  [phone]
// 
//  Copyright (C) BBNT Solutions LLC. All rights reserved.
// 
// </copyright>
// **********************************************************************
// 
// $Source: /cvs/distapps/openmap/src/openmap/com/bbn/openmap/layer/util/http/FileListener.java,v $
// $RCSfile: FileListener.java,v $
// $Revision: 1.2.2.1 $
// $Date: 2004/10/14 18:27:19 $
// $Author: dietrick $
// 
// **********************************************************************

package com.bbn.openmap.layer.util.http;

import java.io.*;

import com.bbn.openmap.util.Debug;

/**
 * An HttpRequestListener that sends a file back.
 * 
 * @author Tom Mitchell
 * @version 1.0, 06/13/97
 */
public class FileListener implements HttpRequestListener {

    public FileListener() {}

    /**
     * Reverse the input and send it back to the client.
     */
    public void httpRequest(HttpRequestEvent e) throws IOException {
        String filename = e.getRequest().substring(1);
        if (Debug.debugging("http")) {
            Debug.output("FileListener: Looking for file " + filename);
        }

        FileInputStream requestedfile;
        try {
            requestedfile = new FileInputStream(filename);
        } catch (java.io.FileNotFoundException exception) {
            Debug.error("FileListener: Unable to find file " + filename);
            return;
            // Need a return value here
        }

        // Read in the file's bytes. This doesn't seem super efficient
        int bytes = requestedfile.available();
        byte[] b = new byte[bytes];
        int bytes_read = requestedfile.read(b);
        if (bytes_read != bytes) {
            Debug.error("FileListener: Did not read the correct number of bytes for "
                    + filename);
        }
        // and write out the raw bytes
        e.getWriter().write(new String(b));
    }
}