webserver.java

Java写的含有一个jdbc驱动的小型数据库数据库引擎

/*
 * WebServer.java
 *
 * Copyright (c) 2001, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This package is based on HypersonicSQL, originally developed by Thomas Mueller.
 *
 */
package org.hsqldb;

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

/**
 * <font color="#009900">
 * WebServer acts as a HTTP server and is one way of using
 * the client / server mode of HSQL Database Engine. This server
 * can deliver static files and can also process database queries.
 * An applet will need only the JDBC classes to access the database.
 *
 * The WebServer can be configured with the file 'WebServer.properties'.
 * This is an example of the file:
 * <pre>
 * port=80
 * database=test
 * root=./
 * default=index.html
 * silent=true
 *
 * .htm=text/html
 * .html=text/html
 * .txt=text/plain
 * .gif=image/gif
 * .class=application/octet-stream
 * .jpg=image/jpeg
 * .jgep=image/jpeg
 * .zip=application/x-zip-compressed</pre>
 * Root: use / as separator even for DOS/Windows, it will be replaced<BR>
 * Mime-types: file ending must be lowercase<BR>
 * </font>
 */
public class WebServer {
    static final String mServerName = "HypersonicSQL/1.0";
    String		mRoot;
    String		mDefaultFile;
    char		mPathSeparatorChar;
    boolean		mSilent;
    Database		mDatabase;
    Properties		mProperties;

    /**
     * Method declaration
     *
     *
     * @param arg
     */
    public static void main(String arg[]) {
	WebServer w = new WebServer();

	w.run(arg);
    }

    /**
     * Method declaration
     *
     *
     * @param arg
     */
    private void run(String arg[]) {
	ServerSocket socket = null;

	try {
	    Properties prop = new Properties();

	    mProperties = prop;

	    // load parameters from properties file
	    File f = new File("WebServer.properties");

	    if (f.exists()) {
		FileInputStream fi = new FileInputStream(f);

		prop.load(fi);
		fi.close();
	    }

	    // overwrite parameters with command line parameters
	    for (int i = 0; i < arg.length; i++) {
		String p = arg[i];

		if (p.equals("-?")) {
		    printHelp();
		}

		if (p.charAt(0) == '-') {
		    prop.put(p.substring(1), arg[i + 1]);

		    i++;
		}
	    }

	    int    port = Integer.parseInt(prop.getProperty("port", "80"));
	    String database = prop.getProperty("database", "test");

	    mRoot = prop.getProperty("root", "./");
	    mDefaultFile = prop.getProperty("default", "index.html");
	    mSilent = prop.getProperty("silent",
				       "true").equalsIgnoreCase("true");

	    if (prop.getProperty("trace", "false").equalsIgnoreCase("true")) {
		DriverManager.setLogStream(System.out);
	    }

	    socket = new ServerSocket(port);
	    mPathSeparatorChar = File.separatorChar;

	    trace("port    =" + port);
	    trace("database=" + database);
	    trace("root    =" + mRoot);
	    trace("default =" + mDefaultFile);
	    trace("silent  =" + mSilent);

	    mDatabase = new Database(database);

	    System.out.println("WebServer " + jdbcDriver.VERSION
			       + " is running");
	    System.out.println("Press [Ctrl]+[C] to abort");
	} catch (Exception e) {
	    traceError("WebServer.run/init: " + e);

	    return;
	}

	try {
	    while (true) {
		Socket		    s = socket.accept();
		WebServerConnection c = new WebServerConnection(s, this);

		c.start();
	    }
	} catch (IOException e) {
	    traceError("WebServer.run/loop: " + e.getMessage());
	}
    }

    /**
     * Method declaration
     *
     */
    void printHelp() {
	System.out.println("Usage: java WebServer [-options]\n"
			   + "where options include:\n"
			   + "    -port <nr>            port where the server is listening\n"
			   + "    -database <name>      name of the database\n"
			   + "    -root <path>          root path for sending files\n"
			   + "    -default <file>       default file when filename is missing\n"
			   + "    -silent <true/false>  false means display all queries\n"
			   + "    -trace <true/false>   display print JDBC trace messages\n"
			   + "The command line arguments override the values in the properties file.");
	System.exit(0);
    }

    /**
     * Method declaration
     *
     *
     * @param s
     */
    void trace(String s) {
	if (!mSilent) {
	    System.out.println(s);
	}
    }

    /**
     * Method declaration
     *
     *
     * @param s
     */
    void traceError(String s) {
	System.out.println(s);
    }

}