webserver.java

一个用java写的开源的数据库系统

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package org.hsqldb;

import java.io.File;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.sql.DriverManager;

/**
 *  WebServer acts as an 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>
 * server.port=80
 * server.database=test
 * server.root=./
 * server.default_page=index.html
 * server.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>
 *
 * @version 1.7.0
 */

// fredt@users 20020215 - patch 1.7.0 by fredt
// method rorganised to use new HsqlServerProperties class
public class WebServer extends Server {

    static final String mServerName = "HSQLDB/1.7.1";
    String              mRoot;
    String              mDefaultFile;
    char                mPathSeparatorChar;

    /**
     *  Method declaration
     *
     * @param  arg
     */
    public static void main(String arg[]) {

        if (arg.length > 0) {
            String p = arg[0];

            if ((p != null) && p.startsWith("-?")) {
                printHelp();

                return;
            }
        }

        WebServer      server = new WebServer();
        HsqlProperties props  = HsqlProperties.argArrayToProps(arg, "server");

        server.setProperties(props);
        server.run();
    }

    void setProperties(HsqlProperties props) {

        serverProperties = new HsqlProperties("webserver");

        try {
            serverProperties.load();
        } catch (Exception e) {
            Trace.printSystemOut(
                "webserver.properties"
                + " not found, using command line or default properties");
        }

        serverProperties.addProperties(props);
        serverProperties.setPropertyIfNotExists("server.database", "test");
        serverProperties.setPropertyIfNotExists("server.port", "80");

        mRoot = serverProperties.setPropertyIfNotExists("server.root", "./");
        mDefaultFile =
            serverProperties.setPropertyIfNotExists("server.default_page",
                "index.html");

        if (serverProperties.isPropertyTrue("server.trace")) {
            jdbcSystem.setLogToSystem(true);
        }

        traceMessages = !serverProperties.isPropertyTrue("server.silent",
                true);
    }

    /**
     *  Method declaration
     *
     */
    private void run() {

        socket = null;

        try {
            int port = serverProperties.getIntegerProperty("server.port", 80);
            String database = serverProperties.getProperty("server.database");

            Trace.printSystemOut("Opening database: " + database);
            printTraceMessages();

            mPathSeparatorChar = File.separatorChar;
            mDatabase          = new Database(database);
            socket             = new ServerSocket(port);
        } catch (Exception e) {
            traceError("WebServer.run/init: " + e);

            return;
        }

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

                thread = new Thread(c);

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

    static void printHelp() {

        Trace.printSystemOut(
            "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_page <file>  default page when page name is missing\n"
            + "    -silent <true/false>  false means display all queries\n"
            + "    -trace <true/false>   display JDBC trace messages\n"
            + "The command line arguments override the values in the webserver.properties file.");
    }

    void printTraceMessages() {

        trace("server.port        ="
              + serverProperties.getProperty("server.port"));
        trace("server.database    ="
              + serverProperties.getProperty("server.database"));
        trace("server.root        ="
              + serverProperties.getProperty("server.root"));
        trace("server.default_page="
              + serverProperties.getProperty("server.default_page"));
        trace("server.silent      ="
              + serverProperties.getProperty("server.silent"));
        Trace.printSystemOut("HSQLDB web server " + jdbcDriver.VERSION
                             + " is running");
        Trace.printSystemOut(
            "Use SHUTDOWN to close normally. Use [Ctrl]+[C] to abort abruptly");
    }
}