org.hsqldb

Class WebServer

Implemented Interfaces:
org.hsqldb.HsqlSocketRequestHandler

public class WebServer
extends Server

The HSQLDB HTTP protocol network database server.

WebServer has two distinct functions:

The primary function is to allow client/server access to HSQLDB databases via the HTTP protocol. This protocol is less efficient than the HSQL protocol used by the Server class and should be used only in situations where sandboxes or firewalls between the client and the server do not allow the use of the HSQL protocol. One example is client/server access by an applet running in browsers on remote hosts and accessing the database engine on the HTTP server from which the applet originated. From version 1.7.2, HTTP database connections are persistent and support transactions. Similar to HSQL connections, they should be explicitly closed to free the server resources.

The secondary function of WebServer is to act as a simple general purpose HTTP server. It is aimed to support the minimum requirements set out by the HTTP/1.0 standard. The HEAD and GET methods can be used to query and retreive static files from the HTTP server.

Both the database server and HTTP server functions of WebServer can be configured with the webserver.properties file. It contains entries for the database server similar to those for the HSQL protocol Server class. In addition, a list mapping different file endings to their mime types may be included in this file. (fredt@users)

From the command line, the options are as follows:

 +----------------+-------------+----------+------------------------------+
 |    OPTION      |    TYPE     | DEFAULT  |         DESCRIPTION          |
 +----------------+-------------+----------+------------------------------|
 | -?             | --          | --       | prints this message          |
 | -address       | name|number | any      | server inet address          |
 | -port          | number      | 80       | port at which server listens |
 | -database.i    | [type]spec  | 0=test   | path of database i           |
 | -dbname.i      | alias       | --       | url alias for database i     |
 | -silent        | true|false  | true     | false => display all queries |
 | -trace         | true|false  | false    | display JDBC trace messages  |
 | -no_system_exit| true|false  | false    | do not issue System.exit()   |
 +----------------+-------------+----------+------------------------------+
 
Example of the webserver.properties file:
 server.port=80
 server.database.0=test
 server.dbname.0=...
 ...
 server.database.n=...
 server.dbname.n=...
 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
 
Replaces original Hypersonic class of the same name.
Authors:
fredt@users
boucherb@users
Since:
1.7.2

Constructor Summary

WebServer()

Method Summary

String
getDefaultWebPage()
Retrieves the name of the web page served when no page is specified.
String
getHelpString()
Retrieves a String object describing the command line and properties options for this Server.
String
getProductName()
Retrieves this server's product name.
String
getProtocol()
Retrieves a string respresentaion of the network protocol this server offers, typically one of 'HTTP', HTTPS', 'HSQL' or 'HSQLS'.
String
getWebRoot()
Retrieves the root context (directory) from which web content is served.
static void
main(String[] args)
Starts a new WebServer.

Methods inherited from class org.hsqldb.Server

checkRunning, getAddress, getDatabaseName, getDatabasePath, getDatabaseType, getDefaultWebPage, getErrWriter, getHelpString, getLogWriter, getPort, getProductName, getProductVersion, getProtocol, getServerError, getServerId, getState, getStateDescriptor, getWebRoot, handleConnection, isNoSystemExit, isRestartOnShutdown, isSilent, isTls, isTrace, main, putPropertiesFromFile, putPropertiesFromString, setAddress, setDatabaseName, setDatabasePath, setDefaultWebPage, setErrWriter, setLogWriter, setNoSystemExit, setPort, setProperties, setRestartOnShutdown, setSilent, setTls, setTrace, setWebRoot, shutdown, signalCloseAllServerConnections, start, stop

Constructor Details

WebServer

public WebServer()

Method Details

getDefaultWebPage

public String getDefaultWebPage()
Retrieves the name of the web page served when no page is specified. This attribute is relevant only when server protocol is HTTP(S).
Overrides:
getDefaultWebPage in interface Server
Returns:
the name of the web page served when no page is specified

getHelpString

public String getHelpString()
Retrieves a String object describing the command line and properties options for this Server.
Overrides:
getHelpString in interface Server
Returns:
the command line and properties options help for this Server

getProductName

public String getProductName()
Retrieves this server's product name.

Typically, this will be something like: "HSQLDB xxx server".

Overrides:
getProductName in interface Server
Returns:
the product name of this server

getProtocol

public String getProtocol()
Retrieves a string respresentaion of the network protocol this server offers, typically one of 'HTTP', HTTPS', 'HSQL' or 'HSQLS'.
Overrides:
getProtocol in interface Server
Returns:
string respresentation of this server's protocol

getWebRoot

public String getWebRoot()
Retrieves the root context (directory) from which web content is served. This property is relevant only when the server protocol is HTTP(S). Although unlikely, it may be that in the future other contexts, such as jar urls may be supported, so that pages can be served from the contents of a jar or from the JVM class path.
Overrides:
getWebRoot in interface Server
Returns:
the root context (directory) from which web content is served

main

public static void main(String[] args)
Starts a new WebServer.
Overrides:
main in interface Server
Parameters:
args - the "command line" parameters with which to start the WebServer. "-?" will cause the command line arguments help to be printed to the standard output

Copyright B) 2001 - 2005 HSQL Development Group. All Rights Reserved.