Package javassist.tools.web

Class Webserver

java.lang.Object

javassist.tools.web.Webserver

Direct Known Subclasses:

AppletServer

public class Webserver
extends Object

A web server for running sample programs.

This enables a Java program to instrument class files loaded by web browsers for applets. Since the (standard) security manager does not allow an applet to create and use a class loader, instrumenting class files must be done by this web server.

Note: although this class is included in the Javassist API, it is provided as a sample implementation of the web server using Javassist. Especially, there might be security flaws in this server. Please use this with YOUR OWN RISK.

Field Summary

Fields

Modifier and Type	Field	Description
private ClassPool	classPool
String	debugDir	If this field is not null, the class files taken from ClassPool are written out under the directory specified by this field.
private static final byte[]	endofline
String	htmlfileBase	The top directory of html (and .gif, .class, ...) files.
private ServerSocket	socket
protected Translator	translator
private static final int	typeClass
private static final int	typeGif
private static final int	typeHtml
private static final int	typeJpeg
private static final int	typeText

Constructor Summary

Constructors

Constructor	Description
Webserver(int port)	Constructs a web server.
Webserver(String port)	Constructs a web server.

Method Summary

Modifier and Type	Method	Description
void	addTranslator(ClassPool cp, Translator t)	Adds a translator, which is called whenever a client requests a class file.
private void	checkFilename(String filename, int len)
void	doReply(InputStream in, OutputStream out, String cmd)	Proceses a HTTP request from a client.
void	end()	Closes the socket.
private boolean	letUsersSendClassfile(OutputStream out, String filename, int length)
void	logging(String msg)	Prints a log message.
void	logging(String msg1, String msg2)	Prints a log message.
void	logging(String msg1, String msg2, String msg3)	Prints a log message.
void	logging2(String msg)	Prints a log message with indentation.
static void	main(String[] args)	Starts a web server.
(package private) final void	process(Socket clnt)
private String	readLine(InputStream in)
private void	replyError(OutputStream out, BadHttpRequest e)
void	run()	Begins the HTTP service.
private void	sendHeader(OutputStream out, long dataLength, int filetype)
void	setClassPool(ClassPool loader)	Requests the web server to use the specified ClassPool object for obtaining a class file.
private int	skipLine(InputStream in)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

socket

private ServerSocket socket

classPool

private ClassPool classPool

translator

protected Translator translator

endofline

private static final byte[] endofline

typeHtml

private static final int typeHtml

See Also:

• Constant Field Values

typeClass

private static final int typeClass

See Also:

• Constant Field Values

typeGif

private static final int typeGif

See Also:

• Constant Field Values

typeJpeg

private static final int typeJpeg

See Also:

• Constant Field Values

typeText

private static final int typeText

See Also:

• Constant Field Values

debugDir

public String debugDir

If this field is not null, the class files taken from ClassPool are written out under the directory specified by this field. The directory name must not end with a directory separator.

htmlfileBase

public String htmlfileBase

The top directory of html (and .gif, .class, ...) files. It must end with the directory separator such as "/". (For portability, "/" should be used as the directory separator. Javassist automatically translates "/" into a platform-dependent character.) If this field is null, the top directory is the current one where the JVM is running.

If the given URL indicates a class file and the class file is not found under the directory specified by this variable, then Class.getResourceAsStream() is called for searching the Java class paths.

Constructor Details

Webserver

public Webserver(String port)
          throws IOException

Constructs a web server.

Parameters:

port - port number

Throws:

IOException

Webserver

public Webserver(int port)
          throws IOException

Constructs a web server.

Parameters:

port - port number

Throws:

IOException

Method Details

main

public static void main(String[] args)
                 throws IOException

Starts a web server. The port number is specified by the first argument.

Throws:

IOException

setClassPool

public void setClassPool(ClassPool loader)

Requests the web server to use the specified ClassPool object for obtaining a class file.

addTranslator

public void addTranslator(ClassPool cp,
 Translator t)
                   throws NotFoundException,
CannotCompileException

Adds a translator, which is called whenever a client requests a class file.

Parameters:

cp - the ClassPool object for obtaining a class file.

t - a translator.

Throws:

NotFoundException

CannotCompileException

end

public void end()
         throws IOException

Closes the socket.

Throws:

IOException

logging

public void logging(String msg)

Prints a log message.

logging

public void logging(String msg1,
 String msg2)

Prints a log message.

logging

public void logging(String msg1,
 String msg2,
 String msg3)

Prints a log message.

logging2

public void logging2(String msg)

Prints a log message with indentation.

run

public void run()

Begins the HTTP service.

process

final void process(Socket clnt)
            throws IOException

Throws:

IOException

readLine

private String readLine(InputStream in)
                 throws IOException

Throws:

IOException

skipLine

private int skipLine(InputStream in)
              throws IOException

Throws:

IOException

doReply

public void doReply(InputStream in,
 OutputStream out,
 String cmd)
             throws IOException,
BadHttpRequest

Proceses a HTTP request from a client.

Parameters:

out - the output stream to a client

cmd - the command received from a client

Throws:

IOException

BadHttpRequest

checkFilename

private void checkFilename(String filename,
 int len)
                    throws BadHttpRequest

Throws:

BadHttpRequest

letUsersSendClassfile

private boolean letUsersSendClassfile(OutputStream out,
 String filename,
 int length)
                               throws IOException,
BadHttpRequest

Throws:

IOException

BadHttpRequest

sendHeader

private void sendHeader(OutputStream out,
 long dataLength,
 int filetype)
                 throws IOException

Throws:

IOException

replyError

private void replyError(OutputStream out,
 BadHttpRequest e)
                 throws IOException

Throws:

IOException