Javassist 3.30.2-GA · javassist.tools.web.Viewer · APIdia, the JavaDoc alternative

public Class Viewer

A sample applet viewer.

This is a sort of applet viewer that can run any program even if the main class is not a subclass of Applet. This viewwer first calls main() in the main class.

To run, you should type:

% java javassist.tools.web.Viewer host port Main arg1, ...

This command calls Main.main() with arg1,... All classes including Main are fetched from a server http://host:port. Only the class file for Viewer must exist on a local file system at the client side; even other javassist.* classes are not needed at the client side. Viewer uses only Java core API classes.

Note

since a Viewer object is a class loader, a program loaded by this object can call a method in Viewer. For example, you can write something like this:

Viewer v = (Viewer)this.getClass().getClassLoader();
String port = v.getPort();

Field Summary

Modifier and Type	Field and Description
private int	port
private String	server

Constructor Summary

Access	Constructor and Description
public	Viewer(String server name host, int port number p) Constructs a viewer.

Method Summary

Modifier and Type	Method and Description
protected byte[]	fetchClass(String classname) Fetches the class file of the specified class from the http server.
protected Class<?>	findClass(String The binary name of the class name) Overrides java.lang.ClassLoader.findClass. Finds the specified class.
public int	getPort() Returns the port number.
public String	getServer() Returns the server name.
protected synchronized Class<?>	loadClass(String The binary name of the class name, boolean If `true` then resolve the class resolve) Overrides java.lang.ClassLoader.loadClass. Requests the class loader to load a class.
public static void	main(String[] args) Starts a program.
private byte[]	readStream(InputStream fin)
public void	run(String executed class classname, String[] the arguments passed to `main()`. args) Invokes main() in the class specified by `classname`.

Modifier and Type

Method and Description

protected byte[]

fetchClass(String classname)

Fetches the class file of the specified class from the http server.

protected Class<?>

findClass(String

The binary name of the class

name)

Overrides java.lang.ClassLoader.findClass.

Finds the specified class.

public int

getPort()

Returns the port number.

public String

getServer()

Returns the server name.

protected synchronized Class<?>

loadClass(String

The binary name of the class

name, boolean

If true then resolve the class

resolve)

Overrides java.lang.ClassLoader.loadClass.

Requests the class loader to load a class.

public static void

main(String[] args)

Starts a program.

private byte[]

readStream(InputStream fin)

public void

run(String

executed class

classname, String[]

the arguments passed to main().

args)

Invokes main() in the class specified by classname.

Field Detail

port	back to summary
private int port

server	back to summary
private String server

Constructor Detail

Viewer	back to summary
public Viewer(String host, int p) Constructs a viewer. Parameters host:String server name p:int port number

Viewer

back to summary

public Viewer(String host, int p)

Constructs a viewer.

Parameters

host:String: server name
p:int: port number

Method Detail

fetchClass	back to summary
protected byte[] fetchClass(String classname) throws Exception Fetches the class file of the specified class from the http server.

findClass back to summary

findClass	back to summary
protected Class<?> findClass(String name) throws ClassNotFoundException Overrides java.lang.ClassLoader.findClass. Finds the specified class. The implementation in this class fetches the class from the http server. If the class is either `java.`, `javax.`, or `Viewer`, then it is loaded by the parent class loader. This method can be overridden by a subclass of `Viewer`. Parameters name:String Doc from java.lang.ClassLoader.findClass. The binary name of the class Returns:Class<?> Doc from java.lang.ClassLoader.findClass. The resulting `Class` object Annotations @Override Exceptions ClassNotFoundException: Doc from java.lang.ClassLoader.findClass. If the class could not be found

protected Class<?> findClass(String name) throws ClassNotFoundException

Overrides java.lang.ClassLoader.findClass.

Finds the specified class. The implementation in this class fetches the class from the http server. If the class is either java.*, javax.*, or Viewer, then it is loaded by the parent class loader.

This method can be overridden by a subclass of Viewer.

Parameters

name:String

Doc from java.lang.ClassLoader.findClass.

The binary name of the class

Returns:Class<?>

Doc from java.lang.ClassLoader.findClass.

The resulting Class object

Annotations

@Override

Exceptions

ClassNotFoundException:

Doc from java.lang.ClassLoader.findClass.

If the class could not be found

getPort	back to summary
public int getPort() Returns the port number.

getServer	back to summary
public String getServer() Returns the server name.

loadClass back to summary

loadClass	back to summary
protected synchronized Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException Overrides java.lang.ClassLoader.loadClass. Requests the class loader to load a class. Parameters name:String Doc from java.lang.ClassLoader.loadClass. The binary name of the class resolve:boolean Doc from java.lang.ClassLoader.loadClass. If `true` then resolve the class Returns:Class<?> Doc from java.lang.ClassLoader.loadClass. The resulting `Class` object Annotations @Override Exceptions ClassNotFoundException: Doc from java.lang.ClassLoader.loadClass. If the class could not be found

protected synchronized Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException

Overrides java.lang.ClassLoader.loadClass.

Requests the class loader to load a class.

Parameters

name:String

Doc from java.lang.ClassLoader.loadClass.

The binary name of the class

resolve:boolean

Doc from java.lang.ClassLoader.loadClass.

If true then resolve the class

Returns:Class<?>

Doc from java.lang.ClassLoader.loadClass.

The resulting Class object

Annotations

@Override

Exceptions

ClassNotFoundException:

Doc from java.lang.ClassLoader.loadClass.

If the class could not be found

main	back to summary
public static void main(String[] args) throws Throwable Starts a program.

readStream	back to summary
private byte[] readStream(InputStream fin) throws IOException

run back to summary

run	back to summary
public void run(String classname, String[] args) throws Throwable Invokes main() in the class specified by `classname`. Parameters classname:String executed class args:String[] the arguments passed to `main()`.

public void run(String classname, String[] args) throws Throwable

Invokes main() in the class specified by classname.

Parameters

classname:String: executed class
args:String[]: the arguments passed to main().