org.apache.taglibs.scrape
Class HttpConnection

java.lang.Object
  org.apache.taglibs.scrape.HttpConnection

public class HttpConnection
extends java.lang.Object

HttpConnection - the class that creates the http connection that the rest of the package uses

Version:

1.0

Author:

Rich Catlett

Constructor Summary

HttpConnection(java.net.URL url, int port, java.lang.String server, java.lang.String authstring, javax.servlet.jsp.PageContext pc)
constructor creates an instance of HttpConnection and calls the super class HttpURLConnection, this instance of the class connects through a proxy server that requires authentication

HttpConnection(java.net.URL url, PageData pd, javax.servlet.jsp.PageContext pc)
constructor creates an instance of HttpConnection and calls the super class HttpURLConnection

Method Summary

void	connect() Implementation of the abstract method defined in the URLConnection class establish a connection to an HTTP server and send request
void	disconnect() Implementation of the abstract method defined in the HttpURLConnection class cut the current connection this object has
long	getExpiration() Override default provided in URLConnection
java.lang.String	getHeaderField(int n) Override default provided in URLConnection
java.lang.String	getHeaderField(java.lang.String key) Override default provided in URLConnection
int	getHeaderFieldInt(java.lang.String key, int n) Override default provided in URLConnection
java.lang.String	getHeaderFieldKey(int n) Override default provided in URLConnection
java.io.InputStream	getInputStream() Override the default method provided in the URLConnection class
long	getLastModified() Override default provided in URLConnection
java.io.OutputStream	getOutputStream() Override the default method provided in the URLConnection class
java.lang.String	getRequestMethod() get the request method
int	getResponseCode() Override the default method provided in the HttpURLConnection class Get the response code for this connection
java.lang.String	getResponseMessage() Override the default method provided in the HttpURLConnection class Get the response message for the last request
java.net.URL	getURL() get the URL of this connection
void	sendRequest() send the request to the server
void	setRequestMethod(java.lang.String value) set the request method
protected void	setURL(java.lang.String value) Set the URL for this connection
boolean	usingProxy() Implementation of the abstract method defined in the HttpURLConnection class this implementation does not use proxy

Methods inherited from class java.lang.Object

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

Constructor Detail

HttpConnection

public HttpConnection(java.net.URL url,
                      PageData pd,
                      javax.servlet.jsp.PageContext pc)

constructor creates an instance of HttpConnection and calls the super class HttpURLConnection

Parameters:

url - - url of the http server to connect to

HttpConnection

public HttpConnection(java.net.URL url,
                      int port,
                      java.lang.String server,
                      java.lang.String authstring,
                      javax.servlet.jsp.PageContext pc)

constructor creates an instance of HttpConnection and calls the super class HttpURLConnection, this instance of the class connects through a proxy server that requires authentication

Parameters:

url - url of the http server to connect to

port - the port to use for the connection to the proxy server

server - the proxy server

secure - is the link going over https

name - user name for authentication

pass - password for authentication

Method Detail

connect

public void connect()
             throws java.io.IOException

Implementation of the abstract method defined in the URLConnection class establish a connection to an HTTP server and send request

Throws:

java.io.IOException - - if connection cannot be made

disconnect

public void disconnect()

Implementation of the abstract method defined in the HttpURLConnection class cut the current connection this object has

usingProxy

public boolean usingProxy()

Implementation of the abstract method defined in the HttpURLConnection class this implementation does not use proxy

Returns:

false proxy servers not used by this implementation

getInputStream

public java.io.InputStream getInputStream()
                                   throws java.io.IOException

Override the default method provided in the URLConnection class

Throws:

java.io.IOException

getOutputStream

public java.io.OutputStream getOutputStream()
                                     throws java.io.IOException

Override the default method provided in the URLConnection class

Throws:

java.io.IOException

getRequestMethod

public java.lang.String getRequestMethod()

get the request method

Returns:

- the request method

setRequestMethod

public void setRequestMethod(java.lang.String value)

set the request method

Parameters:

String - GET or HEAD

getResponseCode

public int getResponseCode()

Override the default method provided in the HttpURLConnection class Get the response code for this connection

Returns:

- the response code of the connection, -1 if no valid response

getResponseMessage

public java.lang.String getResponseMessage()

Override the default method provided in the HttpURLConnection class Get the response message for the last request

Returns:

- the response message of the last request

sendRequest

public void sendRequest()
                 throws java.io.IOException

send the request to the server

Throws:

java.io.IOException

getHeaderField

public java.lang.String getHeaderField(int n)

Override default provided in URLConnection

Parameters:

n - - index of the desired header field

getLastModified

public long getLastModified()

Override default provided in URLConnection

Returns:

- LastModified header or 0 if LastModified does not exist

getExpiration

public long getExpiration()

Override default provided in URLConnection

Returns:

- the Expiration header or 0 if Expiration does not exist

getHeaderField

public java.lang.String getHeaderField(java.lang.String key)

Override default provided in URLConnection

Parameters:

key - - name of the desired header field

getHeaderFieldInt

public int getHeaderFieldInt(java.lang.String key,
                             int n)

Override default provided in URLConnection

Parameters:

n - value returned if header is null

key - header to retreive

Returns:

- header as an integer

getHeaderFieldKey

public java.lang.String getHeaderFieldKey(int n)

Override default provided in URLConnection

Parameters:

n - - index of the desired header field

setURL

protected void setURL(java.lang.String value)
               throws java.net.MalformedURLException

Set the URL for this connection

Throws:

java.net.MalformedURLException

getURL

public java.net.URL getURL()

get the URL of this connection

Returns:

- the URL for this connection