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SUMMARY: JavaDoc of org.apache.commons.net.nntp.NNTPClient JAVADOC | Sourc code of org.apache.commons.net.nntp.NNTPClient SOURCE | Download org.apache.commons.net.nntp.NNTPClient DOWNLOAD | NESTED | FIELD | CONSTR | METHOD DETAIL: FIELD | CONSTR | METHOD

org.apache.commons.net.nntp
Class NNTPClient  view NNTPClient download NNTPClient.java

java.lang.Object
  extended byorg.apache.commons.net.SocketClient
      extended byorg.apache.commons.net.nntp.NNTP
          extended byorg.apache.commons.net.nntp.NNTPClient
public class NNTPClient
extends NNTP

NNTPClient encapsulates all the functionality necessary to post and retrieve articles from an NNTP server. As with all classes derived from org.apache.commons.net.SocketClient, you must first connect to the server with connect 55 before doing anything, and finally disconnect() 55 after you're completely finished interacting with the server. Remember that the isAllowedToPost() 55 method is defined in NNTP.

You should keep in mind that the NNTP server may choose to prematurely close a connection if the client has been idle for longer than a given time period or if the server is being shutdown by the operator or some other reason. The NNTP class will detect a premature NNTP server connection closing when it receives a NNTPReply.SERVICE_DISCONTINUED 55 response to a command. When that occurs, the NNTP class method encountering that reply will throw an NNTPConnectionClosedException . NNTPConectionClosedException is a subclass of IOException and therefore need not be caught separately, but if you are going to catch it separately, its catch block must appear before the more general IOException catch block. When you encounter an NNTPConnectionClosedException , you must disconnect the connection with disconnect() 55 to properly clean up the system resources used by NNTP. Before disconnecting, you may check the last reply code and text with getReplyCode 55 and getReplyString 55 .

Rather than list it separately for each method, we mention here that every method communicating with the server and throwing an IOException can also throw a org.apache.commons.net.MalformedServerReplyException , which is a subclass of IOException. A MalformedServerReplyException will be thrown when the reply received from the server deviates enough from the protocol specification that it cannot be interpreted in a useful manner despite attempts to be as lenient as possible.

Field Summary
 
Fields inherited from class org.apache.commons.net.nntp.NNTP
_commandSupport_, _isAllowedToPost, _reader_, _replyCode, _replyString, _writer_, DEFAULT_PORT
 
Fields inherited from class org.apache.commons.net.SocketClient
_defaultPort_, _input_, _isConnected_, _output_, _socket_, _socketFactory_, _timeout_, NETASCII_EOL
 
Constructor Summary
NNTPClient()
           
 
Method Summary
private  void __parseArticlePointer(java.lang.String reply, ArticlePointer pointer)
           
private  void __parseGroupReply(java.lang.String reply, NewsgroupInfo info)
           
private  NewsgroupInfo __parseNewsgroupListEntry(java.lang.String entry)
           
private  NewsgroupInfo[] __readNewsgroupListing()
           
private  java.io.Reader __retrieve(int command, int articleNumber, ArticlePointer pointer)
           
private  java.io.Reader __retrieve(int command, java.lang.String articleId, ArticlePointer pointer)
           
private  java.io.Reader __retrieveArticleInfo(java.lang.String articleRange)
          Private implementation of XOVER functionality.
private  java.io.Reader __retrieveHeader(java.lang.String header, java.lang.String articleRange)
          Private implementation of XHDR functionality.
 boolean authenticate(java.lang.String username, java.lang.String password)
          Log into a news server by sending the AUTHINFO USER/AUTHINFO PASS command sequence.
 boolean completePendingCommand()
          There are a few NNTPClient methods that do not complete the entire sequence of NNTP commands to complete a transaction.
 java.io.Writer forwardArticle(java.lang.String articleId)
           
 java.lang.String listHelp()
          List the command help from the server.
 java.lang.String[] listNewNews(NewGroupsOrNewsQuery query)
          List all new articles added to the NNTP server since a particular date subject to the conditions of the specified query.
 NewsgroupInfo[] listNewNewsgroups(NewGroupsOrNewsQuery query)
          List all new newsgroups added to the NNTP server since a particular date subject to the conditions of the specified query.
 NewsgroupInfo[] listNewsgroups()
          List all newsgroups served by the NNTP server.
 NewsgroupInfo[] listNewsgroups(java.lang.String wildmat)
          An overloaded listNewsgroups() command that allows us to specify with a pattern what groups we want to list.
 boolean logout()
          Logs out of the news server gracefully by sending the QUIT command.
 java.io.Writer postArticle()
          Post an article to the NNTP server.
 java.io.Reader retrieveArticle()
          Same as retrieveArticle(null)
 java.io.Reader retrieveArticle(int articleNumber)
          Same as retrieveArticle(articleNumber, null)
 java.io.Reader retrieveArticle(int articleNumber, ArticlePointer pointer)
          Retrieves an article from the currently selected newsgroup.
 java.io.Reader retrieveArticle(java.lang.String articleId)
          Same as retrieveArticle(articleId, null)
 java.io.Reader retrieveArticle(java.lang.String articleId, ArticlePointer pointer)
          Retrieves an article from the NNTP server.
 java.io.Reader retrieveArticleBody()
          Same as retrieveArticleBody(null)
 java.io.Reader retrieveArticleBody(int articleNumber)
          Same as retrieveArticleBody(articleNumber, null)
 java.io.Reader retrieveArticleBody(int articleNumber, ArticlePointer pointer)
          Retrieves an article body from the currently selected newsgroup.
 java.io.Reader retrieveArticleBody(java.lang.String articleId)
          Same as retrieveArticleBody(articleId, null)
 java.io.Reader retrieveArticleBody(java.lang.String articleId, ArticlePointer pointer)
          Retrieves an article body from the NNTP server.
 java.io.Reader retrieveArticleHeader()
          Same as retrieveArticleHeader(null)
 java.io.Reader retrieveArticleHeader(int articleNumber)
          Same as retrieveArticleHeader(articleNumber, null)
 java.io.Reader retrieveArticleHeader(int articleNumber, ArticlePointer pointer)
          Retrieves an article header from the currently selected newsgroup.
 java.io.Reader retrieveArticleHeader(java.lang.String articleId)
          Same as retrieveArticleHeader(articleId, null)
 java.io.Reader retrieveArticleHeader(java.lang.String articleId, ArticlePointer pointer)
          Retrieves an article header from the NNTP server.
 java.io.Reader retrieveArticleInfo(int articleNumber)
          Return article headers for a specified post.
 java.io.Reader retrieveArticleInfo(int lowArticleNumber, int highArticleNumber)
          Return article headers for all articles between lowArticleNumber and highArticleNumber, inclusively.
 java.io.Reader retrieveHeader(java.lang.String header, int articleNumber)
          Return an article header for a specified post.
 java.io.Reader retrieveHeader(java.lang.String header, int lowArticleNumber, int highArticleNumber)
          Return an article header for all articles between lowArticleNumber and highArticleNumber, inclusively.
 boolean selectArticle(ArticlePointer pointer)
          Same as selectArticle(null, articleId) .
 boolean selectArticle(int articleNumber)
          Same as selectArticle(articleNumber, null)
 boolean selectArticle(int articleNumber, ArticlePointer pointer)
          Select an article in the currently selected newsgroup by its number.
 boolean selectArticle(java.lang.String articleId)
          Same as selectArticle(articleId, null)
 boolean selectArticle(java.lang.String articleId, ArticlePointer pointer)
          Select an article by its unique identifier (including enclosing < and >) and return its article number and id through the pointer parameter.
 boolean selectNewsgroup(java.lang.String newsgroup)
          Same as selectNewsgroup(newsgroup, null)
 boolean selectNewsgroup(java.lang.String newsgroup, NewsgroupInfo info)
          Select the specified newsgroup to be the target of for future article retrieval and posting operations.
 boolean selectNextArticle()
          Same as selectNextArticle(null)
 boolean selectNextArticle(ArticlePointer pointer)
          Select the article following the currently selected article in the currently selected newsgroup and return its number and unique id through the pointer parameter.
 boolean selectPreviousArticle()
          Same as selectPreviousArticle(null)
 boolean selectPreviousArticle(ArticlePointer pointer)
          Select the article preceeding the currently selected article in the currently selected newsgroup and return its number and unique id through the pointer parameter.
 
Methods inherited from class org.apache.commons.net.nntp.NNTP
_connectAction_, addProtocolCommandListener, article, article, article, authinfoPass, authinfoUser, body, body, body, disconnect, getReply, getReplyCode, getReplyString, group, head, head, head, help, ihave, isAllowedToPost, last, list, listActive, newgroups, newnews, next, post, quit, removeProtocolCommandListener, sendCommand, sendCommand, sendCommand, sendCommand, stat, stat, stat, xhdr, xover
 
Methods inherited from class org.apache.commons.net.SocketClient
connect, connect, connect, connect, connect, connect, getDefaultPort, getDefaultTimeout, getLocalAddress, getLocalPort, getRemoteAddress, getRemotePort, getSoLinger, getSoTimeout, getTcpNoDelay, isConnected, setDefaultPort, setDefaultTimeout, setSocketFactory, setSoLinger, setSoTimeout, setTcpNoDelay, verifyRemote
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

NNTPClient

public NNTPClient()
Method Detail

__parseArticlePointer

private void __parseArticlePointer(java.lang.String reply,
                                   ArticlePointer pointer)
                            throws org.apache.commons.net.MalformedServerReplyException

__parseGroupReply

private void __parseGroupReply(java.lang.String reply,
                               NewsgroupInfo info)
                        throws org.apache.commons.net.MalformedServerReplyException

__parseNewsgroupListEntry

private NewsgroupInfo __parseNewsgroupListEntry(java.lang.String entry)

__readNewsgroupListing

private NewsgroupInfo[] __readNewsgroupListing()
                                        throws java.io.IOException

__retrieve

private java.io.Reader __retrieve(int command,
                                  java.lang.String articleId,
                                  ArticlePointer pointer)
                           throws java.io.IOException

__retrieve

private java.io.Reader __retrieve(int command,
                                  int articleNumber,
                                  ArticlePointer pointer)
                           throws java.io.IOException

retrieveArticle

public java.io.Reader retrieveArticle(java.lang.String articleId,
                                      ArticlePointer pointer)
                               throws java.io.IOException
Retrieves an article from the NNTP server. The article is referenced by its unique article identifier (including the enclosing < and >). The article number and identifier contained in the server reply are returned through an ArticlePointer. The articleId field of the ArticlePointer cannot always be trusted because some NNTP servers do not correctly follow the RFC 977 reply format.

A DotTerminatedMessageReader is returned from which the article can be read. If the article does not exist, null is returned.

You must not issue any commands to the NNTP server (i.e., call any other methods) until you finish reading the message from the returned Reader instance. The NNTP protocol uses the same stream for issuing commands as it does for returning results. Therefore the returned Reader actually reads directly from the NNTP connection. After the end of message has been reached, new commands can be executed and their replies read. If you do not follow these requirements, your program will not work properly.

retrieveArticle

public java.io.Reader retrieveArticle(java.lang.String articleId)
                               throws java.io.IOException
Same as retrieveArticle(articleId, null)

retrieveArticle

public java.io.Reader retrieveArticle()
                               throws java.io.IOException
Same as retrieveArticle(null)

retrieveArticle

public java.io.Reader retrieveArticle(int articleNumber,
                                      ArticlePointer pointer)
                               throws java.io.IOException
Retrieves an article from the currently selected newsgroup. The article is referenced by its article number. The article number and identifier contained in the server reply are returned through an ArticlePointer. The articleId field of the ArticlePointer cannot always be trusted because some NNTP servers do not correctly follow the RFC 977 reply format.

A DotTerminatedMessageReader is returned from which the article can be read. If the article does not exist, null is returned.

You must not issue any commands to the NNTP server (i.e., call any other methods) until you finish reading the message from the returned Reader instance. The NNTP protocol uses the same stream for issuing commands as it does for returning results. Therefore the returned Reader actually reads directly from the NNTP connection. After the end of message has been reached, new commands can be executed and their replies read. If you do not follow these requirements, your program will not work properly.

retrieveArticle

public java.io.Reader retrieveArticle(int articleNumber)
                               throws java.io.IOException
Same as retrieveArticle(articleNumber, null)

retrieveArticleHeader

public java.io.Reader retrieveArticleHeader(java.lang.String articleId,
                                            ArticlePointer pointer)
                                     throws java.io.IOException
Retrieves an article header from the NNTP server. The article is referenced by its unique article identifier (including the enclosing < and >). The article number and identifier contained in the server reply are returned through an ArticlePointer. The articleId field of the ArticlePointer cannot always be trusted because some NNTP servers do not correctly follow the RFC 977 reply format.

A DotTerminatedMessageReader is returned from which the article can be read. If the article does not exist, null is returned.

You must not issue any commands to the NNTP server (i.e., call any other methods) until you finish reading the message from the returned Reader instance. The NNTP protocol uses the same stream for issuing commands as it does for returning results. Therefore the returned Reader actually reads directly from the NNTP connection. After the end of message has been reached, new commands can be executed and their replies read. If you do not follow these requirements, your program will not work properly.

retrieveArticleHeader

public java.io.Reader retrieveArticleHeader(java.lang.String articleId)
                                     throws java.io.IOException
Same as retrieveArticleHeader(articleId, null)

retrieveArticleHeader

public java.io.Reader retrieveArticleHeader()
                                     throws java.io.IOException
Same as retrieveArticleHeader(null)

retrieveArticleHeader

public java.io.Reader retrieveArticleHeader(int articleNumber,
                                            ArticlePointer pointer)
                                     throws java.io.IOException
Retrieves an article header from the currently selected newsgroup. The article is referenced by its article number. The article number and identifier contained in the server reply are returned through an ArticlePointer. The articleId field of the ArticlePointer cannot always be trusted because some NNTP servers do not correctly follow the RFC 977 reply format.

A DotTerminatedMessageReader is returned from which the article can be read. If the article does not exist, null is returned.

You must not issue any commands to the NNTP server (i.e., call any other methods) until you finish reading the message from the returned Reader instance. The NNTP protocol uses the same stream for issuing commands as it does for returning results. Therefore the returned Reader actually reads directly from the NNTP connection. After the end of message has been reached, new commands can be executed and their replies read. If you do not follow these requirements, your program will not work properly.

retrieveArticleHeader

public java.io.Reader retrieveArticleHeader(int articleNumber)
                                     throws java.io.IOException
Same as retrieveArticleHeader(articleNumber, null)

retrieveArticleBody

public java.io.Reader retrieveArticleBody(java.lang.String articleId,
                                          ArticlePointer pointer)
                                   throws java.io.IOException
Retrieves an article body from the NNTP server. The article is referenced by its unique article identifier (including the enclosing < and >). The article number and identifier contained in the server reply are returned through an ArticlePointer. The articleId field of the ArticlePointer cannot always be trusted because some NNTP servers do not correctly follow the RFC 977 reply format.

A DotTerminatedMessageReader is returned from which the article can be read. If the article does not exist, null is returned.

You must not issue any commands to the NNTP server (i.e., call any other methods) until you finish reading the message from the returned Reader instance. The NNTP protocol uses the same stream for issuing commands as it does for returning results. Therefore the returned Reader actually reads directly from the NNTP connection. After the end of message has been reached, new commands can be executed and their replies read. If you do not follow these requirements, your program will not work properly.

retrieveArticleBody

public java.io.Reader retrieveArticleBody(java.lang.String articleId)
                                   throws java.io.IOException
Same as retrieveArticleBody(articleId, null)

retrieveArticleBody

public java.io.Reader retrieveArticleBody()
                                   throws java.io.IOException
Same as retrieveArticleBody(null)

retrieveArticleBody

public java.io.Reader retrieveArticleBody(int articleNumber,
                                          ArticlePointer pointer)
                                   throws java.io.IOException
Retrieves an article body from the currently selected newsgroup. The article is referenced by its article number. The article number and identifier contained in the server reply are returned through an ArticlePointer. The articleId field of the ArticlePointer cannot always be trusted because some NNTP servers do not correctly follow the RFC 977 reply format.

A DotTerminatedMessageReader is returned from which the article can be read. If the article does not exist, null is returned.

You must not issue any commands to the NNTP server (i.e., call any other methods) until you finish reading the message from the returned Reader instance. The NNTP protocol uses the same stream for issuing commands as it does for returning results. Therefore the returned Reader actually reads directly from the NNTP connection. After the end of message has been reached, new commands can be executed and their replies read. If you do not follow these requirements, your program will not work properly.

retrieveArticleBody

public java.io.Reader retrieveArticleBody(int articleNumber)
                                   throws java.io.IOException
Same as retrieveArticleBody(articleNumber, null)

selectNewsgroup

public boolean selectNewsgroup(java.lang.String newsgroup,
                               NewsgroupInfo info)
                        throws java.io.IOException
Select the specified newsgroup to be the target of for future article retrieval and posting operations. Also return the newsgroup information contained in the server reply through the info parameter.

selectNewsgroup

public boolean selectNewsgroup(java.lang.String newsgroup)
                        throws java.io.IOException
Same as selectNewsgroup(newsgroup, null)

listHelp

public java.lang.String listHelp()
                          throws java.io.IOException
List the command help from the server.

selectArticle

public boolean selectArticle(java.lang.String articleId,
                             ArticlePointer pointer)
                      throws java.io.IOException
Select an article by its unique identifier (including enclosing < and >) and return its article number and id through the pointer parameter. This is achieved through the STAT command. According to RFC 977, this will NOT set the current article pointer on the server. To do that, you must reference the article by its number.

selectArticle

public boolean selectArticle(java.lang.String articleId)
                      throws java.io.IOException
Same as selectArticle(articleId, null)

selectArticle

public boolean selectArticle(ArticlePointer pointer)
                      throws java.io.IOException
Same as selectArticle(null, articleId) . Useful for retrieving the current article number.

selectArticle

public boolean selectArticle(int articleNumber,
                             ArticlePointer pointer)
                      throws java.io.IOException
Select an article in the currently selected newsgroup by its number. and return its article number and id through the pointer parameter. This is achieved through the STAT command. According to RFC 977, this WILL set the current article pointer on the server. Use this command to select an article before retrieving it, or to obtain an article's unique identifier given its number.

selectArticle

public boolean selectArticle(int articleNumber)
                      throws java.io.IOException
Same as selectArticle(articleNumber, null)

selectPreviousArticle

public boolean selectPreviousArticle(ArticlePointer pointer)
                              throws java.io.IOException
Select the article preceeding the currently selected article in the currently selected newsgroup and return its number and unique id through the pointer parameter. Because of deviating server implementations, the articleId information cannot be trusted. To obtain the article identifier, issue a selectArticle(pointer.articleNumber, pointer) immediately afterward.

selectPreviousArticle

public boolean selectPreviousArticle()
                              throws java.io.IOException
Same as selectPreviousArticle(null)

selectNextArticle

public boolean selectNextArticle(ArticlePointer pointer)
                          throws java.io.IOException
Select the article following the currently selected article in the currently selected newsgroup and return its number and unique id through the pointer parameter. Because of deviating server implementations, the articleId information cannot be trusted. To obtain the article identifier, issue a selectArticle(pointer.articleNumber, pointer) immediately afterward.

selectNextArticle

public boolean selectNextArticle()
                          throws java.io.IOException
Same as selectNextArticle(null)

listNewsgroups

public NewsgroupInfo[] listNewsgroups()
                               throws java.io.IOException
List all newsgroups served by the NNTP server. If no newsgroups are served, a zero length array will be returned. If the command fails, null will be returned.

listNewsgroups

public NewsgroupInfo[] listNewsgroups(java.lang.String wildmat)
                               throws java.io.IOException
An overloaded listNewsgroups() command that allows us to specify with a pattern what groups we want to list. Wraps the LIST ACTIVE command.

listNewNewsgroups

public NewsgroupInfo[] listNewNewsgroups(NewGroupsOrNewsQuery query)
                                  throws java.io.IOException
List all new newsgroups added to the NNTP server since a particular date subject to the conditions of the specified query. If no new newsgroups were added, a zero length array will be returned. If the command fails, null will be returned.

listNewNews

public java.lang.String[] listNewNews(NewGroupsOrNewsQuery query)
                               throws java.io.IOException
List all new articles added to the NNTP server since a particular date subject to the conditions of the specified query. If no new new news is found, a zero length array will be returned. If the command fails, null will be returned. You must add at least one newsgroup to the query, else the command will fail. Each String in the returned array is a unique message identifier including the enclosing < and >.

completePendingCommand

public boolean completePendingCommand()
                               throws java.io.IOException
There are a few NNTPClient methods that do not complete the entire sequence of NNTP commands to complete a transaction. These commands require some action by the programmer after the reception of a positive preliminary command. After the programmer's code completes its actions, it must call this method to receive the completion reply from the server and verify the success of the entire transaction.

For example 

 writer = client.postArticle();
 if(writer == null) // failure
   return false;
 header = new SimpleNNTPHeader("foobar@foo.com", "Just testing");
 header.addNewsgroup("alt.test");
 writer.write(header.toString());
 writer.write("This is just a test");
 writer.close();
 if(!client.completePendingCommand()) // failure
   return false;

postArticle

public java.io.Writer postArticle()
                           throws java.io.IOException
Post an article to the NNTP server. This method returns a DotTerminatedMessageWriter instance to which the article can be written. Null is returned if the posting attempt fails. You should check isAllowedToPost() 55 before trying to post. However, a posting attempt can fail due to malformed headers.

You must not issue any commands to the NNTP server (i.e., call any (other methods) until you finish writing to the returned Writer instance and close it. The NNTP protocol uses the same stream for issuing commands as it does for returning results. Therefore the returned Writer actually writes directly to the NNTP connection. After you close the writer, you can execute new commands. If you do not follow these requirements your program will not work properly.

Different NNTP servers will require different header formats, but you can use the provided SimpleNNTPHeader class to construct the bare minimum acceptable header for most news readers. To construct more complicated headers you should refer to RFC 822. When the Java Mail API is finalized, you will be able to use it to compose fully compliant Internet text messages. The DotTerminatedMessageWriter takes care of doubling line-leading dots and ending the message with a single dot upon closing, so all you have to worry about is writing the header and the message.

Upon closing the returned Writer, you need to call completePendingCommand() 55 to finalize the posting and verify its success or failure from the server reply.

forwardArticle

public java.io.Writer forwardArticle(java.lang.String articleId)
                              throws java.io.IOException

logout

public boolean logout()
               throws java.io.IOException
Logs out of the news server gracefully by sending the QUIT command. However, you must still disconnect from the server before you can open a new connection.

authenticate

public boolean authenticate(java.lang.String username,
                            java.lang.String password)
                     throws java.io.IOException
Log into a news server by sending the AUTHINFO USER/AUTHINFO PASS command sequence. This is usually sent in response to a 480 reply code from the NNTP server.

__retrieveArticleInfo

private java.io.Reader __retrieveArticleInfo(java.lang.String articleRange)
                                      throws java.io.IOException
Private implementation of XOVER functionality. See NNTP.xover(java.lang.String) 55 for legal agument formats. Alternatively, read RFC 2980 :-)

retrieveArticleInfo

public java.io.Reader retrieveArticleInfo(int articleNumber)
                                   throws java.io.IOException
Return article headers for a specified post.

retrieveArticleInfo

public java.io.Reader retrieveArticleInfo(int lowArticleNumber,
                                          int highArticleNumber)
                                   throws java.io.IOException
Return article headers for all articles between lowArticleNumber and highArticleNumber, inclusively.

__retrieveHeader

private java.io.Reader __retrieveHeader(java.lang.String header,
                                        java.lang.String articleRange)
                                 throws java.io.IOException
Private implementation of XHDR functionality. See NNTP.xhdr(java.lang.String, java.lang.String) 55 for legal agument formats. Alternatively, read RFC 1036.

retrieveHeader

public java.io.Reader retrieveHeader(java.lang.String header,
                                     int articleNumber)
                              throws java.io.IOException
Return an article header for a specified post.

retrieveHeader

public java.io.Reader retrieveHeader(java.lang.String header,
                                     int lowArticleNumber,
                                     int highArticleNumber)
                              throws java.io.IOException
Return an article header for all articles between lowArticleNumber and highArticleNumber, inclusively.

Overview  Package   Class  Use  Deprecated  Index 
Home >> All >> org >> apache >> commons >> net >> [ nntp overview ]  PREV CLASS  NEXT CLASS
SUMMARY: JavaDoc of org.apache.commons.net.nntp.NNTPClient JAVADOC | Sourc code of org.apache.commons.net.nntp.NNTPClient SOURCE | Download org.apache.commons.net.nntp.NNTPClient DOWNLOAD | NESTED | FIELD | CONSTR | METHOD DETAIL: FIELD | CONSTR | METHOD