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java.lang.Object org.apache.commons.net.SocketClient org.apache.commons.net.pop3.POP3 org.apache.commons.net.pop3.POP3Client
public class POP3Client
The POP3Client class implements the client side of the Internet POP3 Protocol defined in RFC 1939. All commands are supported, including the APOP command which requires MD5 encryption. See RFC 1939 for more details on the POP3 protocol.
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
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.
POP3MessageInfo
,
DotTerminatedMessageReader
,
MalformedServerReplyException
Field Summary |
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Fields inherited from class org.apache.commons.net.pop3.POP3 |
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_commandSupport_, AUTHORIZATION_STATE, DEFAULT_PORT, DISCONNECTED_STATE, TRANSACTION_STATE, UPDATE_STATE |
Fields inherited from class org.apache.commons.net.SocketClient |
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_defaultPort_, _input_, _output_, _serverSocketFactory_, _socket_, _socketFactory_, _timeout_, connectTimeout, NETASCII_EOL |
Constructor Summary | |
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POP3Client()
|
Method Summary | |
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boolean |
capa()
Send a CAPA command to the POP3 server. |
boolean |
deleteMessage(int messageId)
Delete a message from the POP3 server. |
POP3MessageInfo |
listMessage(int messageId)
List an individual message. |
POP3MessageInfo[] |
listMessages()
List all messages. |
POP3MessageInfo |
listUniqueIdentifier(int messageId)
List the unique identifier for a message. |
POP3MessageInfo[] |
listUniqueIdentifiers()
List the unique identifiers for all messages. |
boolean |
login(String username,
String password)
Login to the POP3 server with the given username and password. |
boolean |
login(String username,
String timestamp,
String secret)
Login to the POP3 server with the given username and authentication information. |
boolean |
logout()
Logout of the POP3 server. |
boolean |
noop()
Send a NOOP command to the POP3 server. |
boolean |
reset()
Reset the POP3 session. |
Reader |
retrieveMessage(int messageId)
Retrieve a message from the POP3 server. |
Reader |
retrieveMessageTop(int messageId,
int numLines)
Retrieve only the specified top number of lines of a message from the POP3 server. |
POP3MessageInfo |
status()
Get the mailbox status. |
Methods inherited from class org.apache.commons.net.pop3.POP3 |
---|
_connectAction_, disconnect, getAdditionalReply, getCommandSupport, getReplyString, getReplyStrings, getState, removeProtocolCommandistener, sendCommand, sendCommand, sendCommand, sendCommand, setState |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
---|
public POP3Client()
Method Detail |
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public boolean capa() throws IOException
IOException
- If a network I/O error occurs in the process of
sending the CAPA command.public boolean login(String username, String password) throws IOException
connect
before attempting to login. A login attempt is only valid if
the client is in the
AUTHORIZATION_STATE
. After logging in, the client enters the
TRANSACTION_STATE
.
username
- The account name being logged in to.password
- The plain text password of the account.
IOException
- If a network I/O error occurs in the process of
logging in.public boolean login(String username, String timestamp, String secret) throws IOException, NoSuchAlgorithmException
getReplyString
and parse out the timestamp information yourself.
You must first connect to the server with
connect
before attempting to login. A login attempt is only valid if
the client is in the
AUTHORIZATION_STATE
. After logging in, the client enters the
TRANSACTION_STATE
. After connecting, you must parse out the
server specific information to use as a timestamp, and pass that
information to this method. The secret is a shared secret known
to you and the server. See RFC 1939 for more details regarding
the APOP command.
username
- The account name being logged in to.timestamp
- The timestamp string to combine with the secret.secret
- The shared secret which produces the MD5 digest when
combined with the timestamp.
IOException
- If a network I/O error occurs in the process of
logging in.
NoSuchAlgorithmException
- If the MD5 encryption algorithm
cannot be instantiated by the Java runtime system.public boolean logout() throws IOException
disconnect
.
A logout attempt is valid in any state. If
the client is in the
TRANSACTION_STATE
, it enters the
UPDATE_STATE
on a successful logout.
IOException
- If a network I/O error occurs in the process
of logging out.public boolean noop() throws IOException
TRANSACTION_STATE
.
IOException
- If a network I/O error occurs in the process of
sending the NOOP command.public boolean deleteMessage(int messageId) throws IOException
reset
command. Messages marked
for deletion are only deleted by the server on
logout
.
A delete attempt can only succeed if the client is in the
TRANSACTION_STATE
.
messageId
- The message number to delete.
IOException
- If a network I/O error occurs in the process of
sending the delete command.public boolean reset() throws IOException
TRANSACTION_STATE
.
IOException
- If a network I/O error occurs in the process of
sending the reset command.public POP3MessageInfo status() throws IOException
TRANSACTION_STATE
. Returns a POP3MessageInfo instance
containing the number of messages in the mailbox and the total
size of the messages in bytes. Returns null if the status the
attempt fails.
IOException
- If a network I/O error occurs in the process of
sending the status command.public POP3MessageInfo listMessage(int messageId) throws IOException
TRANSACTION_STATE
. Returns a POP3MessageInfo instance
containing the number of the listed message and the
size of the message in bytes. Returns null if the list
attempt fails (e.g., if the specified message number does
not exist).
messageId
- The number of the message list.
IOException
- If a network I/O error occurs in the process of
sending the list command.public POP3MessageInfo[] listMessages() throws IOException
TRANSACTION_STATE
. Returns an array of POP3MessageInfo instances,
each containing the number of a message and its size in bytes.
If there are no messages, this method returns a zero length array.
If the list attempt fails, it returns null.
IOException
- If a network I/O error occurs in the process of
sending the list command.public POP3MessageInfo listUniqueIdentifier(int messageId) throws IOException
TRANSACTION_STATE
. Returns a POP3MessageInfo instance
containing the number of the listed message and the
unique identifier for that message. Returns null if the list
attempt fails (e.g., if the specified message number does
not exist).
messageId
- The number of the message list.
IOException
- If a network I/O error occurs in the process of
sending the list unique identifier command.public POP3MessageInfo[] listUniqueIdentifiers() throws IOException
TRANSACTION_STATE
. Returns an array of POP3MessageInfo instances,
each containing the number of a message and its unique identifier.
If there are no messages, this method returns a zero length array.
If the list attempt fails, it returns null.
IOException
- If a network I/O error occurs in the process of
sending the list unique identifier command.public Reader retrieveMessage(int messageId) throws IOException
TRANSACTION_STATE
You must not issue any commands to the POP3 server (i.e., call any other methods) until you finish reading the message from the returned BufferedReader instance. The POP3 protocol uses the same stream for issuing commands as it does for returning results. Therefore the returned BufferedReader actually reads directly from the POP3 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.
messageId
- The number of the message to fetch.
BufferedReader
in order to
use the BufferedReader#readLine()
method.
Returns null if the retrieval attempt fails (e.g., if the specified
message number does not exist).
IOException
- If a network I/O error occurs in the process of
sending the retrieve message command.public Reader retrieveMessageTop(int messageId, int numLines) throws IOException
TRANSACTION_STATE
You must not issue any commands to the POP3 server (i.e., call any other methods) until you finish reading the message from the returned BufferedReader instance. The POP3 protocol uses the same stream for issuing commands as it does for returning results. Therefore the returned BufferedReader actually reads directly from the POP3 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.
messageId
- The number of the message to fetch.numLines
- The top number of lines to fetch. This must be >= 0.
BufferedReader
in order to
use the BufferedReader#readLine()
method.
Returns null if the retrieval attempt fails (e.g., if the specified
message number does not exist).
IOException
- If a network I/O error occurs in the process of
sending the top command.
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