java itext pdf remove text

java itext pdf remove text

java itext pdf remove text

POP, the Post Office Protocol, provides a simple way to download e-mail messages stored on a remote server. With Python s poplib interface, you can obtain information about the number of messages in a mailbox and the size of each message. You can also retrieve or delete individual messages by number. Connecting to a POP server may lock a mailbox. Therefore, it s important to try to keep POP sessions as brief as possible and always call quit() when done. POP should be used with SSL when possible to protect your passwords and e-mail message contents. In the absence of SSL, try to at least use APOP, and send your password in the clear only in dire circumstances where you desperately need to POP and none of the fancier options work. Although POP is a simple and widely deployed protocol, it has a number of drawbacks that make it unsuitable for some applications. For instance, it can access only one folder, and does not provide persistent tracking of individual messages. The next chapter discusses IMAP, a protocol that provides the features of POP with a number of new features as well.

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At first glance, the Internet Message Access Protocol (IMAP) resembles the POP protocol described in 14. And if you have read the first sections of 13, which give the whole picture of how email travels across the Internet, you will already know that the two protocols fill a quite similar role: POP and IMAP are two ways that a laptop or desktop computer can connect to a larger Internet server to view and manipulate a user s e-mail. But there the resemblance ends. Whereas the capabilities of POP are rather anemic the user can download new messages to his or her personal computer the IMAP protocol offers such a full array of capabilities that many users store their e-mail permanently on the server, keeping it safe from a laptop or desktop hard drive crash. Among the advantages that IMAP has over POP are the following: Mail can be sorted into several folders, rather than having to arrive in a single inbox. Flags are supported for each message, like read, replied, seen, and deleted. Messages can be searched for text strings right on the server, without having to download each one. A locally stored message can be uploaded directly to one of the remove folders. Persistent unique message numbers are maintained, making robust synchronization possible between a local message store and the messages kept on the server. Folders can be shared with other users, or marked read-only. Some IMAP servers can present non-mail sources, like Usenet newsgroups, as though they were mail folders. An IMAP client can selectively download one part of a message for example, grabbing a particular attachment, or only the message headers, without having to wait to download the rest of the message.

Now you can SELECT from names and ask the database to JOIN the tables names and salaries ON the id columns. This is expressed in SQL as follows: SELECT names.firstname, names.lastname, salaries.annual FROM names JOIN salaries ON names.id = salaries.id The result from this statement is shown as follows (the rows not represented in both tables are left out):

These features, taken together, mean that IMAP can be used for many more operations than the simple download-and-delete spasm that POP supports. Many mail readers, like Thunderbird and Outlook, can present IMAP folders so they operate with the same capabilities of locally stored folders. When a user clicks a message, the mail reader downloads it from the IMAP server and displays it, instead of having to download all of the messages in advance; the reader can also set the message s read flag at the same time.

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To say that XML is an important part of how data is used in mashups is an understatement. XML seems to be the foundation for everything these days. XML is not the data itself but a way to represent the data using elements to provide structure, in the same way HTML does. The difference between HTML and XML is that with XML you can create your own custom elements to represent data in any way you want, whereas HTML is just for marking up web pages. XML s primary purpose is to facilitate the sharing of data across different information systems, particularly via the Internet.

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