TheCodersCorner.com items tagged with file-handling.
Message based communication using sockets.
Using sockets for client / server development Following on from Using sockets for a character based stream we now introduce the idea of messaging. When we need to send commands between two systems (often referred to as client and server) we normally use message based communication, this was briefly discussed in the data communications introduction. For this example we will...
Using sockets for a character based stream
Following on from the article Introduction to data communications we will now go into more depth, by looking at an example of stream based communication. We will use sockets for the example; mainly because sockets are available out of the box on any computer connected to the internet. A socket is a stream based connection between a server and a...
Data communications by example for developers
In this section I discuss communication protocols; we start with a grounding on the basics and move through to some worked examples. To start with let’s look at some of the simplest cases and understand how communications between computer systems work in practise. There are many methods of communicating between two computers, be they embedded, mobile, desktop or server. Protocols range...
Filtered extraction from zip file using ZipInputStream and Java 8
In the example below we build on the Reading a zip file from java using ZipInputStream page to provide basic filtering. This filtering is provided by the filteredExpandZipFile method taking a Predicate. Every ZipEntry is passed to the predicate, but only ones that match (predicate returns true) are included. Note that the size of an entry cannot be accurately determined in...
Writing a zip file in java using ZipOutputStream.
Following on from one of our popular articles on Reading a zip file from java using ZipInputStream we've put together a new article on how to create a zip archive using Java. The below example uses ZipOutputStream to create a zip file from all the items in a directory. Zip files are written slightly differently to a normal stream in that...
Using Java's XMLStreamReader PULL XML Parser
In this entry I show how to use the inbuilt Java XMLStreamReader PULL parser class to read an XML file. The XML stream libraries are PULL based XML parsers that do not load the whole document into a memory structure, so therefore are more suited to large volumes of XML. Below is an example XML file for a zoo, it contains...
Watching files in Java 7 with WatchService
In this article I show how to watch files and directories for additions/changes/deletions using the new file system support in Java 7. Finally, after years of native solutions, it is now possible to listen for file changes without resorting to OS specific solutions. In the code below, first we use the new file system support class to get a ...
NIO File operations in Java 7
Hot on the heals of the last article, interested in what other goodies may be in the new file IO package, and wanting to try the new catch block, I cooked up another example. In this example, I create a Path object for an example directory, into which I then create a file and write some text into the file. Some...
Write XML with GroovyBuilder
Groovy supports the concept of builders, which provide an abstraction between the required output content and the representation of it. Groovy supports this by providing a tree like structure in groovy code that represents the required HTML or XML: So what have we done? We generated some HTML, in this case we just printed it to the console, but we could...
Reading XML in groovy using XmlParser
Groovy has great inbuilt xml support, and allows you to treat xml paths like objects. Reading elements and attributes is so straightforward that it was one of the factors that got me started with Groovy. So to build an object tree from xml, we just use the class. To dereference an element we use normal dot syntax, for an attribute,...
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