Understanding Input Output Streams Java IO Basics Your Questions on Java Example

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Tags/Keywords : Understanding-Input-Output-Streams - Java-IO-Basics - Your-Questions-on-Java Example
Author : Amit
Date (Year/Month/Date): 2009-01-31 Understanding input/output streams in Java Technology, with some sample code/example Input streams originates from a source. Source can be a static in content like a file a URL, or source can be another stream. This means streams can have many different sections/smaller streams, originating from a source and ending at a target/destination. Various class from Java api can be used to construct input/output stream for many different needs/context, such as reading/writing file, reading/writing HTTP request/ response reading/writing zipped content, within memory and in filesystem. There can be streams for reading/writing portion of memory /data in byte array form. Let us take each of these example one by one: 1. In case of reading a file to get hold of the data that is comming in form of stream. FileInputStream fin = new FileInputStream(fileName) And taking this file input stream and attaching a data input stream to it makes a stream of data from stream of file. DatainputStream din = new DatainputStream(file_input_stream); In this case we can say that file input stream is low level detailing of file related stream handling. Whereas DatainputStream is at one level higher abstraction, that is representing data stream. So data input stream can be used for other types of input streams, like ServletInputStream etc. Once a particular type of stream is all set, then data stream can be used for reading/ writing data. There are other form of Input Stream like ServletInputStream. In this case, HTTP Request, is intercepted by Servlet and then after completion of service method, Servlet is prepared/ ready to serve input request. Basically, in either doGet or doPost method , an input stream can be constructed from the HttpServletRequest object. So in this case ServletInputStream's source is the stream comming from the browser in form of HTTP Request. Similarly for HttpServletRequest, there could be a ServletOutputStream, which can be attached to the response that is going to the user browser that initially originated the HTTP Request.

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