Java I/0 Examples

1. What is Java I/O?
   The Java I/O means Java Input/Output. It is provided by the java.io package. This package has an InputStream and OutputStream. Java InputStream is defined for reading the stream, byte stream and array of byte stream.
   
2. Classes and Interfaces of the I/O Streams
   The following listing of classes provided by the java.io package shown in the given table.
      
3. Reading Text from the Standard Input 
   Java provides the standard I/O facilities for reading text through either from the file or from the keyboard on command line. This program illustrates how to use standard input to read the user input.
   
4. Working With the Files
   The File class deals with the machine dependent files in a machine-independent manner i.e. it is easier to write platform-independent code that examines and manipulates files using the File class. This class is available in the java.lang package.
   
   • Create a File 
   • Constructing a File Name path
   • Read the File
   • Write to a File
   • Appending to a File
   • Getting the Size of a File
   • Count lines of a particular file
   • Renaming a File or Directory
   • Copying a File to Another File
   • Copying Multiple Files 
   • Moving a File or Directory to Another Directory
   • Deleting a File or Directory
   • Change a File timestamp
   • Create a Temp File
   • Delete a Temp File   
   • Getting an absolute path and Parents of a Filename
     
     
5. Working with a Directory
   In the section, you will learn how a directory is created. Apart from this, you will also be aware from some manipulations that are performed 
   on a directory.
   
   • Creating a Directory
   • Copying a Directory or file
   • Traversing files and directories
   • Getting the Current Working Directory
   • Getting the Modification Time of a File or Directory
   • Listing Files or Subdirectories 
   • Deleting a File
   
   
6. Filter I/O Streams
   Like I/O streams, Filter streams are also used to manipulate the data reading from an underlying stream.. Apart from this, it allows the user to make a chain using multiple input stream so that, the operations that are to be applied on this chain, may create a combine effects on several filters. 
• Introduction 
• Write to a file
• Read the file
• Another Streams
  
  
7. Overview of I/O Data Streams
   Data streams are filtered streams that perform binary I/O operation on primitive data type values ( boolean, char, byte, short, int, long, etc.) as well as on String values. If you need to work with data that is not represented as bytes or characters then you can use Data Streams.
   
• Working with PrintStream
  
  
8. Using a Random Access File
   n this section, you will learn about the Random Access File class provided by java. io package. This is a class that allows you to read and write arbitrary bytes, text, and primitive Java data types from or to any specified location in a file. 
      
9. Converting a Filename Path to a URL
   In this section, you will learn, how a Filename path is converted to a URL and vice versa . URL stands for Uniform Resource Locator.
                       
10. Making Tokens of a Java Source Code
    In Java, The StreamTokenizer class is used for simple parsing of a Java source file into tokens. This class takes an input stream, breaks up the ASCII text in a file and parses it into "tokens". It allows the tokens to be read one at a time.
        
11. Introduction to Encoding
    Java programs use Unicode text internally. It supports standard UTF-8 when reading and writing strings through the InputStreamReader and the OutputStreamWriter.
 
• Reading UTF-8 Encoded Data
• Writing UTF-8 Encoded Data
• Reading ISO Latin-1 Encoded Data
• Writing ISO Latin-1 Encoded Data
    
12. Serializing an Object
    Serialization is the process of saving an object in a storage medium (such as a file, or a memory buffer) or to transmit it over a network connection in binary form.
      
13. Deserializing an Object
    The opposite operation of the serialization is called deserialization i.e. to extracting the data from a series of bytes is s known as deserialization
                                                                
14. Delete file or Directory
    In this example we are discussing the deletion of a file or a directory by using a java program. We pass the file name or the directory name to which we want to delete.
                                                               
15. Downloading and Viewing html source of a page i.e. running on the server
    This section illustrates you the procedure of viewing complete html code of a page i.e. running on the server.
             
16. URL file Download and Save in the Local Directory
    This Program file download  from  URL and save this Url File in the specified directory. This program specifies the directory path where the files to be stored  as first command line argument and second command line arguments specifies URL File to be stored.
                
17. Create XML file from flat file and data insert into database
    In this section, we have developed an application to create xml file from flat file and data insert  into database in Java. 
                        

18. Miscellaneous 

• Compressing Streams

• Zip File

• Zip Folder

• Unzip File 

• Code for Garbage Collection