Java binary I/O processing

How to handle text I/O in Java

Use the scanner class to read text data and write text data using the PrintWriter class

Example:

 Public classIO { Public Static voidMain (String [] args)throwsFileNotFoundException {//printwriter printwriter = new PrintWriter ("123.txt"); Output Text data//printwriter.print ("Chenzquan");//printwriter.close ();Scanner input =NewScanner (NewFile ("123.txt"));//Enter text dataSystem.out.print (Input.nextline ()); }}

Text I/O needs to be encoded, decoded, and binary I/O is not required, so binary I/O is faster

Binary I/O classes

Methods of the InputStream class

OutputStream class method

FileInputStream and FileOutputStream

FileInputStream classes and FileOutputStream classes for reading/writing bytes from/to files

FileInputStream

FileOutputStream

 Public classTestfilestream { Public Static voidMain (String [] args)throwsFileNotFoundException, IOException {Try(FileOutputStream FileOutputStream =NewFileOutputStream ("Temp.dat"); ){             for(inti=0;i<100; i++) {fileoutputstream.write (i); }        }                Try(FileInputStream FileInputStream =NewFileInputStream ("Temp.dat");){            intvalue;  while((Value=fileinputstream.read ())! =-1) {System.out.print (value+ " "); }        }    }}

DataInputStream and Dataoutputstresam

DataInputStream

Implementing the Datainput Interface

DataOutputStream

Implementing the DataOutput Interface

Creating DataInputStream classes and DataOutputStream classes

Example:

Example:

 Public classTestdatastream { Public Static voidMain (String [] args)throwsFileNotFoundException, IOException {Try(DataOutputStream DataOutputStream =NewDataOutputStream (NewFileOutputStream ("Temp.dat"));) {Dataoutputstream.writeutf ("John"); Dataoutputstream.writedouble (85.5); Dataoutputstream.writeutf ("Chenzquan"); Dataoutputstream.writedouble (100.0); }                Try(DataInputStream DataInputStream =NewDataInputStream (NewFileInputStream ("Temp.dat"));) {System.out.println (Datainputstream.readutf () )+ " " +datainputstream.readdouble ()); System.out.println (Datainputstream.readutf ()+ " " +datainputstream.readdouble ()); }            }}

The DataInputStream class and the DataOutputStream class read and write Java primitive type values and strings in a machine-platform-agnostic way, so one machine writes the data and can read the file on another

Bufferedinputstream class and Bufferedoutputstream class

They can increase the speed of input and output by reducing the number of disk reads and writes

When using Bufferedinputstream, the entire block of data on the disk is read into the in-memory buffer at once, and then the individual data is passed from the buffer to the program

When using Bufferedoutputstream, individual data is written into the buffer, and when the buffer is full, the data of the buffer is written to disk once

Java binary I/O processing