An example of IO in Java

character Stream

Package jd_1;

Import Java.io.BufferedReader;
Import Java.io.BufferedWriter;
Import java.io.FileNotFoundException;
Import Java.io.FileReader;
Import Java.io.FileWriter;
Import java.io.IOException;

public class Jd_1 {

/**
* Character Stream
*
* @param args
*/
public static void Main (string[] args) {
Create BufferedReader for reading files
BufferedReader reader = null;
Create bufferedwriter for writing files
BufferedWriter writer = null;
Create FileReader to save read-in paths
FileReader FIS = null;
try {
FIS = new FileReader ("F:\\java io\\ simple Copy\\source.txt");
} catch (FileNotFoundException e) {
TODO auto-generated Catch block
E.printstacktrace ();
}
Create FileWriter to save the write path
FileWriter FW = NULL;
try {
FW = new FileWriter ("F:\\java io\\ simple Copy\\targetcopy.txt");
} catch (IOException e) {
TODO auto-generated Catch block
E.printstacktrace ();
}
reader = new BufferedReader (FIS);
writer = new BufferedWriter (FW);
String line = null;
Reading is a string
try {
while (line = Reader.readline ()) = null) {
try {
Thread.Sleep (500);
} catch (Interruptedexception e) {
TODO auto-generated Catch block
E.printstacktrace ();
// }
Writer.write (line);
// }
Use an array as a broker
Char[] C = new char[1024];
StringBuffer buffer = new StringBuffer ();
int legin = Fis.read (c);
while (legin! =-1) {
Buffer.append (c);
Legin = Fis.read ();
Fw.write (c);
}
} catch (Exception e) {
TODO auto-generated Catch block
E.printstacktrace ();
} finally {
System.err.println ("copy succeeded");
if (reader! = null) {
try {
Reader.close ();
} catch (IOException e) {
TODO auto-generated Catch block
E.printstacktrace ();
}
}
if (writer! = null) {
try {
Writer.close ();
} catch (IOException e) {
TODO auto-generated Catch block
E.printstacktrace ();
}
}
}
}
}

BYTE stream

public class Copy {
public static void Main (string[] args) {
Before copying
FileInputStream file = null;
After copying
FileOutputStream file1 = null;
try {
The path before the copy
File = new FileInputStream ("F:\\java io\\ new text document. txt");
The path after the copy
File1 = new FileOutputStream ("F:\\java io\\copy.txt");
} catch (FileNotFoundException e) {
TODO auto-generated Catch block
E.printstacktrace ();
}
Create an array of characters as a broker
byte[] Words = new byte[1024];
Record the length of an array
int Len;
try {
while (len = File.read (Words))! =-1) {
File1.write (Words, 0, words.length);
System.out.println ("copy succeeded");
}
} catch (IOException e) {

E.printstacktrace ();
} finally {
if (file! = null) {
try {
File.close ();
} catch (IOException e) {
TODO auto-generated Catch block
E.printstacktrace ();
}
}
if (file1! = null) {
try {
File1.close ();
} catch (IOException e) {
TODO auto-generated Catch block
E.printstacktrace ();
}
}
}
}
}

Binary stream

Package bdqn4;

Import Java.io.DataInputStream;
Import Java.io.DataOutputStream;
Import Java.io.FileInputStream;
Import java.io.FileNotFoundException;
Import Java.io.FileOutputStream;
Import java.io.IOException;

/**
* Binary Read
*
* @author Administrator
*
*/
public class Text {
public static void Main (string[] args) {
Create a Stream
Implementing Read and Write operations
Close the stream

DataInputStream dis = null;
DataOutputStream dos = null;

FileInputStream FIS = null;
try {
FIS = new FileInputStream ("F:\\java io\\ original picture. jpg");
} catch (FileNotFoundException E1) {
TODO auto-generated Catch block
E1.printstacktrace ();
}
FileOutputStream fos = null;
try {
FOS = new FileOutputStream ("F:\\java io\\copy picture \\copy.jpg");
} catch (FileNotFoundException e) {
TODO auto-generated Catch block
E.printstacktrace ();
}
dis = new DataInputStream (FIS);
DOS = new DataOutputStream (FOS);
int temp;
try {
while (temp = Dis.read ())! =-1) {
Dos.write (temp);
}
} catch (IOException e) {
TODO auto-generated Catch block
E.printstacktrace ();
} finally {
SYSTEM.ERR.PRINTLN ("transfer success");
if (dis! = null) {
try {
Dis.close ();
} catch (IOException e) {
TODO auto-generated Catch block
E.printstacktrace ();
}
}
if (dos = null) {
try {
Dos.close ();
} catch (IOException e) {
TODO auto-generated Catch block
E.printstacktrace ();
}
}
}
}
}

Determine the various properties and methods of IO

Package bdqn1;

Import Java.io.File;
Import java.io.IOException;
Import Java.util.Scanner;

public class Text {
public static void Main (string[] args) {
Scanner input = new Scanner (system.in);
Instantiating objects pointing to determine the path
File File = new file ("F:\\java io\\ new text document. txt");
Determine if the TET exists.
if (file.exists ()) {
System.out.println ("Current file exists");
SYSTEM.OUT.PRINTLN ("Full path to File" + File.getabsolutepath ());
SYSTEM.OUT.PRINTLN ("filename" + file.getname ());
SYSTEM.OUT.PRINTLN ("Relative path to file" + File.getpath ());
SYSTEM.OUT.PRINTLN ("Top level directory of files" + file.getparent ());
System.out.println ("Length of File" + file.length ());
if (File.isdirectory ()) {
System.out.println ("Current is a folder");
} else {
System.out.println ("Current is not a folder");
System.err.println ("Please enter 1 to delete");
int number = Input.nextint ();
if (number = = 1) {
boolean bool = File.delete ();
if (bool) {
System.out.println ("delete succeeded");
}
}
}
} else {
System.out.println ("Current file does not exist");
try {
boolean bool = File.createnewfile ();
if (bool) {
SYSTEM.OUT.PRINTLN ("created successfully");
}
} catch (IOException e) {
TODO auto-generated Catch block
E.printstacktrace ();
}
}
}
}

An example of IO in Java