Java input/output stream memo

Important Blog:

http://blog.csdn.net/hguisu/article/details/7418161

1. File dir = new file ("\\root"); Directory
2. File F1 = new file (dir, "FileOne.txt"); File

Dir.mkdir ();//Create Directory

F1.createnewfile ();//Create File

All classes required for streaming I/O are included in the Java.io package. There are four basic classes in the Java.io package: InputStream, OutputStream, and reader, and writer classes that handle byte streams and character streams, respectively:

Commonly used are Bufferedinputstream and Bufferedoutputstream (buffering), FileReader and FileWriter.

5. Application of FileInputStream flow and FileOutputStream

Use the program to copy the file File1.txt to File2.txt.

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Import Java.io.File;

Import java.io.IOException;

Import Java.io.FileOutputStream;

Import Java.io.FileInputStream;

public class Testfile {

public static void Main (String args[]) throws IOException {

try {

File InFile = new file ("Copy.java");

File OutFile = new file ("Copy2.java");

FileInputStream FinS = new FileInputStream (inFile);

FileOutputStream Fouts = new FileOutputStream (outFile);

int C;

while ((c = Fins.read ())! =-1) {

Fouts.write (c);

}

Fins.close ();

Fouts.close ();

} catch (IOException e) {

System.err.println ("Filestreamstest:" + e);

}

}

}

3 ) keyboard input stream read to memory

Connect BufferedReader with standard data streams

InputStreamReader sin=new InputStreamReader (system.in);

BufferedReader bin=new BufferedReader (sin);

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2. import java.io.*;
6. Public class Readwritetofile {
8. Public Static void Main (String args[]) throws IOException {
10. InputStreamReader sin = new inputstreamreader (system.in);
12. BufferedReader bin = new bufferedreader (sin);
14. FileWriter out = new FileWriter ("MyFile.txt");
16. BufferedWriter bout = new bufferedwriter (out);
18. String s;
20. (s = Bin.readline ()). Length () > 0) {
22. Bout.write (S, 0, s.length ());
24. 12.}
26. 13.
28. 14.}

15.}

Program Description:
Read the characters from the keyboard and write to the method of the BufferedReader class in the file: String readLine ()
Function: Reads a line of string, ending with a carriage return.
Methods of the BufferedWriter class: Bout.write (Strings,offset,len)
Function: Writes the string s from offset to the Len length string from the buffer to somewhere.

Java input/output stream memo