Java IO Demo

FileReader FileWriter Read and write English
public void FileReaderAndWriter1 () throws Exception {

File FilePath = new file ("E:/iotest");
if (!filepath.exists ()) {
Filepath.mkdirs ();
}

Write a file
File File = new file (Filepath.getpath (), "writer.txt");
FileWriter writer = new FileWriter (file);


for (int i = 0; i <; i++) {
Writer.write (New char[]{' A ', ' B ', ' C '});
Writer.write (new char[]{' \ R ', ' \ n '});
}
Writer.close ();

Read file
FileReader reader = new FileReader (file);
Char[] Chars=new char[100];
int readcount = 0;
while ((Readcount=reader.read (chars)) >0) {
System.out.print (string.valueof (chars) substring (0, readcount));
}
Reader.close ();
}
FileReader FileWriter Read/write Chinese
public void FileReaderAndWriter2 () throws Exception {

File FilePath = new file ("E:/iotest");
if (!filepath.exists ()) {
Filepath.mkdirs ();
}

Write a file
File File = new file (Filepath.getpath (), "writer.txt");
FileWriter writer = new FileWriter (file);
BufferedWriter bfwriter = new BufferedWriter (writer);

for (int i = 0; i < 10000; i++) {
Bfwriter.write ("Current line number" + i);
Bfwriter.write ("\ r \ n");
}
Bfwriter.flush ();
Writer.close ();
Bfwriter.close ();

Read file
FileReader reader = new FileReader (file);
BufferedReader bfreader =new BufferedReader (reader);
String line= "";
while ((Line=bfreader.readline ())!=null) {
System.out.println (line);
}

}

FileInputStream FileOutputStream
public void FileStream () throws exception{
File file1 =new file ("E:/iotest", "writer.txt");
FileInputStream input =new FileInputStream (file1);
Bufferedinputstream binput =new bufferedinputstream (input);

File file2 =new file ("E:/iotest", "writer1.txt");
FileOutputStream output = new FileOutputStream (file2);
Bufferedoutputstream boutput =new bufferedoutputstream (output);
byte [] b=new byte[1024];
int bcount;

while ((Bcount=binput.read (b)) >0) {
Boutput.write (b, 0, bcount);
}
Boutput.flush ();
Boutput.close ();
Binput.close ();

}

Bitarrayinputstream Bitarrayoutputstream
public void Bitstream () throws exception{
byte [] binput =new byte[]{12,-1,127,-128,0};

Bytearrayinputstream input = new Bytearrayinputstream (binput);
int i;
while ((i = Input.read ())!=-1) {
System.out.println (i);
}

Bytearrayoutputstream output = new Bytearrayoutputstream ();
Output.write (New byte[]{67,97,1});
String strout = output.tostring ();
System.out.println (Strout);
}

CharArrayReader Chararraywriter
public void Charstream () throws exception{
CharArrayReader Reader =new CharArrayReader (new char[]{' A ', ' B ', ' C '});
int i;
while ((I=reader.read ())!=-1) {
System.out.println (i);
}

Chararraywriter writer = new Chararraywriter ();
Writer.write ("Shanghai");
Char [] cbuf =new char[]{' A ', ' B ', ' C ', ' a '};
Writer.write (CBUF);

File File = new file ("E:/iotest/char.txt");
FileWriter FW = new FileWriter (file);

Writer.writeto (FW);

Writer.flush ();
Fw.flush ();

}

Objectstream
public void Objectstream () throws exception{

FileOutputStream fos = new FileOutputStream ("E:/iotest/object.txt");
ObjectOutputStream oos = new ObjectOutputStream (FOS);

Oos.writedouble (10.2);
Oos.writefloat (16.323f);
Oos.writechars ("China");

Student Stu =new Student (1, "CWG", New Date ());

Oos.writeobject (Stu);
Oos.flush ();
Oos.close ();

FileInputStream fis =new fileinputstream ("E:/iotest/object.txt");
ObjectInputStream ois = new ObjectInputStream (FIS);
System.out.println (Ois.readdouble ());
System.out.println (Ois.readfloat ());
System.out.println (Ois.readchar ());
System.out.println (Ois.readchar ());
Object obj = Ois.readobject ();
if (obj instanceof Student) {
Student Rstu = (Student) obj;
System.out.println (Rstu.getid () + "--" +rstu.getusername ());
}

}

public static void Main (string[] args) throws Exception {
Iodemo demo = new Iodemo ();
Demo. FileReaderAndWriter1 ();
Demo. FileReaderAndWriter2 ();
Demo. FileStream ();
Demo. Bitstream ();
Demo. Charstream ();
Demo. Objectstream ();

}

Java IO Demo