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几种常用输出输出流的使用

王朝other·作者佚名  2008-05-31
窄屏简体版  字體: |||超大  

// : c12:IOStreamDemo.Java

// Typical I/O stream configurations.

// {RunByHand}

// {Clean: IODemo.out,Data.txt,rtest.dat}

// From 'Thinking in Java, 3rd ed.' (c) BrUCe Eckel 2002

// www.BruceEckel.com. See copyright notice in CopyRight.txt.

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.ByteArrayInputStream;

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.EOFException;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.PrintWriter;

import java.io.RandomAccessFile;

import java.io.StringReader;

public class IOStreamDemo {

// Throw exceptions to console:

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

// 1. Reading input by lines:

BufferedReader in = new BufferedReader(new FileReader(

"IOStreamDemo.java"));

String s, s2 = new String();

while ((s = in.readLine()) != null)

s2 += s + "\n";

in.close();

// 1b. Reading standard input:

BufferedReader stdin = new BufferedReader(new InputStreamReader(

System.in));

System.out.print("Enter a line:");

System.out.println(stdin.readLine());

// 2. Input from memory

StringReader in2 = new StringReader(s2);

int c;

while ((c = in2.read()) != -1)

System.out.print((char) c);

// 3. Formatted memory input

try {

DataInputStream in3 = new DataInputStream(new ByteArrayInputStream(

s2.getBytes()));

while (true)

System.out.print((char) in3.readByte());

} catch (EOFException e) {

System.err.println("End of stream");

}

// 4. File output

try {

BufferedReader in4 = new BufferedReader(new StringReader(s2));

PrintWriter out1 = new PrintWriter(new BufferedWriter(

new FileWriter("IODemo.out")));

int lineCount = 1;

while ((s = in4.readLine()) != null)

out1.println(lineCount++ + ": " + s);

out1.close();

} catch (EOFException e) {

System.err.println("End of stream");

}

// 5. Storing & recovering data

try {

DataOutputStream out2 = new DataOutputStream(

new BufferedOutputStream(new FileOutputStream("Data.txt")));

out2.writeDouble(3.14159);

out2.writeUTF("That was pi");

out2.writeDouble(1.41413);

out2.writeUTF("Square root of 2");

out2.close();

DataInputStream in5 = new DataInputStream(new BufferedInputStream(

new FileInputStream("Data.txt")));

// Must use DataInputStream for data:

System.out.println(in5.readDouble());

// Only readUTF() will recover the

// Java-UTF String properly:

System.out.println(in5.readUTF());

// Read the following double and String:

System.out.println(in5.readDouble());

System.out.println(in5.readUTF());

} catch (EOFException e) {

throw new RuntimeException(e);

}

// 6. Reading/writing random access files

RandomAccessFile rf = new RandomAccessFile("rtest.dat", "rw");

for (int i = 0; i < 10; i++)

rf.writeDouble(i * 1.414);

rf.close();

rf = new RandomAccessFile("rtest.dat", "rw");

rf.seek(5 * 8);

rf.writeDouble(47.0001);

rf.close();

rf = new RandomAccessFile("rtest.dat", "r");

for (int i = 0; i < 10; i++)

System.out.println("Value " + i + ": " + rf.readDouble());

rf.close();

}

} ///:~

 
 
 
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