Java/File Input Output/InputStreamReader
Содержание
Create BufferedReader from InputStreamReader
<source lang="java">
/*
* Copyright (c) 1995 - 2008 Sun Microsystems, Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * - Neither the name of Sun Microsystems nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; public class Standard {
public static void main(String args[]) throws IOException { BufferedReader cin = new BufferedReader(new InputStreamReader(System.in)); String number; int total = 0; while ((number = cin.readLine()) != null) { try { total += Integer.parseInt(number); } catch (NumberFormatException e) { System.err.println("Invalid number in input"); System.exit(1); } } System.out.println(total); }
}
</source>
Create BufferedReader from InputStreamReader and read line by line
<source lang="java">
import java.io.BufferedReader; import java.io.InputStreamReader; class ReadConsole {
public static void main(String args[]) throws Exception { InputStreamReader isr = new InputStreamReader(System.in); BufferedReader br = new BufferedReader(isr); String s; while ((s = br.readLine()) != null) { System.out.println(s.length()); } isr.close(); }
}
</source>
Create BufferedReader from InputStreamReader and URL
<source lang="java">
import java.io.BufferedReader; import java.io.InputStreamReader; import java.net.URL; public class Main {
public static void main(String[] args) throws Exception { URL myURL = new URL("http://www.google.ru"); BufferedReader so = new BufferedReader(new InputStreamReader(myURL.openStream())); while (true) { String output = so.readLine(); if (output != null) { System.out.println(output); } else { break; } } so.close(); }
}
</source>
Deal with Keyboard Input with BufferedReader
<source lang="java">
import java.io.BufferedReader; import java.io.InputStreamReader; public class Main {
public static void main(String[] argv) throws Exception { System.out.print("Enter your name: "); InputStreamReader reader = new InputStreamReader(System.in); BufferedReader in = new BufferedReader(reader); String name = in.readLine(); System.out.println("Hello, " + name + ". Enter three ints..."); int[] values = new int[3]; double sum = 0.0; for (int i = 0; i < values.length; i++) { System.out.print("Number " + (i + 1) + ": "); String temp = in.readLine(); values[i] = Integer.parseInt(temp); sum += values[i]; } System.out.println("The average equals " + sum / values.length); }
}
</source>
Reading ISO Latin-1 Encoded Data
<source lang="java">
import java.io.BufferedReader; import java.io.FileInputStream; import java.io.InputStreamReader; public class Main {
public static void main(String[] argv) throws Exception { BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream("infilename"), "8859_1")); String str = in.readLine(); System.out.println(str); }
}
</source>