java io读写简单实例

java io读写简单实例

package com.za;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
 
/**
 * This program demonstrates how to read characters from a text file.
 * @author www.codejava.net
 *
 */
public class TextFileReadingDemo {
 
    public static void main(String[] args) {
//        textFileRead1();
//    	textFileRead2();
//    	textFileRead3();
//    	writeText2File();
    	bufferWriterText2();
    	textFileRead3();
    }
    
	public static void textFileRead1() {
		try {
            FileReader reader = new FileReader("MyFile.txt");
            int character;            
 
            while ((character = reader.read()) != -1) {
                System.out.print((char) character);
            }
            reader.close();
 
        } catch (IOException e) {
            e.printStackTrace();
        }
	}
    
    public static void textFileRead2() {
    	try {
            FileInputStream inputStream = new FileInputStream("MyFile.txt");
            InputStreamReader reader = new InputStreamReader(inputStream);
            int character;
 
            while ((character = reader.read()) != -1) {
                System.out.print((char) character);
            }
            reader.close();
 
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    
    public static void textFileRead3() {
    	try {
            FileReader reader = new FileReader("MyFile.txt");
            BufferedReader bufferedReader = new BufferedReader(reader);
 
            String line; 
            while ((line = bufferedReader.readLine()) != null) {
                System.out.println(line);
            }
            reader.close();
 
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    public static void writeText2File() {
    	try {
            FileWriter writer = new FileWriter("MyFile.txt", true);
            writer.write("Hello Worldrrrrrrrrrrrrrrrrrrrrrrrrrr");
            writer.write("\r\n");   // write new line
            writer.write("Good Bye!");
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    
    public static void bufferWriterText2() {
    	 try {
             FileWriter writer = new FileWriter("MyFile.txt", true);
             BufferedWriter bufferedWriter = new BufferedWriter(writer);
  
             bufferedWriter.write("Hello World,See You Again!See You Again!See You Again!See You Again!");
             bufferedWriter.newLine();
             bufferedWriter.write("See You Again!");
  
             bufferedWriter.close();
         } catch (IOException e) {
             e.printStackTrace();
         }
    }
}

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