Java 文件io

package test;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;

public class TestOut {
    public static void main(String[] s){
        int b;
        b='a';
        System.out.write(b);
        System.out.write('\n'); //打印的是:'a'
        System.out.print(b); //打印的是:97
//////////////////////////////////////
        
        try {
            InputStream f = new FileInputStream("text2.txt");
            while(true){
            try {
                int i =f.read();
                // 读取的也是二进制
                System.out.println("i == " + i);
                if(i == -1) break;
            } catch (IOException e) {
                e.printStackTrace();
            }
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        
        /*
         * text2.txt的内容:  今天是1221GHAc
         * 打印结果:
         *    i == 228
            i == 187
            i == 138
            i == 229
            i == 164
            i == 169
            i == 230
            i == 152
            i == 175
            i == 49
            i == 50
            i == 50
            i == 49
            i == 71
            i == 72
            i == 65
            i == 99
            i == -1 
         */
        ///////////////////////////////////////////////
        byte bwrite []= {11,21,2,33, 'A', 'a', '$'};
        try {
                OutputStream  os1 =new  FileOutputStream("text3.txt");
            for(int x=0; x<bwrite.length; x++){
                // writes the bytes
                os1.write(bwrite[x]);
            }
            os1.close();
            InputStream in1 = new FileInputStream("text3.txt");
            int size = in1.available();
            for(int k=0; k<size;k++){
                 System.out.print(in1.read() + "  ");
                 //输出结果:11  21  2  33  65  97  36  
            }
            
            for(int k=0; k<size;k++){
                 System.out.print((char)in1.read() + "  ");
                 // 输出结果:      !  A  a  $ 
            }
             System.out.println();
             System.out.print("结束");
        } catch (IOException e) {
            e.printStackTrace();
        }
        
        ////////////////////////////////////////////////
        
        try {
            OutputStream  os =new  FileOutputStream("text2.txt");
                OutputStreamWriter writer =
                        new OutputStreamWriter(os, "UTF-8");
                
                writer.append("中文输入");
                writer.append("\r\n");
                writer.append("english");
                writer.close();
                os.close();
                
                InputStream is = new FileInputStream("text2.txt");
                InputStreamReader reader = new InputStreamReader(is, "UTF-8");
                StringBuffer sbBuffer = new StringBuffer();
                while(reader.ready()){
                    sbBuffer.append((char)reader.read());
                }
                System.out.println("sbBuffer == " + sbBuffer.toString());
                reader.close();
                is.close();
            /*
             *输出结果:
             *sbBuffer == 中文输入
             *(换行)
             *english 
             */
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

 

 

参考:http://www.runoob.com/java/java-files-io.html