字节流输入输出代码

一、将数据读出来显示到console内： 
代码如下： 
package InputStream;

import java.io.BufferedReader; 
import java.io.BufferedWriter; 
import java.io.FileReader; 
import java.io.IOException; 
import java.io.OutputStream; 
import java.io.OutputStreamWriter; 
import java.io.Writer;

public class OutputStreamWriterDemo { 
public static void main(String[] args) throws IOException { 
//创建输入流对象 
BufferedReader br = new BufferedReader(new FileReader(“copy.txt”));

    //method1(br);

    //创建输出流对象
    Writer w=new OutputStreamWriter(System.out);  //转换成字符流
    BufferedWriter bw = new BufferedWriter(w);

    String line ;
    while((line = br.readLine())!=null) {
        bw.write(line);
        bw.newLine();
    }
    br.close();
    bw.close();
}

private static void method1(BufferedReader br) throws IOException {
    OutputStream os = System.out;
    String line;
    while((line = br.readLine())!=null) {
        os.write(line.getBytes());
        os.write("\r\n".getBytes());
    }
}

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}

二、将数据从console输入存到制定的文本中 
代码如下： 
package InputStream;

import java.io.FileWriter; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.io.Reader;

public class InputStreamReaderDemo {

public static void main(String[] args) throws IOException {
    //method1();
    InputStream is = System.in;  //将键盘输入的数据存入到is里面
    Reader r= new InputStreamReader(is); //用r来读取is里面的数据，将字节转换成字符类型的
    FileWriter fw = new FileWriter("c.txt");  //用fw来将r读出来的数据写入到c.txt里面

    char [] ch = new char[1024];
    int len;
    while((len = r.read(ch))!=-1) {
        fw.write(ch,0,len);
        fw.flush();
    }
    fw.close();
    r.close();
}

private static void method1() throws IOException {
    InputStream is  = System.in;

    FileWriter fw  = new FileWriter("b.txt");
    int len;
    byte [] byt = new byte [1024];
    while((len = is.read(byt))!=-1) {
        fw.write(new String(byt,0,len));
        fw.flush();
    }

    is.close();
    fw.close();
}