Java中I/O的字符流InputStreamReader和OutputStreamWriter

1. InputStreamReader和OutputStreamWriter的使用(Decorator)

BufferedReader.readLine()方法可以一次读取一行。

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
public class StreamTest {
    public static void main(String[] args) throws Exception {
        FileOutputStream fos = new FileOutputStream("file.txt");
        OutputStreamWriter osw = new OutputStreamWriter(fos);
        BufferedWriter bw = new BufferedWriter(osw);
        bw.write("http://www.google.com");
        bw.write("\n");
        bw.write("http://www.baidu.com");
        bw.close();
        FileInputStream fis = new FileInputStream("file.txt");
        InputStreamReader isr = new InputStreamReader(fis);
        BufferedReader br = new BufferedReader(isr);
        String str = br.readLine();
        while(null != str){
            System.out.println(str);
            str = br.readLine();
        }
        br.close();
    }
}

public class StreamTest2 {
    public static void main(String[] args) throws Exception {
        InputStreamReader isr = new InputStreamReader(System.in);
        BufferedReader br = new BufferedReader(isr);
        String str;
        while(null != (str = br.readLine())){
            System.out.println(str);
        }
        br.close();
    }
}