【每日日报】第三十三天---文件操作（缓冲流）

1 今天继续看书

缓冲流读文件

package File;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;

public class BufferedReaderDemo {
    public static void main(String[] args)throws IOException{
        read();
    }
    public static void read() throws IOException{
        BufferedReader read=new BufferedReader (new InputStreamReader(new FileInputStream("D:/Hello.txt")));
        String line=null;
        while((line=read.readLine())!=null){
            System.out.println(line);
        }
        read.close();
    }

}

缓冲流写文件

package File;
import java.io.BufferedWriter;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;

public class BufferedWriterDemo {
    public static void main(String[] args)throws IOException{
        write();
    }
    public static void write()throws IOException{
        BufferedWriter w=new BufferedWriter(new OutputStreamWriter(new FileOutputStream("D:/Hello.txt")));
        w.write("Hello");
        w.write("Java");
        w.close();
    }

}

使用BufferedInputStream和BufferedOutputStream读写图片

package File;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class BufferedInputOutput {
    public static void main(String[] args)throws IOException{
        outIn();
    }
    public static void outIn()throws IOException{
        BufferedInputStream in=new BufferedInputStream(new FileInputStream("C:\Users\linmob\Pictures\ps\a.png"));
        BufferedOutputStream out=new BufferedOutputStream(new FileOutputStream("C:\Users\linmob\Pictures\ps\a2.png"));
        byte[] buf=new byte[1024];
        int len=-1;
        while((len=in.read(buf))!=-1){
            out.write(buf,0,len);
        }
        out.close();
        in.close();
    }
}

2 没有其他问题 

3 明天继续看书