IO流的输出总结

妖狐艹你老母 2021-09-20 11:26 269阅读 0赞

> ** 方式一：  
> String line=null;  
>         while((line=br.readLine())!=null)\{  
>             bw.write(line);  
>             bw.newLine();  
>             bw.flush();  
>         \}  
> 方式二：  
> char\[\] buf=new char\[1024\];  
>         int len=0;  
>         while((len=br.read(buf))!=-1)\{  
>             bw.write(buf,0,len);  
>         \}  
> 方式三：  
> int len=0;  
>         while((len=br.read())!=-1)\{  
>             bw.write(len);  
>         \}**

--------------------

【一】字符流（readLine()）

import java.io.*;
    class Zongjie
    {
    	public static void main(String[] args) throws IOException{
    		BufferedReader br=new BufferedReader(new FileReader("b.txt"));
    		BufferedWriter bw=new BufferedWriter(new FileWriter("2.txt"));
    		String line=null;
    		while((line=br.readLine())!=null){
    			bw.write(line);
    			bw.newLine();
    			bw.flush();
    		}
    		bw.close();
    		br.close();
    
    	}
    }

【二】字节流/字符流（缓冲区）

import java.io.*;
    class Zongjie
    {
    	public static void main(String[] args) throws IOException{
    		BufferedReader br=new BufferedReader(new FileReader("b.txt"));
    		BufferedWriter bw=new BufferedWriter(new FileWriter("2.txt"));
    		char[] buf=new char[1024];
    		int len=0;
    		while((len=br.read(buf))!=-1){
    			bw.write(buf,0,len);
    		}
    		bw.close();
    		br.close();
    	}
    }

【三】字节流/字符流（read()）

import java.io.*;
    class Zongjie
    {
    	public static void main(String[] args) throws IOException{
    		BufferedReader br=new BufferedReader(new FileReader("b.txt"));
    		BufferedWriter bw=new BufferedWriter(new FileWriter("2.txt"));
    		int len=0;
    		while((len=br.read())!=-1){
    			bw.write(len);
    		}
    		bw.close();
    		br.close();
    	}
    }