JAVA小练习142——缓冲输入输出字节流的练习

亦凉 2022-01-13 12:59 212阅读 0赞

import java.io.BufferedInputStream;
    import java.io.BufferedOutputStream;
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.FileNotFoundException;
    import java.io.IOException;
    
    public class Demo142 {
    
    	public static void main(String[] args) throws IOException {
    		readTest();
    		wirteTest();
    		
    		
    	}
    
    	
    	
    	public static void readTest() throws  IOException {
    		//第一步：找到目标文件
    		File file = new File("E:\\a.txt");
    		//第二步：建立文件与程序的输入通道
    		FileInputStream fileInputStream = new FileInputStream(file);
    		//第三部：建立缓冲输入字节流
    
    		BufferedInputStream bufferedInputStream = new BufferedInputStream(fileInputStream);
    		//读取文件数据
    		int content = 0; 
    		
    		while((content = bufferedInputStream.read())!=-1){
    			System.out.print((char)content);
    		}
    	
    		//关闭资源   
    		bufferedInputStream.close();
    	}
    	
    	
    	public static void wirteTest() throws  IOException{
    		
    		//找到目标文件对象
    				File file = new File("E:\\a.txt");
    				//建立数据的输出通道
    				FileOutputStream fileOutputStream = new FileOutputStream(file);
    				//建立缓冲输出字节流
    				BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(fileOutputStream);
    				//写数据
    				String data = "hello world";
    				bufferedOutputStream.write(data.getBytes());
    				
    				//bufferedOutputStream.flush(); //把缓冲字节数组的数据写到硬盘上去。
    				bufferedOutputStream.close();	
    		
    		
    	
    }
    	
    	
    }