BufferedInputStream、BufferedOutputStream 带缓冲的输入输出流--对文件的操作

- 日理万妓 2022-05-15 04:45 136阅读 0赞

import java.io.BufferedInputStream;
    import java.io.BufferedOutputStream;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    
    public class Test7 {
    
    	public static void bufferStream() throws Exception {
    		BufferedInputStream bufferedInputStream=new BufferedInputStream(new FileInputStream("D://a.docx"));
    		BufferedOutputStream bufferedOutputStream=new BufferedOutputStream(new FileOutputStream("D://a复制.doc"));
    				int b=0;
    				long start=System.currentTimeMillis();
    		while((b=bufferedInputStream.read())!=-1) {
    			bufferedOutputStream.write(b);
    		}
    		bufferedInputStream.close();
    		bufferedOutputStream.close();
    		long end=System.currentTimeMillis();
    		System.out.println("缓冲花费时间："+(end-start)+" ms");
    	}
    	
    	public static void stream() throws Exception {
    		FileInputStream fis=new FileInputStream("d://a.docx");
    		FileOutputStream fos=new FileOutputStream("D://复制a.docx");
    		int b=0;
    		long start=System.currentTimeMillis();
    		while((b=fis.read())!=-1) {
    			fos.write(b);
    		}
    		fis.close();
    		fos.close();
    		long end=System.currentTimeMillis();
    		System.out.println("非缓冲花费时间："+(end-start)+"ms");
    	}
    	public static void main(String[] args) throws Exception {
           
    		bufferStream();
    		stream();
    	}
    
    }

运行结果：

![70][]

[70]: /images/20220515/551f0f2fa5b049bdb07e9482a29bc215.png