输入流

版权声明：JAVA https://blog.csdn.net/weixin_43190126/article/details/84894498

package com.qyl.InptuString;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.IOException;

import org.junit.Test;
public class inputString {
	@Test
	public void testFileinputStream() throws Exception {
		FileInputStream in = new FileInputStream("C:/Users/Administrator/Desktop/input.txt");
		//读取单个字节
		int len;
		while ((len=in.read())!=-1) {
			System.out.print((char)len);
		}
		
		//读取多个字节
		byte[] bt = new byte[1024*1024];
			int len1;
		while ((len1 = in.read(bt))!=-1) {
			System.out.println(new String(bt, 0, len1));
		}
	in.close();
	System.out.println();
	}
	
	
	
	//用字符流完成文本的读取
	@Test
	public void testFileReader() throws Exception {
		FileReader Read = new FileReader("C:/Users/Administrator/Desktop/input.txt");
		int len;
		
		while((len = Read.read())!= -1) {
			System.out.print((char)len);			
		}
		Read.close();//字符流必须要关闭资源才能读取
	}
}