IO流——文件操作流之字符输入流FileReader

package com.io.ioDemo;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
//字符流读文件
public class FileReaderDemo {
	public static void main(String[] args) {
		FileReader fr = null;
		//1.创建一个字符流对象
		try {
			fr = new FileReader(new File("c:\\aa.txt"));
			//2.定义一个字符数组作为缓存区域
			char[] bt = new char[1024];
			//3.定义一个变量存储读取的字符的数量
			int hasread = 0;
			//4.循环获取数据
			//StringBuffer sb = new StringBuffer();
			try {
				while((hasread = fr.read(bt))!=-1){
					//5.把每一步获取的数据都放入StringBuilder中
					System.out.println(new String(bt,0,hasread));
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}finally{
			if(fr!=null){
				try {
					fr.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
	}
}