两种读取方法如下所示：

package cn.zll.demo;import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;public class WriteDemo {public static void main(String[] args) throws IOException {InputStreamReader reader=new InputStreamReader(new FileInputStream("out.txt"));//      int len=0;
//      while((len=reader.read())!=-1){
//          
//          System.out.print((char)len);
//          
//          
//      }int len=0;char[] b=new char[1024];while((len=reader.read(b))!=-1){System.out.println(new String(b, 0, len));}}}