InputStream 一个字节一个字节的读取

package chap10.sec03;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.InputStream;

public class Demo4 {

public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
File file =new File("D:/测试文件.txt");
InputStream in=new FileInputStream(file);//实例化FileInputStream
int fileLength=(int)file.length();
byte b[]=new byte[fileLength]; 
int temp=0;
int len=0;
while((temp=in.read())!=-1){
b[len++]=(byte) temp;
}
in.close();
System.out.println("读取到的内容是："+new String(b));
}

}