直接上代码，函数使用说明详见Java API文档
import java.io.*;
public class StreamDemo
{
public static void main(String[] args)
{
File f=new File("F:\\workspace\\JavaPrj\\test.txt");
FileOutputStream out=null;
try
{
out=new FileOutputStream(f);
byte[] b=new String("Hello,my name is cjc").getBytes();
System.out.println("\"Hello,my name is cjc\"has been writeen into "+f.getName()+".");
out.write(b);
out.close();
}
catch (FileNotFoundException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
try
{
FileInputStream in=new FileInputStream(f);
byte b[]=new byte[1024];
int cnt=0;
cnt=in.read(b);
//注意这里byte转化成String的方法
System.out.println("\""+new String(b,0,cnt)+"\"has been read from "+f.getName()+".");
}
catch (FileNotFoundException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
原文：http://blog.csdn.net/cjc211322/article/details/24837239
