java2--文件io流操作【例】

字节流

//2012.8.9
//IO流操作
import java.io.*;
public class IoDemo{
	public static void main(String args[]){
		OutputStream out = null;	//输出流
		InputStream in = null;		//输入流
		//目录
		String locket = "g:" + File.separator + "java" 
				+ File.separator + "do" + File.separator + "temp.txt";
		//输出过程
		try{
			File f = new File(locket);
			out = new FileOutputStream(f);
			String wrt = "Hello World!!!Hello World!!!Hello " +
						"World!!!Hello World!!!Hello World!!!Hello World!!!";
			byte b[] = wrt.getBytes();//转换为byte数组类型 
			out.write(b);
			System.out.println("写入完成！");
			out.close();
		}catch(Exception e){
			e.printStackTrace();	
		}
		//输入过程
		try{
			File f = new File(locket);
			in = new FileInputStream(f);
			byte b[] = new byte[in.available()];//定义biye数组 长度为文件大小
			in.read(b);
			String wrt = new String(b,0,b.length);
			System.out.println(wrt);
			in.close();	
		}catch(Exception e){
			e.printStackTrace();	
		}	
	}	
}