IO写入写出

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;


public class InputStreamDemo {
    public static StringBuffer read(String path){
//        File f=new File(path);
//        int length=(int) f.length();//获取文件的大小，用来确定数组德的长度
        InputStream input=null;//将input赋值为空
        
        
        try {
            input=new FileInputStream(path);//输入地址给input
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        int len=-1;
        StringBuffer sb=new StringBuffer();
        byte[] b=new byte[1024];//定义一个数组
        try {
            while((len=input.read(b))!=-1){
                sb.append(new String(b));
            }
            
            
            //System.out.print(sb);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            try {
                input.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                input=null;
            }
        }
        return sb;
        
        
    }
//    public static String String(String Path){
//        return Path;
        
    
    public static void Copy(String sorcePath,String toPath){
        OutputStream out=null;
    
        String str=read(sorcePath).toString();
        try {
            out=new FileOutputStream(toPath);

            out.write(str.getBytes());
            
            
            
            
            
            
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
        
    }
    
    
    
    
public static void main(String args[]){
    String dir1="C:\\Users\\Administrator\\Desktop\\M0314\\IOFile\\src\\InputStreamDemo.java";
            String dir2="C:\\Users\\Administrator\\Desktop\\M0314\\IOFile\\IO.txt";    
    read(dir1);

     Copy(dir1,dir2);
}
}