java基础-复制

package hanqi.test;

import java.io.FileInputStream;


import java.io.FileOutputStream;


    public class Test06wenjianfuzhi {
        public static void main(String[] args){
    //文件复制
    
    //1、边读边写
    
    //读 输入流
    
    try{
        FileInputStream in = new FileInputStream("d:/picasa39_3.9.141.259_setup.1447731330.exe");
        
        byte[] b = new byte[1024];
        
        int i=-1;
        
        //写 输出流
        FileOutputStream out = new FileOutputStream("e:/0.exe");
        
        //边读边写
        while((i=in.read(b))>0)
        {
            //写
            out.write(b, 0, i);
        }
        
        
        out.close();
        in.close();
        
        System.out.println("复制完成");
    }
    catch(Exception e){
        
        e.printStackTrace();
        
    }
    
}
}

package hanqi.test;

import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;


public class Test7 {

    public static void main(String[] args) {
        // TODO 自动生成的方法存根
        
        //字符流
        
        //输出流
        FileWriter fw;
        try {
            fw = new FileWriter("d:/test/test03.txt",true);
            
            fw.write("字符流\r\n");
            
            fw.close();
            
            System.out.println("写入成功");
            
            //输入流
            
            FileReader fr = new FileReader("d:/test03.txt");
            
            char[] cbuf = new char[1024];
            
            int i = -1;
            
            StringBuilder str = new StringBuilder();
            
            while((i=fr.read(cbuf))>0)
            {
                str.append(new String(cbuf,0,i));
            }
            
            fr.close();
            System.out.println(str);
            
        } catch (IOException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }
        
        
        
        
    }

}

package hanqi.test;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class Test08daihuancun {

    public static void main(String[] args) {
        
        // 字符流
        try {
        FileWriter    fw = new FileWriter("d:/test07.txt");

        // 带缓存的字符流
        //需要先构造字符流对象，然后在家上缓存
        BufferedWriter bw =new BufferedWriter(fw);
        
        bw.write("带缓存的字符流\r\n");
        
        bw.close();
        
        fw.close();
        
        System.out.println("成功");
        
        //读取
        FileReader fr= new FileReader("d:/test08.txt");
        BufferedReader br= new BufferedReader(fr);
        
        //带缓存的读取
        //按行读取
        //需要循环
        String str;
        StringBuilder sb1 = new StringBuilder();
        
        //当前返回的字符串为Null，那么循环结束
        while((str=br.readLine())!=null)
        {
            sb1.append(str+"\n");
        }
        //String str=br.readLine();
        System.out.println(sb1);
          
        fr.close();
        br.close();
        
        
        } catch (IOException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }
        

    }
 
}