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();
        }

    }

}