利用输入输出流复制文件

java开发积累，IO流

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package com.jn.test;

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

/*
 * 利用输入输出流复制文件
 */
public class StreamTest {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        File file = new File("d:/彩虹.txt");
        FileInputStream fis = null;
        FileOutputStream fos = null;
        try {
            fis = new FileInputStream(file);
            fos = new FileOutputStream("d:/彩虹2.txt");
            int len = 0;
            byte[] buf = new byte[1024];
            String s;
            while ((len = fis.read(buf)) != -1) {
                s = new String(buf, 0, len, "GBK");
                fos.write(buf);
            }
            // 关资源
            fis.close();
            fos.close();
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO: handle exception
        } finally {
            if (null != fis) {
                try {
                    fis.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    fis = null;
                }
            }
            if (null != fos) {
                try {
                    fos.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    fos = null;
                }
            }
        }
    }
}