Java--读写文件综合

package javatest;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.text.SimpleDateFormat;
import java.util.Date;

class fileTest
{
    public static void main(String[] args)
    {
        Date dt = new Date();
        SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");

        String s = df.format(dt);
        System.out.println(s);
        String path = "C:\\Users\\hp\\Desktop\\test.txt";
        //readFile(path);
        /*writeTxtFile("C:\\Users\\hp\\Desktop\\test2.txt.",
                "C:\\Users\\hp\\Desktop\\test.txt");*/
        writeBinaryFile("C:\\Users\\hp\\Desktop\\c.jpg.",
                "C:\\Users\\hp\\Desktop\\a.jpg");

    }

    //读取文本文件
    public static void readFile(String filePath)
    {
        File file = new File(filePath);
        if (!file.exists())
        {
            System.out.println("No such file");
        }
        else
        {
            try
            {
                BufferedReader reader = new BufferedReader(new FileReader(file));
                String line = "";
                // StringBuffer sb=new StringBuffer();
                while ((line = reader.readLine()) != null)
                {
                    System.out.println(line);
                    // sb.append(line);
                }
                reader.close();
            }
            catch (Exception e)
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

    //复制文本文件
    public static void writeTxtFile(String destFile, String srcFile)
    {
        try
        {
            File file = new File(destFile);
            if (!file.exists())
            {
                System.out.println("No such file");
                file.createNewFile();
            }
            else
            {
                BufferedReader reader = new BufferedReader(new FileReader(
                        new File(srcFile)));
                String line = null;

                FileOutputStream out = new FileOutputStream(file);
                while ((line = reader.readLine()) != null)
                {
                    out.write(line.getBytes());
                }
                System.out.println("Copyed");
                out.close();
                reader.close();
            }
        }
        catch (Exception e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

    //复制二进制文件，如图片等
    public static void writeBinaryFile(String destFile, String srcFile){
        try
        {
            File file = new File(destFile);
            if (file.exists())
            {
                System.out.println("File already exists,stop writting!");
            }
            else
            {
                System.out.println("Creating new file...");
                file.createNewFile();
                FileInputStream fin = new FileInputStream(new File(srcFile));
                byte[]buff=new byte[2014];

                FileOutputStream fout = new FileOutputStream(file);
                while((fin.read(buff))!= -1)
                {
                    fout.write(buff);
                }
                System.out.println("Copyed");
                fout.close();
                fin.close();
            }
        }
        catch (Exception e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}