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();
}
}
}