文件的操作类

package test;

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

public class FileOperation {
/**
* 创建文件
* @param fileName
*/
public static boolean createFile(File fileName){
if(!fileName.exists()){ 
try {
fileName.createNewFile();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return true;
}

/**
* @description 读取TXT文件内容
* @throws IOException 
*/
public static String readTxtFile(File fileName) throws IOException{
String result = null;
FileReader fileReader = null;
BufferedReader bufferedReader = null;
fileReader = new FileReader(fileName);
bufferedReader = new BufferedReader(fileReader);

String read = null;
int count = 0;
while((read = bufferedReader.readLine()) != null){
result = result + count + read + "
";
count++;
}

if(bufferedReader != null){
bufferedReader.close();
}

if(fileReader != null){
fileReader.close();
}

System.out.println("读取文件的内容是： " + "
" + result);
return result;
}

/**
* @description 写文件
* @param args
* @throws UnsupportedEncodingException 
* @throws IOException
*/
public static boolean writeTxtFile(String content,File fileName) throws UnsupportedEncodingException, IOException{
FileOutputStream o = null;
o = new FileOutputStream(fileName);
o.write(content.getBytes("UTF-8"));
o.close();
return true; 
}

/**
* @description 单元测试
* @throws IOException
*/
public static void main(String[] args) throws IOException {
File file = new File("d:/hello.txt");
Date date = new Date();
SimpleDateFormat day = new SimpleDateFormat("yyyyMMddHHmmss");
String dateName = day.format(date);
File copyFile = new File("d:/" + dateName + ".txt");
String content = readTxtFile(file);
createFile(copyFile);
writeTxtFile(content,copyFile);
}
}