求助，java怎么用文件

[myownrain]

就是做一个日历记事本，可以储存日志，具体怎么写啊

[蠓虫带着秤砣飞]

package FileOp;

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

import javax.swing.JOptionPane;

public class FileDemo {
	public static void main(String[] args) {
		
		///////读文件
		File file = new File("e:/a.txt");
		FileInputStream inputfile = null;
		StringBuffer str= new StringBuffer(" ");
		try{
			inputfile = new FileInputStream(file);
		}	catch(FileNotFoundException fe)		{
			fe.printStackTrace();
		}
		int readbytes;
		try{
			while((readbytes = inputfile.read())!=-1){
				str.append((char)readbytes);
			}
		}catch (IOException e)		{
			e.printStackTrace();
		}
		System.out.print(str);
		try{
			inputfile.close();
		}catch(IOException e)	{
			e.printStackTrace();
		}
		
		
		///写文件
		File fOut = new File("e:/b.txt");
		FileOutputStream outStream=null;
		try{
			outStream = new FileOutputStream(fOut);
		}catch(FileNotFoundException fe)	{
			fe.printStackTrace();
		}
		
		try{
			outStream.write("abcdefg".getBytes());
		}catch(IOException ioe)		{
			ioe.printStackTrace();
		}
		try{
			outStream.close();
		}catch(IOException e){
			e.printStackTrace();
		}
	}
}

[蠓虫带着秤砣飞]

上面的处理中文会乱码，用这个吧。

package FileOp;

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

import javax.swing.JOptionPane;

public class FileDemo {
	public static void main(String[] args) {
		
		///////读文件
		File file = new File("e:/a.txt");
		FileInputStream inputfile = null;
		StringBuffer str= new StringBuffer(" ");
		try{
			FileReader readIn = new FileReader(file);
			int size = (int)file.length();
			int charsRead=0;
			char content[] = new char[size];
			while(readIn.ready())
				charsRead +=readIn.read(content, charsRead, size-charsRead);
			readIn.close();
			System.out.print(new String(content, 0, charsRead));
			try{
				readIn.close();
			}catch(IOException e)	{
				e.printStackTrace();
			}
		}catch(IOException exx)		{
			exx.printStackTrace();
		}
		
		
		///写文件
		File fOut = new File("e:/b.txt");
		FileOutputStream outStream=null;
		try{
			outStream = new FileOutputStream(fOut);
		}catch(FileNotFoundException fe)	{
			fe.printStackTrace();
		}
		
		try{
			outStream.write("abcdefg".getBytes());
		}catch(IOException ioe)		{
			ioe.printStackTrace();
		}
		try{
			outStream.close();
		}catch(IOException e){
			e.printStackTrace();
		}
	}
}