util.java

一个模仿Windows下的记事本

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

class Util{
	public static String openFile(String filename){
		String s = "";
		StringBuffer sb = new StringBuffer();
		String c = "";
		try {
			BufferedReader in = new BufferedReader(new FileReader(filename));
			 s = in.readLine();
			 while(s!=null){
				 sb.append(s+"\n");
				 s = in.readLine();
			 }
			 c = sb.toString();
			 in.close();
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return c;
		
	}
	public static String saveFile(String filename,String data){
		try {
			BufferedWriter out = new BufferedWriter(new FileWriter(filename));
            out.write(data+"\n");
            out.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return data;
	}
}