IO Demo01

package IOTest;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;

public class FileAddLineNum {

	public static void main(String[] args) throws IOException {
		m1();
//		savaWebHtml();
//		readFromConsole();
//		charSetTest();
	}

	private static void charSetTest() {
		String hello = "你好";
		Charset ch = Charset.forName("GBK");
		ByteBuffer bf = ch.encode(hello);
		System.out.println(ch.decode(bf).toString());
	}

	private static void readFromConsole() throws IOException {
		BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
		String out = null;
		while(!((out = reader.readLine().toString()).equals("quit"))) {
			System.out.println(out);
		}
	}

	private static void savaWebHtml() throws MalformedURLException, IOException {
		URL url = new URL("http://www.eclipse.org/resources/");
		BufferedInputStream bis = new BufferedInputStream(url.openStream());
		InputStreamReader isr = new InputStreamReader(bis);
		BufferedReader reader = new BufferedReader(isr);
		StringBuilder sb = new StringBuilder();
		String s = null;
		while((s = reader.readLine()) != null){
			if(s.trim().equals(""))
				continue;
			sb.append(s).append("\n");
		}
		System.out.println(sb.toString());
		BufferedWriter writer = new BufferedWriter(new FileWriter("src/eclipse.html"));
		writer.write(sb.toString());
		writer.flush();
		writer.close();
	}

	private static void m1() throws FileNotFoundException, IOException {
		BufferedReader reader = new BufferedReader(new FileReader("src/log4j.properties"));
		StringBuilder sb = new StringBuilder();
		String s = null;
		int linenum = 0;
		while((s = reader.readLine()) != null){
			if(s.trim().equals(""))
				continue;
			sb.append(++linenum).append("\t");
			sb.append(s).append("\n");
		}
		BufferedWriter writer = new BufferedWriter(new FileWriter("src/log4j_copy.properties"));
//		PrintWriter writer = new PrintWriter(new BufferedWriter(new FileWriter("src/log4j_copy.properties")));
		writer.write(sb.toString());
		writer.flush();
		writer.close();
		reader.close();
	}
}