IO源读取文件

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;

public class FileOperate {
	public static void main(String[] args) throws Exception {
		readAndWriteBy();
		readAndWrite();
	}
	//读取文件，再写入文件
	public static void readAndWriteBy() throws Exception{
		//一种
		FileInputStream f = new FileInputStream("d:/1.txt");
		InputStreamReader isr = new InputStreamReader(f,"GBK");
		BufferedReader br = new BufferedReader(isr);
		
		OutputStream fop = new FileOutputStream("d:/2.txt");
		OutputStreamWriter osr = new OutputStreamWriter(fop,"GBK");
		BufferedWriter bw = new BufferedWriter(osr);
		String line="" ;
		while((line=br.readLine())!=null){
			bw.write(line);
		}
		bw.flush();
		bw.close();
		br.close();
	}
	
	public static void readAndWrite() throws Exception{
		//二种
		File file = new File("d:/1.txt");
		BufferedReader br = new BufferedReader(new FileReader(file));
		BufferedWriter bw = new BufferedWriter(new FileWriter("d:/3.txt"));
		String line="" ;
		while((line=br.readLine())!=null){
			bw.write(line);
		}
		bw.flush();
		bw.close();
		br.close();
	}
	
	
}