不多说，直接上干货！

 

 

 

CopyTextByBufTest.java

 

package zhouls.bigdata.DataFeatureSelection.test;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;public class CopyTextByBufTest {    /**     * @param args     * @throws IOException      */    public static void main(String[] args) throws IOException {        FileReader fr = new FileReader("a.txt");                BufferedReader bufr = new BufferedReader(fr);        FileWriter fw = new FileWriter("b.txt");        BufferedWriter bufw = new BufferedWriter(fw);                String line = null;        while((line=bufr.readLine())!=null){            bufw.write(line);            bufw.newLine();            bufw.flush();        }        bufw.close();        bufr.close();    }}