java 文件读写操作

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

public class FileTest {
    public static void main(String[] args) {
        try {
            BufferedReader br=new BufferedReader(new FileReader("doc/user.txt"));
            String str;
            while ((str=br.readLine())!=null){
                System.out.println(str);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}

import java.io.*;

public class FileWrite {
    public static void main(String[] args) {
        try {
            BufferedWriter bw=new BufferedWriter(new FileWriter("doc/write.txt")); //进行读操作
            BufferedReader br=new BufferedReader(new FileReader("doc/user.txt")); //进行写操作
            String strTemp="";
            while ((strTemp=br.readLine())!=null){
                bw.write(strTemp);
                bw.newLine();
            }
            bw.close(); //注意：这行一定不能少
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}