按行读取.txt文件，并按行写入到新文件中

package com.test.io;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

public class ReadWrite {

    public static void main(String[] args) {

        String inurl="D:/123.txt";

        File infile=new File(inurl);

        String outurl="D:/asd.txt";

        File outfile=new File(outurl);

        try {

            //如果写入的文件不存在创建新文件

            if(!outfile.exists()){

                outfile.createNewFile();

            }

            //文件的输入流读取文件

            FileInputStream in=new FileInputStream(infile);

            FileOutputStream out=new FileOutputStream(outfile);

            //读文件

            BufferedReader read=new BufferedReader(new InputStreamReader(in));

            //写文件

            BufferedWriter write=new BufferedWriter(new OutputStreamWriter(out));

            String temp="";

            while((temp=read.readLine())!=null){

                //写入文件

                write.write(temp+"\r\n");

                System.out.println("写入"+temp);

            }

            read.close();

            write.close();

            out.close();

            in.close();

        } catch (Exception e) {

            // TODO 自动生成的 catch 块

            e.printStackTrace();

        }

    }

}