java读/写文件

读取文件参考：https://blog.csdn.net/weixin_42129373/article/details/82154471

写入文件参考：https://blog.csdn.net/BanketBoy/article/details/86504704

https://www.cnblogs.com/chenpi/p/5498731.html

 package text;

 import java.io.BufferedReader;
 import java.io.BufferedWriter;
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileReader;
 import java.io.FileWriter;
 import java.io.IOException;
 import java.util.Arrays;
 import java.util.Scanner;

 import javax.annotation.processing.FilerException;
 /*从input1.txt和input.txt文本文档轮流按行读取数据并按行写入output.txt文本文档
  */

 public class Main {
     public static void main(String[] args) {
         String aString = "E:\\ACM\\test\\input1.txt";//文件的路径
         String bString = "E:\\ACM\\test\\input.txt";
         String cString = "E:\\ACM\\test\\output.txt";

         try {
             FileReader aFileReader = new FileReader(aString);//字符流用于读/写文件
             FileReader bFileReader = new FileReader(bString);
             FileWriter cFileWriter = new FileWriter(cString);//如果写入第二参数为true，则为追加写入

             BufferedReader aBufferedReader = new BufferedReader(aFileReader);//包装字符流以提高效率
             BufferedReader bBufferedReader = new BufferedReader(bFileReader);
             BufferedWriter cBufferedWriter = new BufferedWriter(cFileWriter);

             String tempString = aBufferedReader.readLine();//按行读取
             while (tempString != null) {
                 cBufferedWriter.write(tempString);
                 cBufferedWriter.newLine();//写入换行

                 tempString = bBufferedReader.readLine();
                 cBufferedWriter.write(tempString);
                 cBufferedWriter.newLine();

                 tempString = aBufferedReader.readLine();
             }

             cBufferedWriter.close();//关闭流
             aBufferedReader.close();
             bBufferedReader.close();
             aFileReader.close();
             bFileReader.close();
             cFileWriter.close();
         } catch (FileNotFoundException e) {//没有try-catch会报错
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }
     }
 }