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();
        }
    }
}