Java读写文件和Scala读写文件

Java实现

package com.xtd.test.java;

import java.io.*;

public class AppentFile {

    private static FileWriter fileWriter = null;
    private static FileReader fileReader = null;
    private static BufferedWriter bufferedWriter = null;
    private static BufferedReader bufferedReader = null;

    public static void main(String[] args) {
        String MMSIFile = "F:/IDEA-WorkSpace/spark";
        try {
            // 写文件对象
            fileWriter = new FileWriter(MMSIFile+"/MMSIFile",true);
            bufferedWriter = new BufferedWriter(fileWriter);
            bufferedWriter.write(" java appent file1\n");
            bufferedWriter.write(" java appent file2\n");
            bufferedWriter.write(" java appent file3\n");
            bufferedWriter.close();

            // 读文件对象
            fileReader = new FileReader(MMSIFile+"/MMSIFile");
            // 读文件对象
            bufferedReader = new BufferedReader(fileReader);
            String str;
            while ( null != (str = bufferedReader.readLine()) ) {
                System.out.println(str);
            }
            bufferedReader.close();
        }
        catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Scala实现

package com.xtd.test.scala

import java.io.{BufferedReader, BufferedWriter, FileReader, FileWriter, IOException}

object AppentFile {

  var fileWriter:FileWriter = null
  var fileReader:FileReader = null
  var bufferedWriter:BufferedWriter = null
  var bufferedReader:BufferedReader = null

  def main(args: Array[String]): Unit = {

    val MMSIFile = "F:/IDEA-WorkSpace/spark"

    try {
      // 写文件对象
      fileWriter = new FileWriter(MMSIFile + "/MMSIFile", true)
      bufferedWriter = new BufferedWriter(fileWriter)
      bufferedWriter.write("scala appent file1\n")
      bufferedWriter.write("scala appent file2\n")
      bufferedWriter.write("scala appent file3\n")
      bufferedWriter.close()

      // 读文件对象
      fileReader = new FileReader(MMSIFile + "/MMSIFile")
      bufferedReader = new BufferedReader(fileReader)
      var str:String = null
      while ( None != (str=bufferedReader.readLine()) && null != str ) {
        println(str)
      }
      bufferedReader.close()
    } catch {
      case e: IOException =>
        e.printStackTrace()
    }
  }
}

执行结果

 java appent file1
 java appent file2
 java appent file3
scala appent file1
scala appent file2
scala appent file3