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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) {
// 写入文件的路径
String filePath = "F:/IDEA-WorkSpace/spark";
// 写入的文件名称
String fileName = "MMSIFile";
readAndWrite(filePath,fileName);
}
public static void readAndWrite(String filePath,String fileName){
try {
/************** 写文件 ************/
// true：追加写入，flase：覆盖写入（默认覆盖写入）
fileWriter = new FileWriter(filePath+"/"+fileName,true);
// 对于小量数据少数写入使用 fileWriter 效率更高
fileWriter.append("Java FileWriter Apend Write File!\n");
// 对于大量数据对此写入使用 bufferedWriter 效率更高
bufferedWriter = new BufferedWriter(fileWriter);
bufferedWriter.write("Java BufferedWriter Apend Write File!\n");
bufferedWriter.close();
fileWriter.close();
/************** 读文件 ************/
fileReader = new FileReader(filePath+"/"+fileName);
bufferedReader = new BufferedReader(fileReader);
String str;
while ( null != (str = bufferedReader.readLine()) ) {
System.out.println(str);
}
bufferedReader.close();
fileReader.close();
}
catch (IOException e) {
e.printStackTrace();
}
}
}
package com.xtd.test.scala
import java.io.{BufferedReader, BufferedWriter, FileReader, FileWriter, IOException}
object AppentFile {
private var fileWriter:FileWriter = null
private var fileReader:FileReader = null
private var bufferedWriter:BufferedWriter = null
private var bufferedReader:BufferedReader = null
def main(args: Array[String]): Unit = {
// 写入文件的路径
val filePath = "F:/IDEA-WorkSpace/spark"
// 写入的文件名称
val fileName = "MMSIFile"
readAndWrite(filePath, fileName)
}
def readAndWrite(filePath: String, fileName: String): Unit = {
try {
/** ************ 写文件 ************/
// true：追加写入，flase：覆盖写入（默认覆盖写入）
fileWriter = new FileWriter(filePath + "/" + fileName, true)
// 对于小量数据少数写入使用 fileWriter 效率更高
fileWriter.append("Scala FileWriter Apend Write File!\n")
// 对于大量数据对此写入使用 bufferedWriter 效率更高
bufferedWriter = new BufferedWriter(fileWriter)
bufferedWriter.write("Scala BufferedWriter Apend Write File!\n")
bufferedWriter.close()
fileWriter.close()
/** ************ 读文件 ************/
fileReader = new FileReader(filePath + "/" + fileName)
bufferedReader = new BufferedReader(fileReader)
var str:String = null
while ( None!=(str = bufferedReader.readLine) && null!=str ) println(str)
bufferedReader.close()
fileReader.close()
} catch {
case e: IOException =>
e.printStackTrace()
}
}
}
csJava FileWriter Apend Write File!
Java BufferedWriter Apend Write File!
Scala FileWriter Apend Write File!
Scala BufferedWriter Apend Write File!
