FileInputStream和FileWriter(本地文件读取和写入)

package Javastudy;

import java.io.*;

public class file_2 {
 public static void main(String[] args) throws FileNotFoundException {
 try {
 String path = "C:/Users/ZSM/Desktop/ceshi_2.txt"; //输出文件路径
 File file = new File(path);
 FileWriter fot = new FileWriter(file,true); //追加
 BufferedWriter bufferedWriter = new BufferedWriter(fot);
 if (!file.exists()) {
 file.createNewFile();
 }

 //BufferedReader str= new BufferedReader(new FileReader("C:/Users/ZSM/Desktop/ceshi.txt"));
 BufferedReader str = null;
 str = new BufferedReader(new InputStreamReader(new FileInputStream("C:/Users/ZSM/Desktop/ceshi.txt"), "GBK"));
 //读取数据文件并指定字符集

 String aa = null;
 while ((aa = str.readLine()) != null) {
 String[] bb = aa.split("\t"); //按TAB分割
 int cc = Integer.parseInt(bb[0]); //字符串转int型
 grade_class hh = new grade_class(); //调用grade_class
 String gg = hh.grade_class(cc);
 String dd = bb[1];
 String mm = (dd + ' ' + cc + " " + gg); // 数据处理结果
 System.out.println(mm);
 bufferedWriter.write(mm);
 bufferedWriter.newLine();
 bufferedWriter.flush();
 }
 bufferedWriter.close();
 }catch(IOException e){
 e.printStackTrace();
 }
 }
}