import?java.io.*;
import?java.util.ArrayList;

class?FileIO?{
????public?static?void?read（）?{
????????try?{?//?防止文件建立或讀取失敗，用catch捕捉錯誤并打印，也可以throw
????????????????/*?讀入TXT文件?*/
????????????String?pathname?=?“C語言成績管理系統(tǒng).txt“;?//?絕對路徑或相對路徑都可以，這里是絕對路徑，寫入文件時演示相對路徑
????????????File?filename?=?new?File（pathname）;?//?要讀取以上路徑的input。txt文件
????????????InputStreamReader?reader?=?new?InputStreamReader（new?FileInputStream（filename）?“UTF-8“）;?//?建立一個輸入流對象reader
????????????BufferedReader?br?=?new?BufferedReader（reader）;?//?建立一個對象，它把文件內(nèi)容轉(zhuǎn)成計算機能讀懂的語言
????????????String?line?=?““;
????????????line?=?br.readLine（）;
????????????while?（line?!=?null）?{
????????????????line?=?br.readLine（）;?//?一次讀入一行數(shù)據(jù)
????????????????System.out.println（line）;
????????????}
????????}?catch?（Exception?e）?{
????????????e.printStackTrace（）;
????????}
????}

????public?static?void?write（ArrayList?students）?{
????????try?{
???????????????/*?寫入Txt文件?*/
????????????//?相對路徑，如果沒有則要建立一個新的output。txt文件
????????????File?writename?=?new?File（“save.txt“）;
????????????writename.createNewFile（）;?//?創(chuàng)建新文件
????????????BufferedWriter?out?=?new?BufferedWriter（new?FileWriter（writename））;
????????????for?（Student?stu?:?students）?{
????????????????out.write（stu.toString（）?+?“\r\n“）;?//?\r\n即為換行
????????????}
????????????out.flush（）;?//?把緩存區(qū)內(nèi)容壓入文件
????????????out.close（）;?//?最后記得關(guān)閉文件
????????}?catch?（Exception?e）?{
????????????e.printStackTrace（）;
????????}
????}

????public?static?void?writeBySer（ArrayList?students）?{
????????try?{
????????????File?writename?=?new?File（“wxp.txt“）;
????????????objectOutputStream?os?=?new?objectOutputStream（
????????????????????new?FileOutputStream（“wxp.txt“））;
????????????os.writeobject（students）;//?將List列表寫進文件
????????????System.out.println（“寫入成功“）;
????????????os.close（）;
????????}?catch?（FileNotFoundException?e）?{
????????????e.printStackTrace（）;
????????}?catch?（IOException?e）?{
????????????e.printStackTrace（）;
????????}
????}

????public?static?void?readBySer（）?{
????????try?{
????????????objectInputStream?is?=?new?objectInputStream（new?FileInputStream（
????????????????????“wxp.txt“））;
????????????ArrayList?students?=?（ArrayList）?is.readobject（）;//?從流中讀取List的數(shù)據(jù)
????????????for?（Student?student?:?students）?{
????????????????System.out.println（student）;
????????????}
????????????is.close（）;
????????}?catch?（FileNotFoundException?e）?{
????????????e.printStackTrace（）;
????????}?catch?（IOException?e）?{
????????????e.printStackTrace（）;
????????}?catch?（ClassNotFoundException?e）?{
????????????e.printStackTrace（）;
????????}
????}
}