java io 檔案讀寫操作

寫：

import java.io.*;

String filePath= "F:\\test.txt";

FileWriter fwriter = null;

fwriter = new FileWriter(filePath);

fwriter.write(“1”); //這裡要放入string類型

fwriter.flush();

fwriter.close();

讀：

try {

File file = new File(filePath);

if(file.isFile() && file.exists()) {

InputStreamReader isr = new InputStreamReader(new FileInputStream(file), "utf-8");

BufferedReader br = new BufferedReader(isr);

String lineTxt = null;

while ((lineTxt = br.readLine()) != null) {

System.out.println(lineTxt); //讀出的内容 這裡是string類型的

}

br.close();

} else {

System.out.println("檔案不存在!");

}

} catch (Exception e) {

System.out.println("檔案讀取錯誤!");

}

}