package J20250725; import java.io.FileWriter; import java.io.IOException; /** * @author WanJl * @version 1.0 * @title Demo11_RegisterUser * @description * @create 2025/7/25 */ public class Demo11_RegisterUser { /** * 用户注册 * @param username 用户名 * @param password 密码 * @return */ public static boolean registerUser(String username,String password){ FileWriter fw=null; try { fw=new FileWriter("D:/user.txt",true); fw.write(username); fw.write("\r\n"); fw.write(password); //刷新流,写完了数据,手动刷新 fw.flush(); } catch (IOException e) { e.printStackTrace(); }finally { try { fw.close(); } catch (IOException e) { e.printStackTrace(); } } return false; } public static void main(String[] args) { registerUser("zhangsan","123456"); } }