java - 如何将文件保存到目录

Question

到目前为止我所拥有的：

• 获取用户名和密码并将其写入文本文件的代码块。

  String usernameFilename;    
  usernameFilename = newUsernameField.getText();
  char[] signupPassword = newPasswordField.getPassword();
  String writePassword = new String(signupPassword);
  
  try {
      FileWriter userInfoWriter = new FileWriter(usernameFilename);
      BufferedWriter writeToFile = new BufferedWriter(userInfoWriter);   
      writeToFile.write(usernameFilename);  
      writeToFile.write("\r\n" + writePassword);
      writeToFile.close();
  

我需要完成的事情：

• 创建一个目录到一个名为users.
• 将文件保存usernameFilename到目录。

我试过的：

• 我在网上到处搜索！我找不到任何东西可以做到这一点：c

额外信息：由于所有计算机都不同，我想.getAbsolutePath()在创建目录时使用该方法。

Answer 1

看一眼：

• java.io.File
• File#exists
• File#isDirectory
• File#mkDirs

你可以更新你的代码看起来更像这个......

String usernameFilename;    
usernameFilename = newUsernameField.getText();
char[] signupPassword = newPasswordField.getPassword();
String writePassword = new String(signupPassword);

File users = new File("users");
if ((users.exists() && users.isDirectory()) || users.mkdirs()) {

    FileWriter userInfoWriter = null;
    BufferedWriter writeToFile = null;
    try {
        userInfoWriter = new FileWriter(users.getPath() + File.seperator + usernameFilename);
        writeToFile = new BufferedWriter(userInfoWriter);   
        writeToFile.write(usernameFilename);  
                    writeToFile.newLine();
        writeToFile.write(writePassword);

        //....
    } finally {
        try {
            writeToFile.close();
        } catch (Exception exp) {
        }

    }

} else {
    throw new IOException("Could not create/find Users directory");
}