Why am i getting ?? when i try to read ä character from a text file in java?

问题

I am trying to read text from a text file. There are some special characters like å,ä and ö. When i make a string and print out that string then i get ?? from these special characters. I am using the following code:

File fileDir = new File("files/myfile.txt");

BufferedReader br = new BufferedReader(new InputStreamReader(
                      new FileInputStream(fileDir), "UTF8"));

String strLine;
while ((strLine = br.readLine()) != null)   {
    System.out.println("strLine: "+strLine);
}

Can anybody tell me whats the problem. I want strLine to show and save å, ä and ö as they are in text file. Thanks in advance.

回答1:

The problem might not be with the file but with the console where you are trying to print. I suggest you follow the following steps

1. Make sure the file you are reading is encoded in UTF-8.
2. Make sure the console you are printing to has the proper encoding/charset to display these characters

Finally, this article Unicode - How to get characters right? is a must read.

回答2:

Check here for the lists of Java supported encodings

Most common single-byte encoding that includes non-ascii characters is ISO8859_1; maybe your file is that, and you should specifiy that encoding for your FileInputStream

来源：https://stackoverflow.com/questions/11801543/why-am-i-getting-when-i-try-to-read-%c3%a4-character-from-a-text-file-in-java