java - バイト配列を文字列に変換する

Question

BlackBerry でバイト配列を文字列に変換するにはどうすればよいですか?

利用した

new String(bytearray,encoding type);

toString() を呼び出すときに取得[B@fb5955d6しています。この文字列を BlackBerry で読み取り可能な形式で取得するのを手伝ってくれる人はいますか?

Answer 1

You don't show us where this byte data is coming from, or what value you expect it to have. So, I'm not sure I can fully debug your problem. But, hopefully this helps:

The reason you are seeing [B@fb5955d6 printed out when you simply call toString() on your byte array is that the default implementation of toString() will just print out a short code for the array data type (e.g. byte), and then something like an address (if you're familiar with C/C++) of your variable, which is almost never what you really want, especially in Java.

When you have binary data (as a byte[]), Java doesn't know whether you intend that data to be a String, or a ButtonField, or a FuzzyWarble. So, it has nothing more meaningful to print out than the object's address.

If you want to print out String data, you need to create a String object with the byte[], but to do that, you need to either use the default character encoding, or specify which encoding you want. "UTF-8" and "ASCII" are two popular encodings.

If I run this code

  try {         
     byte[] bytes = new byte[] { 100, 67, 126, 35, 53, 42, 56, 126, 122 };
     System.out.println("bytes are " + bytes.toString());
     String s = new String(bytes, "UTF-8");
     System.out.println("string is " + s);
  } catch (UnsupportedEncodingException e1) {
  }

I see this

bytes are [B@3b50e2ee
string is dC~#5*8~z

As you see, the address I see is different from the one you see (because I'm running on a different machine, with different memory layout). But, when converted to a String with "UTF-8" encoding, I see the value that you see.

So, maybe that's the right value?

Again, we don't know where the binary data comes from, or what it's supposed to be, but I can tell you that the code above is a typical way to convert byte arrays to strings.

Answer 2

これを試して -

byte[] byteArray = new byte[] {87, 79, 87, 46, 46, 46};

String value = new String(byteArray);

これにより、「WOW ..」という値が得られます