通过 IP 获取地理位置（Spigot 1.8 和 1.13.2）

Question

i Want to find out the geolocation by only providing the ip adress. My Aim is to save city, country, postal code and other informations.

CraftPlayer cp = (CraftPlayer)p;
String adress = cp.getAddress();

Any short possibilities, to find out by only using ip?

Answer 1

There are a lot of websites that provide free databases for IP geolocation.

Examples include:

• MaxMind
• IP2Location

At the plugin startup you could download one of these databases and then query it locally during runtime.

If you choose do download the .bin format you will have to initialize a local database and then import the data. Otherwise you could just use the csv file with a Java library like opencsv .

From the documentation of opencsv:

For reading, create a bean to harbor the information you want to read, annotate the bean fields with the opencsv annotations, then do this:

 List<MyBean> beans = new CsvToBeanBuilder(FileReader("yourfile.csv")) .withType(Visitors.class).build().parse();

Link to documentation: http://opencsv.sourceforge.net

Answer 2

I recommend using http://ip-api.com/docs/api:newline_separated

You can then chose what information you need and create your HTTP-link like:

http://ip-api.com/line/8.8.8.8?fields=49471

The result in this example would be:

success
United States
US
VA
Virginia
Ashburn
20149
America/New_York

So you can create a method in Java to read HTTP and split it at \\n to get the lines:

private void whatever(String ip) {
    String ipinfo = getHttp("http://ip-api.com/line/" + ip + "?fields=49471");
    if (ipinfo == null || !ipinfo.startsWith("success")) {
        // TODO: failed
        return;
    }
    String[] lines = ipinfo.split("\n");
    // TODO: now you can get the info
    String country = lines[1];
    /*
    ...
     */
}

private static String getHttp(String url) {
    try {
        BufferedReader br = new BufferedReader(new InputStreamReader(new URL(url).openStream()));
        String line;
        StringBuilder sb = new StringBuilder();
        while ((line = br.readLine()) != null) {
            sb.append(line).append(System.lineSeparator());
        }
        br.close();
        return sb.toString();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return null;
}

just make sure not to create to many querys in a short amount of time since ip-api.com will ban you for it.