如何在Java中使用IP地址查找城市名称

Question

我希望使用Java从IP地址获取城市名称

有什么想法吗？

Answer 1

从Andrey链接,这里是如何构建查询,此代码将返回一个HTML文件,其中包含当前IP的所有详细信息,包括城市;

String IP= "123.123.123.123";
URL link = new URL("http://www.geobytes.com/IpLocator.htm?GetLocation&template=php3.txt&IpAddress="+IP);

BufferedReader in = new BufferedReader(new InputStreamReader(link.openStream()));
String inputLine;

while ((inputLine = in.readLine()) != null){
     System.out.println(inputLine);             
}

in.close();

更新,2013年5月23日

之前的答案还可以,但它不是API调用,而是读取我之前提供的HTML页面,因为我没有找到任何免费的API.接下来是一个REST API调用,可以轻松使用并返回所需的所有信息,建议使用这个:

String ip = "2.51.255.200"; 
URL url = new URL("http://freegeoip.net/csv/" + ip);
connection = (HttpURLConnection) url.openConnection();
connection.connect();

InputStream is = connection.getInputStream();

int status = connection.getResponseCode();
if (status != 200) {
    return null;
}

reader = new BufferedReader(new InputStreamReader(is));
for (String line; (line = reader.readLine()) != null;) {
    //this API call will return something like:
    "2.51.255.200","AE","United Arab Emirates","03","Dubai","Dubai","","x-coord","y-coord","",""
    // you can extract whatever you want from it
}