如何在java中获取当前国家名称？

我想用java获取当前的国家名称。我使用这个代码

private HttpServletRequest request; 
Locale currentCountry = request.getLocale();  
System.out.println(currentCountry.getDisplayCountry());

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但是它是通过一个NullPointerException实现的，比如：

java.lang.NullPointerException

。在二线。请帮助我任何人。

代码片段不足以告诉您为什么得到空指针。我假设您在服务器端使用servlet

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;
import java.util.Locale;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.HttpServletBean;

public class MyServlet extends HttpServletBean {

    private static final long serialVersionUID = 1L;

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws IOException, ServletException {

        PrintWriter out = response.getWriter();

        Locale userlocale = request.getLocale();
        out.println("Your Country : " + userlocale.getCountry());

        out.println();
        out.println("");
    }
}

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你知道NullPointerException是什么吗？哪个国家的名称？服务器，客户端？谢谢Jens。我要客户国家/地区名称。可能是