servlets如何在java中获取当前国家名称？

Question

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());

但是它是通过一个NullPointerException实现的，比如：java.lang.NullPointerException。在二线。任何人都请帮助我

Answer 1

这段代码不足以说明为什么会得到空指针。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("");
    }
}