/**
 * @author CSDN_LQR
 * @TODO request之與請求頭相關的方法
 */
public class ServletDemo2 extends HttpServlet {

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

        // getHeaderNamesTest(request);
 


        getHeadersTest(request);

    }

    /**
     * 得到指定請求頭（該請求頭可能一個名字，多個值）
     * 
     * @param request
     */
    private void getHeadersTest(HttpServletRequest request) {
        Enumeration<String> headers = request.getHeaders("accept-language");
        while (headers.hasMoreElements()) {
            String headerValue = headers.nextElement();
            System.out.println(headerValue);
        }
    }

    /**
     * 得到所有請求頭名字
     * 
     * @param
 
 request
     */
    private void getHeaderNamesTest(HttpServletRequest request) {
        Enumeration<String> headerNames = request.getHeaderNames();
        while (headerNames.hasMoreElements()) {
            String header = headerNames.nextElement();
            String headerValue = request.getHeader(header);
            System.out.println(header + ":"
 
 + headerValue);
        }
    }

    /**
     * 得到指定請求頭
     * 
     * @param request
     */
    private void getHeaderTest(HttpServletRequest request) {
        String userAgent = request.getHeader("User-Agent");
        System.out.println("User-Agent:" + userAgent);
        userAgent = userAgent.toLowerCase();
        if (userAgent.contains("msie")) {
            System.out.println("IE瀏覽器");
        } else if (userAgent.contains("firefox")) {
            System.out.println("火狐瀏覽器");
        } else if (userAgent.contains("chrome")) {
            System.out.println("谷歌瀏覽器");
        } else if (userAgent.contains("oprea")) {
            System.out.println("Opera瀏覽器");
        } else {
            System.out.println("其他瀏覽器");
        }
    }

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

}