如何覆盖HttpServletRequest toString方法？

Question

我正在使用基于Servlet的Web应用程序，并希望获得适当的日志记录支持。我正在使用Log4j，当我收到任何请求时，我想用它的整个属性（不是所有内容，只是标题和参数）来记录它。

例如：

@WebServlet(name = "Login", value = "/Login")
public class Login extends HttpServlet {
final static Logger logger = Logger.getLogger(Login.class);

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    logger.info(req); // I want to log request with its 
     // properties: such as request parameters, headers and so on
    // TODO some logic here
}

}

所以，我怎么能管道覆盖某种实际上是接口的HttpServletRequests toString()方法。为它创建Wrapper类是否是个好主意，并且可以在那里覆盖toString()方法？

Answer 1

您可以像这样实现过滤器，您可以获取所有请求标头和参数，然后您就可以登录到您的文件

@Component
public class HttpFilter implements Filter {
private static final Logger LOGGER = LogManager.getLogger(HttpLogging.class);

@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain 
chain)
        throws IOException, ServletException {
    // TODO Auto-generated method stub

    HttpServletRequest httpServletRequest  = (HttpServletRequest) request;
    HttpServletResponse httpServletResponse  = (HttpServletResponse)response;
    LOGGER.info("logger before method aop FROM FILTER CLASS");
    LOGGER.info("content type " + httpServletRequest.getContentType());
    LOGGER.info("Local Name" + httpServletRequest.getLocalName());
      LOGGER.info("content type " + httpServletRequest.getContentType());
         LOGGER.info("request uri " +  httpServletRequest.getRequestURI());
         LOGGER.info("get Method " + httpServletRequest.getMethod());
         LOGGER.info("query string "  +httpServletRequest.getQueryString() );
         LOGGER.info("server name " + httpServletRequest.getServerName());
         LOGGER.info("server port "  + httpServletRequest.getServerPort());
         LOGGER.info("Parameter names  " + httpServletRequest.getParameter("empid"));


    System.out.println(request.getContentType());

    chain.doFilter(httpServletRequest, httpServletResponse);





  }

}

Answer 2

这是我过去使用的。它使用SLF4J，但语句应与Log4J几乎相同。

import java.util.Enumeration;

import javax.servlet.http.HttpServletRequest;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class RequestLogger {

    public static void logRequestAttributes(Logger logger, HttpServletRequest request) {
        logger.debug("Attributes:");
        for (Enumeration<?> attributeNames = request.getAttributeNames(); attributeNames.hasMoreElements(); ) {
            String nextAttributeName = (String) attributeNames.nextElement();

            logger.debug("attribute \"" + nextAttributeName + "\" value is \"" + request.getAttribute(nextAttributeName) + "\"");
        }

        logger.debug("Parameters:");
        for (Enumeration<?> parameterNames = request.getParameterNames(); parameterNames.hasMoreElements(); ) {
            String nextParameterName = (String) parameterNames.nextElement();

            logger.debug("parameter \"" + nextParameterName + "\" value is \"" + request.getParameter(nextParameterName) + "\"");
        }

        logger.debug("Headers:");
        for (Enumeration<?> e = request.getHeaderNames(); e.hasMoreElements(); ) {
            String nextHeaderName = (String) e.nextElement();

            logger.debug("header name: \"" + nextHeaderName + "\" value is \"" + request.getHeader(nextHeaderName) + "\"");
        }

        String logStatement = "Server Name: " + request.getServerName() + "\n";
        logStatement += "\tServer Port: " + request.getServerPort() + "\n";
        logStatement += "\tServlet Path: " + request.getServletPath() + "\n";
        logStatement += "\tMethod: " + request.getMethod() + "\n";
        logStatement += "\tPath info: " + request.getPathInfo() + "\n";
        logStatement += "\tPath translated: " + request.getPathTranslated() + "\n";
        logStatement += "\tRequest URI: " + request.getRequestURI() + "\n";
        logStatement += "\tRequest URL: " + request.getRequestURL() + "\n";
        logStatement += "\tQuery String: " + request.getQueryString() + "\n";
        logStatement += "\tContext path: " + request.getContextPath() + "\n";

        logger.debug(logStatement);
    }
}