javax.servlet.http.HttpServletResponse 得到 status_code
一) 在log4j的日志中需要输出应答的status_code,不用还真不知道,HttpServletResponse接口并没有getStatus()方法。
二) 自己动手,用一个Reponse的装饰器,解决这个问题。这算是一个过滤器和装饰器设计模式的典型应用吧
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import ying.car.shiro.ShiroUtils;
/**
* 记录http信息的Filter
*
*
*/
public class HttpInfoLoggingFilter implements Filter{
private static final Logger LOGGER = LoggerFactory.getLogger(HttpInfoLoggingFilter.class);
@Override
public void init(FilterConfig filterConfig) throws ServletException {
// 无配置
}
@Override
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
StatusExposingServletResponse response = new StatusExposingServletResponse((HttpServletResponse) res);
Integer currentUserId = getCurrentUserId();
String ip = request.getRemoteAddr();
String method = request.getMethod();
String url = request.getRequestURI();
String characterEncoding = request.getCharacterEncoding();
String referer = request.getHeader("Referer");
chain.doFilter(request, response);
int status = response.getStatus();
LOGGER.info("{}, {}, {}, {}, {}, {}, {}", currentUserId, ip, method, characterEncoding, referer, url, status);
}
@Override
public void destroy() {
// 无动作
}
private Integer getCurrentUserId() {
Integer currentUserId = 0;
try { currentUserId = ShiroUtils.getPrincipalDomainId(); } catch (Exception e) {} // apache-shiro框架
return currentUserId;
}
//~ ============================================================================================================================
public static class StatusExposingServletResponse extends HttpServletResponseWrapper implements HttpServletResponse {
private int status = 200;
public StatusExposingServletResponse(HttpServletResponse response) {
super(response);
}
@Override
public void setStatus(int sc) {
this.status = sc;
super.setStatus(sc);
}
public int getStatus() {
return status;
}
}
}
web.xml
<!-- apache-shiro 核心拦截器 -->
<filter>
<filter-name>shiroFilter</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<filter-mapping>
<filter-name>shiroFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- http信息日志过滤器 -->
<filter>
<filter-name>httpInfoLoggingFilter</filter-name>
<filter-class>ying.car.filter.HttpInfoLoggingFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>httpInfoLoggingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
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