JavaEE 添加简单的日志过滤器

最新推荐文章于 2025-05-25 18:27:18 发布

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本文将介绍如何在JavaEE应用中添加和配置日志过滤器，通过web.xml文件设置过滤规则，实现对请求和响应的日志记录，提升应用程序的可追溯性和调试效率。

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web.xml

 <!-- 日志过滤器-->
    <filter>
       <filter-name>logFilter</filter-name>
       <filter-class>chapter9.RequestLogFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>logFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

过滤器

package chapter9;

import org.apache.commons.lang3.time.StopWatch;

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 java.io.IOException;
import java.time.Instant;

/**
 * 日志过滤器
 */
public class RequestLogFilter implements Filter
{
    @Override
    public void doFilter(ServletRequest request, ServletResponse response,
                         FilterChain chain) throws IOException, ServletException
    {
        Instant time = Instant.now();
        StopWatch timer = new StopWatch();
        try
        {
            timer.start();
            chain.doFilter(request, response);
        }
        finally
        {
            timer.stop();
            HttpServletRequest in = (HttpServletRequest)request;
            HttpServletResponse out = (HttpServletResponse)response;
            String length = out.getHeader("Content-Length");
            if(length == null || length.length() == 0)
                length = "-";
            System.out.println(in.getRemoteAddr() + " - - [" + time + "]" +
                    " \"" + in.getMethod() + " " + in.getRequestURI() + " " +
                    in.getProtocol() + "\" " + out.getStatus() + " " + length +
                    " " + timer);
        }
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException { }

    @Override
    public void destroy() { }
}