【开发实践】Springboot3.4 LogFilter不起作用的解决方案

原因：

javax.serverlet.* 不兼容了

//import javax.servlet.*;
//import javax.servlet.http.HttpServletRequest;
//import javax.servlet.http.HttpServletResponse;

解决方案：

使用

jakarta.servlet.*

import jakarta.servlet.*;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

完整代码：

//springboot 3.4版本不兼容，需要用jakarta.servlet
import jakarta.servlet.*;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

//import javax.servlet.*;
//import javax.servlet.http.HttpServletRequest;
//import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

@Component
public class LogFilter implements Filter {

    private static final Logger log = LoggerFactory.getLogger(LogFilter.class);

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        // 初始化过滤器
        //System.out.println("过滤器初始化");
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        //System.out.println("过滤器执行");
        HttpServletRequest httpRequest = (HttpServletRequest) request;

        // 记录请求开始时间
        long startTime = System.currentTimeMillis();

        // 记录请求地址
        String requestURI = httpRequest.getRequestURI();
        log.info("请求地址: " + requestURI);

        // 记录远程地址
        String remoteAddr = httpRequest.getRemoteAddr();
        log.info("远程地址: " + remoteAddr);

        // 记录请求日志
        logRequest(httpRequest);

        // 记录响应日志
        logResponse((HttpServletResponse) response);

        // 记录请求结束时间
        long endTime = System.currentTimeMillis();

        // 计算请求时间
        long requestTime = endTime - startTime;

        // 打印请求时间
        log.info("请求时间: " + requestTime + "ms");

        // 打印响应内容（如果需要）
        // System.out.println("响应内容: " + responseWrapper.toString());
    }

    @Override
    public void destroy() {
        // 销毁过滤器
    }

    private void logRequest(HttpServletRequest request) {
        log.info("请求方法: " + request.getMethod());
        log.info("请求URL: " + request.getRequestURL());
        log.info("请求头: " + request.getHeader("User-Agent"));
    }

    private void logResponse(ServletResponse response) {
        HttpServletResponse httpResponse = (HttpServletResponse) response;
        log.info("响应状态码: " + httpResponse.getStatus());
    }
}

另外，application.properties配置启动日志过滤器

# 在application.properties中
spring.mvc.filters.logFilter.enabled=true