三种方式 下面为大家一一对应
这种方式简单点 但是可配置性不高
注意：一定得扫描到spring容器中
创建一个类 实现 filter接口
<u>预处理</u>。其中FilterChain可以将处理后的request和response对象传递到过滤链上的下一个资源。import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
@Component
public class LogFilter implements Filter {
private static final Logger LOG = LoggerFactory.getLogger(LogFilter.class);
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
// 打印请求信息
HttpServletRequest request = (HttpServletRequest) servletRequest;
LOG.info("------------- LogFilter 开始 -------------");
LOG.info("请求地址: {} {}", request.getRequestURL().toString(), request.getMethod());
LOG.info("远程地址: {}", request.getRemoteAddr());
long startTime = System.currentTimeMillis();
filterChain.doFilter(servletRequest, servletResponse);
LOG.info("------------- LogFilter 结束 耗时：{} ms -------------", System.currentTimeMillis() - startTime);
}
}结果
总结
1.过滤器用来实现通用的功能，减少代码冗余，提高可维护性；
2.一个过滤器可以配置给多个资源使用（编码过滤器）；
3.一个资源也可以配置多个过滤器，按照配置顺序调用。
如果不懂 请先看了 介绍再来
话不说多 直接上代码
创建拦截器
/**
* 拦截器：Spring框架特有的，常用于登录校验，权限校验，请求日志打印 /login
* @author : look-word
* 2022-06-26 13:55
**/
@Component
public class LogInterceptor implements HandlerInterceptor {
private static final Logger LOG = LoggerFactory.getLogger(LogInterceptor.class);
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
// 打印请求信息
LOG.info("------------- LogInterceptor 开始 -------------");
LOG.info("请求地址: {} {}", request.getRequestURL().toString(), request.getMethod());
LOG.info("远程地址: {}", request.getRemoteAddr());
long startTime = System.currentTimeMillis();
request.setAttribute("requestStartTime", startTime);
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
long startTime = (Long) request.getAttribute("requestStartTime");
LOG.info("------------- LogInterceptor 结束 耗时：{} ms -------------", System.currentTimeMillis() - startTime);
}
}注册拦截器
把我们的拦截器 注册到 拦截器链中
/**
* @author : look-word
* 2022-06-26 14:03
**/
@Configuration
public class SpringMvcConfig implements WebMvcConfigurer {
@Resource
private LogInterceptor logInterceptor;
/**
* 注册拦截器
* @param registry
*/
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry
.addInterceptor(logInterceptor)
.addPathPatterns("/**")// 对那些接口拦截
.excludePathPatterns("/login");// 对哪些接机口放行
WebMvcConfigurer.super.addInterceptors(registry);
}
}测试结果
