服务端在定位错误的时候，有时候要还原现场，这就要把当时的所有入参参数都能记录下来，GET还好说，基本NGINX都会记录。但是POST的请求参数基本不会被记录，这就需要我们通过一些小技巧来记录这些参数，放入日志，这里我们通过自定义拦截器来做这个操作。

1.编写自定义拦截器

我们紧接上一章的工程源码来做

package com.example.firstweb.interceptor;

import com.example.firstweb.util.Constants;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Enumeration;

@Component
public class AccessInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object obj) throws Exception {
        String queryPath = request.getContextPath() + request.getServletPath();
        StringBuffer alldata=new StringBuffer();
        alldata.append("http://" + request.getServerName() + ":" + request.getServerPort()+ queryPath);

		//get请求
        if (null != request.getQueryString()) {
            alldata.append("?" + request.getQueryString());
            alldata.append(" ");
        }else{
            alldata.append(" ");
        }


        //POST请求
        Enumeration<String> keys = request.getParameterNames();

        if (null != keys) {
            while (keys.hasMoreElements()) {
                String key = keys.nextElement();
                String value = request.getParameter(key);

                alldata.append(key + "=" + value + "&");
            }
        }

        Constants.LOG_ACCESS_INFO.info(alldata.toString());
        alldata.setLength(0);
        return true;
    }

}

2.配置自定义拦截器

package com.example.firstweb.config;

import com.example.firstweb.interceptor.AccessInterceptor;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import javax.annotation.Resource;
import java.util.List;

@Configuration
public class WebConfig implements WebMvcConfigurer {

    @Resource
    private AccessInterceptor accessInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // 自定义拦截器，添加拦截路径和排除拦截路径
        registry.addInterceptor(accessInterceptor).addPathPatterns("/**")
                .excludePathPatterns("/hello"); // 排除某些不需要拦截的请求url（即带有/hello请求不会被拦截）
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
//        需要配置1：----------- 需要告知系统，这是要被当成静态文件的！
//        第一个方法设置访问路径前缀，第二个方法设置资源路径
        registry.addResourceHandler("/**").addResourceLocations("classpath:");
        registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
        registry.addResourceHandler("/images/**").addResourceLocations("classpath:/images/");
        registry.addResourceHandler("/js/**").addResourceLocations("classpath:/js/");
        registry.addResourceHandler("/templates/**").addResourceLocations("classpath:/templates/");
    }

}

然后在从welcome的控制器里面增加一个post方法

package com.example.firstweb.controller;


import com.example.firstweb.exception.CommException;
import com.example.firstweb.model.po.WelcomePo;
import com.example.firstweb.model.vo.WelcomeVo;
import com.example.firstweb.service.WelcomeService;
import com.example.firstweb.util.Constants;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiParam;


import org.apache.log4j.Logger;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
@Api(value = "welcome controller", tags = "欢迎界面")
public class Welcome {

    @Autowired
    private WelcomeService welcomeService;

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

    @GetMapping("/welcomeindex")
    @ApiOperation("欢迎首页的方法1")
    public ModelAndView welcomeIndex(){

        ModelAndView view = new ModelAndView("welcomeindex");


        WelcomePo wpo= welcomeService.getWelcomInfo();

        WelcomeVo wvo= new WelcomeVo();

        BeanUtils.copyProperties(wpo, wvo);

        view.addObject("welcomedata", wvo);


        //默认控制台输出日志
        log.info("default log info ");

        //输出访问日志
        Constants.LOG_ACCESS_INFO.info("welcome index accesss");
        //输出用户阅读日志
        Constants.LOG_USER_READ.info("first user access log ");

        return view;
    }
    @PostMapping("/welcomeindex2")
    @ApiOperation("欢迎首页的方法2")
    public void welcomeIndex2(@ApiParam("定制欢迎词") String test){
    }
}

启动整个工程代码，然后用postman分别GET访问http://localhost:8088/welcomeindex?name=sss&sho=kow 用post访问http://localhost:8088/welcomeindex2
然后在日志文件access.log，分别找到两条日志


程序的源码可以在这里获得链接: https://pan.baidu.com/s/1v23PyXwB4kvxd79jgLurHw 提取码: mkwc