本文共 7123 字，大约阅读时间需要 23 分钟。

package com.example.mongodemo.config;import lombok.extern.slf4j.Slf4j;import org.springframework.stereotype.Component;import org.springframework.web.method.HandlerMethod;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * @Author lyr * @create 2020/3/24 1:18 * 拦截器 * 要在 webMvcConfiguration注册 */@Slf4j@Componentpublic class WebInterceptor implements HandlerInterceptor {
       @Override    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
           log.info("开始");        //打印对应 处理请求的 Controller类        log.info(((HandlerMethod)handler).getBean().getClass().getName());        return true;    }    @Override    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
           log.info("运行中");    }    @Override    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
           log.info("结束");        //抛出异常的话 会有 ex参数    }}

然后 要在配置上面注册一下这个拦截器

package com.example.mongodemo.config;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.web.servlet.config.annotation.InterceptorRegistry;import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;/** * @Author lyr * @create 2020/3/23 19:53 */@Configuration //标注时配置类public class MvcConfig implements WebMvcConfigurer {
       @Autowired    private WebInterceptor interceptor;    @Override    public void addInterceptors(InterceptorRegistry registry) {
           registry.addInterceptor(interceptor);    }    @Bean    public MvcConfig MyMvcConfig() {
           MvcConfig mvcConfig = new MvcConfig() {
               @Override            public  void addResourceHandlers(ResourceHandlerRegistry registry) {
                   registry.addResourceHandler("swagger-ui.html")                        .addResourceLocations("classpath:/META-INF/resources/");                registry.addResourceHandler("/webjars/**")                        .addResourceLocations("classpath:/META-INF/resources/webjars/");            }        };        return mvcConfig;    }}

package com.lyr.cakemanagerv2.config;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.web.servlet.config.annotation.InterceptorRegistry;import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;import javax.annotation.Resource;/** * @Author lyr * @create 2020/7/30 11:27 */@Configuration //标注时配置类public class WebConfig implements WebMvcConfigurer {
       @Resource    private TokenInterceptor interceptor;    @Override    public void addInterceptors(InterceptorRegistry registry) {
           registry.addInterceptor(interceptor)                .addPathPatterns("/**")                .excludePathPatterns("/test");    }    @Bean    public WebConfig MyMvcConfig() {
           return new WebConfig();    }}

拦截器

package com.lyr.cakemanagerv2.config;import dto.Result;import lombok.extern.slf4j.Slf4j;import org.springframework.stereotype.Component;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;import token.JWTCode;import token.JwtUtil;import util.web.WebUtil;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * @Author lyr * @create 2020/7/29 23:10 */@Slf4j@Componentpublic class TokenInterceptor  implements HandlerInterceptor {
       @Override    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
           setHeader(httpServletResponse);        String token = httpServletRequest.getHeader("token");        String uri =  httpServletRequest.getRequestURI();        log.info("{} -> {}",httpServletRequest.getMethod(),uri );        try{
               JWTCode code = JwtUtil.judgeToken(token);            switch (code) {
                   case OVERDUE:{
                       Result

前后端分离跨域问题

跨域问题也可以用过滤器来解决

package com.lyr.cakemanagerv2.config;import org.springframework.stereotype.Component;import javax.servlet.*;import javax.servlet.http.HttpServletResponse;import java.io.IOException;/** * @Author lyr * @create 2020/7/21 14:38 */@Componentpublic class WebFilter implements Filter {
       @Override    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
           setHeader((HttpServletResponse) res);        chain.doFilter(req, res);    }    private void setHeader(HttpServletResponse res) {
           HttpServletResponse response = (HttpServletResponse) res;        response.setHeader("Access-Control-Allow-Origin", "*");        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, HEAD");        response.setHeader("Access-Control-Max-Age", "3600");        response.setHeader("Access-Control-Allow-Headers", "access-control-allow-origin, authority, content-type, version-info, X-Requested-With");    }}

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