【JAVAWEB-Springboot的运用】第六章 拦截器的使用_pig 拦截器

只需两个类即可配置拦截器

1. 实现AsyncHandlerInterceptor或HandlerInterceptor，这里也可以做一些跨域设置

package com.demo.bootweb.interceptor;

import org.springframework.lang.Nullable;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.AsyncHandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

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

@Component
public class DemoInterceptor implements AsyncHandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String uri = request.getServletPath();
        //拦截器可以用于日志记录、监控、检查权限、以及存储请求头一些公用的信息等等
        //这里只是一个测试。拦截pig请求并转发到dog下
        if("/hello/pig".equals(uri)) {
            request.getRequestDispatcher("/hello/dog").forward(request, response);
            return false;
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable ModelAndView modelAndView) throws Exception {
        //这里可以解决一些跨域问题
        response.setHeader("Access-Control-Allow-Headers", request.getHeader("Access-Control-Request-Headers"));
        response.setHeader("Access-Control-Allow-Methods", "GET, HEAD, POST, PUT, DELETE, TRACE, OPTIONS, PATCH");
        response.setHeader("Access-Control-Allow-Origin", "*");
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable Exception ex) throws Exception {

    }
}

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2. 实现WebMvcConfigurer，并配置拦截器同时可设置静态资源拦截

package com.demo.bootweb.config;

import com.demo.bootweb.interceptor.DemoInterceptor;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.web.filter.CharacterEncodingFilter;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
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.nio.charset.StandardCharsets;

@Configuration
@EnableWebMvc
public class WebMvcConfigureAdapter implements WebMvcConfigurer {

    @Resource
    private DemoInterceptor demoInterceptor;

    /**
     * 配置访问拦截器
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(demoInterceptor)
                //拦截路径设置
                .addPathPatterns("/**")
                //不拦截的路径设置
                .excludePathPatterns("/public/**")
                .excludePathPatterns("/error/**")
                .excludePathPatterns("/static/**")
                .excludePathPatterns("/logout")
                .excludePathPatterns("/login");
    }

    /**
     * 配置访问静态资源
     * 全部交由拦截器控制
     */
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry){
        registry.addResourceHandler("/**");
        registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
    }

    @Bean
    public FilterRegistrationBean<CharacterEncodingFilter> filterRegistrationBean() {
        FilterRegistrationBean<CharacterEncodingFilter> registrationBean = new FilterRegistrationBean<>();
        CharacterEncodingFilter characterEncodingFilter = new CharacterEncodingFilter();
        characterEncodingFilter.setForceEncoding(true);
        characterEncodingFilter.setEncoding("UTF-8");
        registrationBean.setFilter(characterEncodingFilter);
        return registrationBean;
    }

    @Bean
    public HttpMessageConverter<String> responseBodyConverter() {
        return new StringHttpMessageConverter(StandardCharsets.UTF_8);
    }

}

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测试结果图

如图，访问pig被成功拦截到了dog。

晚安！