spring 拦截器简单实现

最新推荐文章于 2023-09-14 13:49:07 发布

原创最新推荐文章于 2023-09-14 13:49:07 发布 · 198 阅读

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本文详细介绍了如何在Spring MVC框架中实现自定义拦截器，包括创建实现HandlerInterceptor接口的拦截器类，并通过WebMvcConfigurerAdapter进行配置，以及如何在特定路径下应用拦截器。

一、自定义拦截器实现HandlerInterceptor接口。

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;

@Component
@Slf4j
public class MyInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
        //拦截器可以设置或修改某些参数
        httpServletRequest.setAttribute("key","value");
        HandlerMethod handlerMethod = (HandlerMethod)o;
        log.info("beanName:"+handlerMethod.getBean().getClass() );
        log.info("methodName:"+handlerMethod.getMethod() );
        //拦截器将请求转发
        httpServletRequest.getRequestDispatcher("/test").forward(httpServletRequest,httpServletResponse);
        return false;
    }
    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        log.info("postHandle--------");
    }
    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        log.info("afterCompletion-------");
    }
}

二、定义一个继承WebMvcConfigurerAdapter的类，重写addInterceptors方法。

import com.web.filter.MyFilter;
import com.web.interceptor.MyInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
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.WebMvcConfigurerAdapter;

import java.util.ArrayList;
import java.util.List;

/**
 *
 * @author cherrytang
 */
@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {

    private final MyInterceptor myInterceptor;

    @Autowired
    public WebConfig(MyInterceptor myInterceptor) {
        this.myInterceptor = myInterceptor;
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(myInterceptor).addPathPatterns("/hello");
    }

    /**
     * 过滤器配置
     * @return FilterRegistrationBean
     */
    @Bean
    public FilterRegistrationBean timeFilter(){
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
        MyFilter myFilter = new MyFilter();
        List<String> urls = new ArrayList<>();
        urls.add("/test");
        filterRegistrationBean.setUrlPatterns(urls);
        filterRegistrationBean.setFilter(myFilter);
        return filterRegistrationBean;
    }
}