如何在SpringBoot项目中使用拦截器

相比springmvc，springboot中拦截器不需要在xml中配置，只需定义拦截器类 implements HandlerInterceptor

和拦截器拦截路径的配置类extends WebMvcConfigurerAdapter

1.SessionInterceptor

package com.example.demo;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

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

/**
 * Created by 20160216 on 2018/2/8.
 */
public class SessionInterceptor implements HandlerInterceptor
{
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object o) throws Exception {
        System.out.println("uri="+request.getRequestURI());
        //登录不做拦截
        if(request.getRequestURI().equals("/userbg/login") || request.getRequestURI().equals("/user/login_view"))
        {
            return true;
        }
        //验证session是否存在
        Object obj = request.getSession().getAttribute("_session_user");
        if(obj == null)
        {
            response.sendRedirect("/user/login_view");
            return false;
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {

    }
}

2.SessionConfiguration

package com.example.demo;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

/**
 * Created by 20160216 on 2018/2/8.
 */
@Configuration
public class SessionConfiguration extends WebMvcConfigurerAdapter
{
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new SessionInterceptor()).addPathPatterns("/**");
    }
}