springboot使用拦截器interceptor

1. 实现HandlerInterceptor,重写3个方法并向spring容器添加组件

package com.mqb.springboot02.interceptor;

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

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@Component
public class MyInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("preHandle");
        return HandlerInterceptor.super.preHandle(request, response, handler);
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandler");
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterCompletion");
    }
}

2. 配置拦截器

package com.mqb.springboot02.config;

import com.mqb.springboot02.interceptor.MyInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

import java.util.ArrayList;

@Configuration
public class MyWebMvc extends WebMvcConfigurationSupport {
    @Autowired
    MyInterceptor myInterceptor;
    @Override
    protected void addInterceptors(InterceptorRegistry registry) {
		
        InterceptorRegistration interceptor = registry.addInterceptor(myInterceptor);
	//第一种方式
	interceptor.addPathPatterns("/login");
	//第二种方式
        ArrayList list = new ArrayList<>();
        list.add("/login2");
        interceptor.addPathPatterns(list);
        //这个请求不被拦截
        interceptor.excludePathPatterns("/logout");

    }
}

3. 编写controller测试

package com.mqb.springboot02.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class UserController {
    @RequestMapping("/login")
    public void login(){
        System.out.println("进入到Controller的login方法");
    }
    @RequestMapping("/login2")
    public void login2(){
        System.out.println("进入到Controller的login2方法");
    }

    @RequestMapping("/logout")
    public void logout(){
        System.out.println("进入到Controller的logout方法");
    }
}

4. 启动主程序后，打开浏览器分别访问/login,/login2,/logout,看控制台输出