spring boot使用HandlerInterceptorAdapter+WebMvcConfigurerAdapter拦截-白红宇

spring boot使用HandlerInterceptorAdapter+WebMvcConfigurerAdapter拦截

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发布时间：2019-06-29

本文共 3169 字，大约阅读时间需要 10 分钟。

最近在做考试系统，是个微信小程序，页面都是前端那里做好的，数据都是调的后端接口，自然后端就使用到了拦截器。时间有点紧，这篇只是大概写个结构，以后再补。

1.HandlerInterceptorAdapter

preHandle 业务处理器在处理业务之前被调用，预处理。

postHandle 在业务处理之后调用，后处理，

afterCompletion 在DispatcherServlet完全处理完请求后被调用，可用于清理资源。也可以根据ex是否为null来判断是否发生了异常。

import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * @author suwan */public class LoginInterceptor extends HandlerInterceptorAdapter {    @Override        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {            String url = request.getRequestURI().toString();            System.out.println("preHandle:" + url);        return true;    }    @Override    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {        String url = request.getRequestURI().toString();        System.out.println("postHandle:" + url);        super.postHandle(request, response, handler, modelAndView);    }    @Override    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {        System.out.println("afterCompletion:" + ex);        super.afterCompletion(request, response, handler, ex);    }}

2.WebMvcConfigurerAdapter添加拦截器

addInterceptors 需要一个实现HandlerInterceptor接口的拦截器实例

addPathPatterns 用于设置拦截器的过滤路径规则

excludePathPatterns：用于设置不需要拦截的过滤规则

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;/** * @author suwan */@Configuration    public class InterceptorConfig extends WebMvcConfigurerAdapter {    @Override    public void addInterceptors(InterceptorRegistry registry) {        registry.addInterceptor(loginInterceptor()).addPathPatterns("/login/**").excludePathPatterns("/hello/**");    }    @Bean    public LoginInterceptor loginInterceptor(){
   return new LoginInterceptor();}}

3.测试设置拦截器的路径

import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;/** * @author suwan */@RestController@RequestMapping("/login")public class UserController {    @GetMapping("/test")    public void test(){        System.out.println("loginTest");    }}

浏览器请求：

输出：preHandle:/login/testloginTestpostHandle:/login/testafterCompletion:null

4.测试未设置拦截的路径

import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;/** * @author suwan * @date 2019/6/13 */@RestController@RequestMapping("/hello")public class HelloController {    @GetMapping("/test")    public  void  test(){        System.out.println("helloTest");    }}

浏览器请求：