spring boot使用HandlerInterceptorAdapter+WebMvcConfigurerAdapter拦截

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：http://localhost:8080/login/test

输出：
preHandle:/login/test
loginTest
postHandle:/login/test
afterCompletion: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：http://localhost:8080/hello/test

输出：
helloTest

转载于:https://www.cnblogs.com/suwan1125/p/11016971.html

spring boot使用HandlerInterceptorAdapter+WebMvcConfigurerAdapter拦截

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