SpringBoot2.X拦截器使用(登录或则权限控制)

1.新建拦截器配置类: WebMvcConfigurer

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.WebMvcConfigurer;

/**
 * 拦截器配置类
 */
@Configuration
class CustomWebMvcConfigurer implements WebMvcConfigurer {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(getLoginInterceptor()).addPathPatterns("/api/v1/pri/**");
        registry.addInterceptor(new DeleteIntercepter()).addPathPatterns("/api/v1/pri/delete/**");
    }
    @Bean
    public LoginIntercepter getLoginInterceptor(){
        return new LoginIntercepter();
    }
}

2.登录拦截

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;

public class LoginIntercepter implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("LoginIntercepter.preHandle");

        String token= request.getHeader("token");
        if (token == null) {
            response.sendError(-1, "请您登录后操作！");
            return false;
        } else {
            try {
                if (token不合法) {
                    response.sendError(-1, "登录token不合法，请重新登录！");
                    return false;
                } else {
                    return true;//token验证通过
                }

            } catch (Exception e) {
                return false;
            }
        }
//        return HandlerInterceptor.super.preHandle(request, response, handler);
    }

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

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

3.删除权限控制

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;

public class DeleteIntercepter implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("DeleteIntercepter.preHandle");
        //权限判断
        if("无权操作"){
            response.sendError(-1,"您没有权限删除！");
            return false;
        }
        return HandlerInterceptor.super.preHandle(request,response,handler);
    }

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

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

4.拦截器器不不⽣生效常⻅见问题：

- 是否有加@Configuration
- 拦截路路径是否有问题 ** 和 *
- 拦截器器最后路路径⼀一定要 /** 如果是⽬目录的话则是 /*/

5.如何配置不不拦截某些路路径？

registry.addInterceptor(new
LoginIntercepter()).addPathPatterns("/api/v1/pri/**")
//配置不不拦截某些路路径，⽐比如静态资源
.excludePathPatterns("/**/*.html","/**/*.js");

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