后端开发5——springboot添加拦截器

1 添加拦截器配置config——InterceptorConfig

拦截器配置类用于在服务启动时配置拦截器。

点击展开

package com.ruoyi.trustedAsset.config;

import com.ruoyi.trustedAsset.interceptor.AuthorityInterceptor;
import …

@Configuration
public class InterceptorConfig extends WebMvcConfigurationSupport {
    @Bean
    public AuthorityInterceptor loginInterceptor(){
        return new AuthorityInterceptor();
    }
    @Override
    protected void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(loginInterceptor())
                .addPathPatterns("/**") // 要拦截的请求
                .excludePathPatterns("/trustedAsset/getBlocks");  // 不拦截的请求
        super.addInterceptors(registry);
    }
}

2 添加拦截器interceptor——xxxInterceptor

拦截器的实现类。

点击展开

package com.wrj.interceptor;

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

public class AuthorityInterceptor implements HandlerInterceptor {
    //controller方法调用之前执行
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //获取请求头中的token
        String token= request.getHeader("Authorization");
        if(token==null){
            response.setContentType("application/json; charset=utf-8");
            response.getWriter().write("无访问权限");
            return false;
        }
        System.out.println("权限拦截器");
        return true;
    }
    //controller方法处理完成后执行
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
                           ModelAndView modelAndView) throws Exception {
        System.out.println("拦截后执行");
    }
}

说明：preHandle返回true则会继续执行controller方法，返回false则会直接返回请求错误信息。