springboot之拦截器配置

/**
具体的拦截器实现
*/
package com.java456.util;

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

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

class MyInterceptor implements HandlerInterceptor {


    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object arg2) throws Exception {
        String userName = request.getParameter("userName");
        System.out.println("拦截到用户名"+userName);
        return true;

    }


    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle被调用");
    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        System.out.println("afterCompletion被调用");
    }
}

 

//配置

package com.java456.util;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;



@Configuration
public class MyWebAppConfigurer extends WebMvcConfigurerAdapter {

    @Bean
    public HandlerInterceptor getMyInterceptor(){
        return new MyInterceptor();
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // addPathPatterns 用于添加拦截规则, 这里假设拦截 /url 后面的全部链接
        // excludePathPatterns 用户排除拦截
        registry.addInterceptor(getMyInterceptor()).addPathPatterns("/test/**");
        super.addInterceptors(registry);
    }
}

 

拦截规则参考:https://www.hellojava.com/a/45999.html

增加一个基于正常和异常的判断:

package com.java456.util;

import net.sf.json.JSONObject;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.PrintWriter;


class MyInterceptor implements HandlerInterceptor {


    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object arg2) throws Exception {
        //设置编码格式
        response.setCharacterEncoding("UTF-8");
        response.setContentType("application/json;charset=UTF-8");
        String userName = request.getParameter("userName");
        if(userName.equals("123")){
            return true;
        }else{
            PrintWriter pw = response.getWriter();
            JSONObject obj = new JSONObject();
            obj.put("msg","登录异常");
            pw.write(obj.toString());
            return false;
        }

    }


    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        System.out.println("2");
        System.out.println("postHandle被调用");
    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        System.out.println("3");
        System.out.println("afterCompletion被调用");
    }
}

 

参考:https://www.cnblogs.com/limeiky/p/5851836.html