springboot之攔截器配置

/**
具體的攔截器實現
*/
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("攔截到用戶名"+userName);
        return true;

    }


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

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

 

//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 用於添加攔截規則, 這裏假設攔截 /url 後面的全部鏈接
        // excludePathPatterns 用戶排除攔截
        registry.addInterceptor(getMyInterceptor()).addPathPatterns("/test/**");
        super.addInterceptors(registry);
    }
}

 

攔截規則參考:https://www.hellojava.com/a/45999.html

增加一個基於正常和異常的判斷:

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 {
        //設置編碼格式
        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","登錄異常");
            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被調用");
    }

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

 

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