java拦截器_Java拦截器实现「建议收藏」

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java拦截器实现功能类似于aop功能的实现，实现拦截部分方法，一般用于类似 登录进入A页面，未登录进入B页面

实现方法有两种 实现Interceptor 接口 或者 继承HandlerInterceptorAdapter类，实现接口需要实现其中所有方法，继承抽象类则一般实现preHandle方法即可。

首先配置拦截类

package net.parim.spark.portal.adapter;

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;

@Configuration

public class HomeOpenHandlerConfigration extends WebMvcConfigurerAdapter {

//关键，将拦截器作为bean写入配置中

@Bean

public HomeOpenInterceptor myInterceptor(){

return new HomeOpenInterceptor();

}

@Override

public void addInterceptors(InterceptorRegistry registry) {

registry.addInterceptor(myInterceptor()).addPathPatterns(“/api/open/portal/**”)

.excludePathPatterns(“/api/open/footerInfo”).excludePathPatterns(“/api/open/portal/template/default”);

super.addInterceptors(registry);

}

}

addPathPatterns()方法为需要拦截的api，excludePathPatterns()方法为不需要拦截的接口api

配置拦截逻辑

package net.parim.spark.portal.adapter;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.shiro.SecurityUtils;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Component;

import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import net.parim.spark.common.config.ApplicationProperties;

import net.parim.spark.common.exceptions.BusinessException;

import net.parim.spark.core.system.constant.Constants;

import net.parim.spark.core.system.entity.Site;

import net.parim.spark.core.system.security.UserToken;

import net.parim.spark.core.system.security.exceptions.UnauthenticatedException;

import net.parim.spark.portal.service.PortalCommonService;

/**

* 首页外放拦截器

* @author liweiqiang

*

*/

@Component

public class HomeOpenInterceptor extends HandlerInterceptorAdapter {

@Autowired

private PortalCommonService portalCommonService;

@Autowired

private ApplicationProperties applicationProperties;

@Override

public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)

throws Exception {

//判断是否需要拦截

Boolean flag = false;

if(flag){

//判断是否允许不登录的情况下 访问主页

//如果不允许匿名访问返回401

throw new UnauthenticatedException();

}

//否则允许直接放过，不进行任何拦截

return true;

}

}

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