10.1更 spring boot 登录拦截（附上代码）

声明：

自己对拦截器的理解目前仅处于会用的阶段，没有太多理解，这里仅提供代码，有需要的先拿去用。更多分解等日后再说。

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10.1更新：

spring boot设置拦截器总共就两步：

1. 设置自己的拦截规则。即继承HandlerInterceptor，不用把它注册为bean，因为拦截器只能在拦截器链中。这就要用第二步。
2. 把拦截器添加到拦截器链中。 继承WebMvcConfigurerAdapter。并添加@Configuration注解

目录结构

AuthorizationInterceptor类

//你的拦截规则就要写在这里package com.qingyunqifu.interceptor;import com.qingyunqifu.domain.Users;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class AuthorityIntercptor implements HandlerInterceptor{    //不拦截xxx请求    private static final String[] IGNORE_URL = {"/loginForm", "/login"};    /*    * 本方法在进行处理器拦截用的，该方法在COntroller处理之前进行调用    * 本方法返回值为ture，拦截器才会继续往下执行，该方法返回false时，整个请求就代表结束了。    * */    @Override    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {        System.out.println("在请求处理来之前，也就是在controller函数调用之前");        System.out.println("普通拦截器正在保护您的安全");        //flag 登录标志        boolean flag = false;        //获取请求路径进行判断        String servletPath = httpServletRequest.getServletPath();        for (String s : IGNORE_URL) {            if (servletPath.contains(s)) {                flag = true;                break;            }        }        //拦截请求        if (!flag) {            //获取session中的user            Users user = (Users) httpServletRequest.getSession().getAttribute("user");            if (user == null) {                System.out.println("你好坏，快去登录");                httpServletRequest.setAttribute("message", "请先登录再来");                httpServletRequest.getRequestDispatcher("login").forward(httpServletRequest, httpServletResponse);            }else {                System.out.println("放行！！！");                flag = true;            }        }        return flag;    }    @Override    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {        System.out.println("在请求处理后，但在试图渲染之前调用");    }    @Override    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {        System.out.println("渲染结束后再调用");    }}

WebConfig类

package com.qingyunqifu.interceptor;import org.apache.catalina.filters.RemoteIpFilter;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;import org.springframework.web.servlet.i18n.LocaleChangeInterceptor;@Configurationpublic class WebConfig extends WebMvcConfigurerAdapter {    @Bean    public RemoteIpFilter remoteIpFilter() {        return new RemoteIpFilter();    }    @Bean    public LocaleChangeInterceptor localeChangeInterceptor() {        return new LocaleChangeInterceptor();    }    public void addInterceptors(InterceptorRegistry registry) {        registry.addInterceptor(new AuthorityIntercptor()).addPathPatterns("/**");        super.addInterceptors(registry);    }}

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番外：

附上github地址：https://github.com/1500256797/springboot-demo

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更多关于拦截器的用法，以后有机会再补充进来。