Spring拦截器

文章目录

Spring拦截器
一，创建拦截器
二，注册拦截器

一，创建拦截器

创建一个拦截器类AdminLoginInterceptor实现HandlerInterceptor接口，重写preHandle方法等。

package com.lmc.interceptor;

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

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

/**
 * @Author lmc
 * @Description 管理员登录拦截器
 * @Date: Create in 15:05 2019/9/4
 */
@Component("adminLoginInterceptor")
public class AdminLoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //获取本次会话的session
        HttpSession session = request.getSession();
        //获取登录时存放在session的账号名
        String aname = (String) session.getAttribute("aname");
        //若账号名为空,则进行拦截
        if (aname != null && !"".equals(aname.trim()))
            return true;
        response.sendRedirect(request.getContextPath() + "/admin/admin/login.html");
        return false;
    }
}

返回true则证明验证成功，通过
返回false则证明验证失败，进行拦截

二，注册拦截器

创建一个类InterceptorConfigurer作为配置类，实现WebMvcConfigurer接口,重写addInterceptors()方法

package com.lmc.config;

import com.lmc.interceptor.AdminLoginInterceptor;
import com.lmc.interceptor.UserHomeInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

/**
 * @Author lmc
 * @Description 配置拦截器
 * @Date: Create in 15:03 2019/9/4
 */
@Configuration
public class InterceptorConfigurer implements WebMvcConfigurer {

    @Autowired
    private AdminLoginInterceptor adminLoginInterceptor;
    @Autowired
    private UserHomeInterceptor userHomeInterceptor;

    // 这个方法是用来配置静态资源的，比如html，js，css，等等
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
    }

    // 这个方法用来注册拦截器，我们自己写好的拦截器需要通过这里添加注册才能生效
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // addPathPatterns("/**") 表示拦截所有的请求，
        // excludePathPatterns("/login", "/register") 表示除了登陆与注册之外，因为登陆注册不需要登陆也可以访问
        registry.addInterceptor(adminLoginInterceptor).
                addPathPatterns("/admin/**").
                excludePathPatterns("/admin/admin/login.html", "/admin/admin/loginAction.do");
        registry.addInterceptor(userHomeInterceptor).addPathPatterns("/user/user/personal.html");
    }


}