SpringBoot 拦截器

续 页面国际化

创建一个拦截器实现HandlerInterceptor接口

package com.xiaoyequ.config;

import org.springframework.web.servlet.HandlerInterceptor;

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


public class LoginHandlerInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //登录成功，应该有用户的session
        Object loginUser = request.getSession().getAttribute("loginUser");
        if (loginUser == null) {
            request.setAttribute("msg", "没有权限，清先登录");
            request.getRequestDispatcher("/index.html").forward(request,response);
            return false;
        }else {
            return true;
        }
    }

}

新建配置类来管理拦截器，并将之前的拦截器注入其中

package com.xiaoyequ.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

//扩展springmvc
@Configuration
public class MyMvcConfig implements WebMvcConfigurer {

    // 拦截器配置
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new LoginHandlerInterceptor())
                .addPathPatterns("/**")     // 可以拦截所有请求
                .excludePathPatterns("/index.html","/","/user/login","/css/**","/js/**","/img/**");     // 排除访问路径
    }

}

同时控制类里：添加 HttpSession 对象

package com.xiaoyequ.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.thymeleaf.util.StringUtils;

import javax.servlet.http.HttpSession;

@Controller
@RequestMapping("user")
public class LoginController {
    @RequestMapping("login")
    public String login(@RequestParam("username") String username,
                        @RequestParam("password") String password,
                        Model model,
                        HttpSession session) {
        if (!StringUtils.isEmpty(username) && "123123".equals(password)) {
            session.setAttribute("loginUser", username);
            return "redirect:/main.html";
        } else {
            model.addAttribute("msg", "用户名或密码错误");
            return "index";
        }
    }

}

thymeleaf 中用

[[${session.loginUser}]] 

接收