springboot整合拦截器登录验证

水深无声 2023-07-15 13:09 54阅读 0赞

# springboot整合拦截器，登录验证 #

## 定义拦截器 ##

拦截器与spring mvc拦截器实现方式一致，继承HandlerInterceptorAdapter类，代码如下

package com.xiaomin.springboot_login.interceptor;
    
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import javax.servlet.http.HttpSession;
    
    /** * @author 晓敏 * @create 2020-03-16 16:26 */
    @Configuration
    public class LoginInterceptor extends HandlerInterceptorAdapter { 
    
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { 
            System.out.println("拦截你");
            String uri = request.getRequestURI();
            System.out.println(uri);
            if(uri.equals("/login2")|| uri.equals("/tologin")){ 
                return true;
            }
            HttpSession session = request.getSession();
            Object user = session.getAttribute("user");
            if(user!=null){ 
                return true;
            }
            request.getRequestDispatcher("/WEB-INF/jsp/login.jsp").forward(request, response);
            return false;
        }
    }

## 定义配置类 ##

package com.xiaomin.springboot_login.config;
    
    import com.xiaomin.springboot_login.interceptor.LoginInterceptor;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
    
    /** * @author 晓敏 * @create 2020-03-16 16:58 */
    @Configuration
    public class WebMvcConfigurer extends WebMvcConfigurationSupport { 
        @Override
        protected void addInterceptors(InterceptorRegistry registry) { 
            registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/**");
        }
    }

## 登录页 ##

<%--
      Created by IntelliJ IDEA.
      User: Administrator
      Date: 2020-3-16
      Time: 16:20
      To change this template use File | Settings | File Templates.
    --%>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>Title</title>
    </head>
    <body>
    <h1>登录</h1>
    <form action="/login2" method="post">
        账号：<input type="text" name="username"/><br/>
        密码：<input type="password" name="password"/><br/>
        <input type="submit" value="提交"/>
    </form>
    </body>
    </html>

## LoginController控制器 ##

@RequestMapping("/login2")
        public void login2(HttpServletRequest request, HttpServletResponse response,String username, String password) throws Exception{ 
           if(username=="" || password==""){ 
                throw  new UserException("用户名或密码为空");
            }
            User user = userService.getOne(new QueryWrapper<User>().eq("username", username));
            if(user==null){ 
                throw new UserException("用户不存在");
            }
            if(!password.equals(user.getPassword())){ 
                throw new UserException("密码错误");
            }
            request.getSession().setAttribute("user",user);
            request.setAttribute("username",user.getUsername());
            request.getRequestDispatcher("/WEB-INF/jsp/success.jsp").forward(request,response);
        }

## 注意事项 ##

因为配置了拦截器，需要在springboot启动器上添加这个，不然访问不到页面

/** * 配置JSP视图解析器 * 如果没有配置视图解析器。Spring会使用BeanNameViewResolver，通过查找ID与逻辑视图名称匹配且实现了View接口的beans * * @return */
        @Bean
        public InternalResourceViewResolver setupViewResolver() { 
            InternalResourceViewResolver resolver = new InternalResourceViewResolver();
            //设置视图路径的前缀
            resolver.setPrefix("/WEB-INF/jsp/");
            //设置视图路径的后缀
            resolver.setSuffix(".jsp");
            return resolver;
        }

## 目录结构 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4NTU1NDkw_size_16_color_FFFFFF_t_70_pic_center]

## 演示结果 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4NTU1NDkw_size_16_color_FFFFFF_t_70_pic_center 1]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4NTU1NDkw_size_16_color_FFFFFF_t_70_pic_center 2]  
退出系统后直接去首页，被拦截，打回登录页喽，拦截器案例成功。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4NTU1NDkw_size_16_color_FFFFFF_t_70_pic_center 3]

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4NTU1NDkw_size_16_color_FFFFFF_t_70_pic_center 2]: /images/20230528/b7d17caea2024aa88d1d622d2d8acc73.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4NTU1NDkw_size_16_color_FFFFFF_t_70_pic_center 3]: /images/20230528/8bf437c69d224c0991a4bdc674cc999e.png