springMVC自定义拦截器（Interceptor）实现登陆验证

港控/mmm° 2022-03-22 12:25 236阅读 0赞

# 1.为什么要登陆拦截 #

在未登录之前，我们并不希望用户可以看见里面的内容，这时候就要设置拦截器，只有登陆之后的用户才可以看见里面的内容。

# 2.实现思路 #

使用拦截器，判断session里是否有用户信息，若有，则放行，若没有，则重定向到登陆页面。

# 3.springMVC配置 #

<mvc:interceptors>
            <mvc:interceptor>
                <mvc:mapping path="/**"/>
                <mvc:exclude-mapping path="/home/**"></mvc:exclude-mapping>
                <mvc:exclude-mapping path="/**/*.css"/>
                <mvc:exclude-mapping path="/**/*.js"/>
                <mvc:exclude-mapping path="/**/*.png"/>
                <mvc:exclude-mapping path="/**/*.gif"/>
                <mvc:exclude-mapping path="/**/*.jpg"/>
                <mvc:exclude-mapping path="/**/*.jpeg"/>
                <mvc:exclude-mapping path="/registerUser"></mvc:exclude-mapping>
                <mvc:exclude-mapping path="/checkId"></mvc:exclude-mapping>
                <mvc:exclude-mapping path="/register"></mvc:exclude-mapping>
                <bean class="com.sustly.interceptors.LoginInterceptor"></bean>
            </mvc:interceptor>
        </mvc:interceptors>

配置拦截所有请求，除了登陆注册页面以及静态资源文件。

# 4.Interceptor类编写 #

public class LoginInterceptor implements HandlerInterceptor {
    
    
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object o) throws Exception {
    
                String id  = (String) request.getSession().getAttribute("id");
                if(id == null) {
                    response.sendRedirect("/home/login");
                    return false;
                }else {
                    return true;
                }
        }
    
        public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
    
        }
    
        public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
    
        }
    }

springMVC自定义拦截器（Interceptor）实现登陆验证

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