SpringMVC拦截器配置

本是古典何须时尚 2023-06-15 04:55 2阅读 0赞

Spring MVC中的拦截器（Interceptor）类似于Servlet中的过滤器（Filter），它主要用于拦截用户请求并作相应的处理。例如通过拦截器可以进行权限验证、记录请求信息的日志、判断用户是否登录等。

使用拦截器的步骤如下：

第一步：添加一个拦截器的类 实现HandlerInterceptor接口

package org.cjr.interceptor.copy;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import org.springframework.web.servlet.HandlerInterceptor;
    import org.springframework.web.servlet.ModelAndView;
    
    public class MyInterceptor implements HandlerInterceptor {
    
    	@Override
    	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
    			throws Exception {
    		System.out.println("拦截请求");
    		// true 代表拦截后 放行 ， false 代表请求终止
    		return  true;
    	}
    	
    	@Override
    	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
    			ModelAndView modelAndView) throws Exception {
    		System.out.println("拦截响应");
    		HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    	}
    	
    	@Override
    	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
    			throws Exception {
    		System.out.println("渲染完成");
    		HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    	}
    }

第二步：xml 配置拦截器

<mvc:interceptors >
    
      <mvc:interceptor>
    
        <mvc:mapping path=""/>
    
        <mvc:exclude-mapping path=""/>  
        <bean class="org.cjr.interceptor.copy.MyInterceptor"></bean>
      </mvc:interceptor>
    
    </mvc:interceptors>

测试结果：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyMTM5ODg5_size_16_color_FFFFFF_t_70][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyMTM5ODg5_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20191120140608319.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyMTM5ODg5,size_16,color_FFFFFF,t_70