SpringMVC拦截器之拦截器接口方法演示

SpringMVC拦截器之拦截器接口方法演示

1.编写自定义拦截器的代码如下：

package com.txw.controller.interceptor;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 *自定义拦截器
 * @author Adair
 */
@SuppressWarnings("all")      // 注解警告信息
public class MyInterceptor1 implements HandlerInterceptor {
    
    
    /**
     * 预处理，controller方法执行前
     * return true 放行，执行下一个拦截器，如果没有，执行controller中的方法
     * return false不放行
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    
    
        System.out.println("MyInterceptor1执行了...前1111");
        // 跳转页面
        // request.getRequestDispatcher("/WEB-INF/pages/error.jsp").forward(request,response);
        return true;
    }
    /**
     * 后处理方法，controller方法执行后，success.jsp执行之前
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
    
    
        System.out.println("MyInterceptor1执行了...后1111");
        // request.getRequestDispatcher("/WEB-INF/pages/error.jsp").forward(request,response);
    }
    /**
     * success.jsp页面执行后，该方法会执行
     * @param request
     * @param response
     * @param handler
     * @param ex
     * @throws Exception
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
    
    
        System.out.println("MyInterceptor1执行了...最后1111");
    }
}

2.使用Tomcat服务运行如图所示：
3.通过浏览器访问http://localhost:8080/如图所示：
4.控制台打印结果如图所示：
5.编写自定义拦截器的代码如下：

package com.txw.controller.interceptor;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 *自定义拦截器
 * @author Adair
 */
@SuppressWarnings("all")      // 注解警告信息
public class MyInterceptor2 implements HandlerInterceptor {
    
    
    /**
     * 预处理，controller方法执行前
     * return true 放行，执行下一个拦截器，如果没有，执行controller中的方法
     * return false不放行
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    
    
        System.out.println("MyInterceptor1执行了...前1111");
        // 跳转页面
        // request.getRequestDispatcher("/WEB-INF/pages/error.jsp").forward(request,response);
        return true;
    }
    /**
     * 后处理方法，controller方法执行后，success.jsp执行之前
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
    
    
        System.out.println("MyInterceptor1执行了...后2222");
        // request.getRequestDispatcher("/WEB-INF/pages/error.jsp").forward(request,response);
    }
    /**
     * success.jsp页面执行后，该方法会执行
     * @param request
     * @param response
     * @param handler
     * @param ex
     * @throws Exception
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
    
    
        System.out.println("MyInterceptor1执行了...最后2222");
    }
}

6.配置springmvc.xml的代码如下：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">
    <!-- 开启注解扫描 -->
    <context:component-scan base-package="com.txw"/>
    <!-- 视图解析器对象 -->
    <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
    <!--前端控制器，哪些静态资源不拦截-->
    <mvc:resources location="/css/" mapping="/css/**"/>
    <mvc:resources location="/images/" mapping="/images/**"/>
    <mvc:resources location="/js/" mapping="/js/**"/>
    <!--配置拦截器-->
    <mvc:interceptors>
        <!--配置拦截器-->
        <mvc:interceptor>
            <!--要拦截的具体的方法-->
            <mvc:mapping path="/user/*"/>
            <!--不要拦截的方法-->
            <!--<mvc:exclude-mapping path=""/>-->
            <!--配置拦截器对象-->
            <bean class="com.txw.controller.interceptor.MyInterceptor1"/>
        </mvc:interceptor>
        <!--配置第二个拦截器-->
        <mvc:interceptor>
            <!--要拦截的具体的方法-->
            <mvc:mapping path="/**"/>
            <!--不要拦截的方法-->
            <!--<mvc:exclude-mapping path=""/>-->
            <!--配置拦截器对象-->
            <bean class="com.txw.controller.interceptor.MyInterceptor2"/>
        </mvc:interceptor>
    </mvc:interceptors>
    <!-- 开启SpringMVC框架注解的支持 -->
    <mvc:annotation-driven />
</beans>

7.运行结果如图所示：
证明配置多个拦截器已成功！