本篇内容主要讲解“SpringMVC拦截器的作用是什么”,感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷,实用性强。下面就让小编来带大家学习“SpringMVC拦截器的作用是什么”吧!
web.xml文件
springMVC配置文件:
controller类:
第一个拦截器配置:
第二个拦截器:
总结
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> <!-- 配置springMvc中央处理器--> <servlet> <servlet-name>springMVC</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <!-- 初始化的时候配置加载springmvc的配置文件--> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring-mvc.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <!-- 3、修改web.xml中的请求路径地址方式--> <servlet-mapping> <servlet-name>springMVC</servlet-name> <!-- 3、修改web.xml中的请求路径地址方式--> <url-pattern>/</url-pattern> <!-- <url-pattern>*.do</url-pattern>--> </servlet-mapping> <!-- 1、将css文件使用默认处理方式进行处理,不再交由中央控制器处理, 设置路径的更高匹配优先级 --> <!-- <servlet-mapping>--> <!-- <servlet-name>default</servlet-name>--> <!-- <url-pattern>*.css</url-pattern>--> <!-- <url-pattern>*.js</url-pattern>--> <!-- <url-pattern>*.jpg</url-pattern>--> <!-- <url-pattern>*.png</url-pattern>--> <!-- <url-pattern>*.html</url-pattern>--> <!-- </servlet-mapping>--> </web-app>
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <!--自动扫描包--> <!-- 开启ioc 注解事务支持--> <context:component-scan base-package="cn"></context:component-scan> <!--开启spiring mvc注解支持--> <mvc:annotation-driven></mvc:annotation-driven> <!--配置spring 中的视图解析器--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="resolver"> <property name="prefix" value="/"></property> <property name="suffix" value=".jsp"></property> </bean> <mvc:interceptors> <bean id="interceptor1" class="cn.hp.interceptor.TestInterceptor1"></bean> <mvc:interceptor> <mvc:mapping path="/**"/> <bean id="interceptor1" class="cn.hp.interceptor.TestInterceptor1"></bean> </mvc:interceptor> <mvc:interceptor> <mvc:mapping path="/test1.do"/> <mvc:exclude-mapping path="/test2.do"/> <bean id="interceptor2" class="cn.hp.interceptor.TestInterceptor2"></bean> </mvc:interceptor> </beans>
package cn.hp.action; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import javax.servlet.http.HttpSession; @Controller public class UserAction { @RequestMapping("/test1.do") public String test01(){ System.out.println("正在执行test1这个业务逻辑"); return "index"; } @RequestMapping("/test2.do") public String test02(){ System.out.println("正在执行test2这个业务逻辑"); return "index"; } }
package cn.hp.interceptor; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class TestInterceptor1 implements HandlerInterceptor { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { System.out.println("第一个拦截器,执行业务逻辑之前执行此方法"); return true; } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { System.out.println("第一个拦截器,执行业务逻辑之后,视图渲染之前执行此方法"); } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { System.out.println("第一个拦截器,执行视图渲染之后执行此方法"); } }
package cn.hp.interceptor; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class TestInterceptor2 implements HandlerInterceptor { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { System.out.println("第二个拦截器,执行业务逻辑之前执行此方法"); return true; } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { System.out.println("第二个拦截器,执行业务逻辑之后,视图渲染之前执行此方法"); } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { System.out.println("第二个拦截器,执行视图渲染之后执行此方法"); } }
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