SpringMVC拦截器详解

<?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*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*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");
    }
}