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!