springmvc自己定义拦截器

Spring MVC也能够使用拦截器对请求进行拦截处理，用户能够自己定义拦截器来实现特定的功能，自己定义的拦截器必须实现HandlerInterceptor接口。

直接看下样例：

package com.ztz.springmvc.interceptor;

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{

	/**
	 * 业务处理器处理之前被调用。被拦截返回false，反之能正常到Controller层
	 */
	@Override
	public boolean preHandle(HttpServletRequest request,
			HttpServletResponse response, Object handler) throws Exception {
		System.out.println("====preHandle====");
		//假设返回false将不会到Controller层
		return true;
	}

	/**
	 * 在业务处理完毕请求后。在DispatcherServlet向client返回响应前被调用
	 */
	@Override
	public void postHandle(HttpServletRequest request,
			HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {
		System.out.println("======postHandle=====");
	}

	/**
	 * 在DispatcherServlet全然处理完请求后被调用(能够在该方法进行一些资源的清理操作)
	 */
	@Override
	public void afterCompletion(HttpServletRequest request,
			HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
		System.out.println("=====afterCompletion=======");
	}

}

package com.ztz.springmvc.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping("/interceptor")
public class MyInterceptorController {
	@RequestMapping("/inter1")
	private String interceptor1(){
		System.out.println("=====inter1=====");
		return "index";
	}
	@RequestMapping("/inter2")
	private String interceptor2(){
		System.out.println("======inter2=====");
		return "index";
	}
}

<!--默认的mvc注解映射的支持 -->
	<mvc:annotation-driven />
	<!-- 处理对静态资源的请求 -->
	<mvc:resources location="/static/" mapping="/static/**" />
	<!-- 扫描注解 -->
	<context:component-scan base-package="com.ztz.springmvc.controller" />
	<!-- 视图解析器 -->
	<bean
		class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="viewClass"
			value="org.springframework.web.servlet.view.JstlView" />
		<!-- 前缀 -->
		<property name="prefix" value="/WEB-INF/jsp/" />
		<!-- 后缀 -->
		<property name="suffix" value=".jsp" />
	</bean>

	<!-- 拦截器配置 -->
	<mvc:interceptors>
		<!-- 多个拦截器,顺序运行 -->
		<mvc:interceptor>
			<!-- 须要拦截的url -->
			<mvc:mapping path="/interceptor/*" />
			<!-- 拦截器实现类 -->
			<bean class="com.ztz.springmvc.interceptor.MyInterceptor" />
		</mvc:interceptor>
	</mvc:interceptors>

浏览器请求：http://127.0.0.1:8080/springmvc/interceptor/inter1

控制台输出：

====preHandle====

=====inter1=====

======postHandle=====

=====afterCompletion=======

我们看到<mvc:mapping path="/interceptor/*" />拦截的是/interceptor/路径下全部的请求，那么如今我不想拦截 /interceptor/inter2这个请求怎么办。这个非常好实现的。仅仅须要加一个配置。

	<!-- 拦截器配置 -->
	<mvc:interceptors>
		<!-- 多个拦截器,顺序运行 -->
		<mvc:interceptor>
			<!-- 须要拦截的url -->
			<mvc:mapping path="/interceptor/*" />
			<!-- 不拦截该请求 -->
			<mvc:exclude-mapping path="/interceptor/inter2"/>
			<!-- 拦截器实现类 -->
			<bean class="com.ztz.springmvc.interceptor.MyInterceptor" />
		</mvc:interceptor>
	</mvc:interceptors>

浏览器请求：http://127.0.0.1:8080/springmvc/interceptor/inter2

控制台输出：

======inter2=====

PS:本demo地址：http://download.csdn.net/detail/zwz568017880/9043089