Spring interceptor拦截器配置及用法解析

fifter、servlet、interceptor

fifter用来处理请求头、请求参数、编码的一些设置，然后转交给servlet，处理业务，返回

servlet现在常用的spring,servlet拦截/到dispatcherservlet，交由spring管理

interceptor,servlet请求之后可以实现handlerinterceptor做到prehandle、posthandle、aftercompletion在controller之前、之后、渲染之后

登陆

业务中常用的登陆、注册，大部分用cookie、session来做，这时候就涉及到拦截判断用户是否登陆、是否有权限？至此引出interceptor：

  package com.bs.interceptor;

import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;

import org.springframework.web.servlet.handlerinterceptor;
import org.springframework.web.servlet.modelandview;

import com.bs.controller.basecontroller;
import com.bs.entity.member;

public class logininterceptor implements handlerinterceptor {

	@override
	public boolean prehandle(httpservletrequest request, httpservletresponse response, object handler)
			throws exception {
		
		member member = basecontroller.getmemberbycookie(request);
		system.out.println(member);
		if(member == null){
			response.sendredirect("/officialweb/login.html"); 
		}
		return false;
	}

	@override
	public void posthandle(httpservletrequest request, httpservletresponse response, object handler,
			modelandview modelandview) throws exception {
		// todo auto-generated method stub

	}

	@override
	public void aftercompletion(httpservletrequest request, httpservletresponse response, object handler, exception ex)
			throws exception {
		// todo auto-generated method stub
	}
}

java代码如上,然后在servlet.xml中配置如下：

 <!-- 拦截器 --> 
 <!--     多个拦截器，顺序执行 -->
  <mvc:interceptors> 
     <mvc:interceptor> 
      <mvc:mapping path="/**"/>
      <mvc:exclude-mapping path="/**/cloud/**" />
      <mvc:exclude-mapping path="/**/login/**" />
      <bean class="com.bs.interceptor.logininterceptor"></bean> 
    </mvc:interceptor> 
  </mvc:interceptors>

mvc:mapping拦截的path地址,mvc:exclude-mapping不拦截的path地址，比如一些登陆、注册、验证码、和可以不登录操作的接口。

至此结束。

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