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拦截器

拦截器是SpringMVC框架自己的,只用SpringMVC才能使用
拦截器只会拦截访问的控制方法,静态资源是不会拦截的

定义拦截器

实现HandlerInterceptor
其实只要使用preHandle就可以了,他返回true才执行,否则不执行
比如我们就可以在这里实现登陆请求

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package com.onlineStore.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 MyInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
return true;
}

@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

}

@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

}
}

文件上传和下载

MultipartResolver

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<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!--上传文件的最大大小,单位为字节 -->
<property name="maxUploadSize" value="17367648787"></property>

<!-- 上传文件的编码 -->
<property name="defaultEncoding" value="UTF-8"></property>
</bean>

结束