Spring MVC 拦截器实现

自定义拦截器类 public class SessionInterceptor extends HandlerInterceptorAdapter {

public SessionInterceptor() {
	// TODO Auto-generated constructor stub
}

private List<String> excludedUrls;

//通过属性注册不需要过滤的url list
public void setExcludedUrls(List<String> excludedUrls) {
	this.excludedUrls = excludedUrls;
}


@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
	throws Exception {
	
	String requestUrl = request.getRequestURI();
	//排除不需要过滤的URL
	for(String url:excludedUrls) {
		if(requestUrl.endsWith(url)) {
			return true;
		}
	}
	//获取当前的会话session
	HttpSession session = request.getSession();
	if(session.getAttribute("userid") == null) {
		//若登录session过期或不存在就跳转到login页面
		request.getRequestDispatcher("/login.jsp").forward(request, response);
		return false;
	}
	return true;
}

} springmvc-servlet.xml 拦截器注册

mvc:interceptors mvc:interceptor <!--
/的意思是所有文件夹及里面的子文件夹 /*是所有文件夹，不含子文件夹 /是web项目的根目录 --> <mvc:mapping path="/" /> <!-- 需排除拦截的地址 -->
<!-- <mvc:exclude-mapping path="/login"/> --> <bean id="commonInterceptor" class="com.skcc.chart.interceptor.SessionInterceptor"> <property name="excludedUrls"> <list> <value>/login</value> </list> </property>

               </bean> <!--这个类就是我们自定义的Interceptor -->
      </mvc:interceptor> 
      <!-- 当设置多个拦截器时，先按顺序调用preHandle方法，然后逆序调用每个拦截器的postHandle和afterCompletion方法  -->
</mvc:interceptors>
	<!-- Handles HTTP GET requests for /resources/** by efficiently serving up static resources in the ${webappRoot}/resources directory  -->
<mvc:resources mapping="/resources/**" location="/resources/" order="0" />
<mvc:resources mapping="/js/**" location="/js/" order="0" />
<mvc:resources mapping="/css/**" location="/css/" order="0" />
	  <!-- Spring MVC不处理静态资源 -->
<mvc:default-servlet-handler />
 <!-- 配置注解的处理器映射器和处理器适配器 -->
<mvc:annotation-driven ></mvc:annotation-driven>
	
	HandlerInterceptorAdapter不能拦截WEB-INF目录以外的jsp文件；若需拦截默认index.jsp；可以将index.jsp移动目录到WEB-INF下即可；