Spring MVC 攔截器實現

自定義攔截器類
public class SessionInterceptor extends HandlerInterceptorAdapter {

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

private List<String> excludedUrls;

//通過屬性注冊不需要過濾的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();
    //排除不需要過濾的URL
    for(String url:excludedUrls) {
        if(requestUrl.endsWith(url)) {
            return true;
        }
    }
    //獲取當前的會話session
    HttpSession session = request.getSession();
    if(session.getAttribute("userid") == null) {
        //若登錄session過期或不存在就跳轉到login頁面
        request.getRequestDispatcher("/login.jsp").forward(request, response);
        return false;
    }
    return true;
}

}
springmvc-servlet.xml 攔截器注冊

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

               </bean> <!--這個類就是我們自定義的Interceptor -->
      </mvc:interceptor> 
      <!-- 當設置多個攔截器時，先按順序調用preHandle方法，然后逆序調用每個攔截器的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不處理靜態資源 -->
<mvc:default-servlet-handler />
 <!-- 配置注解的處理器映射器和處理器適配器 -->
<mvc:annotation-driven ></mvc:annotation-driven>

    HandlerInterceptorAdapter不能攔截WEB-INF目錄以外的jsp文件；若需攔截默認index.jsp；可以將index.jsp移動目錄到WEB-INF下即可；