1.ssm框架的攔截器是在springmvc-servlet.xml配置文件中進行配置

<!-- 攔截器 -->
    <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/**" />
            <bean class="cn.com.***.controller.common.SecurityInterceptor">
                <!-- 不需要session驗證的地址 -->
                <property name="excludeUrls">
                    <list>
                        <value>/web/index</value>
                        <value>/web/aboutsPage</value>                                              
                    </list>
                </property>
            </bean>
        </mvc:interceptor>
    </mvc:interceptors>

2.創建一個攔截器實體類，繼承HandlerInterceptor，重寫它的方法，preHandle是調用Controller具體方法之前攔截，postHandle是調用Controller具體方法之後攔截，afterCompletion是完成頁面後調用，所以在preHandle裏面寫邏輯代碼，如登入之後怎麽做，沒登錄這麽做，或者根據不同的登錄平臺進行跳轉之類的邏輯

package cn.com.***.controller.common;

import java.util.List;
import javax.servlet.http.HttpServletRequest;
import
 
 javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import cn.com.***.common.pojo.WSessionInfo;
import cn.com.***.common.result.Constant;


/**
 * 權限攔截器
 */
public class SecurityInterceptor implements HandlerInterceptor {

    
 
private List<String> excludeUrls;// 不需要攔截的資源
    private List<String> wapUrls;//wapurl
    
    public List<String> getWapUrls() {
        return wapUrls;
    }

    public void setWapUrls(List<String> wapUrls) {
        this.wapUrls = wapUrls;
    }

    public List<String> getExcludeUrls() {
        return excludeUrls;
    }

    public void setExcludeUrls(List<String> excludeUrls) {
        this.excludeUrls = excludeUrls;
    }

    /**
     * 完成頁面的render後調用
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object object,
            Exception exception) throws Exception {
    }

    /**
     * 在調用controller具體方法後攔截
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object object,
            ModelAndView modelAndView) throws Exception {
    }

    /**
     * 在調用controller具體方法前攔截
     */
    @SuppressWarnings("unchecked")
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object object) throws Exception {
         //請求的路徑
        String contextPath=request.getContextPath();
        String  url=request.getServletPath().toString();
        StringBuffer realUrl = request.getRequestURL();
        WSessionInfo sessionInfo = (WSessionInfo) request.getSession().getAttribute(Constant.SESSION_INFO);
              

          if (sessionInfo == null) {
            String isqian = url.substring(0, 4);
            if (isqian.equals("/wap")) {
              response.sendRedirect(contextPath + "/wap/adminLogin");
              return true;
            }if (isqian.equals("/web")) {
              response.sendRedirect(contextPath + "/web/index");
            } else if (realUrl.toString().equals(contextPath +"/web/index")) {
              response.sendRedirect(contextPath + "/wap/adminLogin");
              return true;
            }
          }
        return true ;
        
    }
}

ssm框架攔截器