1.spring攔截器配置

<mvc:interceptors>
   <mvc:interceptor>
      <mvc:mapping path="/privileges/*"/>
      <mvc:mapping path="/system/*"/>
      <mvc:mapping path="/business/*"/>
      <!--<mvc:exclude-mapping path="/checkCAticket/**"/>-->
      <!--<mvc:exclude-mapping path="/bcookie/**"/>-->
      <!--<mvc:exclude-mapping path="/quickLg/quickLogin.action"/>-->
      <bean class="com.zm.mall.web.interceptor.CacheInterceptor"></bean>
   </mvc:interceptor>
</mvc:interceptors>
 

2.攔截器攔截

public class CacheInterceptor implements HandlerInterceptor {
   @Override
   public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
       response.setContentType("text/html;charset=UTF-8");
       request.setCharacterEncoding("UTF-8");
       String uri = request.getRequestURI();
//       String url = request.getRequestURL().toString();
       UserResult user=(UserResult)request.getSession().getAttribute("userResult");
	//登入方法 不攔截
       if (uri.endsWith("/toLogin.action")||uri.endsWith("/login.action")||uri.endsWith("/MenuList.action")) { // "/user_loginUI", "/user_login"
           // 如果是去登入，就放行
           return true;
       }else{
           if (user != null) {
		//有許可權 放行
               if(user.hasPrivilegeByUri(uri,request)){

                   return true;
               }else {
                   request.getRequestDispatcher("/WEB-INF/vm/system/noPrivilege.vm").forward(request, response);
                   return false;
               }
           }else{
               request.getRequestDispatcher("/WEB-INF/vm/system/login.vm").forward(request, response);
               return false;
           }
       }
   }
 

3.判斷有沒有許可權的方法

public boolean hasPrivilegeByUri(String url,HttpServletRequest request){
      //管理員放行
	if(isAdmin()){
         return true;
      } 
//迴圈許可權的list 遍歷匹配
   for(Role role :roles){
         for(Privileges privileges :role.getPrivileges()){
            if(privileges.getUrl()!=null){//防空指標
               if(privileges.getUrl().equals(url)) {
                  return true;
               }
            }
         }
      }
      return false;

   }
 

4.1 velocity.properties配置檔案加入自定義標籤的路徑

userdirective=com.zm.mall.taglib.VelocityTaglib

4.2 自定義標籤，通過頁面載入之前觸發，將頁面中的自定義標籤的屬性 寫入到a標籤中

package com.zm.mall.taglib;
/**
 * Created by Administrator on 2016/12/21.
 */

import com.zm.mall.client.result.system.UserResult;
import org.apache.velocity.context.InternalContextAdapter;
import org.apache.velocity.exception.MethodInvocationException;
import org.apache.velocity.exception.ParseErrorException;
import org.apache.velocity.exception.ResourceNotFoundException;
import org.apache.velocity.runtime.directive.Directive;
import org.apache.velocity.runtime.parser.node.Node;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.io.Writer;

/**
 * @author
 * @create 2016-12-21 14:13
 */
public class VelocityTaglib extends Directive{
    public String getName() {
            return "vela";
    }
    public int getType() {
        return LINE;
    }
    public boolean render(InternalContextAdapter context, Writer writer,Node node) throws IOException, ResourceNotFoundException, ParseErrorException, MethodInvocationException {
        String href = null;
        String name = null;
        String id = null;
        String clazz = null;
        if(node.jjtGetChild(0) != null){
            href = String.valueOf(node.jjtGetChild(0).value(context));
        }
        if(node.jjtGetChild(1) != null){
            name = String.valueOf(node.jjtGetChild(1).value(context));
        }
        if(node.jjtGetChild(2) != null){
            id = String.valueOf(node.jjtGetChild(2).value(context));
        }
        if(node.jjtGetChild(3) != null){
            clazz = String.valueOf(node.jjtGetChild(3).value(context));
        }
        HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
        UserResult user=(UserResult)request.getSession().getAttribute("userResult");
        int pos = href.indexOf("?");
        String subhref="";
        if (pos > -1) {
            subhref = href.substring(0, pos);
        }else{
            subhref =href;
        }
        if (user.hasPrivilegeByUri(subhref,request)) {
            writer.write("<a   href='"+href+"' id='"+id+"' class='"+clazz+"'  >"+name+"</a>");
            return true;
        } else {
            return false;
        }

    }
}