spring Ldap 分页操作实现

//curPage:要查询的页数,pageSize：每页数据量
    @Override
    public  List getUserInfo( int  curPage,  int  pageSize)  throws  Exception
    {
        // 用于存储条目列表
        List list =  new  ArrayList();
        AttributesMapper attributesMapper =  new  AttributesMapper() {
            @Override
            public  Object mapFromAttributes(Attributes attributes)
                    throws  NamingException {
                return  attributes;
            }
        };
        // 设置filter
        String filter =  "objectclass=person" ;
        // 声明搜索控件
        SearchControls searchControls =  new  SearchControls();
        // 指定检索范围
        searchControls.setSearchScope(SearchControls.ONELEVEL_SCOPE);
        /*
         * 0:OBJECT_SCOPE,搜索指定的命名对象。
         * 1:ONELEVEL_SCOPE,只搜索指定命名对象的一个级别，这是缺省值。
         * 2:SUBTREE_SCOPE,搜索以指定命名对象为根结点的整棵树  **/
        // 声明属性名集合，并由Map类型转换为String类型数组
        // 设置要返回的属性，即所有
        String[] s = { "uid" , "initials" , "userPassword" , "employeeNumber" , "displayName" , "businessCategory" , "departmentNumber" , "homePhone" , " homePostalAddress" , "mail" , "telexNumber" , "telephoneNumber" , "postalCode" , "title" , "givenName" , "destinationIndicator" , "roomNumber" , "description" , "sn" , "cn" };
        searchControls.setReturningAttributes(s);
        // 设置handler，handler里存储了条目的list
        CollectingNameClassPairCallbackHandler handler  = (CollectingNameClassPairCallbackHandler)  new  AttributesMapperCallbackHandler( attributesMapper);
        // 设置页面大小
        //PagedResultsControl pagedResultsControl = new PagedResultsControl(1, true);
        PagedResultsResponseControl p =  new  PagedResultsResponseControl(PagedResultsResponseControl.OID, true , null );
        PagedResultsCookie pagedResultsCookie =  new  PagedResultsCookie(p.getCookie());
        PagedResultsRequestControl requestControl= new  PagedResultsRequestControl(pageSize,pagedResultsCookie);
        //PagedResultsRequestControl requestControl  = new PagedResultsRequestControl(pageSize);
        // 分为两种情况，第一种只取第一页，第二种取其他页数
        if  (curPage ==  1 ) {
            try    {
                // 只获取第一页
                this .getLdapTemplate().search( "" , filter, searchControls, handler,requestControl);
                list = handler.getList();
            }  catch  (Exception e){
                System.out.println( "分页查询异常1"  + e);
            }
        } else {
            try
            {
                // 按分页搜索，并将结果存进handler，这里获取第一页
                this .getLdapTemplate().search( "" , filter, searchControls, handler,requestControl);
                // 循环获取其余的页数，直至目标页
                for  ( int  i =  0 , cur_1 = curPage -  1 , cur_2 = curPage -  2 ; i < cur_1; i++)
                {
                    // 声明临时变量handlerTemp。用于每次存储该次搜索的页面信息
                    CollectingNameClassPairCallbackHandler handlerTemp =  new  AttributesMapperCallbackHandler(attributesMapper);
                    // 设置页面大小
//                    PagedResultsCookie pagedResultsCookie1 = new PagedResultsCookie(p.getCookie());
                    requestControl =  new  PagedResultsRequestControl(pageSize,requestControl.getCookie());
                    // 在上次查询的基础上继续往后查询
                    this .getLdapTemplate().search( "" , filter, searchControls,handlerTemp, requestControl);
                    // 检测为当前页，获取当前页的条目列表
                    if  (i == cur_2){
                        list = handlerTemp.getList();
                    }
                }
            } catch  (Exception e){
                System.out.println( "分页查询异常2"  + e);
            }
        }
        return  list;
    }