我设法让分页像描述的那样工作here http://docs.oracle.com/javase/tutorial/jndi/newstuff/paged-results.html。问题是我需要公开一个如下所示的 API：getUsers(pageSize, pageNumber)，这与 JNDI/LDAP 进行分页的方式并不太相配（每次都将 cookie 传递给搜索方法）。代码如下所示：

private NamingEnumeration ldapPagedSearch(String filter, int pageSize, int pageNumber){
    InitialLdapContext ctx = getInitialContext();

    //TODO: get the id also, need to spec it in UI
    // Create the search controls
    SearchControls searchCtls = new SearchControls();
    searchCtls.setSearchScope(SearchControls.SUBTREE_SCOPE);

    //keep a session
    byte[] cookie = null;

    //Request the paged results control
    Control[] ctls = new Control[]{new PagedResultsControl(pageSize, true)};
    ctx.setRequestControls(ctls);

    //Specify the search scope
    NamingEnumeration results = null;
    int currentPage = 1;
    do {
        results = ctx.search(getConfiguration().get(BASEDN_KEY), filter, searchCtls);

        //we got to the right page, return this page
        if(currentPage == pageNumber) {
            return results;
        }

        // loop through this page, because we cannot get a proper cookie otherwise
        // WARN: this could be a problem of performance
        while (results.hasMore()) results.next();

        // examine the paged results control response
        Control[] controls = ctx.getResponseControls();
        if (controls != null) {
            for (Control control : controls) {
                if (control instanceof PagedResultsResponseControl) {
                    cookie = ((PagedResultsResponseControl) control).getCookie();
                } 
            }
        }

        // pass the cookie back to the server for the next page
        ctx.setRequestControls(new Control[]{new PagedResultsControl(pageSize, cookie, Control.CRITICAL) });

        //increment page
        currentPage++;
    } while (cookie != null);


    ctx.close();

    //if we get here, means it is an empty set(consumed by the inner loop)
    return results;
}

看来我需要遍历所有页面才能获得所需的页面。此外，我需要遍历页面上的所有条目，以便能够获取下一页。

有没有更好的办法？我担心性能问题。

有一种叫做“虚拟列表视图”的控件。它由几个 LDAP 服务器支持。不确定该实现是否仍在 JNDI 中。如果没有，您可以考虑自己实现。您必须将它与服务器端排序一起使用。

也可以看看https://datatracker.ietf.org/doc/html/draft-ietf-ldapext-ldapv3-vlv-04 https://datatracker.ietf.org/doc/html/draft-ietf-ldapext-ldapv3-vlv-04 and http://www.cs.rit.edu/usr/local/pub/jeh/rit/java/lib/doc/ldapcontrols/com/sun/jndi/ldap/ctl/VirtualListViewControl.html http://www.cs.rit.edu/usr/local/pub/jeh/rit/java/lib/doc/ldapcontrols/com/sun/jndi/ldap/ctl/VirtualListViewControl.html