C#如何覆盖LDAP服务器限制，而不是Java [英] How can C# override LDAP server limit, but not Java

问题描述

我正在将我的C#程序重写为Java，并对有关C#应用程序可以使用此技巧提取成千上万用户的事实感到非常好奇:

I'm rewriting my C# program to Java and became very curios about the fact that C# application can extract tens of thousands of users with this trick:

DirectorySearcher search = new DirectorySearcher(entry);
search.SizeLimit = 99000;
search.PageSize = 98000;

但是我的Java程序坚定地说

but my Java programs firmly say

LDAPSearchException(resultCode = 4(超出大小限制)，numEntries = 1000，numReferences = 0，errorMessage =超出大小限制")

我尝试了unboundid和标准库.已找到有关该问题的数百万次讨论，到处都有报道-限制在服务器上，您无能为力.

I tried both unboundid and standard libraries. Found million discussions about this problem and everywhere is said - the limitation is on server, you can do nothing.

但是我的C#应用​​程序确实可以工作！怎么会这样微软的秘密技术，其他供应商无法重复?

But my C# application does work! How can this happen? Secret techniques from Microsoft, that cannot be repeated by other vendors?

以防万一，我的代码是:

Just in case, my code is:

SearchRequest searchRequest = new SearchRequest(path, SearchScope.SUB, filter, "SamAccountName");
searchRequest.setSizeLimit(99000);
searchRequest.setTimeLimitSeconds(999);

SearchResult result = connection.search(searchRequest);

for (SearchResultEntry sre : result.getSearchEntries()) {
System.out.println(count++ + ": " + sre.toString());
}

对于无限制

p.s.我不想在搜索a *，b *，c *时使用变通办法 等等.特别是考虑到用户名可能不仅是英文的.

p.s. I do not want to use workaround with searching for a*, b*, c* et c. Especially, considering that usernames might be not only in English.

推荐答案

进一步的阅读显示，unboundid确实支持分页模式，因此问题得以解决.

Further reading showed, that unboundid does support paged mode, so problem is solved.

 public static void main(String[] args) {

    try {
        int count = 0;
        LDAPConnection connection = new LDAPConnection("hostname", 389, "user@domain", "password");

        final String path = "OU=Users,DC=org,DC=com";
        String[] attributes = {"SamAccountName","name"};

        SearchRequest searchRequest = new SearchRequest(path, SearchScope.SUB, Filter.createEqualityFilter("objectClass", "person"), attributes);

        ASN1OctetString resumeCookie = null;
        while (true)
        {
            searchRequest.setControls(
                    new SimplePagedResultsControl(100, resumeCookie));
            SearchResult searchResult = connection.search(searchRequest);
            for (SearchResultEntry e : searchResult.getSearchEntries())
            {
                if (e.hasAttribute("SamAccountName"))
                    System.out.print(count++ + ": " + e.getAttributeValue("SamAccountName"));

                if (e.hasAttribute("name"))
                    System.out.println("->" + e.getAttributeValue("name"));
            }

            LDAPTestUtils.assertHasControl(searchResult,
                    SimplePagedResultsControl.PAGED_RESULTS_OID);
            SimplePagedResultsControl responseControl =
                    SimplePagedResultsControl.get(searchResult);
            if (responseControl.moreResultsToReturn())
            {
                resumeCookie = responseControl.getCookie();
            }
            else
            {
                break;
            }
        }


    }
    catch (Exception e)
    {
        System.out.println(e.toString());
    }
}

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