如何在JSP中查找LDAP用户的DN？

Question

我想在JSP中的LDAP树中查找用户的OU。我可以检索许多用户的LDAP与下面的代码属性：

Hashtable<String, String> tenv = new Hashtable<String, String>(); 

tenv.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory"); 
tenv.put(Context.PROVIDER_URL, "ldap://xx.xx.xx.xx:389/"); 

SearchControls sc = new SearchControls(); 
sc.setSearchScope(SearchControls.SUBTREE_SCOPE); 

LdapContext lctx = new InitialLdapContext(tenv, null); 
String filter = "cn=" + userid; 
NamingEnumeration res = lctx.search ("dc=my,dc=dom,dc=org", filter, sc); 

while (res.hasMore()) 
{ 
    SearchResult s = (SearchResult) res.next(); 
    Attributes attrs = s.getAttributes(); 
    Attribute attr = attrs.get("SN"); 
    out.println ("<font color=red>" + attr + "</font>"); 
} 

当我运行在Linux命令行ldapsearch的，具有类似的搜索参数，我可以看到一个DN：这说明OU用户在（dn：uid = username，ou = users，dc = my，dc = dom，dc = org）。 我试过attrs.get（“DN”）并返回null。我如何检索这个DN：在JSP中？

Answer 1

显然有 “there is no direct way of obtaining the Distinguished Name (DN) from the search results.”

此代码将做到这一点：

import java.util.Hashtable; 

import javax.naming.Context; 
import javax.naming.NamingEnumeration; 
import javax.naming.NamingException; 
import javax.naming.directory.Attribute; 
import javax.naming.directory.Attributes; 
import javax.naming.directory.DirContext; 
import javax.naming.directory.InitialDirContext; 
import javax.naming.ldap.*; 
import javax.naming.directory.SearchControls; 
import javax.naming.directory.SearchResult; 
class GetAllAttrs 
{ 

    public static void main(String[] args) 
    { 
    String filter = "cn=myuser"; // this is the user to look for 
    String baseDN = "dc=my,dc=dom,dc=org"; 
    String ldapURL = "ldap://192.168.101.1:389"; 

    // Set up the environment for creating the initial context 
    Hashtable<String, Object> env = new Hashtable<String, Object>(11); 
    env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory"); 
    env.put(Context.PROVIDER_URL, ldapURL); 

    try 
    { 
     // Create the initial context 
     LdapContext ctx = new InitialLdapContext(env, null); 

     SearchControls sc = new SearchControls(); 
     sc.setSearchScope(SearchControls.SUBTREE_SCOPE); 
     NamingEnumeration res = ctx.search (baseDN, filter, sc); 

     while (res.hasMore()) 
     { 
     SearchResult s = (SearchResult) res.next(); 

     // print user's DN 
     System.out.println(">>" + s.getNameInNamespace()); 
     } 

     // Close the context when we're done 
     ctx.close(); 

    } 
    catch (Exception e) 
    { 
     e.printStackTrace(); 
    } 
    } 
}