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Код

public String authenticateUser(String username, String password) {
        Hashtable environment = new Hashtable();
        environment.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
        environment.put(Context.PROVIDER_URL, "ldap://" + HOST + ":" + PORT); //Using standard port
        environment.put(Context.SECURITY_AUTHENTICATION, "simple");
        environment.put(Context.SECURITY_PRINCIPAL, username + "@" + DOMAIN);
        environment.put(Context.SECURITY_CREDENTIALS, password);
        LdapContext ctxGC = null;
        try {
            ctxGC = new InitialLdapContext(environment, null);
            System.out.println("Success!");
            return "success";
        } catch (AuthenticationException e) {
            System.out.println("Fail! Wrong credentials!");
            e.printStackTrace();
        }catch (NamingException ne){
            System.out.println("Fail! Wrong credentials!");
            ne.printStackTrace();
        }
        System.out.println("Fail!!");
        return "fail";
    }