想要查询所有objectClass SearchControls参数应该怎么设置

可以设置SearchControls的searchScope为SUBTREE_SCOPE，filter为"(objectClass=*)"，这样就可以查询所有objectClass了。具体代码示例如下：

SearchControls controls = new SearchControls();
controls.setSearchScope(SearchControls.SUBTREE_SCOPE);
controls.setReturningAttributes(new String[]{"objectClass"});
controls.setReturningObjFlag(true);

NamingEnumeration<SearchResult> results = context.search(baseDN, "(objectClass=*)", controls);
while (results.hasMoreElements()) {
    SearchResult result = results.nextElement();
    Attributes attrs = result.getAttributes();
    Attribute objectClass = attrs.get("objectClass");
    System.out.println(objectClass);
}