我的代码有问题：
import java.util.Hashtable;
import javax.naming.Context;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.DirContext;
import javax.naming.directory.SearchControls;
import javax.naming.directory.SearchResult;
import javax.naming.ldap.InitialLdapContext;
import javax.naming.ldap.LdapContext;
/**
* Example code for retrieving a Users Primary Group
* from Microsoft Active Directory via. its LDAP API
*
public class LDAPTest {
/**
* @param args the command line arguments
*/
public static void main(String[] args) throws NamingException {
final String ldapAdServer = "/*Server*/";
final String ldapSearchBase = "ou=users,ou=,dc=,dc=";
final String ldapUsername = "/*Username*/";
final String ldapPassword = "/*Passwort*/";
final String ldapAccountToLookup = "/*lookupaccount*/";
Hashtable<String, Object> env = new Hashtable<String, Object>();
env.put(Context.SECURITY_AUTHENTICATION, "simple");
if(ldapUsername != null) {
env.put(Context.SECURITY_PRINCIPAL, ldapUsername);
}
if(ldapPassword != null) {
env.put(Context.SECURITY_CREDENTIALS, ldapPassword);
}
env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
env.put(Context.PROVIDER_URL, ldapAdServer);
//ensures that objectSID attribute values
//will be returned as a byte[] instead of a String
env.put("java.naming.ldap.attributes.binary", "objectSID");
//the following is helpful in debugging errors
env.put("com.sun.jndi.ldap.trace.ber", System.err);
LdapContext ctx = new InitialLdapContext(env,null);
LDAPTest ldap = new LDAPTest();
//1) lookup the ldap account
SearchResult srLdapUser = ldap.findAccountByAccountName(ctx, ldapSearchBase, ldapAccountToLookup);
//2) get the SID of the users primary group
String primaryGroupSID = ldap.getPrimaryGroupSID(srLdapUser);
//3) get the users Primary Group
String primaryGroupName = ldap.findGroupBySID(ctx, ldapSearchBase,primaryGroupSID);
}
public SearchResult findAccountByAccountName(DirContext ctx, String ldapSearchBase, String accountName) throws NamingException {
String searchFilter = "(&(objectClass=user)(sAMAccountName=" + accountName + "))";
SearchControls searchControls = new SearchControls();
searchControls.setSearchScope(SearchControls.SUBTREE_SCOPE);
NamingEnumeration<SearchResult> results = ctx.search(ldapSearchBase, searchFilter, searchControls);
SearchResult searchResult = null ;
if(results.hasMoreElements()) {
searchResult = (SearchResult) results.nextElement();
//make sure there is not another item available, there should be only 1 match
if(results.hasMoreElements()) {
System.err.println("Matched multiple users for the accountName: " + accountName);
return null;
}
}
return searchResult;
}
public String findGroupBySID(DirContext ctx, String ldapSearchBase, String sid) throws NamingException {
String searchFilter = "(&(objectClass=group)(objectSid=" + sid + "))";
SearchControls searchControls = new SearchControls();
searchControls.setSearchScope(SearchControls.SUBTREE_SCOPE);
NamingEnumeration<SearchResult> results = ctx.search(ldapSearchBase, searchFilter, searchControls);
if(results.hasMoreElements()) {
SearchResult searchResult = (SearchResult) results.nextElement();
//make sure there is not another item available, there should be only 1 match
if(results.hasMoreElements()) {
System.err.println("Matched multiple groups for the group with SID: " + sid);
return null;
} else {
return (String)searchResult.getAttributes().get("sAMAccountName").get();
}
}
return null;
}
public String getPrimaryGroupSID(SearchResult srLdapUser) throws NamingException {
byte[] objectSID = (byte[])srLdapUser.getAttributes().get("objectSid").get();
String strPrimaryGroupID = (String)srLdapUser.getAttributes().get("primaryGroupID").get();
String strObjectSid = decodeSID(objectSID);
return strObjectSid.substring(0, strObjectSid.lastIndexOf('-') + 1) + strPrimaryGroupID;
}
/**
* The binary data is in the form:
* byte[0] - revision level
* byte[1] - count of sub-authorities
* byte[2-7] - 48 bit authority (big-endian)
* and then count x 32 bit sub authorities (little-endian)
*
* The String value is: S-Revision-Authority-SubAuthority[n]...
*
* Based on code from here - http://forums.oracle.com/forums/thread.jspa?threadID=1155740&tstart=0
*/
public static String decodeSID(byte[] sid) {
final StringBuilder strSid = new StringBuilder("S-");
// get version
final int revision = sid[0];
strSid.append(Integer.toString(revision));
//next byte is the count of sub-authorities
final int countSubAuths = sid[1] & 0xFF;
//get the authority
long authority = 0;
//String rid = "";
for(int i = 2; i <= 7; i++) {
authority |= ((long)sid[i]) << (8 * (5 - (i - 2)));
}
strSid.append("-");
strSid.append(Long.toHexString(authority));
//iterate all the sub-auths
int offset = 8;
int size = 4; //4 bytes for each sub auth
for(int j = 0; j < countSubAuths; j++) {
long subAuthority = 0;
for(int k = 0; k < size; k++) {
subAuthority |= (long)(sid[offset + k] & 0xFF) << (8 * k);
}
strSid.append("-");
strSid.append(subAuthority);
offset += size;
}
return strSid.toString();
}
}
首先，如果我运行此代码，我将变成错误消息：
Exception in thread "main" javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial
at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)
at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)
at javax.naming.InitialContext.getURLOrDefaultInitCtx(Unknown Source)
at javax.naming.directory.InitialDirContext.getURLOrDefaultInitDirCtx(Unknown Source)
at javax.naming.directory.InitialDirContext.search(Unknown Source)
at LDAPTest.findAccountByAccountName(LDAPTest.java:74)
at LDAPTest.main(LDAPTest.java:58)
作为一种措施，我将LdapContext ctx = new InitialLdapContext（env，null）;
现在我收到错误消息
Exception in thread "main" java.lang.NullPointerException
at LDAPTest.getPrimaryGroupSID(LDAPTest.java:114)
at LDAPTest.main(LDAPTest.java:61)
我不知道如何继续。有谁能够帮助我？有人熟悉吗？ -------------------------------------------------- --------------
答案 0 :(得分：-1)
您可以尝试执行此操作，如果您的ldap身份验证可能未正确完成，则会发生命名异常。
private boolean isLdapServerOnline() {
try {
Hashtable authEnv = new Hashtable();
authEnv.put(Context.INITIAL_CONTEXT_FACTORY, LDAP_JNDI_FACTORY);
authEnv.put(Context.PROVIDER_URL, ldapUrl);
authEnv.put(Context.SECURITY_AUTHENTICATION, ldapSecurityAuthentication);
authEnv.put(Context.SECURITY_PRINCIPAL, ldapDistinguishedName);
authEnv.put(Context.SECURITY_CREDENTIALS, ldapPassword);
DirContext authContext = new InitialDirContext(authEnv);
return true;
} catch (AuthenticationException authEx) {
LOGGER.error("Active Directory Authentication failed", authEx);
return false;
} catch (NamingException namEx) {
LOGGER.error("Unable to connect to Active Directory", namEx);
return false;
}
}