Java调用LDAP认证的例子

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import java.util.Hashtable;    import javax.naming.AuthenticationException;  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.Control;  import javax.naming.ldap.InitialLdapContext;  import javax.naming.ldap.LdapContext;    public class UserAuthenticate {      private String URL = "ldap://localhost:389/";      private String BASEDN = "c=china,dc=jayway,dc=se";//root      private String FACTORY = "com.sun.jndi.ldap.LdapCtxFactory";      private LdapContext ctx = null;      private Hashtable env = null;      private Control[] connCtls = null;     //连接ldap服务器      private void LDAP_connect(){          env = new Hashtable();          env.put(Context.INITIAL_CONTEXT_FACTORY,FACTORY);          env.put(Context.PROVIDER_URL, URL+BASEDN);//LDAP server          env.put(Context.SECURITY_AUTHENTICATION, "simple");          env.put(Context.SECURITY_PRINCIPAL, "cn=Manager,c=china,dc=jayway,dc=se");             env.put(Context.SECURITY_CREDENTIALS, "mysecret");       //此处若不指定用户名和密码,则自动转换为匿名登录                   try{              ctx = new InitialLdapContext(env,connCtls);          }catch(javax.naming.AuthenticationException e){              System.out.println("Authentication faild: "+e.toString());          }catch(Exception e){              System.out.println("Something wrong while authenticating: "+e.toString());          }      }          //找到到entry的 DN      String getUserDN(String email){          String userDN = "";                   LDAP_connect();                   try{                 SearchControls constraints = new SearchControls();                 constraints.setSearchScope(SearchControls.SUBTREE_SCOPE);                 NamingEnumeration en = ctx.search("","mail="+email, constraints); //The UID you are going to query,* means all nodes                 if(en == null){                  System.out.println("Have no NamingEnumeration.");                 }                 if(!en.hasMoreElements()){                  System.out.println("Have no element.");                 }                 while (en != null && en.hasMoreElements()){//maybe more than one element                     Object obj = en.nextElement();                     if(obj instanceof SearchResult){                         SearchResult si = (SearchResult) obj;                         userDN += si.getName();                         userDN += "," + BASEDN;                     }                     else{                         System.out.println(obj);                     }                     System.out.println();                 }                }catch(Exception e){                 System.out.println("Exception in search():"+e);                }                   return userDN;      }          //验证      public boolean authenricate(String ID,String password){          boolean valide = false;          String userDN = getUserDN(ID);          try {              ctx.addToEnvironment(Context.SECURITY_PRINCIPAL,userDN);              ctx.addToEnvironment(Context.SECURITY_CREDENTIALS,password);              ctx.reconnect(connCtls);              System.out.println(userDN + " is authenticated(验证成功！)");              valide = true;          }catch (AuthenticationException e) {              System.out.println(userDN + " is not authenticated");              System.out.println(e.toString());              valide = false;          }catch (NamingException e) {              System.out.println(userDN + " is not authenticated");              valide = false;          }                   return valide;      }  }