通过java语言去LDAP检索信息

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1.初始化上下文

 public InitialDirContext createLDAPContext(String ldapHost, String ldapPort, String bindDN, String bindPwd)     throws NamingException   {     Hashtable env = new Hashtable();     env.put("java.naming.factory.initial", "com.sun.jndi.ldap.LdapCtxFactory");     env.put("java.naming.factory.url.pkgs", "com.ibm.jndi");     env.put("java.naming.provider.url", "ldap://" + ldapHost + ":" + ldapPort);     env.put("java.naming.security.principal", bindDN);     env.put("java.naming.security.credentials", bindPwd);     InitialDirContext dirCtx = new InitialDirContext(env);     return dirCtx;   }

2.获取uid为20170808用户的姓名
姓名属性为displayName，参数：
dn=”uid=20170808,dc=test,dc=com”,attrName=”displayName”

public synchronized String getLDAPAttribute(String dn, String attrName, DirContext dirCtx) {     String result = null;     boolean rebuilt = false;     try { Attributes attrs;       Attribute attr;       do { attrs = dirCtx.getAttributes(dn);         attr = attrs.get(attrName); }       while (attrs == null);       result = (String)attr.get();     } catch (CommunicationException ce)     {       while (true) {         if (!rebuilt) {           try           {             createLDAPContext(SystemProperties.getLDAP_HOST(), SystemProperties.getLDAP_PORT(), SystemProperties.getLDAP_BINDDN(), SystemProperties.getLDAP_BINDPASSWORD());             rebuilt = true;           }           catch (NamingException ne) {             log.error(ne.toString());           }         }       }     }     catch (Exception ex)     {       log.error("*********LDAP attribute not found: " + ex.toString() + "**********");     }       log.info("********getLDAPAttribute(): exit (" + result + ").*********");     return result;}

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