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ATTRS, false ); // Loop on results until complete while ( reshasMoreElements() ) { try { // Next directory entry LDAPEntry entry = resnext();
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Once the search request is issued, we retrieve each eligible record and send it to
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prettyPrint for display on the console, as the following code shows For now, we will
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ignore any referrals returned by the server Referrals are discussed in detail in 16 If any errors result in an exception (netscapeldapLDAPException), we just print the error and continue to process any remaining results All classes in the SDK have a toString method, which provides useful information about the state of each object
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prettyPrint( entry, ATTRS ); status = 0; } catch ( LDAPReferralException e ) { // Ignore referrals continue; } catch ( LDAPException e ) { Systemoutprintln( etoString() ); continue; } } } catch( LDAPException e ) { Systemoutprintln( etoString() ); }
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The following block disconnects us from the LDAP server
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// Done, so disconnect if ( (ld != null) && ldisConnected() ) { try { lddisconnect(); } catch ( LDAPException e ) { Systemoutprintln( etoString() ); } } Systemexit( status ); }
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Our First Search
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The method prettyPrint takes a returned entry and the array of the attributes we requested and pulls the values from the search result:
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/** * Print names and values of attributes in an entry * * @param entry entry containing attributes * @param attrs array of attribute names to display */ public static void prettyPrint( LDAPEntry entry, String[] attrs ) { Systemoutprintln( "DN: " + entrygetDN() ); // Use array to pick attributes We could have // enumerated them all using LDAPEntrygetAttributes // but this gives us control of the display order for ( int i = 0; i < attrslength; i++ ) { LDAPAttribute attr = entrygetAttribute( attrs[i] ); if ( attr == null ) { Systemoutprintln( attrs[i] + " not present" ); continue; } Enumeration enumVals = attrgetStringValues(); // Enumerate on values for this attribute boolean hasVals = false; while ( (enumVals != null) && enumValshasMoreElements() ) { String val = (String)enumValsnextElement(); Systemoutprintln( attrs[i] + ": " + val ); hasVals = true; } if ( !hasVals ) { Systemoutprintln( attrs[i] + " has no values" ); } } Systemoutprintln(" "); } }
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The value or values for each attribute are obtained with getStringValues, which returns an Enumeration Most LDAP attributes are strings, but some are binary Examples of binary attributes are userCertificate;binary and jpegPhoto
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It is up to you, the programmer, to specify if you want the values delivered to you as strings or as binaries The alternative interface is getBinaryValues There is no way to query the directory to determine whether it is appropriate to call getString Values or getBinaryValues on an attribute As a programmer you must have some understanding of the data type represented in a particular attribute For standard LDAP attributes the data type is typically a known format that is the same in all applications Data from the directory is always returned in binary or UTF8 format, not in any other character set (such as latin-1 or shift-jis) Strings are represented internally in UTF8 format, a form of Unicode, which allows representation of all the world s languages When you call getBinaryValues, the SDK gives you the values exactly as they are stored in the directory If you call getStringValues, the SDK attempts to convert the values into Java String objects, which are in UCS2 (another Unicode format), before returning them If the data cannot be converted, which might be the case with the value of a jpegPhoto attribute, for example, then getStringValues returns null
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You should type in the code or load it from the CD-ROM and compile, using the following command:
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javac FilterSearchjava
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Let s execute some searches and see what different lters return:
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java FilterSearch localhost 389 "" "" "o=airiuscom" "(cn=sam carter)" java FilterSearch localhost 389 "" "" "o=airiuscom" "(cn=Sam Carter)"
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These two commands will return the same single record, demonstrating that case does not matter in a search for the common name (which is de ned in the LDAP server as a case-insensitive attribute):
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dn: uid=scarter, ou=People, o=airiuscom cn: Sam Carter mail: scarter@airiuscom telephoneNumber: +1 408 555 4798
Now let s try a more complex search lter The following request will return a series of results You will get all members whose names begin with sam, tony, or the letter J