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All class and instance members are declared:
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private LDAPConnection ld = null; static final private String[] ATTRS = {"jpegPhoto"}; // Size of image static final private Dimension dim = new Dimension( 144, 156 ); // Stores image for no LDAP photo private byte[] noLDAP; // Stores image for no file photo private byte[] noFile; // When user selects new file to send private byte[] newFilePhoto; // Track what we read for current display private String DNRead = ""; private String DNPswd = ""; // Get the working directory private String directory = SystemgetProperty("userdir"); private JTextField DNEntryField; private JPasswordField passwordField; private ImageIcon currentPhotoIcon; private JLabel currentPhoto; private JLabel newPhoto; private ImageIcon newPhotoIcon; private JButton saveNewBtn; private JButton loadNewBtn; }
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Execute the program, enter a DN and password, and click the Get Entry button You will be greeted with the display shown in Figure 6-2 If the entry already has a photograph stored, it will be displayed in the left pane Select any JPEG le off the local hard disk and click the Save New button to place it into the directory Images may also be displayed from the directory inside of a browser that can issue an LDAP query and display a JPEG photo that is returned (assuming security has not been set to prevent this viewing) After you save the entry, the screen will look like Figure 6-3 After the photograph is stored in the directory, a standard query by the browser will show the photograph with the entry Figure 6-4 shows the results of a sample browser query using an LDAP URL for the record used in Figures 6-2 and 6-3:
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ldap://localhost:389/uid%3Dbjensen%2Cou%3Dpeople%2Co%3Dairiuscom
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The LDAP URL format will be described in detail in 15 We must use URL encoding for commas and equal signs when pasting the LDAP URL into a browser
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Modifying an Existing Entry 135
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FIGURE 6-2 LDAP JPEG Photo Handler
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The Java language and its serialization model allow direct storage of Java objects within the directory To serialize an object means to convert its state into a byte stream in such a way that the byte stream can be converted back into a copy of the object Serialization is very useful if you want to persistently store a user s shopping cart or preferences for that user s browser session at your site
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FIGURE 6-3 After clicking Save New
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FIGURE 6-4 Browser view of photograph
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Servlets have become very popular for building applications on the Net The servlet model has a session architecture that allows the developer to serialize this information Once serialized, the information can be stored for the user inside the directory, and when the user returns to the site the previous session can be restored We will develop a servlet application using LDAP in 13 The stand-alone Java program that follows shortly demonstrates how to serialize data and store it in the directory Netscape Directory Server comes with a schema for storing Java objects If your directory does not include this schema, you can use the le jndi-object-schemaldif that comes with Directory SDK for Java (in the JNDI section) to add support for the schema elements that relate to Java object serialization This schema includes an object class, javaSerializedObject, that has the attributes javaClassName and javaSerializedData, among others, for storing this kind of data The javaClassName attribute stores the class name of the serialized object so that applications may determine the class without rst deserializing the object The javaSerializedData attribute stores the serialized data Even if we do
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Modifying an Existing Entry 137
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not use the value of the javaClassName attribute in the following block of code, it is a mandatory attribute for objects of the object class javaSerializedObject The SavePrefs program that follows serializes and deserializes data to and from the directory If the program is executed with the r option, it will read the data from the directory and deserialize it Executing the program with the w option will serialize a preferences object and write it to the directory The object written or read contains two integers and the current date and time
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import import import import javaio*; javautilDate; javautil*; netscapeldap*;
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/** * Read or write the serialized form of a preferences object * to the directory */ public class SavePrefs { private static final int NONE = 0; private static final int READ = 1; private static final int WRITE = 2; // Where to store the preferences private static final String PREFS_DN = "cn=savePrefs,ou=People,o=airiuscom"; private static final String ATTR_CLASS = "javaClassName"; private static final String ATTR_DATA = "javaSerializedData"; // Object classes of the preferences object private static final String[] PREFS_OC = { "top", "javaContainer", "javaSerializedObject" }; /** * Read or write the serialized form of a preferences * object to "cn=savePrefs,ou=People,o=airiuscom" * * @param args host, port, dn, authdn, password, * [r] | [w, x, y] */
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