There are many references in the servlet code to a JavaScript function called in Java

Painting QR Code in Java There are many references in the servlet code to a JavaScript function called
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doNothing This function is there to allow a result to be returned from clicking on a
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URL or Submit button It does not perform any function other than to prevent the action from occurring We intercept the action and call JavaScript functions instead A sample of the output from a search is shown in Figure 13-5 The photograph icon next to the entry for Barbara Jensen indicates that she has stored a photo in the directory Clicking on this icon will open a separate window with the photograph This action is handled by the routine that follows, which we use for all binary data types
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/** * Return binary data in an HTTP stream; * retrieve arguments from the req * * @param req the HTTP request
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456 Servlets and LDAP
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FIGURE 13-5 Sample search results
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* @param res the HTTP response * @param attr name of attribute in the LDAP directory to * return * @param name "friendly" name of the attribute to use for * transmitting an error message * @param mime MIME type for this binary data * @exception ServletException<BR> * @exception IOException<BR> */ private void binaryLDAP( HttpServletRequest req, HttpServletResponse res, String attr, String name, String mime ) throws ServletException, IOException { LDAPConnection ld; LDAPEntry theEntry = null; String[] attrs = {attr}; int err = 0; byte[] theData = null;
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// Get form arguments String theDN = readFormData(req,FLDNAME_DN)toLowerCase(); if ( theDNlength() == 0 ) { PrintWriter out = resgetWriter(); errorMessage(out,"Error with Distingushed Name"); return; } theDN = LDAPUrldecode(theDN); ld = getLDAPConn(); try { theEntry = ldread(theDN,attrs); theData = getBinaryValue(theEntry,attr); if ( theData == null ) { PrintWriter out = resgetWriter(); errorMessage(out, name + " for " + theDN + " not found!"); err = 1; } } catch ( LDAPException e ) { PrintWriter out = resgetWriter(); errorMessage(out,"Entry:" + theDN+" not found!"); err = 1; } finally { closeConnection(ld); } if ( err == 1 ) { return; } // Prepare to transmit binary data ressetContentType(mime); // Set to pre-expire ressetHeader( "Expires", "Tues, 01 Jan 1980 00:00:00 GMT"); ressetContentLength(theDatalength); ServletOutputStream sout = resgetOutputStream(); soutwrite(theData,0,theDatalength); soutflush(); soutclose(); return; }
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458 Servlets and LDAP
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/** * Builds an error HTML response page<BR> * @param out a stream back to client * @param errmsg the error message */ private void errorMessage( PrintWriter out, String errmsg ) { outprintln("<HTML><HEAD>"); outprintln("<TITLE>Phonebook Error</TITLE>"); outprintln("</HEAD>"); outprintln("<BODY><BR><BR>"); outprintln("<CENTER><H1>Error</H1></CENTER><BR>"); outprintln(errmsg); outprintln("<BR>Use the back button to correct"); outprintln("</BODY></HTML>"); return; }
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The checkInside method considers any machine for which the rst three octets match those of the servlet host to be internal Using part of the IP address to determine if the caller is from the outside is very site speci c, since your location may have different criteria for an internal versus external user The following code looks at the IP source address to decide
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/** * Report if client is inside or outside the firewall<BR> * This routine must be customized for each particular * site Currently it just matches the first three octets * of an IP address to determine if someone is inside the * company * @param req the HTTP request * @return true if inside firewall */ protected boolean checkInside( HttpServletRequest req ) { String clientIP = reqgetRemoteAddr(); boolean isInside = clientIPstartsWith( hostIP ); return isInside; }
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The following method is responsible for returning an LDAPConnection to the servlet It requests the connection from the pool we allocated at initialization and attaches the cache to the connection (if the cache is initialized) If no connections are available in the pool, then the pool will block until one becomes available There will also be a message in the log that the pool ran out of connections
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/** * Get an LDAPConnection from the pool, * and assign the LDAP cache to this connection * * @return a valid LDAPConnection */ private LDAPConnection getLDAPConn() { // Get connection from pool LDAPConnection ld = ldapPoolgetConnection(); if ( readCache != null ) { ldsetCache( readCache ); } return ld; }
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/** * Return an LDAPConnection to the pool * * @param ld the connection to return to the pool */ private void closeConnection( LDAPConnection ld ) { if ( ld != null ) { ldapPoolclose( ld ); } }
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/** * Returns the string representation of an LDAP attribute * from the specified entry * If the attribute is not present or has a zero length * value, then return "-" If the attribute has more than * one value, then just return the first one * * @param entry an LDAP entry * @param attrN name of the attribute (eg, "cn") * @return value of attribute or */ private String getValue( LDAPEntry entry, String attrN ) { return getValue( entry, attrN, "-" ); }
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