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Creating QR Code ISO/IEC18004 in Java Communicating with Other Servers

Communicating with Other Servers
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Catalog search output illustrating USD-CAD exchange rates obtained from CGI resource
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In jspInit(), the JSP page uses an HTTP GET request for the USD-CAD exchange rate offered by the parent company It reads the single line result and converts this into a double Later on, prices (in whole cents) are read from the database and converted to dollars to two decimal places The exchange rate is then applied to get the Canadian dollar equivalent, which is rounded to the nearest five cents
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<%@ page session="false" %> <%@ page import="javaio*" %> <%@ page import="javanet*" %> <%@ page import="javasql*" %> <%@ page import="javatext*" %> <%! private static double EXCHANGE_RATE; // Get the US to Canadian dollar exchange rate public void jspInit()
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JSP: The Complete Reference
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{ try { URL url = new URL( "http://u25nv/cgi-bin/currency/GetRatecgi" + " c1=USD" + "&c2=CAD"); BufferedReader in = new BufferedReader( new InputStreamReader( urlopenStream())); String line = inreadLine(); inclose(); EXCHANGE_RATE = DoubleparseDouble(line); } catch (IOException e) { eprintStackTrace(); } } %> <% // Get search string String search = requestgetParameter("search"); if (search == null) search = ""; search = searchtrim(); // Connect to database String DRIVER = "orgenhydrainstantdbjdbcidbDriver"; String DB_URL = "jdbc:idb:" + "D:/lyricnote/WEB-INF/database/products/dbprp"; ClassforName(DRIVER); Connection con = null; try { con = DriverManagergetConnection(DB_URL); // Create a query using the search string PreparedStatement stmt = conprepareStatement ("select itemcode, price, description"
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Communicating with Other Servers
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+ " from products" + " where description like "); stmtsetString(1, "%" + search + "%"); // Run the query and display the results ResultSet rs = stmtexecuteQuery(); %> <HTML> <HEAD> <TITLE>Catalog Search</TITLE> </HEAD> <BODY> <IMG SRC="images/lyric_notepng"> <HR WIDTH="500" ALIGN="LEFT" COLOR="#005A9C"> <H3>Catalog Search Results</H3> <FORM> <INPUT TYPE="TEXT" NAME="search" VALUE="<%= search %>"> <INPUT TYPE="SUBMIT" VALUE="Search Again"> </FORM> <TABLE BORDER="1" CELLPADDING="5" CELLSPACING="0"> <TR> <TH>Item</TH> <TH>Price<BR>(USD)</TH> <TH>Price<BR>(CAD)</TH> <TH>Description</TH> </TR> <% NumberFormat fmt = NumberFormatgetCurrencyInstance(); while (rsnext()) { String itemCode = rsgetString(1); double price = rsgetDouble(2) / 100; double price_c = ((long)(price * EXCHANGE_RATE * 20 + 05)) / 200; String description = rsgetString(3); %> <TR> <TD><A HREF="productDetailjsp itemCode=<%= itemCode %>" ><%= itemCode %></A></TD> <TD ALIGN="RIGHT"><%= fmtformat(price) %></TD> <TD ALIGN="RIGHT"><%= fmtformat(price_c) %></TD> <TD><%= description %></TD>
JSP AND OTHER WEB COMPONENTS
JSP: The Complete Reference
</TR> <% } %> </TABLE> </BODY> </HTML> <% } finally { if (con != null) conclose(); } %>
Sending Mail from a JSP Page
The product support system case study in 19 glossed over a procedural difficulty When a problem is routed to a support person, how does that person know The developers and testers can read the current list of problems for products they support, but they don t know when a new one appears unless they happen to be looking for it When a customer is waiting, having the appropriate support personnel notified by some active process is especially important This situation is made to order for e-mail Notification by e-mail from within a program isn t always a good idea, especially if hard-coded addresses are used, which eventually become out-of-date In this case, however, the identities of the support persons and their e-mail addresses are obtained from the product support database Because e-mail is a familiar mechanism for which the infrastructure already exists, it s a good solution to this problem
Approaches to Sending Mail
Several options exist for sending e-mail from within an application This section considers three: I SMTP using sockets I The sunnetsmtpSmtpClient class I The JavaMail API
21:
Communicating with Other Servers
SMTP
The simplest approach is to use the Simple Mail Transfer Protocol (SMTP) over TCP/IP sockets Dating back to 1982, SMTP is one of the oldest Internet protocols It employs a small set of text commands to supply the e-mail parameters: HELO MAIL RCPT DATA QUIT Identifies the sender domain Identifies the sender Identifies the recipient More than one RCPT command may be used Indicates the beginning of the message body Everything up to the next line with by itself is part of the body Terminates the session
An example of an SMTP session is shown here (lines sent by the client are indicated by boldface):
220 plutolyricnotecom ESMTP Sendmail 893/893; Mon, 29 Jan 2001 06:58:24 -0500 (EST) HELO lyricnotecom 250 plutolyricnotecom Hello dialuprdulyricnotecom [209170132190], pleased to meet you MAIL FROM: phanna@lyricnotecom 250 phanna@lyricnotecom Sender ok RCPT TO: phanna@lyricnotecom 250 phanna@lyricnotecom Recipient ok DATA 354 Enter mail, end with "" on a line by itself SUBJECT: Mail Test This is a test of the mail system This is only a test Beeeeeeeeeeeeeeeeeeeeeeeep This concludes the test of the mail system 250 UAA07253 Message accepted for delivery QUIT 221 plutolyricnotecom closing connection
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