An Introduction to Network Programming with Java: Java 7 Compatible

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Since the second one variation of this article, using the net and networks commonly has persisted to extend at a wonderful cost. This has ended in either a rise favorite for community software program and to advancements within the expertise used to run such networks, with the latter evidently resulting in adjustments within the former. in this time, the Java libraries were up to date to maintain with the hot advancements in community know-how, in order that the Java programming language is still one of many mainstays of community software program development.

In delivering a truly readable textual content that avoids getting immersed in low-level technical info, whereas nonetheless delivering an invaluable, useful consultant to community programming for either undergraduates and busy IT execs, this 3rd version maintains the fashion of its predecessors. To continue its forex, the textual content has been up-to-date to mirror adjustments that experience taken position in Java's community expertise during the last seven years (including the discharge of Java 7), while maintaining its impressive positive aspects of various code examples, screenshots and end-of-chapter exercises.

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Connection. close(); } } an easy instance servlet that uses an example of the above DAO type is proven less than. instance This servlet calls strategy getAcctDetails at the DAO item and monitors the consequences in an HTML desk. import myDAOs. *; import java. io. *; import java. util. *; import javax. servlet. *; import javax. servlet. http. *; import javax. servlet. annotation. WebServlet; import java. sql. *; import javax. sql. *; //*** be aware! *** import javax. naming. *; @WebServlet("/DataSourceTestServlet") public type DAOTestServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse reaction) throws ServletException, IOException { test { processRequest(request, response); } seize (SQLException sqlEx) { process. out. println("Error: " + sqlEx); sqlEx. printStackTrace(); } } public void doPost(HttpServletRequest request, HttpServletResponse reaction) throws ServletException, IOException { try out { processRequest(request, response); } trap (SQLException sqlEx) { process. out. println("Error: " + sqlEx); sqlEx. printStackTrace(); } } public void processRequest( HttpServletRequest request, HttpServletResponse reaction) throws ServletException, IOException, SQLException { reaction. setContentType("text/html"); PrintWriter out = reaction. getWriter(); out. println(""); out. println(""); out. println("DAO Test"); out. println(""); out. println("




"); out. println("

Account Details

"); out. println("

"); out. println(""); out. println( ""); out. println( ""); out. println( ""); out. println(""); AccountsDAO dao = null; test { dao = new AccountsDAO(); } seize (NamingException namEx) { method. out. println("Error: " + namEx); namEx. printStackTrace(); method. exit(1); } ArrayList accounts=dao. getAcctDetails(); int acctNum; String acctName; glide stability; String formattedBalance; ultimate int NUM_FIELDS = three; for (int i=0; i"); out. println(""); out. println(""); formattedBalance = String. format("%. 2f", balance); out. println(""); out. println(""); } out. println("
Acct. No. Acct. NameBalance
" + acctNum + "" + acctName + ""+formattedBalance+"
"); out. println("
"); out. println(""); out. println(""); out. close(); dao. close(); } } on the way to entry the above servlet, Tomcat needs to be all started, both by way of double-clicking on dossier startup. bat (in \bin) or by means of coming into the next command into an MS DOS command window (assuming that startup.

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