JSP insider

The current enterprise application has been transferred from 2-Tier towards 3-Tier structures, and developers have many different ways to distribute applications and data to users. JSP API is part of J2EE, which provides a simple but powerful mechanism to create a variety of applications for Web and Java developers. JSP provides two important capabilities to developers: 1. It provides mechanisms to access remote data such as EJB, RMI, JDBC. Second, it allows developers to achieve maximum code reuse and flexibility from the logic of the performance from the performance. Separation of logic and performance is a major advantage that transcends other web application structures. In this article, I will have an overall description of JSP technology, of course, there will be some examples to demonstrate the advantages of JSP. First, how JSP is executed to support JSP, and the web server must have a corresponding configuration. The popular web server supported by JSP is: WebSphere, JWEBServer, JSWDK, JRUN, TOMCAT, and more. When the web server receives a request for the ".jsp" page, it triggers the JSP engine. The JSP engine first checks the JSP file is new or modified, and the file will be translated and compiled with the files. Translation is the core of how JSP works: The JSP engine takes a JSP file to convert it to Java servlet. Then use the standard JVA compiler to compile the servlet, and perform the Java Servlet using the standard API. This translation step is also a slow reason why JSP is slow.

Write a JSP an example of a JSP as follows:

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</ textarea> </ p> <input type = submit name = "submit" value = "submit"> </ form> </ body> </ html> mailbean.java source code as follows: / / MailBean.java package ybwen; import java.io. *; import sun.net.smtp *;. public class MailBean {String sender; String recipient; String body; public void setSender (String s) {sender = s;} public Void setRecipient (string s) {recipient = s;} public void setbody (string s) {body = s;} / ** * @returns true if the message wssent, false} ** / public boolean sendMessage () {TRY {// replace "smtp" with your own SMTP server's name SmtpClient client = new SmtpClient ( "smtp"); // use the SmptClient instance to construct the message client.from (sender); client.to (recipient); PrintStream msg = Client.StartMessage (); msg.println ("Subject: web feedback"); msg.println (); msg.println (body); msg.println ("-"); msg.println ("Send Using Mailbean ! "); CLIE NT.closeServer ();} catCH (ooException e) {return false;} Return true;}} database connection The following source code shows a JSP file using JDBC from the database. Of course, direct embedding JDBC calls in JSP is the simplest method for obtaining data, but the better way is to encapsulate JDBC calls in JavaBean, similar to the previous example.</p></div><div class="text-center mt-3 text-grey"> 转载请注明原文地址:https://www.9cbs.com/read-9026.html</div><div class="plugin d-flex justify-content-center mt-3"></div><hr><div class="row"><div class="col-lg-12 text-muted mt-2"><i class="icon-tags mr-2"></i><span class="badge border border-secondary mr-2"><h2 class="h6 mb-0 small"><a class="text-secondary" href="tag-2.html">9cbs</a></h2></span></div></div></div></div><div class="card card-postlist border-white shadow"><div class="card-body"><div class="card-title"><div class="d-flex justify-content-between"><div><b>New Post</b>(<span class="posts">0</span>) </div><div></div></div></div><ul class="postlist list-unstyled"> </ul></div></div><div class="d-none threadlist"><input type="checkbox" name="modtid" value="9026" checked /></div></div></div></div></div><footer class="text-muted small bg-dark py-4 mt-3" id="footer"><div class="container"><div class="row"><div class="col">CopyRight © 2020 All Rights Reserved </div><div class="col text-right">Processed: <b>0.051</b>, SQL: <b>9</b></div></div></div></footer><script src="./lang/en-us/lang.js?2.2.0"></script><script src="view/js/jquery.min.js?2.2.0"></script><script src="view/js/popper.min.js?2.2.0"></script><script src="view/js/bootstrap.min.js?2.2.0"></script><script src="view/js/xiuno.js?2.2.0"></script><script src="view/js/bootstrap-plugin.js?2.2.0"></script><script src="view/js/async.min.js?2.2.0"></script><script src="view/js/form.js?2.2.0"></script><script> var debug = DEBUG = 0; var url_rewrite_on = 1; var url_path = './'; var forumarr = {"1":"Tech"}; var fid = 1; var uid = 0; var gid = 0; xn.options.water_image_url = 'view/img/water-small.png'; </script><script src="view/js/wellcms.js?2.2.0"></script><a class="scroll-to-top rounded" href="javascript:void(0);"><i class="icon-angle-up"></i></a><a class="scroll-to-bottom rounded" href="javascript:void(0);" style="display: inline;"><i class="icon-angle-down"></i></a></body></html><script> var forum_url = 'list-1.html'; var safe_token = 'cSkkh1Mio1PuBQuL6zWrwi0t986DElV_2Fhv87wVxDh3b7pzTatlIogdR0AIbftwx2a_2BHauf_2BdC2j2LGLe'; var body = $('body'); body.on('submit', '#form', function() { var jthis = $(this); var jsubmit = jthis.find('#submit'); jthis.reset(); jsubmit.button('loading'); var postdata = jthis.serializeObject(); $.xpost(jthis.attr('action'), postdata, function(code, message) { if(code == 0) { location.reload(); } else { $.alert(message); jsubmit.button('reset'); } }); return false; }); function resize_image() { var jmessagelist = $('div.message'); var first_width = jmessagelist.width(); jmessagelist.each(function() { var jdiv = $(this); var maxwidth = jdiv.attr('isfirst') ? first_width : jdiv.width(); var jmessage_width = Math.min(jdiv.width(), maxwidth); jdiv.find('img, embed, iframe, video').each(function() { var jimg = $(this); var img_width = this.org_width; var img_height = this.org_height; if(!img_width) { var img_width = jimg.attr('width'); var img_height = jimg.attr('height'); this.org_width = img_width; this.org_height = img_height; } if(img_width > jmessage_width) { if(this.tagName == 'IMG') { jimg.width(jmessage_width); jimg.css('height', 'auto'); jimg.css('cursor', 'pointer'); jimg.on('click', function() { }); } else { jimg.width(jmessage_width); var height = (img_height / img_width) * jimg.width(); jimg.height(height); } } }); }); } function resize_table() { $('div.message').each(function() { var jdiv = $(this); jdiv.find('table').addClass('table').wrap('<div class="table-responsive"></div>'); }); } $(function() { resize_image(); resize_table(); $(window).on('resize', resize_image); }); var jmessage = $('#message'); jmessage.on('focus', function() {if(jmessage.t) { clearTimeout(jmessage.t); jmessage.t = null; } jmessage.css('height', '6rem'); }); jmessage.on('blur', function() {jmessage.t = setTimeout(function() { jmessage.css('height', '2.5rem');}, 1000); }); $('#nav li[data-active="fid-1"]').addClass('active'); </script>