Developing JSP + Javabeans using NetBeans, always resolution

xiaoxiao2021-03-06  205

When using NetBeans to develop JSP Javabeans, the book is turned on, according to JSP book ("JSP practical tutorial" Tsinghua University Press), the book is turned, and the word is said to be in accordance with the book, but When debugging, NetBeans did not know how much returned, and later found the reason.

The original JavaBeans source code is as follows: Circle.java

Public class circle {private int i; public circle () {i = 1;} public void setint (int J) {i = j;} public int getint () {Return i;}

And compile Circle.java Get Circle.class, WEB-INF / CLASSES / below

INDEX.JSP code is as follows:

<% @ Page Import = "Circle"%> counter </ title> </ head> <jsp: usebean id = "mybean" scope = "session" class = "circle" /> <body> <% int i = 1; myBean.setint (i );%></p> <p><p> mybean = <% = myBean.get ()%> </ p></p> <p></ body> </ html> When compiling, IMPORT CIRCLE = NULL</p> <p>Later, I made the following adjustments to perform correctly: Circle.java</p> <p>Package mypack; // pay attention to this sentence</p> <p>Public class circle {private int i; public circle () {i = 1;} public void setint (int J) {i = j;} public int getint () {Return i;}</p> <p>And the compiled circle.class is stored under Web-INF / CLASSES / MYPACK.</p> <p>INDEX.JSP is modified as follows:</p> <p><% @ page import = "mypack.circle"%> <html> <head> <title> counter </ title> </ head> <jsp: usebean id = "mybean" scope = "session" class = "mypack. Circle "/> <body> <% int i = 1; MyBean.setint (i );%></p> <p><p> mybean = <% = myBean.get ()%> </ p></p> <p></ body> </ html></p> <p>Then you can perform smoothly.</p> <p>Summary: Pay attention to the importance of Package when developing JSP, this is the only statement that is the only way to mark.</p></div><div class="text-center mt-3 text-grey"> 转载请注明原文地址:https://www.9cbs.com/read-128896.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="128896" 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>0.037</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 = 'nWOFKGXRFSOu4a4OQuWg_2BfVjr53pBlZUPwG4nIo_2FPhyR096xBvSZtXI2HuxUSSAbHf8aC_2FELEwqTC_2B_2FUH41k7g_3D_3D'; 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>