Chapter 2 Call Javabean through Action
Add logic: Notpresent tag
Open the StrutSdemo1 project created in the previous section. Change hello.jsp to:
<% @ page contenttype = "text / html; charset = GBK"%>
<% @ Taglib Uri = "/ Tags / Struts-Bean" prefix = "bean"%>
<% @ Taglib URI = "/ Tags / Struts-HTML" prefix = "html"%>
<% @ Taglib Uri = "/ Tags / Struts-Logic" prefix = "logic"%>
Hello World </ Title></p>
<p><HTML: BASE /></p>
<p><body></p>
<p><H2> <bean: message key = "index.jsp.abc" /> </ h2></p>
<p><logic: NOTPRESENT Name = "stubean" scope = "request"></p>
<p>NOT Find Stubean.</p>
<p></ logic: NOTPRESENT></p>
<p></ body></p>
<p></ html: html></p>
<p>The above black body part means looking for objects named Stubean in the "Request" range, and if you can't find it, you can display "zhf - not find stubean.". Because we didn't pass any request to hello.jsp, the "zhf - not find stubean" will now be accessed now.</p>
<p>Add a javabean called StudentBean</p>
<p>Package hello;</p>
<p>Public class studentbean {</p>
<p>Private string name = NULL;</p>
<p>Public string getname () {</p>
<p>Return Name;</p>
<p>}</p>
<p>Public void setname (String name) {</p>
<p>THIS.NAME = Name;</p>
<p>}</p>
<p>}</p>
<p>Add logic: Present tag</p>
<p>Change hello.jsp to:</p>
<p><% @ page contenttype = "text / html; charset = GBK"%></p>
<p><% @ Taglib Uri = "/ Tags / Struts-Bean" prefix = "bean"%></p>
<p><% @ Taglib URI = "/ Tags / Struts-HTML" prefix = "html"%></p>
<p><% @ Taglib Uri = "/ Tags / Struts-Logic" prefix = "logic"%></p>
<p><html: html locale = "true"></p>
<p><title> Hello World </ Title></p>
<p><HTML: BASE /></p>
<p><body></p>
<p><H2> <bean: message key = "index.jsp.abc" /> </ h2> <logic: notpresent name = "stubean" scope = "request"></p>
<p>NOT Find Stubean.</p>
<p><log, forward name = "helloaction" /></p>
<p></ logic: NOTPRESENT></p>
<p><logic: present name = "stubean" scope = "request"></p>
<p>The Student Name: <bean: Write Name = "stubean" property = "name" /></p>
<p></ logic: present></p>
<p></ body></p>
<p></ html: html></p>
<p>The above black body part means that its Name property is displayed if an object called Stubean is found within the Request range. Of course, since we have not passed the Stubean object to Hello.jsp, "ZHF - Not Find Stubean." Will be displayed if you visit Hello.jsp.</p>
<p>Add a Action called HelloAction</p>
<p>First, use Eclipse's menu "Project | Properties | Java Build Path | Libraries", press the "Add Extenal Jars ..." button, add "C: / Javasoft / Tomcat 5.5 / Common / lib / servlet-api.jar" and "C : /Javasoft/struts/jakarta-struts 1.2.4/lib/ struts.jar. Then, create a category:</p>
<p>Package hello;</p>
<p>Import javax.servlet.http.httpservletRequest;</p>
<p>Import javax.servlet.http.httpservletResponse;</p>
<p>Import org.apache.struts.Apache.struts.action. *;</p>
<p>Public class helloaction extends action {</p>
<p>Public ActionForward Execute (ActionMapping MappingArg, Actionform Formarg,</p>
<p>HttpservletRequest Requestarg, httpservletResponse resqonsear) THROWS Exception {</p>
<p>// Having Passed The Validate</p>
<p>StudentBean JCL = New StudentBean ();</p>
<p>JCl.setname ("JCL");</p>
<p>Requestarg.setttribute ("Stubean", JCL);</p>
<p>Return mappingARG.FINDFORWARD ("Hello.jsp");</p>
<p>}</p>
<p>}</p>
<p>The Struts-Config.xml is then changed to:</p>
<p><? Xml Version = "1.0" encoding = "ISO-8859-1"?></p>
<p><! DocType struts-config public PUBLIC</p>
<p>"- // Apache Software Foundation // DTD Struts Configuration 1.2 // En"</p>
<p>"http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd"> <struts-config></p>
<p><global-forwards></p>
<p><forward name = "Hello.jsp" path = "/ hello.jsp" /></p>
<p><forward name = "helloaction" pat = "/ helloaction.do" /></p>
<p></ global-forwards></p>
<p><action-mappings></p>
<p><! - path is the path to this action, http://127.0.0.1:911/strutsdemo1/helloworld.do -></p>
<p><! - TYPE is the full class name of this action -></p>
<p><! - scope is the range of this action -></p>
<p><! - validate Indicates whether to perform verification -></p>
<p><! - INPUT is the forwarding path when verifying -></p>
<p><action</p>
<p>Path = "/ helloaction"</p>
<p>TYPE = "Hello.HelloAction"</p>
<p>Scope = "request"</p>
<p>Validate = "True"</p>
<p>Input = "/ hello.jsp"</p>
<p>/></p>
<p></ action-mappings></p>
<p><message-resources parameter = "resource.app-args" /></p>
<p></ Struts-Config></p>
<p>Note that the order in the label cannot be reversed. Struts application, then accessed "http://127.0.0.1:9111/strutsdemo1/helloaction.do", you will see "The Student Name: JCL" page. See below:</p></div><div class="text-center mt-3 text-grey">
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