Hint: Use getAttribute to display the user details.
Solution:
The files used in this exercise are:
1. index.jsp
2. displayname.jsp
3. NameForm.java
4. NameAction.java
<%@ page language="java" %>
<%@ page language="java" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<html>
<head>
<title>Sample Struts Application</title>
</head>
<body>
<h3> User Details</h3>
<html:form action="Name" name="nameForm" type="example.NameForm" >
<table width="80%" border="0">
<tr>
<td><b>First Name:</b>
<html:text property="name" />
</td>
</tr>
<tr>
<td><b>Last Name:</b>
<html:text property="last" />
</td>
</tr>
<tr>
<td>
<b>Email: </b>
<html:text property="email" />
</td>
</tr>
<tr>
<td><html:submit />
</td>
</tr>
</table>
</html:form>
</body>
</html>
Enter the code in Notepad and save the file as index.jsp in %TOMCAT_HOME%/webapps/ details.
<html>
<head>
<title>Sample Struts Display Name</title>
</head>
<body>
<h2> Confirm the Details You Entered</h2>
<table width="80%" border="0">
<tr>
<td>
<b>First Name:</b><%= request.getAttribute("NAME") %>
</td>
</tr>
<tr>
<td>
<b>Last Name:</b><%= request.getAttribute("LAST") %>
</td>
</tr>
<tr>
<td>
<b>Email:</b><%= request.getAttribute("EMAIL") %></td>
</tr>
</table>
</body>
</html>
Enter the code in Notepad and save the file as displayname.jsp in %TOMCAT_HOME%/ webapps/details.
package example;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
public class NameForm extends ActionForm
{
private String name = null;
private String last = null;
private String email = null;
public String getName()
{
return (name);
}
public String getLast()
{
return (last);
}
public String getEmail()
{
return (email);
}
public void setName(String name)
{
this.name = name;
}
public void setLast(String last)
{
this.last = last;
}
public void setEmail(String email)
{
this.email = email;
}
public void reset(ActionMapping mapping, HttpServletRequest request)
{
this.name = null;
this.last= null;
this.email=null;
}
}
Enter the Java code in Notepad and save the file as NameForm.java. Compile the file from the command prompt and copy the class file in %TOMCAT_HOME%/webapps/details/WEB-INF/classes/example.
package example;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
public class NameAction extends Action
{
public ActionForward execute(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException
{
String target = new String("success");
String name=null;
String last=null;
String email=null;
if ( form != null )
{
NameForm nameForm = (NameForm)form;
NameForm lastForm = (NameForm)form;
NameForm emailForm = (NameForm)form;
name = nameForm.getName();
last = lastForm.getLast();
email = emailForm.getEmail();
}
if ( name == null )
{
target = new String("failure");
}
else
{
request.setAttribute("NAME", name);
request.setAttribute("LAST", last);
request.setAttribute("EMAIL", email);
}
return (mapping.findForward(target));
}
}
Enter the Java code in Notepad and save the file as NameAction.java. Compile the file from the command prompt and copy the class file in %TOMCAT_HOME%/webapps/details/WEB-INF/classes/example.
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE struts-config PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 1.1//EN"
"http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd">
<struts-config>
<!-- Form Bean Definitions -->
<form-beans>
<form-bean name="nameForm" type="example.NameForm"/>
</form-beans>
<!-- Action Mapping Definitions -->
<action-mappings>
<action path="/Name" type="example.NameAction" name="nameForm" input="/index.jsp">
<forward name="success" path="/displayname.jsp"/>
<forward name="failure" path="/index.jsp"/>
</action>
</action-mappings>
</struts-config>
Update the struts-config.xml file used in the Web application.
The output of the program is as shown in Figure 17.1.
Figure 17.1: Accepting User DetailsThe output of the program that displays user details is as shown in Figure 17.2.
Figure 17.2: Details Page
3 nhận xét:
Hi. Tell me below messages. please!!!
org.apache.jasper.JasperException: Mandatory TLD element missing or empty: tlib-version
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:51)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:409)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:116)
org.apache.jasper.compiler.TagLibraryInfoImpl.parseTLD(TagLibraryInfoImpl.java:280)
org.apache.jasper.compiler.TagLibraryInfoImpl.(TagLibraryInfoImpl.java:163)
org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:420)
org.apache.jasper.compiler.Parser.parseDirective(Parser.java:476)
org.apache.jasper.compiler.Parser.parseElements(Parser.java:1426)
org.apache.jasper.compiler.Parser.parse(Parser.java:133)
org.apache.jasper.compiler.ParserController.doParse(ParserController.java:216)
org.apache.jasper.compiler.ParserController.parse(ParserController.java:103)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:167)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:306)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:286)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:273)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:566)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
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