{"id":197,"date":"2007-09-06T00:00:00","date_gmt":"2007-09-06T00:00:00","guid":{"rendered":"http:\/\/www.strongd.net\/?p=197"},"modified":"2007-09-06T00:00:00","modified_gmt":"2007-09-06T00:00:00","slug":"Logic Match Tag (...<\/logic:match >) ","status":"publish","type":"post","link":"https:\/\/www.strongd.net\/?p=197","title":{"rendered":"Logic Match Tag (…<\/logic:match >)"},"content":{"rendered":"

match tag –<\/FONT> We use this tag to evaluate the contents contained in the nested body parts of this tag if the specified value is an appropriate substring of the requested variable.<\/I><\/FONT><\/H3>
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This tag matches the variable specified as a String against the specified constant value. If the value is a substring  then the nested body content of this tag is evaluated.<\/FONT><\/P>
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Attributes of match<\/B> Tag<\/B><\/FONT><\/P>
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Attribute Name<\/FONT><\/TH>
\n		Description<\/FONT><\/TH><\/TR><\/THEAD>
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cookie<\/B><\/FONT><\/TD>
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The variable to be matched is the value of the cookie whose name is specified by this attribute.<\/FONT><\/P><\/TD><\/TR>
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header<\/B><\/FONT><\/TD>
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The variable to be matched is the value of the header whose name is specified by this attribute. The name match is performed in a case insensitive manner.<\/FONT><\/P><\/TD><\/TR>
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location<\/B><\/FONT><\/TD>
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If not specified, a match between the variable and the value may occur at any position within the variable string. If specified, the match must occur at the specified location (either start<\/CODE> or end<\/CODE>) of the variable string.<\/FONT><\/P><\/TD><\/TR>
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name<\/B><\/FONT><\/TD>
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The variable to be matched is the JSP bean specified by this attribute, if property<\/CODE> is not specified, or the value of the specified property of this bean, if property<\/CODE> is specified.<\/FONT><\/P><\/TD><\/TR>
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parameter<\/B><\/FONT><\/TD>
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The variable to be matched is the first, or only, value of the request parameter specified by this attribute.<\/FONT><\/P><\/TD><\/TR>
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property<\/B><\/FONT><\/TD>
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The variable to be matched is the property (of the bean specified by the name<\/CODE> attribute) specified by this attribute. The property reference can be simple, nested, and\/or indexed.<\/FONT><\/P><\/TD><\/TR>
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scope<\/B><\/FONT><\/TD>
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The bean scope within which to search for the bean named by the name<\/CODE> property, or “any scope” if not specified.<\/FONT><\/P><\/TD><\/TR>
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value<\/B><\/FONT><\/TD>
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The constant value which is checked for existence as a substring of the specified variable.<\/FONT><\/P><\/TD><\/TR><\/TBODY><\/TABLE>
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 <\/P>
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Logic notMatch  Tag (<logic:notMatch  >…<\/logic:notMatch  >) <\/FONT><\/H1>
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notMatch<\/FONT><\/STRONG> – We use this tag to evaluate the contents contained in the nested body parts of this tag if the specified value is not a substring of the requested variable.
<\/I><\/FONT><\/H3>
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This tag matches<\/FONT> the variable specified by one of  attributes (as a String) against the specified constant value. If the value is not a substring  the nested body content of this tag is evaluated.<\/FONT><\/P>
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Attributes of notMatch <\/B> Tag<\/B><\/FONT><\/P>
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Attribute Name<\/FONT><\/TH>
\n		Description<\/FONT><\/TH><\/TR><\/THEAD>
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cookie<\/B><\/FONT><\/TD>
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The variable to be matched is the value of the cookie whose name is specified by this attribute.<\/FONT><\/P><\/TD><\/TR>
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header<\/B><\/FONT><\/TD>
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The variable to be matched is the value of the header whose name is specified by this attribute. The name match is performed in a case insensitive manner.<\/FONT><\/P><\/TD><\/TR>
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location<\/B><\/FONT><\/TD>
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If not specified, a match between the variable and the value may occur at any position within the variable string. If specified, the match must occur at the specified location (either start<\/CODE> or end<\/CODE>) of the variable string.<\/FONT><\/P><\/TD><\/TR>
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name<\/B><\/FONT><\/TD>
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The variable to be matched is the JSP bean specified by this attribute, if property<\/CODE> is not specified, or the value of the specified property of this bean, if property<\/CODE> is specified.<\/FONT><\/P><\/TD><\/TR>
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parameter<\/B><\/FONT><\/TD>
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The variable to be matched is the first, or only, value of the request parameter specified by this attribute.<\/FONT><\/P><\/TD><\/TR>
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property<\/B><\/FONT><\/TD>
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The variable to be matched is the property (of the bean specified by the name<\/CODE> attribute) specified by this attribute. The property reference can be simple, nested, and\/or indexed.<\/FONT><\/P><\/TD><\/TR>
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scope<\/B><\/FONT><\/TD>
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The bean scope within which to search for the bean named by the name<\/CODE> property, or “any scope” if not specified.<\/FONT><\/P><\/TD><\/TR>
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value<\/B><\/FONT><\/TD>
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The constant value which is checked for existence as a substring of the specified variable.<\/FONT><\/P><\/TD><\/TR><\/TBODY><\/TABLE>
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 <\/H2>
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Example Illustrating the use of the Match <logic:match > and the notMatch  <logic:notMatch  > logic tags.<\/FONT><\/H2>
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Here you will learn to use the Struts  Logic tags. We will cover an example that will show  a comparison between  the two logic tags (ie..<logic:match > and the <logic:notMatch>).<\/FONT><\/P>
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Example code<\/B><\/FONT><\/P>
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Creating an <\/FONT><\/B>Action  Class<\/B><\/FONT><\/P>
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Develop a simple action class <\/FONT>LogicAction.java.<\/FONT><\/CODE><\/P>
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package<\/FONT> <\/FONT><\/B>roseindia.net;

import <\/B>java.io.*;
import <\/B>java.util.*;

\/**<\/FONT><\/CODE>
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* @author Amit Gupta
* @Web http:\/\/www.roseindia.net
* @Email struts@roseindia.net

<\/A>**\/
import <\/B>javax.servlet.http.HttpServletRequest;
import <\/B>javax.servlet.http.HttpServletResponse;
import <\/B>javax.servlet.ServletException;
import <\/B>org.apache.struts.action.*;

public class <\/B>LogicAction extends <\/B>Action 
{
  public <\/B>ActionForward execute(ActionMapping mapping,
    ActionForm form,
    HttpServletRequest request,
    HttpServletResponse response)
    throws <\/B>IOException, ServletException {

      

        return <\/B>mapping.findForward(“success”);
    }
}<\/FONT><\/CODE><\/P><\/TD><\/TR><\/TBODY><\/TABLE><\/DIV><\/TD><\/TR><\/TBODY><\/TABLE><\/DIV>
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Creating Form Bean<\/FONT><\/B><\/P>
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Our form bean class contains only one property text<\/B>. Here is the code of FormBean <\/FONT>(<\/FONT>Logic<\/FONT><\/CODE>Form<\/CODE>.java)<\/FONT><\/P>
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package <\/B><\/FONT>roseindia.net;<\/FONT>

import <\/B><\/FONT>org.apache.struts.action.*;<\/FONT>

\/**

* @author Amit Gupta
* @Web http:\/\/www.roseindia.net
* @Email struts@roseindia.net
<\/A>
**\/
<\/FONT><\/CODE>
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import <\/B><\/FONT>javax.servlet.http.HttpServletRequest;<\/FONT>
import <\/B><\/FONT>javax.servlet.http.HttpServletResponse;<\/FONT>

public class <\/B><\/FONT>EmptyForm <\/FONT>extends <\/B><\/FONT>ActionForm <\/FONT>
{<\/FONT>
    <\/FONT>
    <\/FONT>private <\/B><\/FONT>String text = <\/FONT>“”<\/FONT>;<\/FONT>
       <\/FONT>
  <\/FONT>public <\/B><\/FONT>String getText() <\/FONT>
    <\/FONT>{<\/FONT>
        <\/FONT>return <\/B><\/FONT>text;<\/FONT>
    <\/FONT>}<\/FONT>
    <\/FONT>
    <\/FONT>public void <\/B><\/FONT>setText(String text) <\/FONT>
    <\/FONT>{<\/FONT>
    <\/FONT>this<\/B><\/FONT>.text=text;<\/FONT>
  <\/FONT>}<\/FONT>
   <\/FONT>
    <\/FONT>
  <\/FONT>
    <\/FONT>
}<\/FONT><\/CODE><\/P><\/TD><\/TR><\/TBODY><\/TABLE><\/DIV><\/TD><\/TR><\/TBODY><\/TABLE><\/DIV>
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Defining form Bean in struts-config.xml file<\/FONT><\/B><\/P>
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Add the following entry in the struts-config.xml file for defining the form bean<\/FONT><\/P>
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<form-bean name=”LogicForm<\/CODE>”  type=”roseindia.net.LogicForm<\/CODE>” \/><\/FONT><\/TD><\/TR><\/TBODY><\/TABLE><\/DIV>
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 Developing the Action Mapping in the struts-config.xml
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Here, Action mapping helps to select the method from the Action class for specific requests.<\/FONT><\/P>
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<action path=”\/LogicAction”
type=”roseindia.net.LogicAction”
name=”LogicForm”
scope=”request”
input=”\/pages\/InputLogic.jsp”>
<forward name=”success” path=”\/pages\/output.jsp”\/>
<\/action><\/FONT><\/TD><\/TR><\/TBODY><\/TABLE><\/DIV>
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Developing the<\/FONT> <\/FONT>InputLogic.jsp<\/FONT> page<\/FONT><\/P>
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<%@ taglib uri=”\/tags\/struts-html” prefix=”html” %>
<%@ taglib uri=”\/tags\/struts-logic” prefix=”logic” %>

<html:html>
<head>
<title>Using &lt;logic&gt; Tags<\/title>
<\/head>

<body>
<h1>Using &lt;logic&gt; Tags<\/h1>

<html:form action=”\/LogicAction” method =”post”>

<h2>Enter text:<\/h2>
<html:text property=”text”\/>

<br>
<h4>The &lt;logic:match&gt;tag works if the entered <\/h4>
<h4>text contains “amit”<\/h4>
<h4>The &lt;logic:notMatch&gt;tag always evaluate the <\/h4>
<h4>entered text against the”abc” value<\/h4>
<br>

<html:submit value=”Submit”\/>


<html:cancel\/>
<\/html:form>
<\/body>
<\/html:html><\/FONT><\/TD><\/TR><\/TBODY><\/TABLE><\/DIV>
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Developing the <\/FONT>output.jsp<\/FONT> page<\/FONT><\/P>
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Notice the values<\/B><\/FONT><\/P>
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<%@ taglib uri=”\/tags\/struts-bean” prefix=”bean” %>
<%@ taglib uri=”\/tags\/struts-logic” prefix=”logic” %>

<HTML>
<HEAD>
<TITLE>Here’s Your Data…<\/TITLE>
<\/HEAD>

<BODY>
<H4>Here’s Your Data…<\/H4>

<h4>The text entered is:

<bean:write name=”LogicForm” property=”text”\/><\/h4>


<\/FONT><logic:match<\/B> name=”LogicForm” property=”text” value=”amit”<\/B>>
<h5>Using the tag &lt;logic:match &gt; <\/h5> 
Result : entered text contains “amit”
<\/logic:match<\/B>>



<logic:notMatch<\/B> name=”LogicForm” property=”text” value=”abc”<\/B>>
<h5>Using the tag&lt;logic:notMatch&gt;<\/h5> 
Result: entered text does not contains “abc”
<\/logic:notMatch<\/B>>
<\/FONT>
<\/BODY>
<\/HTML><\/FONT><\/TD><\/TR><\/TBODY><\/TABLE><\/DIV>
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Add the following line in the <\/FONT>index.jsp<\/FONT> to call the form.<\/FONT><\/P>
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<li>
<html:link page=”\/pages\/InputLogic.jsp”>Struts File Upload<\/html:link>
<br>
Example demonstrates  how LogicAction Class works.
<\/li>
<\/FONT><\/P>
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Building and Testing the Example <\/FONT><\/B><\/P>
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To build and deploy the application go to Struts\\Strutstutorial directory and type ant on the command prompt. This will deploy the application. Open the browser and navigate to the InputLogic.jsp <\/B>page. Your browser displays the following  page.<\/FONT><\/P>
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Writing text including “amit” and excluding “abc” to the InputLogic.jsp <\/B>page displays the working of  the  match Logic tag <logic:match > and the notMatch Logic tag <logic:notMatch > .<\/B><\/FONT><\/P>
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<\/TD><\/TR><\/TBODY><\/TABLE><\/DIV>
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It displays the following to the out.jsp <\/B>page<\/FONT><\/P>
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<\/TD><\/TR><\/TBODY><\/TABLE><\/DIV>
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Writing text including “amit” and  “abc” to the InputLogic.jsp <\/B>page displays the working of  the  match Logic tag <logic:match > and the notMatch Logic tag <logic:notMatch > .<\/B><\/FONT><\/P>
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<\/TD><\/TR><\/TBODY><\/TABLE><\/DIV>
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The<\/FONT> <logic:notEqual > evaluated here displays the <\/FONT>output.jsp<\/FONT> as<\/FONT><\/P>
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<\/TD><\/TR><\/TBODY><\/TABLE><\/DIV>
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<\/DIV><\/p>\n","protected":false},"excerpt":{"rendered":"

match tag – We use this tag to evaluate the contents contained in the nested body parts of this tag if the specified value is an appropriate substring of the requested variable. This tag matches the variable specified as a String against the specified constant value. If the value is a substring  then the nested … Continue reading Logic Match Tag (…<\/logic:match >)<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-197","post","type-post","status-publish","format-standard","hentry"],"_links":{"self":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/197","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=197"}],"version-history":[{"count":0,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/197\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=197"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=197"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=197"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}