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Thread: Question about JSP equivalent to PHP echo

  1. #1
    Join Date
    Oct 2008
    Location
    Bellevue, WA area
    Posts
    28

    Question about JSP equivalent to PHP echo

    Can anyone help me to convert the following PHP example into JSP? I know that I need to use out.print("something") but I'm unclear how I can incorporate my variable names prior to the variable values themselves.

    Here is the PHP code:

    Code:
    $result = "OK";
    $update = "1";
    $updateid = "90094";
    
    echo "result=".$result."\n";
    echo "update=".$update."\n";
    echo "updateid=".$updateid."\n";
    Here is my JSP conversion so far. I am not clear on how I mimic the variable name prior to the variable value itself.

    Code:
    <c:set var="result">OK</c:set>
    <c:set var="update">0</c:set>
    <c:set var="updateid">NULL</c:set>
    
    <%
    // Respond to the application with 1) result, 2) update, and 3) updateid values
    String result = "OK";
    String update= "0";
    String updateid= "NULL";
    
    out.print("result=" + result); 
    out.print("update=" + update); 
    out.print("updateid=" + updateid); 
    %>
    
    <p>You have the current version, version <c:out value="${versionmaj}"/>.<c:out value="${versionmin}"/>.<c:out value="${versionbld}"/> </p>
    Another question would be, given that I've already used EL to declare the variables above, it seems like I am creating more work than is necessary. Would it be possible and how then would I replicate the PHP echo using
    Code:
    <c:out value="${somevalue}"/>
    Would this work for that:
    Code:
    <c:out value="somevalue=" + ${somevalue} />

  2. #2
    Join Date
    Jun 2009
    Posts
    98
    Good try and I hope you find JSP/Servlets more useful compared to the PHP world.

    This will work:
    Code:
    <&#37;@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> 
    
    <c:set var="result" value="OK" />
    <c:set var="update" value="0" />
    <c:set var="updateid" value="NULL" />
    <c:set var="versionmaj" value="1" />
    <c:set var="versionmin" value="2" />
    <c:set var="versionbld" value="3" />
    
    Consider using JSTL only instead of scriptlets.
    <%
    // Respond to the application with 1) result, 2) update, and 3) updateid values
    String result = "OK";
    String update= "0";
    String updateid= "NULL";
    
    out.print("<br>result=" + result); 
    out.print("<br>update=" + update); 
    out.print("<br>updateid=" + updateid);
    %>
    
    <p>You have the current version, version <c:out value="${versionmaj}"/>.<c:out value="${versionmin}"/>.<c:out value="${versionbld}"/> </p>
    
    <c:out value="result=${result}" /><br>
    <c:out value="update=${update}" /><br>
    <c:out value="updateid=${updateid}" />
    Last edited by JavaServlet; 08-08-2009 at 10:22 PM.

  3. #3
    Join Date
    Oct 2008
    Location
    Bellevue, WA area
    Posts
    28
    Quote Originally Posted by JavaServlet View Post
    Good try and I hope you find JSP/Servlets more useful compared to the PHP world.

    Consider using JSTL only instead of scriptlets.
    <%
    // Respond to the application with 1) result, 2) update, and 3) updateid values
    String result = "OK";
    String update= "0";
    String updateid= "NULL";

    out.print("<br>result=" + result);
    out.print("<br>update=" + update);
    out.print("<br>updateid=" + updateid);
    %>
    Would you be willing to give me a example of how I would write out those string values so they output to the page as follows:

    Code:
    result=OK
    update=0
    updateid=NULL

  4. #4
    Join Date
    Oct 2008
    Location
    Bellevue, WA area
    Posts
    28
    What I meant to say was can you give me an example of how to write out those values using JSTL EL? I could just declare variables that include the entire length of the string and just write them out using <cut> but I would rather like to append the variables to their associated 'result=', 'update=', and 'updateid=' descriptors.

    Basically, converting this to JSTL. How would I do that?

    Code:
    out.print("<br>result=" + result);
    out.print("<br>update=" + update);
    out.print("<br>updateid=" + updateid);
    Thanks again.

  5. #5
    Join Date
    Jun 2009
    Posts
    98
    The below is an example that might help:

    Code:
    <c:set var="resultEqual" value="result=" />
    <c:set var="result" value="OK" />
    <c:set var="updateEqual" value="update=" />
    <c:set var="update" value="0" />
    <c:set var="updateidEqual" value="updateid=" />
    <c:set var="updateid" value="NULL" />
    
    
    jstl with html encoding similiar to the php htmlspecialchars:<br>
    <c:out value="${resultEqual}${result}" /><br>
    <c:out value="${updateEqual}${update}" /><br>
    <c:out value="${updateidEqual}${updateid}" /><br>
    
    without html encoding:<br>
    ${resultEqual}${result}<br>
    ${updateEqual}${update}<br>
    ${updateidEqual}${updateid}
    jstl looks alot better than outdated scriptlets.

  6. #6
    Join Date
    Oct 2008
    Location
    Bellevue, WA area
    Posts
    28
    Great. Thank you very much.

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