Form with Error Checking : Form Input Data « JSP « Java Tutorial

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Java Tutorial » JSP » Form Input Data

23.25.5.Form with Error Checking

index.jsp

<HTML>

<HEAD><TITLE>Implicit Object Project</TITLE></HEAD>



<BODY>



<FORM METHOD="POST" ACTION="StreamResponse.jsp">



<H2> Streaming file demo </H2>



<TABLE>

<TR>

 <TD> Enter File name: </TD>

 <TD> <INPUT TYPE="text" SIZE=60 NAME="File"> </TD>

</TR>

<TR>

 <TD> Enter optional MIME type: </TD>

 <TD> <INPUT TYPE="text" SIZE=30 NAME="MIME type"> </TD>

</TR>

</TABLE>



<P>



<INPUT TYPE=submit VALUE="Fetch">

<INPUT TYPE=reset VALUE="Reset">



</FORM>



</BODY>

StreamResponse.jsp

<%@ page isErrorPage="true" %>



<H3> Error occured: <%= exception.getMessage() %> </H3>

<%@ page import="java.io.*" errorPage="StreamError.jsp" %>

<%

    String filename = request.getParameter("File");

    String mime_type = request.getParameter("MIME type");

%>



<%

    if((mime_type != null) && (mime_type.length() > 0)) {

       response.setHeader("Content-Type", mime_type);  

    }

%>



<%

    String line = null;

    BufferedReader iread = new BufferedReader(new FileReader(filename));

    while((line = iread.readLine()) != null) {

       out.write(line);

    }



    iread.close();

%>

Download: JSPFormWithErrorChecking.zip( 4 k)

23.25.Form Input Data
	23.25.1.	Use Loop to Read Form Controls
	23.25.2.	Use For Each to Loop Through all Values Passed in by Form
	23.25.3.	Read Hidden Control in Same File
	23.25.4.	Pass Form Value to Bean
	23.25.5.	Form with Error Checking

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