Read from a file into a JSP

Okay, so I'm trying to make a JSP for an ePortfolio for school. I'm setting it up so that if a user clicks on a link to one of my papers, the JSP (text.jsp) takes the parameter "ptitle" from the get or post request and retrieves the appropriate text from a pure text file stored in the same folder. (I know, I know, I should use a DB (?), but I'm pretty sure I don't have access right now.) Also, since this is heavy on the Java and light on the HTML, I'd like to use a servlet, but I'm not sure about my host's capabilities. So as a test, I've set up the following:
<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">
<html>
    <%@ page import="java.io.*" %>
    <%
        // String pageTitle = pageContext.getAttribute("ptitle");
        String pageTitle = "text.txt"; // this file is in the same folder as text.jsp
        String pageText = "If you are seeing this text, contact the webmaster at...";
        File pageFile = new File(pageTitle); // trying to wrap this file... I haven't worked with files like this much; if this is poorly done, let me know
        FileReader pageReader; // I'm using this for supposed convenience; I'll later change to Channels, I think
        char[] pageBuffer;
        StringBuffer pageTextBuffer;
        if(!pageFile.exists()) {
    %>
    <jsp:forward page="error.jsp">
        <jsp:param name="error" value="Page not found"/>
    </jsp:forward>
    <%
        else {
            pageReader = new FileReader(pageFile);
            pageBuffer = new char[100];
            pageTextBuffer = new StringBuffer();
            while(pageReader.read(pageBuffer) > (75)) { // better way?
                pageTextBuffer.append(pageBuffer);
            out.println(pageTextBuffer); // test the output; I get the error page. Oddly enough, it says that the value for parameter "error" is null (from the session and pageContext).
    %>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <h1>JSP Page</h1>
    </body>
</html>As commented, I get the error page. (It's wierd, because it has the text from the error page, but the URL is still ".../text.jsp" which is cool. Is the problem with the file reader, the JSP, or something else? Thanks for the help.
theAmerican

I would suggest not to use plain old io - quite evil and works quite unpredictably in web applications.
File paths in web apps should always be relative to the context root of your application rather than paths relative to the location of the file in the hard disk.
There are 2 ways to go about this - the inputstream linking to the file can be retrieved in 2 ways.
1. Using the ServletContext object's getResourceAsStream("filepath") method. The 'filepath' here is always relative to the root of your web application (which in turn is denoted by / ).
Thus if your file is stored in a folder called myFiles, which in turn is under your root folder (i.e, on the same level as WEB-INF) and your file is called, say, 'myText.txt', here's how you would obtain an InputStream object.
InputStream is = application.getResourceAsStream("/myFiles/myText.txt"); //in jsps
or
InputStream is = getServletContext().getResourceAsStream("/myFiles/myText.txt"); //in servlets2. Use the getResourceAsStream(filepath) method of the java.lang.Class object. This method picks up files as it picks up classes (i.e it searches the classpath). Now since the classes folder inside WEB-INF is by default included in the classpath, you will have to have your myFiles directory inside the classes folder. Then,
InputStream is = this.getClass().getResourceAsStream("/myFiles/myText.txt"); //in both jsps and servletswould return you an InputStream to that file.
Having got a handle to the InputStream using either #1 or #2, it's now a simple matter of wrapping up the streams for the 'read' functionality.
StringBuffer pageTextBuffer = new StringBuffer();
BufferedReader reader = new BufferedReader(new InputStreamReader(is)); //wrap your streams
String eachLine = null;
while((eachLine = reader.readLine()) != null){
pageTextBuffer.append(eachLine);
out.println(pageTextBuffer);cheers,
ram.

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在現實生活中，你和誰在一起的確很重要，甚至能改變你的成長軌跡，決定你的人生成敗。和什麼樣的人在一起，就會有什麼樣的人生。和勤奮的人在一起，你不會懶惰；和積極的人在一起，你不會消沈；與智者同行，你會不同凡響；與高人為伍，你能登上巔峰。

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DylanC,
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Pls. reward appropriate points

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I have a two and half year old satellite L500 with an Intel i-3 and 4 gigs of RAM, on which I was running Windows 7.
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When I use the windows Memory Diagnostic to get into the Windows Boot Manager Screen I get the following;
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Satellite L655-S5096
Downloads here.
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Message Edited by altenbach on 06-11-2007 11:57 AM
LabVIEW Champion . Do more with less code and in less time .
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Read from text file vi won't read file...

I am very new to LV programming so I hope you forgive any stupid mistakes I am making.   I am using Ver. 8.2 on an XP machine.
I have a small program that stores small data sets in text files and can update them individually or read and update them all sequentially, sending the data out a USB device.   Currently I am just using two data sets, each in their own small text file. The delimiter is two commas ",,".
The program works fine as written when run in the regular programming environment. I noticed, however, as soon as I built it into a project that the one function where it would read each file sequentially to update both files the read from text file vi would return an empty data set, resulting in blank values being written back into the file. I read and rewrite the values back to the text file to place the one updated field (price) in it'sproper place. Each small text file is identified and named with a 4 digit number "ID".   I built it twce, and get the same result. I also built it into an installer and unfortunately the bug travelled into the installation as well.
Here is the overall program code in question:
Here is the reading and parsing subvi:
If you have any idea at all what could cause this I would really appreciate it!
Solved!
Go to Solution.

Hi Kiauma,
Dennis beat me to it, but here goes my two cents:
First of all, it's great to see that you're using error handling - that should make troubleshooting a lot easier. By any chance, have you observed error 7 when you try to read your files and get an empty data set? (You've probably seen that error before - it means the file wasn't found)
If you're seeing that error, the issue probably has something to do with this:
Relative paths differ in an executable. This knowledge base document sums it up pretty well. To make matters more confusing, if you ever upgrade to LabVIEW 2009 the whole scheme changes. Also, because an installer contains the executable, building the installer will always yield the same results.
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Jim

Scenario to read from txt-file and create a sales order

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</Msg>
This is my final atom :
<?xml version="1.0" encoding="UTF-8"?><xsl:stylesheet xmlns:b1e="urn:com.sap.b1i.sim:b1event" xmlns:b1ie="urn:com.sap.b1i.sim:b1ievent" xmlns:bfa="urn:com.sap.b1i.bizprocessor:bizatoms" xmlns:jdbc="urn:com.sap.b1i.adapter:jdbcadapter" xmlns:rfc="urn:sap-com:document:sap:rfc:functions" xmlns:sim="urn:com.sap.b1i.sim:entity" xmlns:utils2="com.sap.b1i.bpc_tools.Utilities" xmlns:vpf="urn:com.sap.b1i.vplatform:entity" xmlns:xci="urn:com.sap.b1i.xcellerator:intdoc" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0" bfa:force="" vpf:force="" jdbc:force="" rfc:force="" b1ie:force="" b1e:force="" xci:force="" sim:force="" utils2:force=""><xsl:output method="xml" encoding="UTF-8" indent="yes"></xsl:output><xsl:param name="atom"></xsl:param><xsl:param name="sessionid"></xsl:param><xsl:variable name="msg" select="/vpf:Msg/vpf:Body/vpf:Payload[./@Role='S']"></xsl:variable><xsl:variable name="vpSender" select="/vpf:Msg/vpf:Header/vpf:Sender/@Id"></xsl:variable><xsl:variable name="vpObject" select="/vpf:Msg/vpf:Header/vpf:Sender/@ObjId"></xsl:variable><xsl:variable name="vpReceiver" select="/vpf:Msg/vpf:Header/vpf:ReceiverList/vpf:Receiver[./@handover='P']/@Id"></xsl:variable><xsl:template match="/">
<Msg xmlns="urn:com.sap.b1i.vplatform:entity">
<xsl:copy-of select="/vpf:Msg/@*"></xsl:copy-of>
<xsl:copy-of select="/vpf:Msg/vpf:Header"></xsl:copy-of>
<Body>
<xsl:copy-of select="/vpf:Msg/vpf:Body/*"></xsl:copy-of>
<Payload Role="R" id="{$atom}">
<xsl:call-template name="transform"></xsl:call-template>
</Payload>
</Body>
</Msg>
</xsl:template><xsl:template name="transform">
<FinalAtomResult xmlns="">
<BOM>
<BO>
<AdmInfo>
<Object>17</Object>
<Version>2</Version>
</AdmInfo>
     <Documents>
     <row>
     <DocDate>
          <xsl:copy-of select="$msg/io/row[0]/col[2]/text()"></xsl:copy-of>
     </DocDate>
     <DocDueDate>
          <xsl:copy-of select="$msg/io/row[0]/col[5]/text()"></xsl:copy-of>
     </DocDueDate>
     <CardCode>KD10251</CardCode>
     <NumAtCard>
          <xsl:copy-of select="$msg/io/row[0]/col[1]/text()"></xsl:copy-of>
     </NumAtCard>
     <U_PMX_JD_COMP>32</U_PMX_JD_COMP>
     </row>
                      </Documents>
     <Document_Lines>
     <xsl:for-each select="$msg/io/row">
     <row>
     <BarCode>
          <xsl:copy-of select="$msg/io/row[*]/col[2]/text()"></xsl:copy-of>
     </BarCode>
     <Quantity>
          <xsl:copy-of select="$msg/io/row[*]/col[3]/text()"></xsl:copy-of>
     </Quantity>
     </row>
     </xsl:for-each>
     </Document_Lines>

Mike,
you were right, you may not specify the extension of a file.
Another thing i detected is that the loop of my data start with the index 1 instead of 0 !!!
In this scenario, i have to read all the lines of the file and each time i should do a SQL-query,
so that i can use the result to build my sales document.
Do you know if it this is possible or have you any idea how to do this ?
thx,
Mario

How to print the content in Reverse which is read from the file

i have written a program to display the content of the file using files concept. now the task is how to display it in reverse order i.e from last to first which is read from the file.

If it will all fit in memory read the file as you are doing now appending everything into a StringBuilder. Then use the reverse() method of that class to obtain your output.
http://java.sun.com/javase/6/docs/api/java/lang/StringBuilder.html#reverse()

How to read/write .CSV file into CLOB column in a table of Oracle 10g

I have a requirement which is nothing but a table has two column
create table emp_data (empid number, report clob)
Here REPORT column is CLOB data type which used to load the data from the .csv file.
The requirement here is
1) How to load data from .CSV file into CLOB column along with empid using DBMS_lob utility
2) How to read report columns which should return all the columns present in the .CSV file (dynamically because every csv file may have different number of columns) along with the primariy key empid).
eg: empid report_field1 report_field2
1 x y
Any help would be appreciated.

If I understand you right, you want each row in your table to contain an emp_id and the complete text of a multi-record .csv file.
It's not clear how you relate emp_id to the appropriate file to be read. Is the emp_id stored in the csv file?
To read the file, you can use functions from [UTL_FILE|http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14258/u_file.htm#BABGGEDF] (as long as the file is in a directory accessible to the Oracle server):
declare
    lt_report_clob CLOB;
    l_max_line_length integer := 1024;   -- set as high as the longest line in your file
    l_infile UTL_FILE.file_type;
    l_buffer varchar2(1024);
    l_emp_id report_table.emp_id%type := 123; -- not clear where emp_id comes from
    l_filename varchar2(200) := 'my_file_name.csv';   -- get this from somewhere
begin
   -- open the file; we assume an Oracle directory has already been created
    l_infile := utl_file.fopen('CSV_DIRECTORY', l_filename, 'r', l_max_line_length);
    -- initialise the empty clob
    dbms_lob.createtemporary(lt_report_clob, TRUE, DBMS_LOB.session);
    loop
      begin
         utl_file.get_line(l_infile, l_buffer);
         dbms_lob.append(lt_report_clob, l_buffer);
      exception
         when no_data_found then
             exit;
      end;
    end loop;
    insert into report_table (emp_id, report)
    values (l_emp_id, lt_report_clob);
    -- free the temporary lob
    dbms_lob.freetemporary(lt_report_clob);
   -- close the file
   UTL_FILE.fclose(l_infile);
end;This simple line-by-line approach is easy to understand, and gives you an opportunity (if you want) to take each line in the file and transform it (for example, you could transform it into a nested table, or into XML). However it can be rather slow if there are many records in the csv file - the lob_append operation is not particularly efficient. I was able to improve the efficiency by caching the lines in a VARCHAR2 up to a maximum cache size, and only then appending to the LOB - see [three posts on my blog|http://preferisco.blogspot.com/search/label/lob].
There is at least one other possibility:
- you could use [DBMS_LOB.loadclobfromfile|http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14258/d_lob.htm#i998978]. I've not tried this before myself, but I think the procedure is described [here in the 9i docs|http://download.oracle.com/docs/cd/B10501_01/appdev.920/a96591/adl12bfl.htm#879711]. This is likely to be faster than UTL_FILE (because it is all happening in the underlying DBMS_LOB package, possibly in a native way).
That's all for now. I haven't yet answered your question on how to report data back out of the CLOB. I would like to know how you associate employees with files; what happens if there is > 1 file per employee, etc.
HTH
Regards Nigel
Edited by: nthomas on Mar 2, 2009 11:22 AM - don't forget to fclose the file...

Reading from a file. How to ask the user for file name at run time????

I have the code to read from a file but my problem is how to prompt the user for the file name at run time.
import java.io.File;
import java.io.FileNotFoundException;
import java.util.InputMismatchException;
import java.util.Scanner;
public class FileRead {
    public static void main(String args[]) {
        Scanner scan = null;
        File file = new File("Results.txt");
        String number;
        try {
            scan = new Scanner(file);
            while (scan.hasNext()){
            number = scan.next();
            System.out.println(number);}
        catch (FileNotFoundException ex1){
            System.out.println("No such file");
        catch (IllegalStateException ex2){
            System.out.println("Did you close the read by mistake");
        catch (InputMismatchException ex){
            System.out.println("File structure incorrect");
        finally{
            scan.close();}
}Any hints would be greatly appreciated. Thank you in advance

I have read through some of the tutorials that you have directed me too and they are very useful, thank you. however there are still a few things that i am not clear about. I am using net beans 5.0 I have placed a text file named Results.txt into the project at the root so the program can view it.
When I use the code that you provided me with, does it matter where the file is, or will it look through everywhere on the hard drive to find a match?
This code compiles but at run time it comes up with this error
run-single:
java.lang.NoClassDefFoundError: NamedFile
Exception in thread "main"
Java Result: 1
BUILD SUCCESSFUL (total time: 3 seconds)
import java.util.Scanner;
import java.io.*;
class NamedFileInput
public static void main (String[] args) throws IOException
    int num, square;
    // this Scanner is used to read what the user enters
    Scanner user = new Scanner( System.in );
    String fileName;
    System.out.print("File Name: ");
    fileName = user.nextLine().trim();
    File file = new File( fileName );     // create a File object
    // this Scanner is used to read from the file
    Scanner scan = new Scanner( file );
    while( scan.hasNextInt() )   // is there more data to process?
      num = scan.nextInt();
      square = num * num ;
      System.out.println("The square of " + num + " is " + square);
}his is the code that i used. It is the same as the code you posted for me (on chapter 23 I/O using Scanner and PrintStream) Sorry im just really stuck on this!!

Read from a file into a JSP

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