How do you write an output in columns to an html table?

2801625 · Nov 24, 2014 1:10PM

Ive written two programs. My first program compares the difference of two text files and prints the differences in an output. My second program creates a simple Html table. I would like to write my output to this table. How would I go about doing this in java?

Thanks in advance for your help.

Aman Sachdeva · Nov 25, 2014 4:10PM

You have to use Servlet and JSP in java to achieve this thing.

In Servlet file, calculate the difference in two files just like you are doing in one of the programs.

In JSP file, you'll create an HTML table and then populate the data in the table

If you are very new to java and do not anything about Servlet and JSP, then you have to learn how they work in order to proceed further.

You can use these links to learn Servlets and JSP.

Official Documentation Link: JSP, If you want to skip the complete documentation this is other Link: Example

Official Documentation Link: Servlets If you want to skip the complete documentation this is other Link: Example

Other useful link: Follow me

TPD-Opitz · Nov 28, 2014 3:53AM

since you did not provide any example code it's hard to give any advice.

But, you state that your program already creates a HTML table.

How does it do this?

Is it simply outputting a single string with that simple HTML content?

The simplest approach is to split up that string an add more HTML content in a loop as needed:

StringBuilder htmlTable = new StringBuilder("<html><table>\n");
htmlTable.append("<th><td>number</td><td>double</td><td>square</td></th>\n");
for(int i=0;i<10;i++) {
htmlTable.append("<tr>");

htmlTable.append("<td>");
htmlTable.append(i);
htmlTable.append("</td>");

htmlTable.append("<td>");
htmlTable.append(i*2);
htmlTable.append("</td>");

htmlTable.append("<td>");
htmlTable.append(i*i);
htmlTable.append("</td>");

htmlTable.append("</tr>\n");
}
htmlTable.append("</table></html>");
System.out.println(htmlTable.toString());

Of cause there are smarter ways to do this, eg. using a template framework, but I guess this is appropriate to your skill level.

bye

TPD

2801625 · Dec 1, 2014 3:52PM

Thanks guys for the insight. Im very new to java so I'm a complete novice when it comes to writing code. What I came to realize was I needed to do was build a dynamic table. My issue was that I was building a static table and I couldint populate the table with my results. Below is an example of the code I wrote for my table. My apologies if didnt format my code correctly.

import java.io.BufferedWriter;

import java.io.File;

import java.io.FileWriter;

import java.io.IOException;

import java.util.Set;

public class HtmlDataTable {

public void writehtmltable(Set<String> filenameSet){

//creates table in the following path

File htmltable = new File("C:/Output.html");

try {

BufferedWriter bw = new BufferedWriter(new FileWriter(htmltable));

//write html data table

bw.write(htmltop);

for (String jarfilename:filenameSet){

String line="<tr> <td> </td> <td> </td> </td> <td>"+jarfilename + " </tr>";

bw.write(line);

}

bw.write(htmlbottom);

//close the resource

bw.close();

} catch (IOException e) {

e.printStackTrace();

}

private static String htmltop = "<!DOCTYPE html>\n"+

"<html>\n"+

"<head>"+

"<title>Jar Filename Existance Check</title>"+

"<style>"+

"table, th, td {"+

" border: 2px solid black;"+

"}"+

"</style>"+

"</head>"+

"<body>"+

"<table>\n"+

" <tr> <th colspan='100'>" +

"<h3><br>Jarfilename Existance Check</h3> </th> </tr>" +

"<th>POM File Data</th> <th>Lib Directory Files</th> <th>Missing Jarfiles</th>";

private static String htmlbottom = "</table></body></html>";

public static void main(String[] args) {

new HtmlDataTable().writehtmltable(null);

TPD-Opitz · Dec 1, 2014 4:37PM

what is it in your words that makes a HTML table dynamic instead of static?

Are you familiar with HTML or is this also something you are new to?

Do you know that, and if so why your java code outputs nothing?

bye

TPD

2801625 · Dec 2, 2014 11:48AM

Sorry I failed to include the entire code from my program. I have since edited my previous post.

I needed my table to have the ability to change based on the output I was trying to write to it.

The table I was able to create previously was fixed and my output wasnt being written to it.

This is the difference between the table being dynamic vs. static.

I truly appreciate all the feedback. Please keep in mind that I am a complete novice when it comes to Java.

I may not use the proper terminology in my explanations so please feel free to correct me when neccessary.

Thanks

TPD-Opitz · Dec 3, 2014 8:06AM

any Buffered* output class must be flushed before closing. So just befor close() call flush().

bye

TPD

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