Daily Archives: December 3, 2013

Java Tweaks

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How to Avoid unnessecary HTML Code while generating HTML for Mail or HTML File

Method1

DataOutputStream dosReport = new DataOutputStream(new FileOutputStream(fileName));

dosReport.wrtiteBytes("<table><thead>");

dosReport.writeBytes("<th>Column1</th>");
dosReport.writeBytes("<th>Column2</th>");
dosReport.writeBytes("<th>Column3</th>");
dosReport.writeBytes("<th>Column4</th>");
dosReport.writeBytes("<th>Column5</th>");
dosReport.writeBytes("<th>Column6</th>");
dosReport.writeBytes("<th>Column7</th>");
dosReport.writeBytes("<th>Column8</th>");
dosReport.writeBytes("<th>Column9</th>");

dosReport.wrtiteBytes("</thead>");

Method2
Replace with Below


DataOutputStream dosReport = new DataOutputStream(new FileOutputStream(fileName));
dosReport.wrtiteBytes("<table><thead>");

String[] columns = {"Column1", "Column2", "Column3", 
                    "Column4", "Column5", "Column6", 
                    "Column7", "Column8", "Column9"};

for(int i = 0; i < columns.length; i++)
 dosReport.writeBytes("<th>" + columns[i] +"</th>");

dosReport.wrtiteBytes("</thead>");

Disadvantage:
In the Method1 you have fine control over individual cell(tds) so you can add properties like align, individual stylings can be applied.

How to read a file in java

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The below code reads a Sample.txt file and places the content in a newly created Html file Sample.html.

The file from which the content should be read is placed in a project directory which is printed in the console using the below java code.

System.out.println("Working Directory = " + System.getProperty("user.dir"));

The above code prints the current project directory in console.

package com.mugil.servlets;

import java.awt.Desktop;
import java.io.*;

class GenerateHTML 
{
    public static void main(String[] args) throws Exception 
    {    	
    	System.out.println("Working Directory = " +
                System.getProperty("user.dir"));
        BufferedReader br = new BufferedReader(new FileReader("Sample.txt"));
        File f = new File("source.htm");
        BufferedWriter bw = new BufferedWriter(new FileWriter(f));
        bw.write("<html>");
        bw.write("<body>");
        bw.write("<h1>ShowGeneratedHtml source</h1>");

        String line;
        while ((line=br.readLine())!=null) {
            bw.write(line);
            bw.newLine();
        }        
        bw.write("</body>");
        bw.write("</html>");

        br.close();
        bw.close();

        Desktop.getDesktop().browse(f.toURI());
    }
}