How To Create Table In Email Body Using Java

This article is for creating simple HTML Styled Email using Java. Its difficult to manage HTML code in java. It will be clumsy when its needed to place some data in that HTML code. To avoid all these problems , I have created 3 simple steps

Prepare HTML mock-up of Email Body
Make your data ready in POJO class
Place your data in HTML code using TemplateMatcher

Prepare HTML mock-up

First of all, prepare your HTML Email mock-up by using any online HTML editor (codepen, cssdeck etc). Lets send student's progress report as email. Find below mock-up and HTML code for Email body

Mock-up

HTML Code

<div                                        style="padding:20px"> <h2>Progress Report</h2> <b>Student Name</b> : Srinivas Dasari<br/> <b>Role No</b> : 690752021<br/> <br/> <table                                        border="1"                                        style="border-collapse:collapse;text-align:center">   <tr>     <th                                        style="padding:5px">Subject</th>     <th                                        style="padding:5px">Grade</th>   </tr>   <tr>     <td>Mathmatics</td>     <td                                        style="color:blue">A</td>   </tr>    <tr>     <td>Science</td>     <td                                        style="color:orange">C</td>   </tr>   <tr>     <td>Economics</td>     <td                                        style="color:red">D</td>   </tr>  </table> </div>

Make your Data ready

To fill above mock-up we need student name, id and marks. Lets create pojo with those fields.

                                    public                                    class                                    ProgressReport                                    {                                    private                                    String                                    rollNo;                                    private                                    String                                    mathmatics;                                    private                                    String                                    name;                                    private                                    String                                    economics;                                    private                                    String                                    science;                                    public                                    String                                    getRollNo                                    ()     {                                    return                                    rollNo;     }                                    public                                    void                                    setRollNo                                    (String                                    rollNo)     {                                    this                                    .rollNo                                    =                                    rollNo;     }                                    public                                    String                                    getMathmatics                                    ()     {                                    return                                    mathmatics;     }                                    public                                    void                                    setMathmatics                                    (String                                    mathmatics)     {                                    this                                    .mathmatics                                    =                                    mathmatics;     }                                    public                                    String                                    getName                                    ()     {                                    return                                    name;     }                                    public                                    void                                    setName                                    (String                                    name)     {                                    this                                    .name                                    =                                    name;     }                                    public                                    String                                    getEconomics                                    ()     {                                    return                                    economics;     }                                    public                                    void                                    setEconomics                                    (String                                    economics)     {                                    this                                    .economics                                    =                                    economics;     }                                    public                                    String                                    getScience                                    ()     {                                    return                                    science;     }                                    public                                    void                                    setScience                                    (String                                    science)     {                                    this                                    .science                                    =                                    science;     } }

TemplateMatcher Introduction

Create string template using TemplateMatcher
Use that template in strings
Replace the template with suitable data

                                import                                jlibs.core.util.regex.TemplateMatcher;                                String                                msg                                =                                "Student Name : ${name}                                  \n                                  Student ID : ${id} ";                                TemplateMatcher                                matcher                                =                                new                                TemplateMatcher("${",                                "}");                                Map<String,                                  String>                                vars                                =                                new                                HashMap<String,                                  String>(); vars.put("name",                                "srinivas"); vars.put("id",                                "21");                                System                                .out.println(matcher.replace(msg, vars));

Output will be

Student Name : srinivas  Student ID : 21

Place Data in your HTML code

Its time to create templates in HTML and replace with pojo data. Lets create templates in HTML code.

<div                        style="padding:20px"> <h2>Progress Report</h2> <b>Student Name</b> : ${name}<br/> <b>Role No</b> : ${id}<br/> <br/> <table                        border="1"                        style="border-collapse:collapse;text-align:center">   <tr>     <th                        style="padding:5px">Subject</th>     <th                        style="padding:5px">Grade</th>   </tr>   <tr>     <td>Mathmatics</td>     <td                        style="color:blue">${mathmatics}</td>   </tr>    <tr>     <td>Science</td>     <td                        style="color:orange">${science}</td>   </tr>   <tr>     <td>Economics</td>     <td                        style="color:red">${economics}</td>   </tr>  </table> </div>

Use Convert HTML or Text to Javascript or Java variable - Online online tool to convert HTML into Java string, it is easier way.
Final code will be

                    ProgressReport                    pr                    =                    new                    ProgressReport(); pr.setName("srinivas"); pr.setRollNo("21"); pr.setMathmatics("A"); pr.setScience("C"); pr.setEconomics("D");                    StringBuilder                    body                    =                    new                    StringBuilder();  body.append("<div style=\"padding:20px\">")      .append("<h2>Progress Report</h2>")      .append("<b>Student Name</b> : ${name}<br/>")      .append("<b>Role No</b> : ${id}<br/>")      .append("<br/>")      .append("<table border=\"1\"                      style=\"border-collapse:collapse;text-align:center\">")      .append("  <tr>")      .append("    <th style=\"padding:5px\">Subject</th>")      .append("    <th style=\"padding:5px\">Grade</th>")      .append("  </tr>")      .append("  <tr>")      .append("    <td>Mathmatics</td>")      .append("    <td  style=\"color:blue\">${mathmatics}</td>")      .append("  </tr>")      .append("   <tr>")      .append("    <td>Science</td>")      .append("    <td style=\"color:orange\">${science}</td>")      .append("  </tr>")      .append("  <tr>")      .append("    <td>Economics</td>")      .append("    <td style=\"color:red\">${economics}</td>")      .append("  </tr> ")      .append("</table>")      .append("</div>");                    TemplateMatcher                    matcher                    =                    new                    TemplateMatcher("${",                    "}");                    Map<String,                      String>                    vars                    =                    new                    HashMap<String,                      String>(); vars.put("name", pr.getName()); vars.put("id", pr.getRollNo()); vars.put("mathmatics", pr.getMathmatics()); vars.put("science", pr.getScience()); vars.put("economics", pr.getEconomics());                    String                    emailBody                    =                    matcher.replace(body.toString(), vars);

Java function to Send Email

Just send email using below java function

                public                static                void                sendMail(String                mail,String                sub,String                mess) throws                AddressException,                MessagingException                {                Logger                .info(className,                "entering sendMail "                +mail);                Properties                props                =                new                Properties();         props.put("mail.smtp.host",                "smtp.gmail.com");         props.put("mail.smtp.socketFactory.port",                "465");         props.put("mail.smtp.socketFactory.class",                "javax.net.ssl.SSLSocketFactory");         props.put("mail.smtp.auth",                "true");         props.put("mail.smtp.port",                "465");                Session                session                =                Session                .getDefaultInstance(props,                new                javax.mail.Authenticator() {                protected                PasswordAuthentication                getPasswordAuthentication() {                return                new                PasswordAuthentication("enter your gmail here","enter your password here");                 }             });                MimeMessage                message                =                new                MimeMessage(session);             message.setFrom(new                InternetAddress("enter your email here"));             message.setRecipients(Message                .                RecipientType                                  .TO,                InternetAddress                .parse(mail));             message.setSubject(sub);             message.setContent(mess,                "text/html"                );                Transport                .send(message);                Logger                .info(className,                "leaving sendMail");     }