Using either Java or Groovy, iterate through a hashmap and showcase an HTML table within a Velocity template

Question

Using either Java or Groovy, iterate through a hashmap and showcase an HTML table within a Velocity template

Just a heads up: Some users may have trouble reading code comments. For the record, this is not related to any homework assignment. I'm attempting to combine HTML and a hashmap for the first time. Despite searching for explanations online, nothing seems to be working for me. Whenever I use the "#" symbol, it gives me errors.

Objective: Use Groovy or Java to present an HTML table with HashMap results.
Pseudo Code: Please excuse any syntax errors and pay attention to the tr loop.

import groovy.xml.MarkupBuilder; // feel free to recommend another package

def hashmap = Collections.synchronizedMap(new HashMap());
hashmap = {Array1:['a','b','c'], Array2:[1,2,3]};

hashmap.each
{
    a1, a2 -> "${a1}: ${a2}"
    def target = a2['Array2'];

    StringWriter st = new StringWriter();
    def mkup = new MarkupBuilder(st);
    mkup.html
    {
     // Problem: Syntax error occurs when using "#", I don't know how to concatenate both objects

        #foreach( $t in $target ) 
        tr
        {
         $t.toString()
        }
        #end
    }

    String desiredOutput = st.toString();
}

Desired output:

<table>
    <tr>1</tr>
    <tr>2</tr>
    <tr>3</tr>
</table>

java html groovy hashmap velocity

Answer 1

Answer №1

Here is a simple way to define a hashmap in Groovy without using curly braces:

To display all entries in a map in a table, you can use the following code snippet.

import groovy.xml.MarkupBuilder
def hashmap = [Array1:['a','b','c'], Array2:[1,2,3]]
StringWriter writer = new StringWriter()
def builder = new MarkupBuilder(writer)
builder.html {        
   hashmap.collect{ key, valueList ->     
        table {
           valueList.collect {tr it}
        }
    }    
}
println writer.toString()

You can test this code online by visiting this demo link

Answer 2

Here is a simple way to define a hashmap in Groovy without using curly braces:

To display all entries in a map in a table, you can use the following code snippet.

import groovy.xml.MarkupBuilder
def hashmap = [Array1:['a','b','c'], Array2:[1,2,3]]
StringWriter writer = new StringWriter()
def builder = new MarkupBuilder(writer)
builder.html {        
   hashmap.collect{ key, valueList ->     
        table {
           valueList.collect {tr it}
        }
    }    
}
println writer.toString()

You can test this code online by visiting this demo link

Using either Java or Groovy, iterate through a hashmap and showcase an HTML table within a Velocity template

Answer №1

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