GT's Blog: Java : Html form parser return map of (name,value) pair of input attribute

Simple HTML Form Parser which parses the given string of HTML and returns Map of (name,value) pair of form's input attribute.

CODE : MyHtmlFormParser class

import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class MyHtmlFormParser {

private static String testHtml = "<html>  <body>    <h2>      Enter Following Details.    </h2>    <form id=\"myform\" name=\"myform\">      <table>      <tr>          <td>            UserName :          </td>          <td>            <input name=\"username\" type=\"text\" value=\"somevalue\">          </td>        </tr>      </table>    </form>  </body></html>";

public static void main(String[] args) {
    parseHtml(testHtml);
}
private static   Map<String, String> parseHtml(String html) {
    Matcher matcher;
    Map<String, String> parameters;
    // pull out all parameters in the form
    parameters = new HashMap<String, String>();
    matcher = inputPattern.matcher(html);
    while (matcher.find()) {
        Map<String, String> attributes = parseAttributes(matcher.group(1));
        // ignore buttons
        String type = attributes.get("type");
        if (type != null
                && (type.equalsIgnoreCase("submit") || type
                        .equalsIgnoreCase("button"))) {
            continue;
        }
        String name = attributes.get("name");
        if (name != null) {
            String value = attributes.get("value");
            if (value == null) {
                value = "";
            }
            parameters.put(name, value);
            System.out.println("Key  : "+name+"  , value : "+value);
        }
    }
    return parameters;
}

private static Map<String, String> parseAttributes(String attributesStr) {
    Map<String, String> attributes = new HashMap<String, String>();
    Matcher matcher = attributePattern.matcher(attributesStr);
    while (matcher.find()) {
        String key = matcher.group(1);
        String value = "";
        String g = matcher.group(2).trim();
        if (g != null) {
            value = g;
        }
        System.out.println(key + " ,  " + value);
        attributes.put(key, value.trim());
    }
    return attributes;
}
/**
 * The regex pattern used to find a form element in HTML.
 */
private static final Pattern formPattern = Pattern.compile("<form(.*?)>", Pattern.CASE_INSENSITIVE | Pattern.DOTALL);
/**
 * The regex pattern to find a form input parameter in HTML.
 */
private static final Pattern inputPattern = Pattern.compile("<input(.*?)>", Pattern.CASE_INSENSITIVE | Pattern.DOTALL);

private static final Pattern attributePattern = Pattern.compile("(\\w+)=\"(.*?)\"");

}

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Java : Html form parser return map of (name,value) pair of input attribute

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