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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