Form Helper

import java.util.HashMap;
import java.util.Map;

public class Form {

    public static String br() {
        return br(1);
    }

    public static String br(int size) {
        StringBuilder br = new StringBuilder();

        while (size-- > 0) {
            br.append("<br />");
        }

        return br.toString();
    }

    public static String open() {
        return open(null, null, null);
    }

    public static String open(String method) {
        return open(method, null);
    }

    public static String open(String method, String action) {
        return open(method, action, null);
    }

    public static String open(String method, String action, Map<String, String> params) {
        StringBuilder form = new StringBuilder();

        form.append("<form");
        if (params != null && params.containsKey("method")) {
            method = params.remove("method");
        }
        method = method != null ? method : "POST";
        form.append(" method='").append(method.toUpperCase()).append("'");

        if (params != null && params.containsKey("action")) {
            action = params.remove("action");
        }
        if (action != null) {
            form.append(" action='").append(action).append("'");
        }

        if (params != null) {
            for (Map.Entry<String, String> param : params.entrySet()) {
                form.append(" ").append(param.getKey()).append("='").append(param.getValue()).append("'");
            }
        }

        form.append(">");

        return form.toString();
    }

    public static String close() {
        return "</form>";
    }

    public static String input(String name) {
        return input(null, name);
    }

    public static String input(String type, String name) {
        return input(type, name, null);
    }

    public static String input(String type, String name, Map<String, String> params) {
        StringBuilder input = new StringBuilder();

        if (params != null && params.containsKey("type")) {
            type = params.remove("type");
        }
        type = type != null ? type : "text";
        input.append("<input type='").append(type).append("'");

        if (params != null && params.containsKey("name")) {
            name = params.remove("name");
        }
        if (name != null) {
            input.append(" name='").append(name).append("'");
        }

        if (params != null) {
            for (Map.Entry<String, String> param : params.entrySet()) {
                input.append(" ").append(param.getKey()).append("='").append(param.getValue()).append("'");
            }
        }

        input.append(">");

        return input.toString();
    }

    public static String submit(String value) {
        Map<String, String> params = new HashMap<>();

        params.put("value", value);

        return input("submit", null, params);
    }
}