map[0]=text1&map[1]=text2...

<select id ="map" name="map" size="5" multiple required>

[key1=value1,key2=value2]

     public static Map<String, Boolean> convertToHashMap(String str) {
         
        Map<String, Boolean> map = (Map<String, Boolean>) new HashMap<String, Boolean>(){

            @Override
            public Boolean get(Object key) {
                Boolean value = super.get(key);
                if(value == null) return Boolean.FALSE;
                return value; 
            }
        };
        
        if(StringUtils.isEmpty(str)) return map;
        
        String s = str.replaceAll("\\[", "").replaceAll("\\]", "");
        String[] entryes = s.split(",");
        for (int i = 0; i < entryes.length; i++) {
            String[] entry = entryes[i].split("=");
            String key = entry[0].replaceAll(" ", "").trim();
            Boolean value = Boolean.parseBoolean(entry[1].replaceAll(" ", "").trim());
            map.put(key, value);
        }
        return map;
    }