servlet getParameterMap()到普通map

public Map returnMap(){
Map properties = request.getParameterMap();
// 返回值Map
Map returnMap = new HashMap();
Iterator entries = properties.entrySet().iterator();
Map.Entry entry;
String name = "";
String value = "";
while (entries.hasNext()) {
entry = (Map.Entry) entries.next();
name = (String) entry.getKey();
Object valueObj = entry.getValue();
if (null == valueObj) {
value = "";
} else if (valueObj instanceof String[]) {
String[] values = (String[]) valueObj;
for (int i = 0; i < values.length; i++) {
value = values[i] + ",";
}
value = value.substring(0, value.length() - 1);
} else {
value = valueObj.toString();
}
returnMap.put(name, value);
}
return returnMap;
}