Map相关 - 根据value获取key

/**
* 根据value获取key
*/
public static String getKeyByValue(String value, HashMap<String, String> map) {
String str = "";
for (String key : map.keySet()) {
String tvalue = map.get(key);
if (new String(value).equals(tvalue)) {
str = key + "";
}
}
return str;
}