map转map_java获取map的值

<!-- 配置gson -->
<dependency>
  <groupId>com.google.code.gson</groupId>
  <artifactId>gson</artifactId>
  <version>2.2.4</version>
</dependency>

public static void main(String[] args) {
    Map map = new HashMap<String,String>();
    map.put("a","a111");
    map.put("a1","a111");
    map.put("a2","a111");
    System.out.println("原:\t"+map);
    String s = map.toString();
    System.out.println("中:\t"+s);
    Map map_new = new Gson().fromJson(s, map.getClass());
    System.out.println("后:\t"+map_new);
}