利用Gson将Json 转化为Map，javaBean, List转换为json

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

将json字符串默拒成List

public List<UserInfoBean> userFromJson(String jsondata) {
Type listType = new TypeToken<List<UserInfoBean>>() {
}.getType();
Gson gson = new Gson();
List<UserInfoBean> list = gson.fromJson(jsondata, listType);
return list;
}

将List,Map转换成json

public String getJsonData(List<?> list) {
Gson gson = new Gson();
String jsonstring = gson.toJson(list);
return jsonstring;
}