Gson解析数据为null的错误

数据

{"someFieldName":"xyz"}public class ExampleBean{    public String someFieldName;}

错误解析

    public static Gson getGson() {        return new GsonBuilder().setFieldNamingPolicy(        FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES).create();    }    public static <T> T json2Bean(String result , Class<T> clazz){        Gson gson = getGson();        T t = gson.fromJson(result, clazz);        return t;    }//解析代码ExampleBean bean=GsonUtil.json2Bean(response.data, ExampleBean.class);这里response.data是{"someFieldName":"xyz"}//解析结果为bean=null;

分析

查询没有报错，但是解出来为null，也不知道怎么调试。于是我就追查源码。结果发现问题出在FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES。  /**   * Using this naming policy with Gson will modify the Java Field name from its camel cased   * form to a lower case field name where each word is separated by an underscore (_).   *   * <p>Here's a few examples of the form "Java Field Name" ---> "JSON Field Name":</p>   * <ul>   *   <li>someFieldName ---> some_field_name</li>   *   <li>_someFieldName ---> _some_field_name</li>   *   <li>aStringField ---> a_string_field</li>   *   <li>aURL ---> a_u_r_l</li>   * </ul>   */  LOWER_CASE_WITH_UNDERSCORES() {    @Override public String translateName(Field f) {      return separateCamelCase(f.getName(), "_").toLowerCase(Locale.ENGLISH);    }  }

原来FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES会将”驼峰样式的参数someFieldName”解析为some_field_name。

解决方案

方案1、变量名字全部用小写。（服务器和客户端同时约定好为小写somefieldname）
方案2、客户端解析不采用FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES。

Gson gson = new Gson();ExampleBean bean=gson.fromJson(response.result, NewFlashDetailEntity.class);