如何防止Gson将长数字（json字符串）转换为科学记数法格式？ [英] How to prevent Gson from converting a long number (a json string ) to scientific notation format?

问题描述

我需要将json字符串转换为java对象并将其显示为long。 json字符串是一个固定的长数组：

  {numbers 
 [268627104，485677888，506884800]} 
  

转换的代码在所有情况下都能正常工作，除了以0结尾的数字。它将这些转换为科学注释编号格式：

  public static Object fromJson（HttpResponse response，Class<？> classOf）
 throws IOException { 
 InputStream instream = response.getResponseInputStream（）; 
 
 Object obj = null; 
尝试{
读取器读取器=新的InputStreamReader（instream，HTTP.UTF_8）; 
 
 Gson gson = new Gson（）; 
 
 obj = gson.fromJson（reader，classOf）; 
 
 Logger.d（TAG，json  - >+ gson.toJson（obj））; 
} catch（UnsupportedEncodingException e）{
 Logger.e（TAG，unsupported encoding，e）; 
} catch（Exception e）{
 Logger.e（TAG，json parsing error，e）; 
} 
 
 return obj; 
} 
  

实际结果：
Java对象：268627104,485677888,5.068848 E + 8

注意最后一个数字转换为科学记数法格式。任何人都可以建议可以做些什么来解决它或防止它或撤消它？我使用的是Gson v1.7.1如果序列化为字符串是您的一个选项，您可以配置GSON来完成所以：

  GsonBuilder gsonBuilder = new GsonBuilder（）; 
 gsonBuilder.setLongSerializationPolicy（LongSerializationPolicy.STRING）; 
 Gson gson = gsonBuilder.create（）; 
  

这会产生类似于：

  {numbers：[268627104，485677888，506884800]} 
  

I need to convert json string to java object and display it as a long. The json string is a fixed array of long numbers:

{numbers
[ 268627104, 485677888, 506884800 ] }

The code to convert works fine in all cases except for numbers ending in 0. It converts those to a scientific notation number format:

   public static Object fromJson(HttpResponse response, Class<?> classOf)
    throws IOException {
    InputStream instream = response.getResponseInputStream();                   

    Object obj = null;
    try {
        Reader reader = new InputStreamReader(instream, HTTP.UTF_8);

        Gson gson = new Gson();

        obj = gson.fromJson(reader, classOf); 

        Logger.d(TAG, "json --> "+gson.toJson(obj));
    } catch (UnsupportedEncodingException e) {
        Logger.e(TAG, "unsupported encoding", e);
    } catch (Exception e) {
        Logger.e(TAG, "json parsing error", e);
    }

    return obj;
}

The actual result: Java object : 268627104, 485677888, 5.068848E+8

Notice the last number is converted to a scientific notation format. Can anyone suggest what could be done to work around it or prevent it or undo it? I'm using Gson v1.7.1

解决方案

If serializing to a String is an option for you, you can configure GSON to do so with:

GsonBuilder gsonBuilder = new GsonBuilder();
gsonBuilder.setLongSerializationPolicy( LongSerializationPolicy.STRING );
Gson gson = gsonBuilder.create();

This will produce something like:

{numbers : [ "268627104", "485677888", "506884800" ] }

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