用GSon生成器和JSon文件填充Java类
我想用一个外部JSon文件填充一个Java类,并使用Gson Builder。但是我的Java类将不会由我在JSon文件中声明的值填充。有什么问题?谢谢你的帮助 这是我的Json文件:用GSon生成器和JSon文件填充Java类,java,gson,Java,Gson,我想用一个外部JSon文件填充一个Java类,并使用Gson Builder。但是我的Java类将不会由我在JSon文件中声明的值填充。有什么问题?谢谢你的帮助 这是我的Json文件: { "tstamp": "2012-11-21 18:00", "id": 123, "publicationList": [ { "id": "1L", "state": "PublicationState.IMMEDIATELY", "channel":
{
"tstamp": "2012-11-21 18:00",
"id": 123,
"publicationList": [
{
"id": "1L",
"state": "PublicationState.IMMEDIATELY",
"channel": "PublicationChannel.TIMETABLE",
"startDate": "2001-12-17 18:00",
"endDate": "2001-12-17 18:00"
},
{
"id": "2L",
"state": "PublicationState.IMMEDIATELY",
"channel": "PublicationChannel.NVS",
"startDate": "2001-12-17 18:00",
"endDate": "2001-12-17 18:00"
},
{
"id": "3L",
"state": "PublicationState.IMMEDIATELY",
"channel": "PublicationChannel.NVS",
"startDate": "2001-12-17 18:00",
"endDate": "2001-12-17 18:00"
}
]
}
这是我的Gson生成器和Gson实例创建者:
Gson gson = new GsonBuilder()
.setDateFormat("yyyy-MM-dd HH:mm")
.registerTypeAdapter(Publication.class,
new PublicationInstanceCreator()).create();
public class PublicationInstanceCreator implements
InstanceCreator<PublicationDto> {
@Override
public PublicationDto createInstance(Type type) {
return new PublicationDto();
}
}
你的错误是什么?代码中也缺少主POJO对象 假设此对象是
出版物
,则只需使用
Publications p = new GsonBuilder().setDateFormat("yyyy-MM-dd HH:mm").create().fromJson(json, Publications.class);
你的适配器无法工作。另外,我认为带“L”的ID也不起作用(去掉L),GSon会将数字转换为正确的长类型
Publications p = new GsonBuilder().setDateFormat("yyyy-MM-dd HH:mm").create().fromJson(json, Publications.class);