java - 将 JSONObject 转换为 HashMap<String, String>

Question

我有一个JSONObject这样的结构：

"data": {

   "title": "Pool Party",

   "date": {

       "start": "2018-08-14T15:44:44.625Z",

       "end": "2018-08-14T18:44:44.625Z"

}

我想把它转换成

HashMap<String, String>

对于“日期”字段下的“开始”和“结束”字段，有没有一种方法可以以相同的方式构建地图？

我尝试使用Gson如下方式转换它：

Type type = new TypeToken<Map<String, String>>(){}.getType();

HashMap<String, String> params = Gson().fromJson(jsonString, type);

但我收到了这个错误：

com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected a string but was BEGIN_OBJECT

可能是因为我的JSON字符串的结构

有没有办法得到这样的东西？谢谢您的帮助。

Answer 1

您可以使用 ObjectMapper 来转换它。public void testJackson() throws IOException {&nbsp;&nbsp;&nbsp; &nbsp; ObjectMapper mapper = new ObjectMapper();&nbsp;&nbsp; &nbsp; String json = "{"data": {"title": "Pool Party","date": {"start": "2018-08-14T15:44:44.625Z", "end": "2018-08-14T18:44:44.625Z"}}}";&nbsp;&nbsp; &nbsp; TypeReference<HashMap<String,Object>> typeRef&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = new TypeReference<HashMap<String,Object>>() {};&nbsp; &nbsp; HashMap<String,Object> o = mapper.readValue(from, typeRef);&nbsp;&nbsp; &nbsp; System.out.println("Got " + o);&nbsp;}

Answer 2

尝试这样的事情：public void testJackson() throws IOException {&nbsp; &nbsp; ObjectMapper mapper = new ObjectMapper();&nbsp; &nbsp; String json = "{\"data\": {\"title\": \"Pool Party\",\"date\": {\"start\":\"2018-08-14T15:44:44.625Z\", \"end\":\"2018-08-14T18:44:44.625Z\"}}}";&nbsp; &nbsp; TypeReference<HashMap<String, Object>> typeRef = new TypeReference<HashMap<String, Object>>() {&nbsp; &nbsp; };&nbsp; &nbsp; HashMap<String, Object> o = mapper.readValue(from, typeRef);&nbsp; &nbsp; System.out.println("Got " + o);}