Question

以下是我的JSON：

{
  "-5": [
    "15:D1_CHANNEL_ID_SK",
    "23:D1_CALL_BEGIN_DATE",
    "87:D1_CELL_ID"
  ],
  "-4": [
    "31:I_RECHARGE_AMOUNT",
    "59:I_INBUNDLED_UNIT",
    "60:I_DAY_NIGHT_FLAG",
    "53:PD_UPSELL_PACK_ID",
    "146:AON"
  ]
}

在上面的Json中，键也是一个变量（它不是常数）。因此，我无法使用mapper.readValue()来解析json。

Answer 1

我假设通过mapper.readValue()，你试图在ObjectMapper的帮助下将字符串值读入类似结构的地图（可以是POJO或HashMap）。

以下代码从字符串中读取并将其转换为Map<String,Object>。

public static void main(String[] args) throws IOException {
    ObjectMapper objectMapper = new ObjectMapper();
    String data = "{\n" + "  \"-5\": [\n" + "    \"15:D1_CHANNEL_ID_SK\",\n" + "    \"23:D1_CALL_BEGIN_DATE\",\n" + "    \"87:D1_CELL_ID\"\n" + "  ],\n" + "  \"-4\": [\n" + "    \"31:I_RECHARGE_AMOUNT\",\n" + "    \"59:I_INBUNDLED_UNIT\",\n" + "    \"60:I_DAY_NIGHT_FLAG\",\n" + "    \"53:PD_UPSELL_PACK_ID\",\n" + "    \"146:AON\"\n" + "  ]\n" + "}";
    final Map<String, Object> response = objectMapper
            .readValue(data, objectMapper.getTypeFactory().constructMapType(Map.class, String.class, Object.class));
}

当然，地图中的值类型也可以是对象。在这种情况下，代码可能看起来像这样

public static void main(String[] args) throws IOException {
    ObjectMapper objectMapper = new ObjectMapper();
    String data = "{\n" + "  \"-5\": [\n" + "    \"15:D1_CHANNEL_ID_SK\",\n" + "    \"23:D1_CALL_BEGIN_DATE\",\n" + "    \"87:D1_CELL_ID\"\n" + "  ],\n" + "  \"-4\": [\n" + "    \"31:I_RECHARGE_AMOUNT\",\n" + "    \"59:I_INBUNDLED_UNIT\",\n" + "    \"60:I_DAY_NIGHT_FLAG\",\n" + "    \"53:PD_UPSELL_PACK_ID\",\n" + "    \"146:AON\"\n" + "  ]\n" + "}";
    final Map<String, Your Class Name> response = objectMapper
            .readValue(data, objectMapper.getTypeFactory().constructMapType(Map.class, String.class, <Your Class Name>.class));
}

还可以将值类型转换为另一种基于容器的类型（如List），我将其留给您进行探索。

Java中的Json解析（关键不是常数）

1 个答案: