我有一個看起來像的 JSON，{ "person": { "name":"Sam", "surname":"ngonma" }, "car": { "make":"toyota", "model":"yaris" }}我正在使用以下幾行將其寫入 Amazon SQS，ObjectMapper mObjectMapper = new ObjectMapper();sqsExtended.sendMessage(new SendMessageRequest(awsSQSUrl, mObjectMapper.writeValueAsString(claim)));我有一個單獨的值數組，如果 JSON 在該數組中有它的值，我必須將該字段寫為null.如果我的字符串數組是["Sam", "Toyota"]我的最終 JSON 應該是這樣的，{ "person": { "name":null, "surname":"ngonma" }, "car": { "make":null, "model":"yaris" }}字符串數組是外部化的。它將來也可能具有其他價值。有人可以建議我一個很好的鏈接或想法來解決這個問題嗎？
1 回答
UYOU
TA貢獻1878條經驗 獲得超4個贊
我能想到的最靈活的方法是使用杰克遜的JsonAnyGetter注釋。它允許您向 Jackson 提供Map您的 pojo 狀態的表示。從 a 中過濾值Map可以以迭代方式完成。Map從包含s的 a 中過濾值Map可以遞歸方式完成。
這是我根據提供的問題構建的解決方案
public class Claim {
Map<String, Object> properties = new HashMap<>();
public Claim() {
// may be populated from instance variables
Map<String, String> person = new HashMap<>();
person.put("name", "Sam");
person.put("surname", "ngonma");
properties.put("person", person);
Map<String, String> car = new HashMap<>();
car.put("make", "Toyota");
car.put("model", "yaris");
properties.put("car", car);
}
// nullify map values based on provided array
public void filterProperties (String[] nullifyValues) {
filterProperties(properties, nullifyValues);
}
// nullify map values of provided map based on provided array
@SuppressWarnings("unchecked")
private void filterProperties (Map<String, Object> properties, String[] nullifyValues) {
// iterate all String-typed values
// if value found in array arg, nullify it
// (we iterate on keys so that we can put a new value)
properties.keySet().stream()
.filter(key -> properties.get(key) instanceof String)
.filter(key -> Arrays.asList(nullifyValues).contains(properties.get(key)))
.forEach(key -> properties.put(key, null));
// iterate all Map-typed values
// call this method on value
properties.values().stream()
.filter(value -> value instanceof Map)
.forEach(value -> filterProperties((Map<String, Object>)value, nullifyValues));
}
// provide jackson with Map of all properties
@JsonAnyGetter
public Map<String, Object> getProperties() {
return properties;
}
}
測試方法
public static void main(String[] args) {
try {
ObjectMapper mapper = new ObjectMapper();
Claim claim = new Claim();
claim.filterProperties(new String[]{"Sam", "Toyota"});
System.out.println(mapper.writeValueAsString(claim));
} catch (Exception e) {
e.printStackTrace();
}
}
輸出
{"car":{"model":"yaris","make":null},"person":{"surname":"ngonma","name":null}}
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