我正在使用具有預期依賴項（Jackson、Hibernate 等）的 Spring Boot。我有一個名為 Buildings 的表，其中 Unit、Number、Street 等都是列。但我更喜歡解析它并將其作為我創建的名為“StreetAddress”的類返回。當我發送此 JSON 時，出現錯誤。"address": { "unit":"0101", "number":"19", "suffix":"STREET", "suburb":"Example", "state":"EXP", "streetName":"Example", "postCode":"400"}這是錯誤：Cannot construct instance of `com.App.Entity.Helpers.StreetAddress` (no Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator)我在我的建筑模型中將其作為 setAddress。有沒有我可以用來告訴杰克遜如何正確解析的注釋？private String subunit;private Integer number;private String streetname;private String suffix;private String suburb;private String state;private Integer postcode; public void setAddress(StreetAddress address) { this.subunit = address.getUnit(); this.number = address.getNumber(); this.streetname = address.getStreetName(); this.suffix = address.getSuffix().toString(); this.suburb = address.getSuburb(); this.state = address.getState().toString(); this.postcode = address.getPostCode(); }澄清：public class StreetAddress {private String unit;private Integer number;private String streetname;private StreetSuffix suffix;private String suburb;private AUState state;private Integer postcode;public StreetAddress(String unit, int number, String street, StreetSuffix suffix, String suburb, AUState state, int postcode) { this.unit = unit; this.number = number; this.streetname = street; this.suffix = suffix; this.suburb = suburb; this.state = state; this.postcode = postcode;}public String getUnit() { return unit;}public Integer getNumber() { return number;}public String getStreetName() { return streetname;}public String getSuffix() { return suffix.toString();}public String getSuburb() { return suburb;}public AUState getState() { return state;}public Integer getPostCode() { return postcode;}}
1 回答
慕無忌1623718
TA貢獻1744條經驗 獲得超4個贊
錯誤消息說 Jackson 不知道如何創建 type 的對象StreetAddress，因為它找不到合適的構造函數。Jackson 要么需要一個無參數的構造函數（在這種情況下它將通過分配字段或調用 setter 來傳遞 JSON 數據），要么需要一個帶有注釋的構造函數來告訴 Jackson 應該將哪個 JSON 屬性傳遞給哪個參數。
解決這個問題的最簡單方法就是不聲明構造函數，而是將字段公開：
public class StreetAddress {
public String unit;
// ... more fields here
}
或者，您可以將字段保持私有，但為每個字段聲明一個 setter：
public class StreetAddress {
private String unit;
// ... more fields here
public void setUnit(String unit) {
this.unit = unit;
}
// ... more setters here
}
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