杰克逊 JSON 字段映射大写？

json java jackson

2022-08-31 15:59:17

我不清楚杰克逊如何处理映射字段中的大写。如果有人能帮忙，我将不胜感激。

{"user":{"username":"user@host.com","password":"pwd","sendercompid":"COMPID","service":{"host":"address","port":6666,"service":"S1","serviceAsString":"s1"}},"MDReqID":"ghost30022","NoRelatedSym":1,"Symbol":["GOOG"],"MarketDepth":"0","NoMDEntryTypes":3,"MDEntryType":["0","1","2"],"SubscriptionRequestType":"1","AggregatedBook":"N"}:

以上是我的json，下面是我的例外...

com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "MDReqID" (class com.myco.qa.fixrest.MarketDataRequest), not marked as ignorable (10 known properties: , "mdreqID", "marketDepth", "user", "subscriptionRequestType", "aggregatedBook", "mdentryType", "symbol", "mdupdateType", "noRelatedSym", "noMDEntryTypes"])

以上是我的例外，下面是我的班级...

public class MarketDataRequest {
    private User user;
    private String MDReqID;
    private char SubscriptionRequestType;
    private int MarketDepth;
    private int MDUpdateType;
    private char AggregatedBook;
    private int NoMDEntryTypes;
    private ArrayList<Character> MDEntryType;
    private int NoRelatedSym;
    private ArrayList<String> Symbol;

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }

    public String getMDReqID() {
        return MDReqID;
    }

    public void setMDReqID(String MDReqID) {
        this.MDReqID = MDReqID;
    }

    public char getSubscriptionRequestType() {
        return SubscriptionRequestType;
    }

    public void setSubscriptionRequestType(char subscriptionRequestType) {
        SubscriptionRequestType = subscriptionRequestType;
    }

...等等

答案 1

由于您的 setter 方法被命名为 Jackson，因此假定该变量是由于 Java 命名约定而命名的（变量应以小写字母开头）。setMDReqID(…)mDReqID

如果你真的想要一个大写字母，请在 setter 上使用 @JsonProperty 注释（或者 - 对于序列化 - 在 getter 上），如下所示：

@JsonProperty("MDReqID")
public void setMDReqID(String MDReqID) {
    this.MDReqID = MDReqID;
}

答案 2

你也可以做

@JsonNaming(PropertyNamingStrategy.UpperCamelCaseStrategy.class)

上，将 JSON 消息中的所有属性名称大写