Question

我不清楚杰克逊如何处理绘图领域的大写。如果有人可以提供帮助，我会很感激。

{"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

Answer 1

由于您的setter方法名为setMDReqID(…)，因为Java命名约定（变量应以小写字母开头），Jackson假定变量名为mDReqID。如果你真的想要一个大写字母，请使用setter上的@JsonProperty annotation（或者 - 对于序列化 - 在getter上），如下所示：@JsonProperty("MDReqID")。

Answer 2

在setter上添加@JsonProperty，与您收到的Json字符串中的属性名称匹配。

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

此外，还会为getter添加@JsonProperty注释，以使输出以传统格式显示。

@JsonProperty("mDReqID")
public String getMDReqID() {
        return MDReqID;
}

您可以根据自己的喜好命名变量。

private String mdReqID;

Answer 3

您也可以

@JsonNaming(PropertyNamingStrategy.UpperCamelCaseStrategy.class)

在类上大写JSON消息中的所有属性名称

Answer 4

我遇到了同样的问题，尝试了UpperCamelCaseStrategy后仍然发生了此错误，该策略使我的字段pContent成为ObjectMapper属性Pcontent，因为不想为每个字段，只需最后使用gson代替

杰克逊JSON字段映射大写？

4 个答案: