使用jackson将单个java字段映射到两个JSON字段

Question

POJO中有一个isCase字段同时映射到case和is_case(这不是预期的(。删除@JsonProperty注释可以去掉json中的is_case字段，但is_case是它应该有的。将@JsonIgnore放在isCase上并不能消除响应json中的case。将isCase重命名为is_case确实消除了响应json中的case，但这似乎并不太正确。为什么Jackson会将一个java字段映射到两个字段？POJO是这样声明的：

public class CreateRuleResponse {
@JsonProperty(value = "rule_name", required = true)
private String name;
@JsonProperty("rule_num")
private String ruleNum;
@JsonProperty(value = "rule_category")
private RuleCategory ruleCategory;
@JsonProperty(value = "rule_status")
private RuleStatus ruleStatus;
@JsonProperty(value = "rule_channel_type")
private String ruleChannelType;
@JsonProperty("action")
private RuleAction ruleAction;
@JsonProperty("is_case")
private Boolean isCase;
public CreateRuleResponse() {
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getRuleNum() {
return ruleNum;
}
public void setRuleNum(String ruleNum) {
this.ruleNum = ruleNum;
}
public RuleCategory getRuleCategory() {
return ruleCategory;
}
public void setRuleCategory(RuleCategory ruleCategory) {
this.ruleCategory = ruleCategory;
}
public RuleStatus getRuleStatus() {
return ruleStatus;
}
public void setRuleStatus(RuleStatus ruleStatus) {
this.ruleStatus = ruleStatus;
}
public String getRuleChannelType() {
return ruleChannelType;
}
public void setRuleChannelType(String ruleChannelType) {
this.ruleChannelType = ruleChannelType;
}
public RuleAction getRuleAction() {
return ruleAction;
}
public void setRuleAction(RuleAction ruleAction) {
this.ruleAction = ruleAction;
}
public Boolean getCase() {
return isCase;
}
public void setCase(Boolean aCase) {
isCase = aCase;
}
}

Answer 1

它映射变量和getter方法。

Answer 2

将此getter方法从getCase()重命名为getIsCase()(遵循约定(。Jackson将其视为两个不同的字段，因为getter和字段名称不匹配。