2017.07.07 报错信息
com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "conditionQuantity" (class objectMapper.NewInteger), not marked as ignorable (7 known properties: "reduceFee", "perReduceFee", "priority", "match", "reduceDiscount", "conditionFee", "per"])
at [Source: [{"conditionQuantity":30,"reduceDiscount":90.5,"priority":1}];
line: 1, column: 25] (through reference chain: java.util.ArrayList[0]->objectMapper.NewInteger["conditionQuantity"])一直显示的错误是没有匹配的conditionQuantity字段
Class源码
public class NewInteger implements Serializable{private static final long serialVersionUID = 4878434867152140447L;
private Long conditionFee;
private Long per;
private Long perReduceFee;
private Integer conditionQuantity;
private Long reduceFee;
private Integer reduceDiscount;
private Integer priority;
private Boolean isMatch;
}
很明显class类中是有conditionQuantity字段的，于是思考过去成功的案例。
【ObjectMapper的坑】发现唯一失败的可能就是没有设置setter和getter方法。
于是修改class类的代码。
修改后Class
public class NewInteger implements Serializable{private static final long serialVersionUID = 4878434867152140447L;
private Long conditionFee;
private Long per;
private Long perReduceFee;
private Integer conditionQuantity;
private Long reduceFee;
private Integer reduceDiscount;
private Integer priority;
private Boolean isMatch;
public Long getConditionFee() {
return conditionFee;
}public void setConditionFee(Long conditionFee) {
this.conditionFee = conditionFee;
}public Long getPer() {
return per;
}public void setPer(Long per) {
this.per = per;
}public Long getPerReduceFee() {
return perReduceFee;
}public void setPerReduceFee(Long perReduceFee) {
this.perReduceFee = perReduceFee;
}public Integer getConditionQuantity() {
return conditionQuantity;
}public void setConditionQuantity(Integer conditionQuantity) {
this.conditionQuantity = conditionQuantity;
}public Long getReduceFee() {
return reduceFee;
}public void setReduceFee(Long reduceFee) {
this.reduceFee = reduceFee;
}public Integer getReduceDiscount() {
return reduceDiscount;
}public void setReduceDiscount(Integer reduceDiscount) {
this.reduceDiscount = reduceDiscount;
}public Integer getPriority() {
return priority;
}public void setPriority(Integer priority) {
this.priority = priority;
}public Boolean getMatch() {
return isMatch;
}public void setMatch(Boolean match) {
isMatch = match;
}
}
ObjectMapper解析代码
public class ObejctMapperTest {public List parse() throws IOException {ObjectMapper objectMapper = new ObjectMapper();
String json = "[{\"conditionQuantity\":30,\"reduceDiscount\":90.5,\"priority\":1}]";
return objectMapper.readValue(json, new TypeReference>(){});
}public static void main(String[] args) {
ObejctMapperTest run = new ObejctMapperTest();
try {
System.out.println("before parse");
List result = run.parse();
System.out.println(result.get(0).getReduceDiscount());
} catch (IOException e) {
System.out.println("catch parse error");
System.out.println(e.toString());
}
}
} [解析结果]
文章图片
解析结果 从结果来看，很明显踩到另一个坑了。
在拿Integer类型的字段reduceDiscount时，相对的实际参数是90.5，这种情况下，objectMapper并不会报错，而是直接精度丢失了。
推荐阅读
- ObjectMapper如果某些字段无法转换为对象的默认值
- Spring boot应用失败，Jackson2ObjectMapperBuilder。可见性不存在
- Jackson ObjectMapper给出了递归数据类型的错误
- 配置Java AWS Lambda使用的Objectmapper
- 如何通过自动装配注入具有不同配置的不同ObjectMappers（）
- 是否可以让Jackson ObjectMapper在Spring Boot应用程序中遵守JAXB XML注释（）
- 来自MongoDB BSON的Jackson ObjectMapper
- 如何使quickxml ObjectMapper与codehaus注释一起使用
- RxSwift + Moya + ObjectMapper