[英]com.fasterxml.jackson.databind.JsonMappingException: Can not instantiate value of type [simple type, class car.Part]
I'm trying to deserialize this XML into a Parts
object: 我正在尝试将此XML反序列化为
Parts
对象:
<Parts>
<Part>
<Name>gearbox</Name>
<Year>1990</Year>
</Part>
<Part>
<Name>wheel</Name>
<Year>2000</Year>
</Part>
</Parts>
Car.java : Car.java :
package problem.car;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.dataformat.xml.XmlMapper;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.logging.Level;
import java.util.logging.Logger;
public class Car {
public static void main(String args[]) {
try {
String xml = "<Parts>\n"
+ " <Part>\n"
+ " <Name>gearbox</Name>\n"
+ " <Year>1990</Year>\n"
+ " </Part>\n"
+ " <Part>\n"
+ " <Name>wheel</Name>\n"
+ " <Year>2000</Year>\n"
+ " </Part>\n"
+ "</Parts>";
Parts parts = (Parts) deserialize(Parts.class, xml);
} catch (IOException ex) {
Logger.getLogger(Car.class.getName()).log(Level.SEVERE, null, ex);
}
}
public static final Object deserialize(final Class clazz, final String xml) throws IOException {
ObjectMapper xmlMapper = new XmlMapper();
xmlMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssz"));
Object object;
try {
object = xmlMapper.readValue(xml, clazz);
} catch (com.fasterxml.jackson.databind.exc.InvalidFormatException ex) {
xmlMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd"));
object = xmlMapper.readValue(xml, clazz);
}
return object;
}
}
Parts.java : Parts.java :
package problem.car;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;
import java.util.ArrayList;
import java.util.List;
@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonPropertyOrder({
"Part"
})
public class Parts {
@JsonProperty("Part")
private List<Part> Part = new ArrayList<>();
@JsonProperty("Part")
public List<Part> getPart() {
return Part;
}
@JsonProperty("Part")
public void setPart(List<Part> Part) {
this.Part = Part;
}
}
Part.java : Part.java :
package problem.car;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;
@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonPropertyOrder({
"Name",
"Year"
})
public class Part {
@JsonProperty("Name")
private String Name;
@JsonProperty("Year")
private String Year;
@JsonProperty("Name")
public String getName() {
return Name;
}
@JsonProperty("Name")
public void setName(String Name) {
this.Name = Name;
}
@JsonProperty("Year")
public String getYear() {
return Year;
}
@JsonProperty("Year")
public void setYear(String Year) {
this.Year = Year;
}
}
I don't see anything wrong with my code though so why does it keep giving me the following? 尽管我的代码没有发现任何问题,但是为什么它不断为我提供以下内容?
com.fasterxml.jackson.databind.JsonMappingException: Can not instantiate value of type [simple type, class problem.car.Part] from String value ('gearbox'); no single-String constructor/factory method
at [Source: java.io.StringReader@598067a5; line: 3, column: 28] (through reference chain: problem.car.Parts["Part"]->java.util.ArrayList[0])
You need to disable use of "wrapped" lists, to match the structure. 您需要禁用“包装”列表的使用,以匹配结构。 This should be explained on README page of xml dataformat github project page.
这应该在xml数据格式github项目页面的README页面上进行解释。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.