我正在尝试使用带有以下JSON的fastxml构建Java对象
JSON : {"name":"Location Test",
"location":{
"coordinates":[10.1234657,10.123467]
},
...
}
我收到此异常：
play.api.Application$$anon$1: Execution exception[[RuntimeException: com.fasterxml.jackson.databind.JsonMappingException:
Can not deserialize instance of double[] out of START_OBJECT token
at [Source: N/A; line: -1, column: -1] (through reference chain: com.mypackages.models.Place["location"])]]
地方课程：
public class Place{
private String name;
private Location location;
...
getters and setters
}
位置类别：
public class Location{
private double[] coordinates;
public Location(double[] coordinates) {
this.coordinates = coordinates;
}
...
//getter and setter for coordinate field
}
有人可以告诉我是什么原因引起的吗？
您需要从位置对象中删除构造函数。我已经按照您提供的信息创建了示例程序，它已成功运行。
位置类别：
public class Location{
private double[] coordinates;
/**
* @return the coordinates
*/
public double[] getCoordinates() {
return coordinates;
}
/**
* @param coordinates the coordinates to set
*/
public void setCoordinates(double[] coordinates) {
this.coordinates = coordinates;
}
}
地方课程：
public class Place{
private String name;
private Location location;
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @return the location
*/
public Location getLocation() {
return location;
}
/**
* @param location the location to set
*/
public void setLocation(Location location) {
this.location = location;
}
@Override
public String toString() {
return "Place: " + name + " Location: " + Arrays.toString(location.getCoordinates());
}
}
APP类：公共类App {公共静态void main（String [] args）引发IOException {
//read json file data to String
byte[] jsonData = Files.readAllBytes(Paths.get("places.txt"));
//create ObjectMapper instance
ObjectMapper objectMapper = new ObjectMapper();
Place place = objectMapper.readValue(jsonData, Place.class);
System.out.println("Place Object\n"+ place);
}
}
Places.txt-包含JSON
{
"name":"Location Test",
"location":{
"coordinates":[10.1234657,10.123467]
}
}
您需要在maven项目中包括以下依赖项：
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.6.1</version>
</dependency>
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