我必须使用Jackson库将json反序列化为Customer类
{
"code":"C001",
"city": "Pune",
"street": "ABC Road"
}
和类作为
class Address{
String city;
String street;
}
class Customer{
String code;
Address address;
}
我在堆栈上发现了类似的问题 Java jackson嵌入式对象反序列化
但答案不适用于我的情况。另外我只想使用杰克逊图书馆。
如何将此json映射到Customer对象？
你可以放一个 @JsonUnwrapped 注释 Address 客户类中的字段。这是一个例子：
public class JacksonValue {
final static String JSON = "{\n"
+" \"code\":\"C001\",\n"
+" \"city\": \"Pune\",\n"
+" \"street\": \"ABC Road\"\n"
+"}";
static class Address {
public String city;
public String street;
@Override
public String toString() {
return "Address{" +
"city='" + city + '\'' +
", street='" + street + '\'' +
'}';
}
}
static class Customer {
public String code;
@JsonUnwrapped
public Address address;
@Override
public String toString() {
return "Customer{" +
"code='" + code + '\'' +
", address=" + address +
'}';
}
}
public static void main(String[] args) throws IOException {
final ObjectMapper mapper = new ObjectMapper();
System.out.println(mapper.readValue(JSON, Customer.class));
}
}
输出：
Customer{code='C001', address=Address{city='Pune', street='ABC Road'}}
您需要的是自定义反序列化器。 Jackson How-To：定制反序列化器
对于您的用例，它可能是这样的：
class CustomerDeserializer extends JsonDeserializer<Customer>
{
public Customer deserialize(JsonParser p, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
JsonNode node = p.getCodec().readTree(p);
String code = node.get("code").asText();
String city = node.get("city").asText();
String street = node.get("street").asText();
Address adr = new Address(city, street);
return new Customer(code, adr);
}
}
您的客户JSON对象应如下所示：
{
"code":"C001",
"address":{
"city": "Pune",
"street": "ABC Road"
}
}
如果没有一些额外的转换，这个json结构就不能映射到两个类。写一个班级 CustomerAddress 这将包含来自json的所有三个字段然后创建 Address getAddress() 和 Customer getCustomer() 在其中或转换json以将地址信息嵌套在客户字段内，如@eztam所建议的那样。
public CustomerAddress {
private String code;
private String city;
private String street;
public Address getAddress() {
return new Address(city, street);
}
public Address getCustomer() {
return new Customer(code, this.getAddress());
}
}
尝试这个 ！！！
{
"code":"customer1",
"address":{
"type":"nested",
"properties":{
"city":"Hyderabad",
"street":"1000ftRoad"
}
}
}