http://www.jsonschema2pojo.org/ - wklejasz swojego jsona. W source type zaznaczasz Json i klikasz preview. Wygenerowane zostaną zwykłe klasy Javove, które mogą posłużyć do transformacji do pojo.
Dobrze jest się też zabezpieczyć na wypadek pustej tablicy. Można w opcjach konfiguracyjnych Jacksona ustawić ACCEPT_SINGLE_VALUES_AS_ARRAY na true.
Kod:
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.annotation.Generated;
import com.fasterxml.jackson.annotation.JsonAnyGetter;
import com.fasterxml.jackson.annotation.JsonAnySetter;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;
@JsonInclude(JsonInclude.Include.NON_NULL)
public class Answer {
@JsonProperty("foobars")
private List<Foobar> foobars = new ArrayList<Foobar>();
private Map<String, Object> additionalProperties = new HashMap<String, Object>();
@JsonProperty("foobars")
public List<Foobar> getFoobars() {
return foobars;
}
@JsonProperty("foobars")
public void setFoobars(List<Foobar> foobars) {
this.foobars = foobars;
}
@JsonAnyGetter
public Map<String, Object> getAdditionalProperties() {
return this.additionalProperties;
}
@JsonAnySetter
public void setAdditionalProperties(String name, Object value) {
this.additionalProperties.put(name, value);
}
}
import java.util.HashMap;
import java.util.Map;
import javax.annotation.Generated;
import com.fasterxml.jackson.annotation.JsonAnyGetter;
import com.fasterxml.jackson.annotation.JsonAnySetter;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;
@JsonInclude(JsonInclude.Include.NON_NULL)
public class Foobar {
@JsonProperty("foo")
private Integer foo;
@JsonProperty("bar")
private Integer bar;
private Map<String, Object> additionalProperties = new HashMap<String, Object>();
@JsonProperty("foo")
public Integer getFoo() {
return foo;
}
@JsonProperty("foo")
public void setFoo(Integer foo) {
this.foo = foo;
}
@JsonProperty("bar")
public Integer getBar() {
return bar;
}
@JsonProperty("bar")
public void setBar(Integer bar) {
this.bar = bar;
}
@JsonAnyGetter
public Map<String, Object> getAdditionalProperties() {
return this.additionalProperties;
}
@JsonAnySetter
public void setAdditionalProperties(String name, Object value) {
this.additionalProperties.put(name, value);
}
}
ObjectMapper mapper = new ObjectMapper();
Answer answer = mapper.readValue(twojJson,Answer.class);
List<Foobar> list = answer.getFoobars();