您需要使用JsonPath库，该库仅允许您选择必填字段，然后可以Jackson将原始数据转换为POJO类。解决方案示例如下所示：
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.type.CollectionType;
import com.jayway.jsonpath.JsonPath;
import java.io.File;
import java.util.List;
import java.util.Map;
public class JsonPathApp {
public static void main(String[] args) throws Exception {
File jsonFile = new File("./resource/test.json").getAbsoluteFile();
List<Map> nodes = JsonPath.parse(jsonFile).read("$..value[*].user.name");
ObjectMapper mapper = new ObjectMapper();
CollectionType usersType = mapper.getTypeFactory().constructCollectionType(List.class, User.class);
List<User> users = mapper.convertValue(nodes, usersType);
System.out.println(users);
}
}
class User {
@JsonProperty("first")
private String firstName;
@JsonProperty("last")
private String lastName;
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
@Override
public String toString() {
return "User{" +
"firstName='" + firstName + '\'' +
", lastName='" + lastName + '\'' +
'}';
}
}
上面的代码打印：
[User{firstName='x', lastName='y'}]
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