The Jackson @JsonInclude注解可以在特定条件下用于排除类的属性或字段，并可以使用JsonInclude.Include枚举进行定义。 JsonInclude.Include枚举包含一些常量，如"ALWAYS"，"NON_DEFAULT"，"NON_EMPTY"和"NON_NULL"，用于确定是否排除属性（字段）。
public static enum JsonInclude.Include extends Enum<JSonInclude.Include>
import com.fasterxml.jackson.annotation.*;
import com.fasterxml.jackson.databind.*;
import java.io.*;
public class JsonIncludeTest {
public static void main(String args[]) throws IOException {
ObjectMapper objectMapper = new ObjectMapper();
Employee emp = new Employee();
String jsonString = objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(emp);
System.out.println(jsonString);
}
}
// Employee class
@JsonInclude(JsonInclude.Include.NON_EMPTY)
class Employee {
public int empId = 115;
public String empName = null;
@Override
public String toString() {
return "Employee{" +
"empId=" + empId +
", empName='" + empName + '\'' +
'}';
}
}{
"empId" : 115
}以上是在Java中，Jackson @JsonInclude注解的重要性是什么？的详细内容。更多信息请关注PHP中文网其他相关文章！
