Java 中 Jackson @JsonInclude 注释的重要性?
Jackson @JsonInclude 注释可用于在特定条件下排除类的属性或字段，并且可以使用 JsonInclude.Include枚举进行定义。JsonInclude.Include枚举包含一些常量，如"ALWAYS ...
public static enum JsonInclude.Include extends Enum<JSonInclude.Include>
示例
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 + '\'' +
'}';
}
}
输出
{
"empId" : 115
}
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