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
Example
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 + ''' +
'}';
}
}
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输出
{
"empId" : 115
}
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