
Jackson是一个用于Java的库,它具有非常强大的数据绑定能力,并提供了一个框架,可以将自定义的Java对象序列化为JSON,并将JSON反序列化回Java对象。Jackson库提供了@JsonInclude注解,它可以根据值在序列化期间控制整个类或其各个字段的序列化。
@JsonInclude注解包含以下两个值
import com.fasterxml.jackson.annotation.*;
import com.fasterxml.jackson.annotation.JsonInclude.Include;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.*;
public class IgnoreNullAndEmptyFieldTest {
public static void main(String[] args) throws JsonProcessingException {
ObjectMapper mapper = new ObjectMapper();
mapper.enable(SerializationFeature.INDENT_OUTPUT);
Employee employee = new Employee(115, null, ""); // passing null and empty fields
String result = mapper.writeValueAsString(employee);
System.out.println(result);
}
}
// Employee class
class Employee {
private int id;
@JsonInclude(Include.NON_NULL)
private String firstName;
@JsonInclude(Include.NON_EMPTY)<strong>
</strong> private String lastName;
public Employee(int id, String firstName, String lastName) {
super();
this.id = id;
this.firstName = firstName;
this.lastName = lastName;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
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;
}
}<strong>{
"id" : 115
}</strong>以上就是如何使用Java中的Jackson库忽略空和空字段?的详细内容,更多请关注php中文网其它相关文章!
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