– Start

点击此处观看本系列配套视频。

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默认情况下，字段的输出顺序和它们在类中的位置一致，我们也可以使用注解 @JsonPropertyOrder 自己指定顺序。

package shangbo.jackson.demo12; import java.util.Date; import org.apache.commons.lang3.builder.ToStringBuilder; import com.fasterxml.jackson.annotation.JsonPropertyOrder; @JsonPropertyOrder({"firstname", "lastname", "birthday"}) public class Person { private String firstname; private Date birthday; private String lastname; public String toString() { return ToStringBuilder.reflectionToString(this); } public String getFirstname() { return firstname; } public void setFirstname(String firstname) { this.firstname = firstname; } public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } public String getLastname() { return lastname; } public void setLastname(String lastname) { this.lastname = lastname; } } package shangbo.jackson.demo12; import java.util.Date; import com.fasterxml.jackson.databind.ObjectMapper; public class App { public static void main(String[] args) throws Exception { // 实例化 ObjectMapper 对象 ObjectMapper objectMapper = new ObjectMapper(); // 将对象转成 json String json = objectMapper.writeValueAsString(newPerson()); System.out.println(json); // 将 json 转成对象 Person shangbo = objectMapper.readValue(json, Person.class); System.out.println(shangbo); } private static Person newPerson() { Person shangbo = new Person(); shangbo.setFirstname("Bo"); shangbo.setBirthday(new Date()); shangbo.setLastname("Shang"); return shangbo; } }

– 更多参见：Jackson 精萃 – 声 明：转载请注明出处 – Last Updated on 2019-05-25 – Written by ShangBo on 2019-05-25 – End