默認(rèn)情況下，字段的輸出順序和它們?cè)陬愔械奈恢靡恢?#xff0c;我們也可以使用注解 @JsonPropertyOrder 自己指定順序。

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 {// 實(shí)例化 ObjectMapper 對(duì)象ObjectMapper objectMapper = new ObjectMapper();// 將對(duì)象轉(zhuǎn)成 jsonString json = objectMapper.writeValueAsString(newPerson());System.out.println(json);// 將 json 轉(zhuǎn)成對(duì)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;} }

原文鏈接：https://blog.csdn.net/shangboerds/article/details/90548966

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