默認情況下，空字段也會被輸出，我們可以使用 @JsonInclude 不輸出空字段。

package shangbo.jackson.demo10;import org.apache.commons.lang3.builder.ToStringBuilder;import com.fasterxml.jackson.annotation.JsonInclude;@JsonInclude(JsonInclude.Include.NON_EMPTY) public class Person {private String firstname;private String lastname;public String toString() {return ToStringBuilder.reflectionToString(this);}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;} } package shangbo.jackson.demo10;import com.fasterxml.jackson.databind.ObjectMapper;public class App {public static void main(String[] args) throws Exception {// 實例化 ObjectMapper 對象ObjectMapper objectMapper = new ObjectMapper();// 將對象轉成 jsonString json = objectMapper.writeValueAsString(newPerson());System.out.println(json);}private static Person newPerson() {Person shangbo = new Person();shangbo.setFirstname("Bo"); // shangbo.setLastname("Shang");return shangbo;} }

原文鏈接：https://blog.csdn.net/shangboerds/article/details/90548743

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