SpringBoot 序列化器注解使用方法

Json解析工具Jackson

• @JsonIgnoreProperties

  此注解是类注解，作用是json序列化时将Java bean中的一些属性忽略掉，序列化和反序列化都受影响。

• @JsonIgnore

  此注解用于属性或者方法上（最好是属性上），作用和上面的@JsonIgnoreProperties一样。

• @JsonFormat

  此注解用于属性或者方法上（最好是属性上），可以方便的把Date类型直接转化为我们想要的模式，比如@JsonFormat(pattern = “yyyy-MM-dd HH-mm-ss”)

• @JsonSerialize

  此注解用于属性或者getter方法上，用于在序列化时嵌入我们自定义的代码，比如序列化一个double时在其后面限制两位小数点。

public class CustomDoubleSerialize extends JsonSerializer<Double> {      private DecimalFormat df = new DecimalFormat("##.00");      @Override      public void serialize(Double value, JsonGenerator jgen,              SerializerProvider provider) throws IOException,              JsonProcessingException {          jgen.writeString(df.format(value));      }  }  

• @JsonDeserialize

  此注解用于属性或者setter方法上，用于在反序列化时可以嵌入我们自定义的代码，类似于上面的@JsonSerialize

public class CustomDateDeserialize extends JsonDeserializer<Date> {      private SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");      @Override      public Date deserialize(JsonParser jp, DeserializationContext ctxt)              throws IOException, JsonProcessingException {          Date date = null;          try {              date = sdf.parse(jp.getText());          } catch (ParseException e) {              e.printStackTrace();          }          return date;      }  }  

完整例子:

“`
//表示序列化时忽略的属性
@JsonIgnoreProperties(value = { “word” })
public class Person {
private String name;
private int age;
private boolean sex;
private Date birthday;
private String word;
private double salary;

public String getName() {      return name;  }  public void setName(String name) {      this.name = name;  }  public int getAge() {      return age;  }  public void setAge(int age) {      this.age = age;  }  public boolean isSex() {      return sex;  }  public void setSex(boolean sex) {      this.sex = sex;  }  public Date getBirthday() {      return birthday;  }  // 反序列化一个固定格式的Date  @JsonDeserialize(using = CustomDateDeserialize.class)  public void setBirthday(Date birthday) {      this.birthday = birthday;  }  public String getWord() {      return word;  }  public void setWord(String word) {      this.word = word;  }  // 序列化指定格式的double格式  @JsonSerialize(using = CustomDoubleSerialize.class)  public double getSalary() {      return salary;  }  public void setSalary(double salary) {      this.salary = salary;  }  public Person(String name, int age) {      this.name = name;      this.age = age;  }  public Person(String name, int age, boolean sex, Date birthday,          String word, double salary) {      super();      this.name = name;      this.age = age;      this.sex = sex;      this.birthday = birthday;      this.word = word;      this.salary = salary;  }  public Person() {  }  @Override  public String toString() {      return "Person [name=" + name + ", age=" + age + ", sex=" + sex              + ", birthday=" + birthday + ", word=" + word + ", salary="              + salary + "]";  }  

}
“`