Json 注解（待补充）

1.@JsonIgnoreProperties
在类上注解哪些属性不用参与序列化和反序列化

@Data
@JsonIgnoreProperties(value = { "word" })  
public class Person { 
  private String hello;
  private String word;
}

2.@JsonIgnore
属性上忽略

@Data
public class Person { 
  private String hello;
  @JsonIgnore
  private String word;
}

3.@JsonFormat
格式化序列化后的字符串

@Data
public class Person{
  @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd HH:mm",timezone = "GMT+8")
  private Date time;
  private String hello;
  private String word;
}

4.@JsonSerialize
序列化的时候通过重写的方法，可以加在get方法上，也可以直接加在属性上

@Data
public class Person { 
  private String hello;
  private String word;
  @JsonSerialize(using = CustomDoubleSerialize.class)
  private Double money;
}

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

5.@JsonDeserialize
反序列化的时候通过重写的方法，可以加在set方法上，也可以直接加在属性上

@Data
public class Person { 
  private String hello;
  private String word; 
  @JsonDeserialize(using = CustomDateDeserialize.class)
  private Date time;
}

public class CustomDateDeserialize extends JsonDeserializer {  
  
    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;  
    }  
} 

5.@JsonInclude
Include.Include.ALWAYS 默认
Include.NON_DEFAULT 属性为默认值不序列化
Include.NON_EMPTY 属性为 空（“”） 或者为 NULL 都不序列化
Include.NON_NULL 属性为NULL 不序列化

@Data
public class OrderProcessTime { 
    @JsonInclude(JsonInclude.Include.ALWAYS)
    private Date plan;
}

6.@JsonProperty
用于表示Json序列化和反序列化时用到的名字，例如一些不符合编程规范的变量命名

@Data
public class Person { 
  private String hello;
  private String word; 
  private Date time;
  @JsonProperty(value = "DeliveryTime")
  private Integer deliveryTime;
}