How Can I Selectively Exclude Fields from JSON Serialization Without Affecting Deserialization?

Selective Application of @JsonIgnore: Addressing Serialization-only Exclusion

During data exchange with a server, a user object may contain sensitive information that should be hidden from clients during serialization. An approach often used is applying the @JsonIgnore annotation to conceal sensitive properties. However, this can also interfere with deserialization, creating challenges in specific scenarios.

Understanding the Issue

The @JsonIgnore annotation on a property prevents its inclusion in JSON serialization. However, if the same property is needed during deserialization (e.g., to create a user account), the exclusion becomes problematic.

Selective Exclusion with @JsonIgnore

To resolve this issue, two different approaches can be taken depending on the version of Jackson used:

Jackson versions prior to 1.9:

• Using @JsonIgnore on the Getter: Annotating only the getter method allows the property to be included during deserialization and excluded during serialization.

Jackson versions 1.9 and later:

• @JsonProperty with READ_ONLY: By adding the annotation arguments @JsonProperty(access = JsonProperty.Access.READ_ONLY) to the setter, you can specify that the property is only writable and excluded during serialization.

Example:

Consider a user object with a password field:

@JsonIgnore
private String password;

// Setter with READ_ONLY access (Jackson 1.9 and later)
@JsonProperty(access = JsonProperty.Access.READ_ONLY)
public void setPassword(String password) {
    this.password = password;
}

Note:

• Using READ_ONLY ensures that the password is only used for deserialization.
• Both approaches have been verified and function as intended.

The above is the detailed content of How Can I Selectively Exclude Fields from JSON Serialization Without Affecting Deserialization?. For more information, please follow other related articles on the PHP Chinese website!