Jackson provides an effective an efficient way to bind json to POJOs. However, at times, certain properties may need to be ignored while converting a json to java ojbect and a java object to json string. Jackson provides three ways to filter properties.
The example below shows method 1 and 2. Also note the use of the @JsonAutoDetect annotation.
package com.studytrails.json.jackson;
import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.JsonAutoDetect.Visibility;
import com.fasterxml.jackson.annotation.JsonProperty;
// Do not use fields to autodetect. use the public getter methods to autodetect properties
@JsonAutoDetect(fieldVisibility = Visibility.NONE, getterVisibility = Visibility.PUBLIC_ONLY)
public class AlbumsFilter {
private String title;
private DatasetFilter[] datasetFilter;
public String total_pages;
protected String getTotal_pages() {
return total_pages;
}
public String getTitle() {
return title;
}
// this getter method is for the 'dataset' property
@JsonProperty("dataset")
public DatasetFilter[] getDatasetFilter() {
return datasetFilter;
}
}
package com.studytrails.json.jackson;
import java.util.HashMap;
import java.util.Map;
import com.fasterxml.jackson.annotation.JsonAnyGetter;
import com.fasterxml.jackson.annotation.JsonAnySetter;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonProperty;
// ignore the property with name 'tags'.
@JsonIgnoreProperties({ "tags" })
public class DatasetFilter {
private String album_id;
private String album_title;
private Map<String , Object> otherProperties = new HashMap<String , Object>();
private String album_comments;
@JsonCreator
public DatasetFilter(@JsonProperty("album_id") String album_id, @JsonProperty("album_title") String album_title) {
this.album_id = album_id;
this.album_title = album_title;
}
// ignore the property specified by this getter.
@JsonIgnore
public String getAlbum_comments() {
return album_comments;
}
public String getAlbum_id() {
return album_id;
}
public void setAlbum_id(String album_id) {
this.album_id = album_id;
}
public String getAlbum_title() {
return album_title;
}
public void setAlbum_title(String album_title) {
this.album_title = album_title;
}
public Object get(String name) {
return otherProperties.get(name);
}
// this method is used to get all properties not specified earlier.
@JsonAnyGetter
public Map<String , Object> any() {
return otherProperties;
}
@JsonAnySetter
public void set(String name, Object value) {
otherProperties.put(name, value);
}
}
(Note: This article’s original links is here )