justSaid justSaid - 6 months ago 18
JSON Question

Order of the JSON objects, using jacksons ObjectMapper

I'm using ObjectMapper to do my java-json mapping.

ObjectWriter ow = new ObjectMapper().writer().withDefaultPrettyPrinter();
ow.writeValue(new File( fileName +".json"), jsonObj);


this is my java class:

public class Relation {

private String id;
private String source;
private String target;
private String label;
private List<RelAttribute> attributes;

public String getId() {
return id;
}

public void setId(String id) {
this.id = id;
}

public String getSource() {
return source;
}

public void setSource(String source) {
this.source = source;
}

public String getTarget() {
return target;
}

public void setTarget(String target) {
this.target = target;
}

public String getLabel() {
return label;
}
public void setLabel(String label) {
this.label = label;
}

public void setAttributes(List<RelAttribute> attributes) {
this.attributes = attributes;
}

public List<RelAttribute> getAttributes() {
return attributes;
}

}


this is what I get:

{
"id" : "-75da69d3-79c8-4000-a3d8-b10350a57a7e",
"attributes" : [ {
"attrName" : "ID",
"attrValue" : ""
}, {
"attrName" : "Description",
"attrValue" : "Primary Actor"
}, {
"attrName" : "Status",
"attrValue" : ""
} ],
"label" : "new Label",
"target" : "-46b238ac-b8b3-4230-b32c-be9707f8b691",
"source" : "-daa34638-061a-45e0-9f2e-35afd6c271e0"
}


So my question now is, how can I get this json output:

{
"id" : "-75da69d3-79c8-4000-a3d8-b10350a57a7e",
"label" : "new Label",
"target" : "-46b238ac-b8b3-4230-b32c-be9707f8b691",
"source" : "-daa34638-061a-45e0-9f2e-35afd6c271e0",
"attributes" : [ {
"attrName" : "ID",
"attrValue" : ""
}, {
"attrName" : "Description",
"attrValue" : "Primary Actor"
}, {
"attrName" : "Status",
"attrValue" : ""
} ]

}


I want it with same order as in my java declaration. Is there a way to specify it ? Maybe with annotations or stuff like that ?

Answer
@JsonPropertyOrder({ "id", "label", "target", "source", "attributes" })
public class Relation { ... }