I have the following JSON:
{
"2016-01-23": {
"downloads": 4,
"re_downloads": 1,
"updates": 0,
"returns": 0,
"net_downloads": 4,
"promos": 0,
"revenue": "0.00",
"returns_amount": "0.00",
"edu_downloads": 0,
"gifts": 0,
"gift_redemptions": 0,
"date": "2016-01-23"
},
"2016-01-24": {
"downloads": 1,
"re_downloads": 1,
"updates": 0,
"returns": 0,
"net_downloads": 1,
"promos": 0,
"revenue": "0.00",
"returns_amount": "0.00",
"edu_downloads": 0,
"gifts": 0,
"gift_redemptions": 0,
"date": "2016-01-24"
}
}
How can I parse this, when the date will change everytime? I must use Jackson to do the parsing.
When you have dynamic keys, you can use a Map<K, V>
. The type of the keys and the values depend on your needs.
The simplest approach is Map<String, Object>
. You'll need a TypeReference<T>
for that:
ObjectMapper mapper = new ObjectMapper();
Map<String, Object> map =
mapper.readValue(json, new TypeReference<Map<String, Object>>() {});
Assuming that your keys are valid dates, you could use a Map<LocalDate, Object>
.
The following dependency is required:
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-jsr310</artifactId>
<version>${jackson.version}</version>
</dependency>
Then you can have:
ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new JavaTimeModule());
Map<LocalDate, Object> map =
mapper.readValue(json, new TypeReference<Map<LocalDate, Object>>() {});
Finally, you could map the values of the dynamic keys to a Java class. Let's call it Foo
:
public class Foo {
private Integer downloads;
@JsonProperty("re_downloads")
private Integer reDownloads;
private Integer updates;
private Integer returns;
@JsonProperty("net_downloads")
private Integer netDownloads;
private Integer promos;
private String revenue;
@JsonProperty("returns_amount")
private String returnsAmount;
@JsonProperty("edu_downloads")
private Integer eduDownloads;
private Integer gifts;
@JsonProperty("gift_redemptions")
private Integer giftRedemptions;
// Default constructor, getters and setters omitted
}
And then you can have a Map<LocalDate, Foo>
:
ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new JavaTimeModule());
Map<LocalDate, Foo> map =
mapper.readValue(json, new TypeReference<Map<LocalDate, Foo>>() {});
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