[英]How to get a json response using jackson?
我是jackson的新手,我有一個示例json輸出,需要使用jackson來獲取此數據作為響應,我為此創建了pojo類,因為我知道可以通過json簡單實現這種問題,但是我是不知道要用傑克遜做這個。 請能有人提供一些幫助。
這是我的示例json數據-
{
"apmmetrics": [
{
"metric": "Somevalue",
"level": "somevalue",
"data": [
{
"host": "someValue",
"instance": "someValue",
"app": "someValue",
"series": [
{
"bucket": "201607210949",
"max": 300,
"min": 15,
"avg": 57.55,
"total": 1899,
"count": 33
},
{
"bucket": "201607210948",
"max": 437,
"min": 13,
"avg": 93.5,
"total": 13464,
"count": 144
},
{
"bucket": "201607210947",
"max": 431,
"min": 13,
"avg": 86.25,
"total": 28376,
"count": 329
}
]
}
]
}
]}
這些是我的pojo課程-
public class MetricsCollection {
private String metric;
private String level;
private List<MetricsGroup> data;
private transient Map<String, MetricsGroup> meta;
}
public class MetricsGroup {
private String host;
private String instance;
private String app;
private List<GenericMetrics> series;
private transient Map<String, GenericMetrics> metaMap;
}
public class BaseMetrics implements Serializable {
private static final long serialVersionUID = -3249688349785265214L;
protected double max = 0.0;
protected double min = 0.0;
protected double avg = 0.0;
protected double total = 0.0;
protected long count = 0;
}
public class GenericMetrics extends BaseMetrics {
private static final long serialVersionUID = -9057601499394607167L;
private String bucket;
private transient long rc = 0;
}
請讓我知道我該如何實現。 真的會很感激。 提前致謝。
您應該使用稱為apmmetrics
of MetricsCollection
的屬性數組創建另一個類(rootPojo)。 然后生成json: mapper.writeValueAsString(rootPojo);
編輯:
要不就:
final ObjectMapper mapper = new ObjectMapper();
final Map<String, List<MetricsCollection>> dataMap = ...
dataMap.put("apmmetrics", listOfMetricsCollection);
System.out.println(mapper.writeValueAsString(dataMap));
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