如何使用json节点解析json数组值 [英] how to parse json array value using json node
问题描述
我有一个 JsonNode
,其中包含以下JSON。在 JsonNode
对象内部是一个数组。在该数组中有三个字段,其中一个是 slaid
,是一个列表。另外两个是字符串。这是JSON。
I have a JsonNode
which contains the following JSON. Inside that JsonNode
object is an array. In that array there are three fields, one of which, slaid
, is a list. The other two are strings. Here is the JSON.
{
"SLA": [
{
"slaid": [
"53637cc144ae8b607e089701"
],
"ragindicator": "Red",
"name": "r1"
},
{
"slaid": [
"53637d1844ae8b607e089704"
],
"ragindicator": "Amber",
"name": "a1"
},
{
"slaid": [
"53637eac44ae8b607e089706"
],
"ragindicator": "Green",
"name": "g1"
}
]
}
我想解析这个值。如何解析它, slaid
的类型是 List< String>
?我尝试了一些方法,但我仍然无法找到解决方案。
I want to parse this value. How can I parse it , where slaid
's type is List<String>
? I have tried some ways but I am still unable to find the solution.
推荐答案
我能看到的最简单方法是创建 POJO
适合您的 JSON
的类:
The easiest way I can see is creating POJO
classes which fit to your JSON
:
class Slaids {
@JsonProperty("SLA")
private List<Slaid> slaids;
public List<Slaid> getSlaids() {
return slaids;
}
public void setSlaids(List<Slaid> slaids) {
this.slaids = slaids;
}
@Override
public String toString() {
return slaids.toString();
}
}
class Slaid {
private List<String> slaid;
private String ragindicator;
private String name;
public List<String> getSlaid() {
return slaid;
}
public void setSlaid(List<String> slaid) {
this.slaid = slaid;
}
public String getRagindicator() {
return ragindicator;
}
public void setRagindicator(String ragindicator) {
this.ragindicator = ragindicator;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "Slaid [slaid=" + slaid + ", ragindicator=" + ragindicator + ", name=" + name + "]";
}
}
简单用法:
ObjectMapper mapper = new ObjectMapper();
System.out.println(mapper.readValue(json, Slaids.class));
以上程序打印:
[Slaid [slaid=[53637cc144ae8b607e089701], ragindicator=Red, name=r1], Slaid [slaid=[53637d1844ae8b607e089704], ragindicator=Amber, name=a1], Slaid [slaid=[53637eac44ae8b607e089706], ragindicator=Green, name=g1]]
如果你想使用 JsonNode
你可以这样做:
If you want to use JsonNode
you can do it in this way:
ObjectMapper mapper = new ObjectMapper();
JsonNode rootNode = mapper.readTree(json);
ArrayNode slaidsNode = (ArrayNode) rootNode.get("SLA");
Iterator<JsonNode> slaidsIterator = slaidsNode.elements();
while (slaidsIterator.hasNext()) {
JsonNode slaidNode = slaidsIterator.next();
System.out.println(slaidNode.get("slaid"));
System.out.println(slaidNode.get("ragindicator"));
System.out.println(slaidNode.get("name"));
}
以上程序打印:
["53637cc144ae8b607e089701"]
"Red"
"r1"
["53637d1844ae8b607e089704"]
"Amber"
"a1"
["53637eac44ae8b607e089706"]
"Green"
"g1"
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