Java 如何使用json节点解析json数组值
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how to parse json array value using json node
提问by pushpendra chauhan
I have a JsonNodewhich contains the following JSON. Inside that JsonNodeobject 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.
我有一个JsonNode包含以下 JSON 的文件。该JsonNode对象内部是一个数组。在该数组中有三个字段，其中之一slaid是一个列表。另外两个是字符串。这是 JSON。
{
"SLA": [
{
"slaid": [
"53637cc144ae8b607e089701"
],
"ragindicator": "Red",
"name": "r1"
},
{
"slaid": [
"53637d1844ae8b607e089704"
],
"ragindicator": "Amber",
"name": "a1"
},
{
"slaid": [
"53637eac44ae8b607e089706"
],
"ragindicator": "Green",
"name": "g1"
}
]
}
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.
我想解析这个值。我如何解析它，slaid类型在List<String>哪里？我尝试了一些方法，但仍然无法找到解决方案。
回答by Micha? Ziober
The easiest way I can see is creating POJOclasses which fit to your JSON:
我能看到的最简单的方法是创建POJO适合您的类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 + "]";
}
}
Simple usage:
简单用法：
ObjectMapper mapper = new ObjectMapper();
System.out.println(mapper.readValue(json, Slaids.class));
Above program prints:
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]]
If you want to use JsonNodeyou can do it in this way:
如果你想使用JsonNode你可以这样做：
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"));
}
Above program prints:
以上程序打印：
["53637cc144ae8b607e089701"]
"Red"
"r1"
["53637d1844ae8b607e089704"]
"Amber"
"a1"
["53637eac44ae8b607e089706"]
"Green"
"g1"
