Java 如何使用json节点解析json数组值
我有一个Java 如何使用json节点解析json数组值,java,json,jackson,Java,Json,Jackson,我有一个JsonNode,其中包含以下JSON。在JsonNode对象中是一个数组。在该数组中有三个字段,其中一个是列表,slaid。另外两个是字符串。这里是JSON { "SLA": [ { "slaid": [ "53637cc144ae8b607e089701" ], "ragindicator": "Red", "name": "r1"
JsonNode
,其中包含以下JSON。在JsonNode
对象中是一个数组。在该数组中有三个字段,其中一个是列表,slaid
。另外两个是字符串。这里是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。如果
slaid
的类型是List
,如何解析它?我尝试了一些方法,但仍然找不到解决方案。我能看到的最简单的方法是创建适合您的JSON
的POJO
类:
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 + "]";
}
}
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]]
["53637cc144ae8b607e089701"]
"Red"
"r1"
["53637d1844ae8b607e089704"]
"Amber"
"a1"
["53637eac44ae8b607e089706"]
"Green"
"g1"
如果要使用JsonNode
,可以采用以下方式:
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"));
}
展示你尝试过的方法。你说的“解析这个值”是什么意思?你想用什么值做什么?我使用的是迭代器,jsonNode.iterator(),但得到的是一个空迭代器
["53637cc144ae8b607e089701"]
"Red"
"r1"
["53637d1844ae8b607e089704"]
"Amber"
"a1"
["53637eac44ae8b607e089706"]
"Green"
"g1"