在 Java 中使用 GSON 解析复杂的 Json 对象 [英] Parsing a complex Json Object using GSON in Java
问题描述
我有一个很长的 JSON 需要用 Gson 解析,但为了简洁起见,我将其修剪为以下示例:
I have a very long JSON to parse with Gson, but for brevity I have trimmed it to this example:
{
"volumes": [
{
"status": "available",
"managed": true,
"name": "va_85621143-1133-412f-83b4-57a01a552638_",
"support": {
"status": "supported"
},
"storage_pool": "pfm9253_pfm9254_new",
"id": "afb8e294-6188-4907-9f6f-963c7623cecb",
"size": 9
},
{
"status": "in-use",
"managed": false,
"name": "bt_newd20",
"support": {
"status": "not_supported",
"reasons": [
"This volume is not a candidate for management because it is already attached to a virtual machine. To manage this volume with PowerVC, select the virtual machine to which the volume is attached for management. The attached volume will be automatically included for management."
]
},
"storage_pool": "KVM",
"mapped_wwpns": [
"2101001B32BD4280",
"2100001B329D4280",
"2101001B32BD637E",
"2100001B329D637E"
],
"id": "c7838c79-17ca-3cbc-98e5-3567fde902d8",
"size": 0
},
{
"status": "available",
"managed": true,
"name": "vdisk138",
"support": {
"status": "supported"
},
"storage_pool": "Chassis2_IBMi",
"id": "b6d00783-9f8c-40b8-ad78-956b0299478c",
"size": 100
}
]
}
从SO和其他几个地方,我发现我需要定义一个像下面这样的顶级容器,但我不知道如何完成它的定义
From SO and few other places, I have found that I need to define a top level container like one below but I do not know how to complete its definition
static class VolumeContainer {
//I don't know what do in here. This is the first problem
}
然后是每个Volume
static class Volume {
private String status;
private boolean managed;
private String name;
//This is the second problem.The "support" variable should not be a string.
//It is in {}. Just for information, I won't use it.
//private String support;
private String storagePool;
private List<String> mapped_wwpns;
private String id;
private String size;
}
我正在尝试解析它,这是我目前编码的内容:
I am trying to parse it and this is what I coded so far:
JsonParser parser = new JsonParser();
JsonObject obj = parser.parse(response).getAsJsonObject();
Gson gson = new Gson();
JSON 字符串存储在名为 response 的变量中
The JSON string is stored in a variable named response
VolumeContainer vc = gson.fromJson(response,VolumeContainer.class);
我的最终要求是 id
和关联的 name
的 HashTable
.
My final requirement is a HashTable
of id
and associated name
.
推荐答案
第一个问题:你的VolumeContainer
需要是:
public class VolumeContainer {
public List<Volume> volumes;
}
它不需要是静态的.
第二个问题:你的Volume
类应该是这样的:
Second problem: your Volume
class should be like this:
public class Volume {
private String status;
private Boolean managed;
private String name;
private Support support;
private String storage_pool;
private String id;
private int size;
private List<String> mapped_wwpns;
public String getId(){return id;}
public String getName(){return name;}
}
我像这样定义了一个名为 Support
的类:
I defined a class named Support
like this:
public class Support {
private String status;
private List<String> reasons;
}
第三个问题:解析,如果response
字符串包含你的示例数据,简单的解析如下:
Third problem: parsing, If response
string contains your example data, simply parse like this:
Gson g = new Gson();
VolumeContainer vc = g.fromJson(response, VolumeContainer.class);
第四个问题:获取地图.最后得到你的 HashMap
,就像这样:
Fourth problem: get the map. Finally to get your HashMap
, just do like this:
HashMap<String, String> hm = new HashMap<String,String>();
for(Volume v: vc.volumes){
hm.put(v.getId(), v.getName());
}
这篇关于在 Java 中使用 GSON 解析复杂的 Json 对象的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!