如何在 Java 中将 Arraylist 转换为 Json
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How to convert Arraylist to Json in Java
提问by typeof programmer
I have an arraylist, the arraylist holds a bunch of Domain object. It's like below showed:
我有一个数组列表，数组列表包含一堆域对象。就像下图所示：
Domain [domainId=19, name=a, dnsName=a.com, type=0, flags=0]
Domain [domainId=20, name=b, dnsName=b.com, type=0, flags=12]
Domain [domainId=21, name=c, dnsName=c.com, type=0, flags=0]
Domain [domainId=22, name=d, dnsName=d.com, type=0, flags=0]
My question is how to convert the ArrayListto JSON? The data format should be:
我的问题是如何将 转换ArrayList为 JSON？数据格式应为：
{
"param":{
"domain":[
{
"domid":19,
"name":"a",
"dnsname":"a.com",
"type":0,
"flags":
},
...
]
}
采纳答案by nem035
Not sure if it's exactly what you need, but you can use the GSONlibrary (Link) for ArrayListto JSONconversion.
不知道这是你需要什么，但你可以使用GSON库（链接）用于ArrayList向JSON转换。
ArrayList<String> list = new ArrayList<String>();
list.add("str1");
list.add("str2");
list.add("str3");
String json = new Gson().toJson(list);
Or in your case:
或者在你的情况下：
ArrayList<Domain> list = new ArrayList<Domain>();
list.add(new Domain());
list.add(new Domain());
list.add(new Domain());
String json = new Gson().toJson(list);
If for some reason you find it more convenient, you can also iterate through the ArrayListand build a JSONfrom individual Domainobjects in the list
如果由于某种原因你觉得它更方便，你也可以遍历列表中的单个对象ArrayList并构建一个JSONDomain
String toJSON(ArrayList<Domain> list) {
Gson gson = new Gson();
StringBuilder sb = new StringBuilder();
for(Domain d : list) {
sb.append(gson.toJson(d));
}
return sb.toString();
}
