如何在Java中将Arraylist转换为Json [英] How to convert Arraylist to Json in Java
本文介绍了如何在Java中将Arraylist转换为Json的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个arraylist,这个arraylist容纳了一堆Domain对象.如下图所示:
I have an arraylist, the arraylist holds a bunch of Domain object. It's like below showed:
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]
我的问题是如何将ArrayList
转换为JSON?数据格式应为:
My question is how to convert the ArrayList
to JSON? The data format should be:
{
"param":{
"domain":[
{
"domid":19,
"name":"a",
"dnsname":"a.com",
"type":0,
"flags":
},
...
]
}
推荐答案
Not sure if it's exactly what you need, but you can use the GSON library (Link) for ArrayList
to JSON
conversion.
ArrayList<String> list = new ArrayList<String>();
list.add("str1");
list.add("str2");
list.add("str3");
String json = new Gson().toJson(list);
或者您的情况:
ArrayList<Domain> list = new ArrayList<Domain>();
list.add(new Domain());
list.add(new Domain());
list.add(new Domain());
String json = new Gson().toJson(list);
如果出于某种原因发现它更方便,则还可以遍历ArrayList
并从列表中的各个Domain
对象构建JSON
If for some reason you find it more convenient, you can also iterate through the ArrayList
and build a JSON
from individual Domain
objects in the list
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();
}
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