杰克逊 - Json到多个参赛作品的POJO [英] Jackson - Json to POJO With Multiple Entries
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问题描述
我知道如果文件User.json有
I know If the file User.json has
{
"name" : { "first" : "Joe", "last" : "Sixpack" },
"gender" : "MALE",
"verified" : false,
"userImage" : "Rm9vYmFyIQ=="
}
我可以像这样构建一个User对象:
I can construct a single User object like this :
User user = mapper.readValue(new File("user.json"), User.class);
但是如果文件User.json具有以下内容,我该如何构建对象列表:
But how do I construct a list of objects if the file User.json has :
{
"name" : { "first" : "Joe", "last" : "Sixpack" },
"gender" : "MALE",
"verified" : false,
"userImage" : "Rm9vYmFyIQ=="
},
{
"name" : { "first" : "Jane", "last" : "Austen" },
"gender" : "FEMALE",
"verified" : false,
"userImage" : "DFREWEWE=="
}
?
推荐答案
多种方式:如果你有这些JSON数组,你可以这样做:
Multiple ways: if you have a JSON array of these, you can do:
User[] users = mapper.readValue(json, User[].class);
或者,如果它只是一系列根级别值,您可以这样做:
or, if it is just a sequence of root level values you can do:
Iterator<User> it = mapper.readValues(json, User.class);
并迭代值(添加到List等)
and iterate over values (add to a List or such)
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