Question

首先请原谅我，因为我认为这是一个愚蠢的问题。我刚开始学习java

我有一个json文件，我将其解析为POJO，以便我可以对它们进行操作

这是解析器实现

public class ParsingTweet {

public static void main(String[] args) throws IOException {
    assert args != null & args.length > 0;
    List<Tweet> tweets = new ArrayList<>();
    ObjectMapper mapper = new ObjectMapper();
    try (BufferedReader reader = new BufferedReader(new FileReader(args[0]))) {
        String line;
        while ((line = reader.readLine()) != null) {
            tweets.add(mapper.readValue(line, Tweet.class));
        }
    }
    System.out.println(tweets);
 }
}

但我的导师说这个结果不是真正的POJO。它只是一个字符串表示。例如

[[text = I think this would be good. Would hopefully light the fire in the later rounds if you knew you were losing..., created_at = Mon Mar 06 22:48:07 +0000 2017, user = User@56f4468b, coordinates = null], [text = @Night_0f_Fire He's stuck in the alimony machine,, bust him out, created_at = Mon Mar 06 22:47:53 +0000 2017, user = User@6cc4c815, coordinates = null], ..., ..., ...]]]

那么实际的POJO是什么样的？

PS。这是json的例子

{＆＃34; text＆＃34;：＆＃34; Flood / Storm / Tree Down。北部海滩（King Rd，Ingleside，NSW 2101）于2017年3月6日21:38，＆＃34;用户＆＃34;：{＆＃34; id＆＃34;：＆＃34; 4721717942＆＃34;，＆＃34 ;姓名＆＃34;：＆＃34;新南威尔士州消防更新＆＃34;}，＆＃34; lang＆＃34;：＆＃34; en＆＃34;，＆＃34;坐标＆＃34;：{＆＃34;坐标＆＃34;：[151.264811，-33.6848]，＆＃34;输入＆＃34;：＆＃34;点＆＃34;}，＆＃34; created_at＆＃34;：＆＃34; Mon Mar 06 10:44 ：31 +0000 2017＆＃34;}，...，...

Answer 1

以Gson为例。

String fullFile = ...read file...;
Gson gson = new Gson();
List<Tweet> tweets = gson.fromJson(fullFile, new TypeToken<ArrayList<Tweet>>(){});
System.out.println(tweets);

来自JSON的POJO表示

1 个答案: