在 Java 中存储 JSON 数据
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Store JSON data in Java
提问by Francesco Menzani
I want to learn JSON data storage in Java using Eclipse, so I googled a lot.
我想使用 Eclipse 学习 Java 中的 JSON 数据存储，所以我搜索了很多。
I found JSON.simpleand GSON. Are those a good choice?
我找到了JSON.simple和GSON。这些是不错的选择吗？
I went to Properties >> Java Build Path >> Add External JARs. I added json-simple-1.1.1.jarand google-gson-2.2.4-release.zip. Is it right? Where is the JavaDoc located?
我去了Properties >> Java Build Path >> Add External JARs。我添加了json-simple-1.1.1.jar和google-gson-2.2.4-release.zip。这样对吗？JavaDoc 位于何处？
Main problem concerns an example found here: JSON.simple example – Read and write JSON, which teaches about JSON.simple. I wrote the following code:
主要问题与此处找到的示例有关：JSON.simple example – Read and write JSON，它教授 JSON.simple 。我写了以下代码：
JSONObject object = new JSONObject();
JSONArray array = new JSONArray();
array.add("Joiner");
array.add("System");
object.put("nicknames", array);
object.put("from", "Italy");
object.put("age", 15);
try {
String path = "";
FileWriter file = new FileWriter(path);
String json = object.toJSONString();
file.write(json);
file.close();
} catch (IOException io) {
// Fail
}
But I get the following warnings. What do these mean?
但我收到以下警告。这些是什么意思？
Type safety: The method add(Object) belongs to the raw type ArrayList. References to generic type ArrayList should be parameterized on 'JSONArray.add'
Type safety: The method put(Object, Object) belongs to the raw type HashMap. References to generic type HashMap should be parameterized on 'JSONObject.put'
类型安全：方法 add(Object) 属于原始类型 ArrayList。对泛型类型 ArrayList 的引用应该在“JSONArray.add”上参数化
类型安全： put(Object, Object) 方法属于原始类型 HashMap。对泛型类型 HashMap 的引用应该在 'JSONObject.put' 上参数化
On a side note, how can I prettify my JSON?
附带说明一下，我如何美化我的 JSON？
采纳答案by Francesco Menzani
I found JSON.simpleand GSON. Are those a good choice?
我找到了JSON.simple和GSON。这些是不错的选择吗？
At the moment, I like the former very much, but the latter has more features, is more widely used, and is always up-to-date.
目前，我非常喜欢前者，但后者功能更多，使用范围更广，而且总是与时俱进。
Where is the JavaDoc located?
JavaDoc 位于何处？
For JSON.simple, see this answeron the site. For GSON, follow this link.
对于 JSON.simple，请参阅网站上的此答案。对于 GSON，请点击此链接。
I get some warnings. What do they mean?
我收到一些警告。他们的意思是什么？
Those classes are declared without type parameters for their superclass:
这些类的超类声明没有类型参数：
public class JSONObject extends HashMap {
// ...
}
public class JSONArray extends ArrayList {
// ...
}
When you call put()or add(), they are defined in the superclass, which is not parameterized properly.
当您调用put()or 时add()，它们是在超类中定义的，没有正确参数化。
What you can do is add @SuppressWarnings("unchecked")to the container.
您可以做的是添加@SuppressWarnings("unchecked")到容器中。
How can I prettify my JSON?
如何美化我的 JSON？
JSON.simple cannot do this, but GSON can:
JSON.simple 不能这样做，但 GSON 可以：
Gson gson = new GsonBuilder().setPrettyPrinting().create();
