JSON 数组到 Java 对象
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/27628096/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
JSON Array to Java objects
提问by ProblemAnswerQue
I need to parse a json file wich looks like this:
我需要解析一个如下所示的 json 文件：
[
{
"y": 148,
"x": 155
},
{
"y": 135,
"x": 148
},
{
"y": 148,
"x": 154
}
]
And I want to put these X-coordinates and Y-coordinates into an JavaObject Click, that class looks like this:
我想将这些 X 坐标和 Y 坐标放入 JavaObject Click 中，该类如下所示：
public class Click {
int x;
int y;
public Click(int x, int y) {
this.x = x;
this.y = y;
}
public int getX() {
return x;
}
public void setX(int x) {
this.x = x;
}
public int getY() {
return y;
}
public void setY(int y) {
this.y = y;
}
}
I have looked at gson because they say it is quit easy but i dont get it how I can do it from my file.
我看过gson，因为他们说这很容易，但我不知道如何从我的文件中做到这一点。
采纳答案by Yazan
assuming your json string data is stored in variable called jsonStr:
假设您的 json 字符串数据存储在名为的变量中jsonStr：
String jsonStr = getJsonFromSomewhere();
Gson gson = new Gson();
Click clicks[] = gson.fromJson(jsonStr, Click[].class);
回答by Matt
Another solid option is Hymansonit seems to have a pretty solid tutorial. I'm not to familiar with it, so I hope this helps.
另一个可靠的选择是Hymanson它似乎有一个非常可靠的教程。我不熟悉它，所以我希望这会有所帮助。
The main idea is that it uses an object mapper
主要思想是它使用对象映射器
ObjectMapper mapper = new ObjectMapper();
User user = mapper.readValue(new File("c:\user.json"), User.class);
Step 4 should be your best bet, just realize you probably want something other than User.class
第 4 步应该是你最好的选择，只是意识到你可能想要 User.class 以外的东西
EDIT:
编辑：
If you're pretty set on using Gson, perhaps looking at other similar answers will help. This questionis about converting JSON to POJO (Plain Old Java Objects) and their are a few more like it floating around. Again, I'm not super familiar with these and I can try to answer some questions, but I hope this gets you where you need to go.
如果您非常喜欢使用 Gson，也许查看其他类似的答案会有所帮助。这个问题是关于将 JSON 转换为 POJO（Plain Old Java Objects），它们更像是在漂浮。再说一次，我对这些不是很熟悉，我可以尝试回答一些问题，但我希望这能让你到达你需要去的地方。
Happy coding! Leave a comment if you have any questions.
快乐编码！如果您有任何问题，请发表评论。
回答by haley
Check out the Gson API and some examples. I've put the links below!
查看 Gson API 和一些示例。我已经把链接放在下面了！
String jsonString = //your json String
Gson gson = new Gson();
Type typeOfList = new TypeToken<List<Map<String, Integer>>>() {}.getType();
List<Map<String, Integer>> list = gson.fromJson(jsonString, typeOfMap);
List<Click> clicks = new ArrayList<Click>();
for(int i = 0; i < list.size(); i++) {
int x = list.get(i).get("x");
int y = list.get(i).get("y");
clicks.add(new Click(x, y));
}
(http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/google/gson/Gson.html) (http://google-gson.googlecode.com/svn/tags/1.5/src/test/java/com/google/gson/functional/MapTest.java)
( http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/google/gson/Gson.html) ( http://google-gson.googlecode.com/svn/tags/ 1.5/src/test/java/com/google/gson/functional/MapTest.java)
