Java的JSON与GSON [英] Java JSON with GSON
问题描述
这里的问题,我用来自Wunderground天气API和使用GSON获取天气时遇到了问题。
Here's the problem, I'm using a weather APi from Wunderground and am having trouble using GSON to fetch the weather.
import java.net.*;
import java.io.*;
import com.google.gson.*;
public class URLReader {
public static URL link;
public static void main(String[] args) {
try{
open();
read();
}catch(IOException e){}
}
public static void open(){
try{
link = new URL("http://api.wunderground.com/api/54f05b23fd8fd4b0/geolookup/conditions/forecast/q/US/CO/Denver.json");
}catch(MalformedURLException e){}
}
public static void read() throws IOException{
Gson gson = new Gson();
// Code to get variables like humidity, chance of rain, ect...
}
}
这是据我得到的,所以有人可以帮我让这件事的工作。我需要能够分析特定变量不只是整个JSON文件。
That is as far as I got, so can someone please help me to get this thing working. I need to be able to parse specific variables not just the entire JSON file.
我使用了一个缓冲的读者,但它读取整个JSON文件。
I used a buffered reader but it read the entire JSON file.
在此先感谢,我是一个初学者,所以还是很容易解释的事情非常简单:)
Thanks in advance, I'm a beginner so go easy and explain things very straightforward :)
推荐答案
您可以分析整个流,然后拉出你所需要的。下面是分析它的一个例子:
You can parse the entire stream, and then pull out what you need. Here's an example of parsing it:
String url=getUrl();
JSONObject jsonObject = new JSONObject();
StringBuilder stringBuilder=new StringBuilder();
try
{
HttpGet httpGet = new HttpGet(url);
HttpClient client = new DefaultHttpClient();
HttpResponse response = client.execute(httpGet);
HttpEntity entity = response.getEntity();
InputStream stream = entity.getContent();
int b;
while ((b = stream.read()) != -1) {
stringBuilder.append((char) b);
}
jsonObject = new JSONObject(stringBuilder.toString());
} catch (JSONException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
} catch (IOException e) { }
阅读它,你必须通过表来浏览你的方式,像这样:
Reading it, you have to navigate your way through the table, something like this:
jsonObject.getJSONObject("Results");
下面是使用这个库我的计划之一的例子:
Here's an example from one of my programs using this library:
int statusCode=jobj.getJSONObject("info").getInt("statuscode");
我大量使用了下列得到它的权利:
I make heavy use out of the following to get it right:
jsonObject.names();
这会给你的所有键的名称。从那里,你必须搞清楚,如果它是一个数组,对象或原始类型。我花了一点得到它的权利,但一旦你做一次它,它永远做,希望。看看 Android的文件上他们的JSON库的。
That will give you the name of all of the keys. From there, you have to figure out if it's an array, an object, or a primitive type. It takes me a bit to get it right, but once you've done it once, it's done forever, hopefully. Take a look at the Android documents on their JSON library.
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