Android - 发送 HTTPS 获取请求

Question

我想向谷歌购物 api 发送一个 HTTPS 获取请求，但是没有什么对我有用，例如，这是我目前正在尝试的:

try {        
    HttpClient client = new DefaultHttpClient();
    HttpGet request = new HttpGet();
    request.setURI(new URI("https://www.googleapis.com/shopping/search/v1/public/products/?key={my_key}&country=&q=t-shirts&alt=json&rankByrelevancy="));
    HttpResponse response = client.execute(request);
} catch (URISyntaxException e) {
    e.printStackTrace();
} catch (ClientProtocolException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}   
return response;

如果有人对如何改进或替换它有任何建议，请告诉我，提前谢谢。

Answer 1

你应该得到一个编译错误。

这是正确的版本:

HttpResponse response = null;
try {        
    HttpClient client = new DefaultHttpClient();
    HttpGet request = new HttpGet();
    request.setURI(new URI("https://www.googleapis.com/shopping/search/v1/public/products/?key={my_key}&country=&q=t-shirts&alt=json&rankByrelevancy="));
    response = client.execute(request);
} catch (URISyntaxException e) {
    e.printStackTrace();
} catch (ClientProtocolException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}   
return response;

因此，现在如果您遇到错误，您的响应将返回为 null。

一旦您获得响应并检查它是否为空，您就会想要获取内容(即您的 JSON)。

http://developer.android.com/reference/org/apache/http/HttpResponse.html http://developer.android.com/reference/org/apache/http/HttpEntity.html http://developer.android.com/reference/java/io/InputStream.html

response.getEntity().getContent();

这为您提供了一个可以使用的 InputStream。如果要将其转换为字符串，请执行以下操作或等效操作:

http://www.mkyong.com/java/how-to-convert-inputstream-to-string-in-java/

public static String convertStreamToString(InputStream inputStream) throws IOException {
    if (inputStream != null) {
        Writer writer = new StringWriter();

        char[] buffer = new char[1024];
        try {
            Reader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"),1024);
            int n;
            while ((n = reader.read(buffer)) != -1) {
                writer.write(buffer, 0, n);
            }
        } finally {
            inputStream.close();
        }
        return writer.toString();
    } else {
        return "";
    }
}

当你有这个字符串时，你需要从它创建一个 JSONObject:

http://developer.android.com/reference/org/json/JSONObject.html

JSONObject json = new JSONObject(inputStreamAsString);

完成!