使用Java的Google Distance Matrix API的HTTP請求

Question

我想從我的Java Standalone Application發出以下HTTP請求，並將輸出的JSON文件保存在我的系統中。

Click Me

我怎麼做這個

Answer 1

您是否嘗試過使用java.net.URL打開一個連接？ （見JavaDoc）。我已經省略了導入語句，但您明白了:)。

URL url = new URL("http://maps.googleapis.com/maps/api/distancematrix/json?origins=Vancouver%20BC%7CSeattle&destinations=San%20Francisco%7CVictoria%20BC&mode=bicycling&language=fr-FR&sensor=false"); 
ReadableByteChannel inputChannel; 
WritableByteChannel outputChannel; 
try { 
    HttpURLConnection connection = (HttpURLConnection) url.openConnection(); 
    InputStream urlStream = connection.getInputStream(); 

    File outputFile = new File("/path/to/output/file"); 
    inputChannel = Channels.newChannel(urlStream); 
    outputChannel = (new FileOutputStream(outputFile)).getChannel(); 

    outputChannel.transferFrom(inputChannel, 0, connection.getContentLength()); 
} catch (IOException ioe) { 
    // handle your exception here 
} finally { 
    //check for nulls and stuff before you do this 
    inputChannel.close(); 
    outputChannel.close(); 
} 

但如果你打算使用RESTful Web服務公平一點，你可能需要調查Jersey。