用Java進行HTTP請求的程式碼範例

採用JDK內建API的方式：

InputStream in = null;

try {
URLConnection connection = new URL(url).openConnection();
connection.setConnectTimeout(1000 * 60); // 設定連線逾時時間: 60s
connection.setReadTimeout(1000 * 60); // 設定讀取逾時時間: 60s
connection.connect();

in = connection.getInputStream();

// 擷取HTTP響應結果
int length;
byte[] buffer = new byte[1024 * 4];
StringBuilder stringBuffer = new StringBuilder();
while ((length = in.read(buffer)) != -1) {
stringBuffer.append(new String(buffer, 0, length));
}
String response = stringBuffer.toString();
}
catch (IOException e) {
// 出錯處理代碼...
}
finally {
// 關閉輸入資料流
FileUtils.close(in);
}

採用Commons HttpClient類庫的方式：

HttpClient client = new HttpClient();
client.getHttpConnectionManager().getParams().setConnectionTimeout(60000); // 設定連線逾時時間: 60s
client.getHttpConnectionManager().getParams().setSoTimeout(600000); // 設定讀取逾時時間: 60s

HttpMethod method = new GetMethod(url); // 以GET方式請求
method.setQueryString("id=1"); // 佈建要求參數
client.executeMethod(method);

// 擷取HTTP響應結果
String response = method.getResponseBodyAsString();

method.releaseConnection(); // 關閉串連