Android中和服務器進行通訊工具類,包含post,get兩種方式,以及json,form兩種數據格式選擇。
public class HttpUtil {
private static final int CONNECT_TIMEOUT_TIME = 15000;
private static final int READ_TIMEOUT_TIME = 19000;
/**
* POST + JSON
*
* @param data send data
* @param url target url
* @return data receive from server
*/
public static String postJson(String data, String url) {
return doHttpAction(data, true, true, url);
}
/**
* POST + FORM
*
* @param data send data
* @param url target url
* @return data receive from server
*/
public static String postForm(String data, String url) {
return doHttpAction(data, false, true, url);
}
/**
* GET + JSON
*
* @param data send data
* @param url target url
* @return data receive from server
*/
public static String getJson(String data, String url) {
return doHttpAction(data, true, false, url);
}
/**
* GET + FORM
*
* @param data send data
* @param url target url
* @return data receive from server
*/
public static String getForm(String data, String url) {
return doHttpAction(data, false, false, url);
}
private static String doHttpAction(String data, boolean json, boolean post, String url) {
HttpURLConnection connection = null;
DataOutputStream os = null;
InputStream is = null;
Scanner scan = null;
try {
URL sUrl = new URL(url);
connection = (HttpURLConnection) sUrl.openConnection();
connection.setConnectTimeout(CONNECT_TIMEOUT_TIME);
connection.setReadTimeout(READ_TIMEOUT_TIME);
if (post) {
connection.setRequestMethod("POST");
} else {
connection.setRequestMethod("GET");
}
//允許輸入輸出
connection.setDoInput(true);
connection.setDoOutput(true);
// 是否使用緩衝
connection.setUseCaches(false);
// 本次連接是否處理重定向,設置成true,系統自動處理重定向;
// 設置成false,則需要自己從http reply中分析新的url自己重新連接。
connection.setInstanceFollowRedirects(true);
// 設置請求頭裏的屬性
if (json) {
connection.setRequestProperty("Content-Type", "application/json");
} else {
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
connection.setRequestProperty("Content-Length", data.length() + "");
}
connection.connect();
os = new DataOutputStream(connection.getOutputStream());
os.write(data.getBytes(), 0, data.getBytes().length);
os.flush();
os.close();
is = connection.getInputStream();
scan = new Scanner(is);
scan.useDelimiter("\\A");
if (scan.hasNext()) return scan.next();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (connection != null) connection.disconnect();
if (os != null) {
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (is != null) {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (scan != null) scan.close();
}
return null;
}
}