1. 程式人生 > >java定時傳送http請求

java定時傳送http請求

public class HttpRequest {
    /**
     * 向指定URL傳送GET方法的請求
     * 
     * @param url
     *            傳送請求的URL
     * @param param
     *            請求引數,請求引數應該是 name1=value1&name2=value2 的形式。
     * @return URL 所代表遠端資源的響應結果
     */
    public static String sendGet(String url, String param) {
        String result = ""
; BufferedReader in = null; try { String urlNameString = url + "?" + param; URL realUrl = new URL(urlNameString); // 開啟和URL之間的連線 URLConnection connection = realUrl.openConnection(); // 設定通用的請求屬性 connection.setRequestProperty("accept"
, "*/*"); connection.setRequestProperty("connection", "Keep-Alive"); connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)"); // 建立實際的連線 connection.connect(); // 獲取所有響應頭欄位 Map<String, List<String>> map = connection.getHeaderFields(); // 遍歷所有的響應頭欄位
for (String key : map.keySet()) { System.out.println(key + "--->" + map.get(key)); } // 定義 BufferedReader輸入流來讀取URL的響應 in = new BufferedReader(new InputStreamReader( connection.getInputStream())); String line; while ((line = in.readLine()) != null) { result += line; } } catch (Exception e) { System.out.println("傳送GET請求出現異常!" + e); e.printStackTrace(); } // 使用finally塊來關閉輸入流 finally { try { if (in != null) { in.close(); } } catch (Exception e2) { e2.printStackTrace(); } } return result; } /** * 向指定 URL 傳送POST方法的請求 * * @param url * 傳送請求的 URL * @param param * 請求引數,請求引數應該是 name1=value1&name2=value2 的形式。 * @return 所代表遠端資源的響應結果 */ public static String sendPost(String url, String param) { PrintWriter out = null; BufferedReader in = null; String result = ""; try { URL realUrl = new URL(url); // 開啟和URL之間的連線 URLConnection conn = realUrl.openConnection(); // 設定通用的請求屬性 conn.setRequestProperty("accept", "*/*"); conn.setRequestProperty("connection", "Keep-Alive"); conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)"); // 傳送POST請求必須設定如下兩行 conn.setDoOutput(true); conn.setDoInput(true); // 獲取URLConnection物件對應的輸出流 out = new PrintWriter(conn.getOutputStream()); // 傳送請求引數 out.print(param); // flush輸出流的緩衝 out.flush(); // 定義BufferedReader輸入流來讀取URL的響應 in = new BufferedReader( new InputStreamReader(conn.getInputStream())); String line; while ((line = in.readLine()) != null) { result += line; } } catch (Exception e) { System.out.println("傳送 POST 請求出現異常!"+e); e.printStackTrace(); } //使用finally塊來關閉輸出流、輸入流 finally{ try{ if(out!=null){ out.close(); } if(in!=null){ in.close(); } } catch(IOException ex){ ex.printStackTrace(); } } return result; } }
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.TimerTask;

public class MyTask extends TimerTask{
    private int i= 0;
    @Override
    public void run() {
        Calendar c= Calendar.getInstance();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
//      System.out.println("當前時間:"+sdf.format(c.getTime()));
        if(c.get(Calendar.DAY_OF_MONTH)==1){
            i++;
            System.out.println("當前時間:"+sdf.format(c.getTime()));
            System.out.println("第"+i+"次執行任務開始");
            String s=HttpRequest.sendGet("http://localhost:8080/taizhoushopping/test1", "key=555&v=456");
            System.out.println("應答資訊:"+s);
            System.out.println("第"+i+"次執行任務結束");
        }

    }

}
public class Run {
    public static void main(String[] args) {
//        //傳送 GET 請求
//        String s=HttpRequest.sendGet("http://localhost:8080/taizhoushopping/test1", "key=555&v=456");
//        System.out.println(s);

        //傳送 POST 請求
//        String sr=HttpRequest.sendPost("http://localhost:8080/taizhoushopping/test1", "key=123&v=456");
//        System.out.println(sr);

        Run r = new Run();
        r.runtask();
    }




    public void runtask(){

        Calendar c1 = Calendar.getInstance();
        c1.setTime(new Date());

        Timer t = new Timer();


        Calendar c2 = Calendar.getInstance();
        c2.set(Calendar.DAY_OF_MONTH, c1.get(Calendar.DAY_OF_MONTH)+1);
        c2.set(Calendar.HOUR_OF_DAY, 0);
        c2.set(Calendar.SECOND, 0);
        c2.set(Calendar.MINUTE, 0);

        long diffs = c2.getTimeInMillis()-c1.getTimeInMillis();


        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

        MyTask task = new MyTask();
        t.scheduleAtFixedRate(task, diffs, 24*60*60*1000);

    }
}

任務執行:從啟動計時,第二天凌晨第一次執行任務,之後每隔24小時執行一次,若當天時間為每月1號,則傳送http請求