java定時傳送http請求
阿新 • • 發佈:2019-01-08
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