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public String Httpcertify(){
String urlStr = "http://localhost:8080/examples/Certify.jsp";
urlStr = urlStr + "?userid=" + txtUserId.getText() + "&";
urlStr = urlStr + "passwd=" + txtPassWd.getText() + "&";
urlStr = urlStr + "macaddress=" + MacAddress;
try{
URL url = new URL(urlStr);
HttpURLConnection hurlc =(HttpURLConnection)url.openConnection();
hurlc.setFollowRedirects(true);
hurlc.setInstanceFollowRedirects(true);
hurlc.setUseCaches(true);
hurlc.connect();
InputStream is=hurlc.getI
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synchronized(user){
int loginNum = Integer.parseInt(Main_Client_Dia.jtf2.getText().trim());
Main_Client_Dia.jtf2.setText("");
loginNum++;
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