js calls background servlet method instance_javascript skills

1. Use document.form.action method

The relevant source code is as follows:

*.js

[javascript]

Copy code The code is as follows:

document.getElementById("sendPerson").value = SendPerson;
document.getElementById("currentTime").value = currentTime();
document.getElementById ("message").value = message;
document.getElementById("recvPerson").value = recvPerson;
document.chatform.action = "ToHistoryServlet";
document.chatform.submit();
*.html

[html]

Copy code The code is as follows:

  type="hidden" name="currentTime" id="currentTime"> type="hidden" name="message" id="message"> < input
            type="hidden" name="recvPerson" id="recvPerson">

Note that input needs to specify the name attribute so that the servlet can obtain the parameter value
*.java

[java]

Copy code The code is as follows:

public void doPost(HttpServletRequest request , HttpServletResponse response)
throws ServletException, IOException { www.jb51.net

String sendPerson = request.getParameter("sendPerson");
String recvPerson = request.getParameter("recvPerson");
String sendTime = request.getParameter("currentTime");
String message = request.getParameter("message");
Message msg = new Message();
msg.setMessage(message) ;
msg.setRecvPerson(recvPerson);
msg.setSendPerson(sendPerson);
msg.setSendTime(sendTime);
HistoryHandle.addMessage(msg);
}

The disadvantage of this is that the page jumps away. If you want to keep the original page, you can refer to method 2

2.jquery calls background method

[javascript]

Copy code The code is as follows:

$.ajax({
type : "POST",
contentType : "application/json",
url : "ToHistoryServlet?sendPerson=" SendPerson "¤tTime="
currentTime() "&message=" message "&recvPerson= "
recvPerson,
dataType : 'json',
success : function(result) {
alert(result.d);
}
});

The code size is small and easy to use. It is worth recommending. . .