Json java servlet
Question
I'm building a servlet for a school assignment, the assignment is to build an access point for a airplane with a captive portal (servlet)
The structure is build but the connection with the database is a big question mark.
We have two pages:
- the index page/landing page
- the rerouting page
On page one there is a text field where the user has to fill in his or her ticketnumber.
Under here page 1.
PrintWriter out = response.getWriter();
out.println("<!doctype html>");
out.println("<html lang=\"en-US\">");
out.println("<head>");
out.println("<meta charset=\"utf-8\">");
out.println("<title>Login</title>");
out.println("<link rel=\"stylesheet\" href=\"css/style.css\">");
out.println("</head>");
out.println("<body background=\"images/bg.jpg\">");
out.println("<section>");
out.println("<div id=\"login\">");
out.println("<img class=\"headerImage\" src=\"images/corendon.png\"/>");
out.println("<img class=\"ticketIcon\" src=\"images/ticketIcon.png\"/>");
out.println("<h2></h2>");
out.println("<form name=\"myForm\" action=\"loginPage\" method=\"get\" onSubmit=\"event.preventDefault(); redirect(); return false;\">");
out.println("<fieldset>");
out.println("<p><label for=\"upper\"></label></p>");
out.println("<div>");
out.println("<p><input id=\"ticketnumber\" placeholder=\"ticketnumber..\" name=\"ticketnummer\"/></p>");
out.println("</div>");
out.println("<input type=\"checkbox\" id=\"cb1\" name=\"cb1\"/>");
out.println("<label for=\"cb1\" id=\"cb1text\">Ik accepteer de voorwaarden</label>");
out.println("<p><input type=\"submit\" value=\"Go Online\"></p>");
out.println("<p><span id=\"validation\"></span></p>");
out.println("</fieldset>");
out.println("</form>");
out.println("</div>");
out.println("</section>");
out.println("<script type=text/javascript>");
out.println("function redirect(){");
out.println("var x = document.myForm.ticketnummer.value;");
out.println("var ticketnummer = \"1234\";");
out.println("if ((cb1.checked == 1)&&(x == ticketnummer)){");
out.println("window.location=\"loginPage?ticketnummer=\" + x");
out.println("}else {");
out.println("document.getElementById('validation').innerHTML=\"login onsuccesvol\";");
out.println("return false;");
out.println("}");
out.println("}");
out.println("</script>");
out.println("</body>");
out.println("</html>");
onder here page 2:
PrintWriter out = response.getWriter();
String ticketNumber = request.getParameter("ticketnummer");
// ip address
String ipAddress = request.getHeader("X-FORWARDED-FOR");
if (ipAddress == null)
{
ipAddress = request.getRemoteAddr();
};
out.println("<!doctype html>");
out.println("<html lang=\"en-US\">");
out.println("<head>");
out.println("<meta charset=\"utf-8\">");
out.println("<title>LoginAccepted</title>");
out.println("<link rel=\"stylesheet\" href=\"css/styleLoginPage.css\">");
out.println("</head>");
out.println("<body background=\"images/bg.jpg\">");
out.println("<section>");
out.println("<div id=\"login\">");
out.println("<img class=\"headerImage\" src=\"images/corendon.png\"/>");
out.println("<h2></h2>");
out.println("<form>");
out.println("<fieldset>");
out.println("<p><label for=\"upper\"></label></p>");
out.println("<div id=\"welcome\">");
out.println("U bent nu ingelogd in het netwerk!");
out.println("Corendon wenst u een fijne vlucht en");
out.println("veel internetplezier toe.");
out.println("<img class=\"loginImage\" src=\"images/loginImage.png\"/>");
out.println("</div>");
out.println("</fieldset>");
out.println("</form>");
out.println("</div> <!-- end login -->");
out.println("</section>");
out.println("</body>");
out.println("</html>");
if (ticketNumber.equals("1234")) {
try {
Runtime rt = Runtime.getRuntime ();
Process process = rt.exec ("/var/apache-tomcat-8.0.23/unblock.sh " + ipAddress);
InputStreamReader reader =
new InputStreamReader ( process.getInputStream () );
BufferedReader buf_reader =
new BufferedReader ( reader );
String line;
while ((line = buf_reader.readLine ()) != null)
System.out.println (line);
}
catch (IOException e) {
System.out.println (e);
}
}
my question: how do I add the json query in these scripts?
for example:
{
"function":"List",
"teamId": "IN[key]",
"teamKey":"[key]",
"requestId": "0"
}
the feedback will be:
{"requestId":"0", "result":"0", "passengers":[{"uni":"d565c05f-596b-46a2-b302-a055148b8fb1","surName":"Boogaard","firstName":"Chiel"},{"uni":"e431fc48-c2bf-4e84-a7c6-414e5b86dff9","surName":"","firstName":""},{"uni":"1c7e3cee-b445-45ab-9397-cdc7c80370c8","surName":"Wolf","firstName":"Jesse"},{"uni":"22ad0d5c-698e-4711-9b91-e21bf9d6e932","surName":"Hansali","firstName":"Amin"}]}
and the ticket number request:
{
"function":"List",
"teamId": "IN103-1",
"teamKey": "c2f590a4-abab-4e73-b65f-1aef785c6c75",
"requestId" : "0"
}
and feedback:
{"requestId":"0", "result":"0", "tickets":[{"uni":"e092058c-da83-4970-829a-a56a516fd6a3","usedInternet":"0","uniPassenger":"e431fc48-c2bf-4e84-a7c6-414e5b86dff9","uniFlight":"719d922c-e38d-4aac-afe2-4a36ba900865","ticketNumber":"1234567890"}]}
how do I check the filled in ticketnumber in the servlet with the database using json? by the way I cannot use PHP or ASP
1 answers
solution1
2 ACCPTED 2015-12-14 14:23:16
You did mess with your project. Please follow: 1. Create jsp file in the web folder - there are your request and response params. Freely use html here. If there are problems include jsp-api.jar into the project.
Use JQuery in your front end project. Download jquery from anywhere there are tons of copies on the internet - download only one of them. Include jquery.js file in above mentioned jsp.
Open a script tag and then write:
function queryData(your_query_object){
$.ajax({
url: 'some_servlet',
type: 'GET',
data: your_query_object,
success: function(response){
alert(response);
},
error: function(reason){
alert(reason);
}
});
}
Then call that function with your query object:
queryData(queryObject);
By calling this function you are sending http request to some servlet. And handle the request just as you do it in usual cases - parameter names are just as you put in your json query object. Your query object is
{ "function":"List", "teamId": "IN103-1", "teamKey": "c2f590a4-abab-4e73-b65f-1aef785c6c75", "requestId" : "0" }
So get these values in the servlet like this:
request.getParameter("function");
I am supposing you know javascript, you know also http rules; and I hope you have learned how servlet-mapping is done. If NO you should go and read something about webapp with java and javascript.
Also consider no one makes your homework for you.
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