Execute doGet in Servlet from java prgram
Question
I try execute method doGet (just show popup) in servlet from java program.
Code in java program:
URL url = new URL( "http://localhost:9999/xxx/screen?msg=VVU6" );
BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
line = in.readLine();
System.out.println( line );
in.close();
Code in doGet:
PrintWriter out = response.getWriter();
out.println("<script type='text/javascript'>");
out.println("alert('peek-a-boo');");
out.println("</script>");
But, when run it not show popup alert, it just print data in console.
May you help me in this case ?
Thanks all!
3 answers
solution1
0 2017-10-13 09:34:02
您可以使用Selenium Web驱动程序与来自Java代码的URL进行交互： http : //www.seleniumhq.org/docs/03_webdriver.jsp
solution2
0 2017-10-13 09:39:37
The code you have written in doGet writes the markup you have written to the outputstream . When the URL mapped to the servlet is hit from a web browser or a browser equivalent(web drivers or in-memory browsers for example), it will be rendered as a html markup .
Read the basics of J2EE servlet and JSP to get a clear understanding of the usage and use case. A console cannot be used to generate popups.
solution3
0 2017-10-13 09:45:59
pre-condition : your Servlet is running in a Servlet Container (Jetty, Tomcat) at http://localhost:9999/xxx
If your routing is correct, (you access the doGet method in your Servlet by pointing your browser at http://localhost:9999/xxx/screen ) you should be able to see the alert with:
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html><head></head><body>");
out.println("<script>alert('peek-a-boo');</script>");
out.println("</body></html>");
If you wanna perform the GET from a JavaSE program please give a look to any small REST Client library like Unirest to be up to speed quickly.
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