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I am building a site which submits a url to a servlet for analysis purposes. On the client side, I submit the url as a parameter that is encoded. For example...
Submit: http://www.site.com
Goes to: http://localhost/myservlet/?url=http%3A%2F%2Fwww.site.com
On the server side, I have my servlet request the parameter like so...
String url = request.getParameter("url");
What I receive is a decoded string: http://www.site.com. So far so good -- this works as expected... most of the time.
The problem occurs when a url param contains parameters of its own...
Submit: http://www.site.com?param1=1¶m2=2
Goes to: http://localhost/myservlet/?url=http%3A%2F%2Fwww.site.com%3Fparam1%3D1%26param2%3D2
Everything is fine on the client site, but in my servlet when I get the parameter I receive only part of the url param!
http://www.site.com?param1=1
It dropped the second param from my input url param! I am definitely encoding the url param before submitting it to the server... what is going on?
870
getParameter() method to get the value of a form parameter. getParameterValues() − Call this method if the parameter appears more than once and returns multiple values, for example checkbox. getParameterNames() − Call this method if you want a complete list of all parameters in the current request.
getParameter(java.lang.String name) Returns the value of a request parameter as a String , or null if the parameter does not exist.
Request parameters are extra information sent with the request. For HTTP servlets, parameters are contained in the query string or posted form data. If the parameter data was sent in the request body, then i occurs with an HTTP POST request.
You can pass parameters to an HTTP servlet during initialization by defining these parameters in the Web application containing the servlet. You can use these parameters to pass values to your servlet every time the servlet is initialized without having to rewrite the servlet.
I can't reproduce your problem on Tomcat 6.0.29. There's more at matter. Maybe a Filter in the chain which is doing something with the request object?
Anyway, here's a SSCCE in flavor of a single JSP:
<!DOCTYPE html>
<html lang="en">
<head>
<title>Test</title>
</head>
<body>
<p><a href="?url=http%3A%2F%2Fwww.site.com%3Fparam1%3D1%26param2%3D2">click here</a>
<p>URL: ${param.url}
</body>
</html>
Copy'n'paste'n'run it and click the link. Right here I see the following result:
click here
URL: http://www.site.com?param1=1¶m2=2
The same is reproducible with a simple servlet like this which is invoked directly by browser address bar:
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.getWriter().write(request.getParameter("url"));
}
Tomcat is by the way configured with URIEncoding="UTF-8" in HTTP connector, but even with ISO-8859-1 (which is the default), the behaviour is -as expected in this particular case- the same.
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