From a servlet , I am forwarding the request to a spring controller like below
RequestDispatcher rd = request.getRequestDispatcher("/myController/test?reqParam=value");
rd.forward(request, response);
In order to pass a parameter to the spring controller , I am passing it as request parameter in the forward URL.
Is there a better way of doing this ?
Instead of passing in request parameter , can I pass as a method parameter to the spring controller during forward ?
This will be called when /myController/test?reqParam=value is requested:
#RequestMapping("/myController/test")
public String myMethod(#RequestParam("reqParam") String reqParamValue) {
return "forward:/someOtherUrl?reqParam="+reqParamValue; //forward request to another controller with the param and value
}
Or you can alternatively do:
#RequestMapping("/myController/test")
public String myMethod(#RequestParam("reqParam") String reqParamValue,
HttpServletRequest request) {
request.setAttribute("reqParam", reqParamValue);
return "forward:/someOtherUrl";
}
you can use path variable such as follow without need to use query string parameter:
#RequestMapping(value="/mapping/parameter/{reqParam}", method=RequestMethod.GET)
public #ResponseBody String byParameter(#PathVariable String reqParam) {
//Perform logic with reqParam
}
Related
Is there a way to get the first part of the url path, before /c:
Thats it: /Category1/Subcategory1.1/Subcategory1.1.1/c/{categoryCode:.*}
#Controller
#RequestMapping(value = "/**/c")
public class CategoryPageController {
#RequestMapping(value = "/{categoryCode:.*}", method = RequestMethod.GET)
public ModelAndView viewCategory(#PathVariable String categoryCode,
final HttpServletRequest request) {
String categoryPath = ...
I tried to use AntPathMatcher (extractPathWithinPattern) but I'm not able to define the correct pattern.
inject the request object by simply adding the the HttpServletRequest to the method signature, and
then access the Request Url by calling getRequestURL().
(oh and auto converting answers to comments, stackoverflow jumps the shark)
everyone.
I'm using Spring MVC 4. My App sends activation url to user's email.
Activation url:
www.example.com:8080/myapp/user/activate/$2a$10$Ax2WL93zU3mqjtdxuYlYvuWWyQsPBhkhIfzYHJYk4rdNlAY8qCyC6
But, my App can't find path.
My controller:
#RequestMapping(value = "/user/activate/{hash})
public void activateUser(#PathVariable("hash") String hash) {
userService.activate(hash);
}
What am I doing wrong?
Update:
I've found out that if hash contains dot (".") then throws 404 error.
I've change my url:
www.example.com:8080/myapp/user/activate?code=$2a$10$Ax2WL93zU3mqjtdxuYlYvuWWyQsPBhkhIfzYHJYk4rdNlAY8qCyC6
and my controller:
#RequestMapping(value = "/user/activate)
public void activateUser(#RequestParam("code") String hash) {
userService.activate(hash);
}
It works perfectly.
you are not returning anything from the controller, hence receiving a 404
If you have dot (.) in your path variable value, then you must declare it explicitly in the RequestMapping, as shown below -
#RequestMapping(value = "/download/{attachmentUri:.+}", method = RequestMethod.POST)
#ResponseBody
public ResponseEntity<InputStreamResource> downloadAttachment(#PathVariable("attachmentUri") String attachmentUri,
HttpServletResponse response,
WebRequest webRequest) {
}
I'm using Spring 3.1. I have a controller function that takes in a command object ( a data holder ) submitted via a FORM and does some processing :
#RequestMapping(value = "/results", method = RequestMethod.POST)
public String toResultsScreen(#ModelAttribute("ssdh") SearchScreenDataHolder ssdh,
BindingResult bindingResult,
ModelMap model,
HttpSession session) {
if (bindingResult.hasErrors()) {
logger.debug("Error returning to /search screen");
return "search";
}
netView = "results";
// do stuff
return nextView;
} // end function
Some user would like to programmatically make GET links to obtain information from our site and I would like to set up another handler that would handle that request. It would create a new installation of that the command object ( ssdh ) and populate it with the parameters sent via the GET request. Then it would pass it on to the handler above. Something like this:
#RequestMapping(value = "/pubresult")
public String toPublicResultsScreen(ModelMap model,
HttpSession session,
#RequestParam (required=true) String LNAME,
#RequestParam (required=false)String FNAME){
Search search = new Search(usertype);
// Capture the search parameters sent by HTTP
ssdh.setLast_name(LNAME);
ssdh.setFirst_name(FNAME);
// To Do: "forward this data holder, ssdh to the controller function quoted first
return nextView;
} // end function
My question is how can I forward my command/data holder object to the first controller function such that I don't have to alter the code to the first controller function in any way?
You can use RedirectAttributes object which was introduced in Spring MVC 3.1 and populate it with data you want to keep for redirection. It called PRG (POST/Redirect/GET) pattern.
#RequestMapping(value="/saveUserDetails.action", method=RequestMethod.POST)
public String greetingsAction(#Validated User user,RedirectAttributes redirectAttributes){
//setting attributes
redirectAttributes.addFlashAttribute("firstName", user.getFirstName());
redirectAttributes.addFlashAttribute("lastName", user.getLastName())
return "redirect:success.html";
}
I wrote some technical article regarding how to use it. I believe it will give you more details:
http://www.tikalk.com/java/redirectattributes-new-feature-spring-mvc-31
You should be able to set the ssdh in a ModelAttribute and simply forward it back, this way, the RequestDispatcher should be able to map it back to the /results handler:
#RequestMapping(value = "/pubresult")
public String toPublicResultsScreen(ModelMap model,
HttpSession session,
#RequestParam (required=true) String LNAME,
#RequestParam (required=false)String FNAME, Model model){
Search search = new Search(usertype);
// Capture the search parameters sent by HTTP
ssdh.setLast_name(LNAME);
ssdh.setFirst_name(FNAME);
model.addAttribute("ssdh", ssdh);
return "forward:/results";
}
Use
org.springframework.web.servlet.view.RedirectView
class from spring package to redirect to different page in spring MVC controller. The Baeldung blog page has more details
Sample code:
#RequestMapping(value = "/", method = RequestMethod.GET)
public RedirectView mainMethod() {
return new RedirectView("/login");
}
#RequestMapping(value = "/login", method = RequestMethod.GET)
public ModelAndView mainLogin() {
ModelAndView model = new ModelAndView("login");
return model;
}
i have to call one controller on the basis of first controller i have to call another controller ......
but this is not working in spring 3 mvc........
#Controller
public class ajaxContoller {
#RequestMapping(value="/mmiFacade",method=RequestMethod.POST)
public #ResponseBody String mmiFacade(#RequestParam String sType){
String forwardName = "";
if (sType.equalsIgnoreCase("Pincode")) {
forwardName = "forward:/pincodeAction";
} else if (sType.equalsIgnoreCase("Locality")) {
forwardName = "forward:/localityAction";
} else if (sType.equalsIgnoreCase("Patient")) {
forwardName = "forward:/patientAction";
} else if (sType.equalsIgnoreCase("Dlhdata")) {
forwardName = "forward:/Dlhdata";
}
return forward;
}
#RequestMapping(value="/pincodeAction",method=RequestMethod.POST)
public #ResponseBody String ajax(){
return "hiii";
}
#RequestMapping(value="/localityAction",method=RequestMethod.POST)
public #ResponseBody String ajax1(){
return "hiii1";
}
}
You should return modelandview object. view name starting with "forward:/" will do the job, otherwise Spring does not even try to interpret the response.
Another option to implement a switch and to invoke other mapping as simple call to anther java function.
Returning a String containing the view name does exactly the same thing as returning a ModelAndView object with the view name set to a String. If you just return a String, Spring internally creates a ModelAndView and set the view name to the value of the String.
In your example, you should not annotate the mmiFacade method with #ResponseBody. Using #ResponseBody bypasses the view resolution process, which is where the "forward:" and "redirect:" prefixes in view names are detected and processed.
I have worked servlet that need to convert to Spring MVC controller to have access spring beans etc. Why in normal servlet request.getPathInfo() return not null, but in Spring Controller i get null value ? I know i can use #PathVariable, but wonder why the results of this method is the difference?
#RequestMapping(value = {"/test", "/test/*"})
public void test(HttpServletRequest req, HttpServletResponse res) {
log.info(req.getPathInfo() == null); // true!
if (req.getMethod().equalsIgnoreCase("get")) {
// analogue to doGet...
} else {
// analogue to doPost...
}
}
I think the solution is in the javadoc of getPathInfo()
The extra path information follows the servlet path but precedes the
query string and will start with a "/" character.
In case of Spring the servlet path is the full path hence if you call getServletPath() it will always return the full URI and getPathInfo() will return nothing.