Calling Java code from JavaScript (Spring boot)

Question

This is my controller:

@Controller
@RequestMapping("/test")
public class TestServlet {
    @RequestMapping("/country/{latitude}-{longitude}")
public String getCountry(@PathVariable String latitude, @PathVariable String longitude, Model  model){
//inject the data in the JSP
model.addAttribute("latitude", latitude);
model.addAttribute("longitude", longitude);
 
//return the html
return "private/private";
}

I want to know how to access this method with parameter from javascript code.

 public String getCountry(@PathVariable String latitude, @PathVariable String longitude, Model  model);

pvpkiran · Accepted Answer · 2017-12-21 15:22:24Z

1

Something like this would do

 $.ajax({
     type : "GET",
     url : "http://<server>:<port>/test/country/<latitudevalue>-<longitudevalue>",
     contentType: "application/json",
     dataType: "json",
     success : function (data, status) {
        ......
     },
     error : function (status) {
        ....
     }
 });

answered Dec 21, 2017 at 15:22

pvpkiran

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Comments

Luca Rospocher · Accepted Answer · 2017-12-21 15:51:41Z

1

I fear that @PathVariable has some problems to correctly recognise variables split by '-'. I'd use other standard characters for this task like '/' or '&'.

Also I'd specify the HTTP method in the @RequestMapping annotation like:

 @RequestMapping(value = "/country/{latitude}-{longitude}", method = RequestMethod.GET)

The js ajax call would be something like:

$.ajax({
 type : "GET",
 contentType: "application/json",
 dataType: "json",
 url : "/test/country/" + lat + "-" + lon,
 success : function (data, status) {
    /*CODE*/
 },
});

answered Dec 21, 2017 at 15:51

Luca Rospocher

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Comments

hhk · Accepted Answer · 2017-12-21 16:21:50Z

If you want to get the result in JSON then you could change the controller as follows,

@Controller
@RequestMapping("/test")
public class TestServlet {

@ResponseBody
@RequestMapping("/country", method = RequestMethod.GET, produces = "application/json")
public Map<String, String> getCountry(@PathVariable String latitude, @PathVariable 
String longitude){

final Map<String, String> messageObject = new HashMap<>();
messageObject.put("latitude", latitude);
messageObject.put("longitude", longitude);

//return the html
return messageObject;
}

Then on the client side,

$.getJSON("/country", {latitude: <latitude>, longitude: <longitude>}, function(data) { 

        if (data != null) {
          for(key in data){
           var lat = data[latitude];
           var long = data[longitude];
          }
        }
     });

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