Java Developers-Advanced Routing for Java

Generating a Javascript Router

The generation of Play's Javascript router is the initial step in using it. To reduce the amount of the Javascript code, the router will only expose the routes that you expressly designate.

A Javascript router can be created in two different methods. One is to use template directives to incorporate the router within the HTML page. The alternative is to create Javascript assets through a process that may be downloaded, cached, and shared between pages.

Embedded Router

The @javascriptRouter directive inside a Twirl template can create an embedded router. Usually, this is carried out within the main decorative template.

@()(implicit request: play.mvc.Http.Request)
@helper.javascriptRouter("jsRoutes")(
   routes.javascript.Users.list,
   routes.javascript.Users.get
)

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The name of the global variable containing the router is specified in the first parameter. The second option is a list of Javascript routes that should be added to this router.

Router resource

A router resource may be generated by developing an action that uses the router generator. The syntax is the same as when the router is embedded in a template:

import play.mvc.Http;
import play.routing.JavaScriptReverseRouter;
import play.mvc.Controller;
import play.mvc.Result;

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public Result javascriptRoutes(Http.Request request) {
 return ok(JavaScriptReverseRouter.create(
         "jsRoutes",
         "jQuery.ajax",
         request.host(),
         routes.javascript.Users.list(),
         routes.javascript.Users.get()))
     .as(Http.MimeTypes.JAVASCRIPT);
}

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Add the corresponding route after that:

GET     /javascriptRoutes      controllers.Application.javascriptRoutes(request: Request)

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You may use this action as a resource in your templates after implementing it and adding it to your routes file:

<script type="text/javascript" src="@routes.Application.javascriptRoutes"></script>

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Using the Router

Making a call is easy, for instance,  using jQuery:

$.ajax(jsRoutes.controllers.Users.get(someId))
 .done( /*...*/ )
 .fail( /*...*/ );

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Other attributes made available by the router include the type and the URL (the HTTP method). For instance, the ajax function call made in the example above can also be made as follows:

var r = jsRoutes.controllers.Users.get(someId);
$.ajax({url: r.url, type: r.type, success: /*...*/, error: /*...*/ });

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When other properties, such as success, error, context, etc., need to be set, the strategy above is necessary.

The entire URL string is returned via the methods (not properties) absoluteURL and webSocketURL. Creating a WebSocket connection looks like this:

var r = jsRoutes.controllers.Users.list();
var ws = new WebSocket(r.webSocketURL());
ws.onmessage = function(msg) {
       /*...*/
};

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jQuery Ajax Method Support

You can give the router a function to utilize to execute ajax requests if jQuery isn't your thing or if you want to customize the jQuery ajax technique somehow. The object supplied to the ajax router method must be accepted by this function, and it should be expected that the router has set the type and URL properties on it to the proper way and URL for the router request.

To define this function, including the ajaxMethod method argument in your action, for example:

JavaScriptReverseRouter.create(
   "jsRoutes",
   "myAjaxMethod",
   request.host(),
   routes.javascript.Users.list(),
   routes.javascript.Users.get())

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Frequently Asked Questions

Is Java still in demand in 2022?

In the past two years, recruiters placed it as the third most popular language, making it one of the most vital languages we have seen. Fewer jobs have indeed been available since the outbreak. But it holds everywhere, and it's still a very sought-after language. Learning Java now will pay off in 2022.

What is the path for a Java developer?

The three levels of the Java career ladder are entry-level, mid-level, and senior-level. Java developers are the most common job titles. However, you may also be called software engineers or programmers.

Is Java or Python better?

Python is more adaptable, easier to read, and has a simpler syntax than Java, despite being faster. According to Stack Overflow, this widely used, interpreted language is the fourth most popular coding language.

Which language is more popular, Python or Java?

According to a recent Stack Overflow survey, Python surpasses Java in terms of popularity. These two languages have competed fiercely for popularity, as they have long held a tie for third place with JavaScript.

Conclusion

Finally, you have reached the article's conclusion. Congratulations!! You gained knowledge of the Java developers in this blog. You now have mastery over  Advanced routing for Java.

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