CODEWITHSUNDEEP
javaspringspring-mvcvariables
user3369592
user3369592

Reputation: 1447

best way to create a global variable in Spring MVC

All of my controllers (requestMapping url) start with the same variable.

myController/blablabal

I am thinking about creating a global variable to replace "myController" so in the future if I change the URL name, I only need to change at one place. The way I am currently doing this is to create a bean. My bean config file:

<bean id="controllerURL" class="java.lang.String">
    <constructor-arg type="String" value="tt"/>
</bean>

Then in my controller:

@RequestMapping(value ="/${controllerURL}/qrcode/blablbal", method = RequestMethod.GET)

However, it seems that I can not access this variable controllerURL correctly. Am I missing anything here? Or do we have a better way to create a global variable in Spring MVC?

Upvotes: 0

Views: 22153

Answers (3)

carlos_technogi
carlos_technogi

Reputation: 198

I would create a BaseController with the base URL 

import org.springframework.web.bind.annotation.RequestMapping;


@RequestMapping("/base")
public class BaseController {
}

and implement it

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;


@RestController
public class MyController extends BaseController{

    @RequestMapping("/hello")
    String hello(){
        return "Hello";
    }
}

Upvotes: 2

Sundararaj Govindasamy
Sundararaj Govindasamy

Reputation: 8495

You can create global variable using bean as below.

1.In your bean declaration,

Use java.lang.String instead of String in constructor type attribute. 

<bean id="controllerURL" class="java.lang.String">
    <constructor-arg type="java.lang.String" value="tt"/>
</bean>

  1. In your Controller,

    @Autowired String controllerURL;

and

@RequestMapping(value = controllerURL +"/qrcode/blablbal", method = RequestMethod.GET)

Upvotes: 1

Andreas
Andreas

Reputation: 159106

Create a constant and use it. The compiler will merge the constant and the remaining url at compile-time.

public class MyConstants {
    public static final String PATH_PREFIX = "/myController/blablabal";
}

import MyConstants.PATH_PREFIX;

@Controller
public class MyController {
    @RequestMapping(path = PATH_PREFIX + "/qrcode/blablbal", method = RequestMethod.GET)
    // method here
}

Upvotes: 1

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