用Java硬编码@PathVariable

Question

I am new to java and am still trying to wrap around my mind around many of its concepts.

Right now in my application that pulls in data from an external api. I am trying to hardcode a path, for now, to make sure that I am getting the response I am expecting (this is a temporary interaction as eventually, I want the app to be stateless. If I pass a hardcoded value for @PathVariable in my controller with the variable defined above the code doesn't read the value.

Where should I be placing the hard-coded value and am I defining it the correct way?

Code:

String identificationCode ="abcd";
@RequestMapping(value ="/download/{identificationCode}", method = RequestMethod.GET)
String downloadDocument(@PathVariable(value="identificationCode") String identificationCode) {
     .
     .
     .
}

Answer 1

value is a alias for name. That means that @PathVariable(value="identificationCode") specifies name of variable for this parameter, but not value. See

Answer 2

Here "/download/{identificationCode}"

identificationCode is not interpolated by the value of the String declared there :

String identificationCode ="abcd";

It will just produce the String : "/download/{identificationCode}" .

You could write it :

@RequestMapping(value ="/download/"+identificationCode, method = RequestMethod.GET)

but it will not work either as identificationCode is not a constant expression.

So what you want is just :

@RequestMapping(value ="/download/abc", method = RequestMethod.GET)

Use this way if you don't need to reference the String somewhere else.

Otherwise as alternative declare identificationCode as a constant expression (and you can also do this static by the way) :

final static String identificationCode ="abcd";

And you could so use it :

@RequestMapping(value ="/download/"+identificationCode, method = RequestMethod.GET)

Answer 3

将{identificationCode}替换为@RequestMapping（value =“ / download / {identificationCode}”“中的硬编码值。稍后，当您需要路径的动态性质时，可以按照当前编码的方式进行操作。