根据Spring请求的参数返回了不同的东西？

Question

I wonder if there's a possibility for a method to return different things based on what param was requested. An example:

@RestController
public class GreetingController {

private static final String templateForName = "Hello, %s!";
private static final String templateForTest = "Testing new output, which is %s!";

@RequestMapping("/greeting")
public Greeting greeting(@RequestParam(value="name", defaultValue="World") String name
                        ,@RequestParam(value="test", defaultValue="TEST value") String test
                        ) {
                //An if here that would decide which param was requested?
                return new Greeting(String.format(templateForName, name));

}

This here would display, for example, "Hello, User!" if requested with ?name=User Is it possible to display "Testing new output, which is test!" is requested with ?test=test

I am only just starting doing anything with Spring, so if something is unclear or information provided is insufficient, do let me know and I'll try to explain better.

Answer 1

You can simply add the if else conditions to return the proper greeting object as below:

@RequestMapping("/greeting")
    public String greeting(@RequestParam(value="name", defaultValue="World") String name
                            ,@RequestParam(value="test", defaultValue="TEST value") String test
                            ) {
         Greeting greeting = null;
        if(name.equals("User")) {
             greeting = new Greeting(String.format(templateForName, name));
        } else if(test.equals("test"))  {
              greeting = new Greeting(String.format(templateForTest, test));
        }
        return greeting;
    }

Answer 2

Per my comment, using PATH params:

@RequestMapping("/greeting/name/{name}")
public Greeting nameGreeting(@PathParam(value="name", defaultValue="World") String name) {

    return new Greeting(String.format(templateForName, name));

}

@RequestMapping("/greeting/test/{test}")
public Greeting testGreeting(@PathParam(value="test", defaultValue="TEST value") String name) {

    return new Greeting(String.format(templateForTest, test));

}

Answer 3

Just use one @RequestParam and test for the value you're looking for.

@RequestMapping("/greeting")
public String greeting(@RequestParam(value="name", defaultValue="World") String name) {
    if(name.equals("Test")) {
         return new Greeting(String.format(templateForTest, test));
    } 
    return new Greeting(String.format(templateForName, name));
}