In JAX-RS, you can use @Path to bind URI pattern to a Java method. See following examples to show you how it works.

1. Normal URI Matching

See normal URI matching with @Path annotation.

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.core.Response;
 
@Path("/users")
public class UserRestService {
 
	@GET
	public Response getUser() {
 
		return Response.status(200).entity("getUser is called").build();
 
	}
 
	@GET
	@Path("/vip")
	public Response getUserVIP() {
 
		return Response.status(200).entity("getUserVIP is called").build();
 
	}
}

URI pattern : “/users”

getUser is called

URI pattern : “/users/vip”

getUserVIP is called

2. URI Matching and Parameter

The value within an open brace “{” and close brace “}”, is represents a parameter, and can be access with @PathParam.

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.core.Response;
 
@Path("/users")
public class UserRestService {
 
	@GET
	@Path("{name}")
	public Response getUserByName(@PathParam("name") String name) {
 
		return Response.status(200)
			.entity("getUserByName is called, name : " + name).build();
 
	}
 
}

URI Pattern : “/users/mkyong”

getUserByName is called, name : mkyong

URI Pattern : “/users/abcdefg”

getUserByName is called, name : abcdefg

3. URI Matching and Regular Expression

@Path support complex URI matching with regular expression, via following expression :

{" variable-name [ ":" regular-expression ] "}
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.core.Response;
 
@Path("/users")
public class UserRestService {
 
	@GET
	@Path("{id : \\d+}") //support digit only
	public Response getUserById(@PathParam("id") String id) {
 
	   return Response.status(200).entity("getUserById is called, id : " + id).build();
 
	}
 
	@GET
	@Path("/username/{username : [a-zA-Z][a-zA-Z_0-9]}")
	public Response getUserByUserName(@PathParam("username") String username) {
 
	   return Response.status(200)
		.entity("getUserByUserName is called, username : " + username).build();
 
	}
 
	@GET
	@Path("/books/{isbn : \\d+}")
	public Response getUserBookByISBN(@PathParam("isbn") String isbn) {
 
	   return Response.status(200)
		.entity("getUserBookByISBN is called, isbn : " + isbn).build();
 
	}
 
}

URI Pattern : “/users/999”

getUserById is called, id : 999

URI Pattern : “/users/123456”

getUserById is called, id : 123456

URI Pattern : “/users/username/aaa” , failed, don’t match “[a-zA-Z][a-zA-Z_0-9]“, first character need “[a-zA-Z]“, second character need “[a-zA-Z_0-9]“.

Could not find resource for relative : /users/username/aaa

URI Pattern : “/users/username/a9”

getUserByUserName is called, username : a9

URI Pattern : “users/books/999”

getUserBookByISBN is called, isbn : 999

Download Source Code

Download it – JAX-RS-Path-URI-Matching-Example.zip (6 KB)

References

  1. Using @Path in RESTEasy
  2. JAX-RS @Path
Note : You can find more similar articles at - JAX-RS Tutorials
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