I am trying to add a prefix or suffix in the controller at the method level on top of GET, POST, PUT, DELETE mappings.
Controller class
@RestController
@RequestMapping("/something")
public class SomeController {
@PutMapping("/some/path/")
public ResponseEntity<ApiResponse<String>> someMethod() {
....
}
...
}
So, basically, the above request URL should be something like : http://localhost:8080/something/some/path/
Now, I just want to add some prefix or suffix whatever is feasible to the request URL which will be something like : http://localhost:8080/something/read/some/path/ or http://localhost:8080/something/some/path/read/ the extra “/read” which needs to be added to the request URL as a prefix or suffix. I can do this directly by adding this to the PutMapping value, but I want to decorate it somewhat using annotation like @Read
So, the updated Controller class will be like
@RestController
@RequestMapping("/something")
public class SomeController {
@Read
@PutMapping("/some/path/")
public ResponseEntity<ApiResponse<String>> someMethod() {
....
}
...
}
and the same way updated request URL will be like : http://localhost:8080/something/read/some/path/
I am unable to find a better way to do this. Till now I have only achieved adding a class-level prefix using custom annotation.
Can anyone please help with the above requirement.? Thank you !!
I am also curious to know whether is achievable or not even?
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Answer
Using such way of path extension make your code less understandable. (maybe you should read more about RESTful API) But spring can do almost everything you want.
package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.web.servlet.WebMvcRegistrations;
import org.springframework.context.annotation.Bean;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.mvc.method.RequestMappingInfo;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.reflect.Method;
import java.util.stream.Stream;
@SpringBootApplication
public class DemoApplication {
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface Read {
}
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface Write {
}
@Bean
public WebMvcRegistrations webMvcRegistrations() {
return new WebMvcRegistrations() {
@Override
public RequestMappingHandlerMapping getRequestMappingHandlerMapping() {
return new RequestMappingHandlerMapping() {
@Override
protected RequestMappingInfo getMappingForMethod(Method method, Class<?> handlerType) {
RequestMappingInfo defaultRequestMappingInfo = super.getMappingForMethod(method, handlerType);
if (defaultRequestMappingInfo == null) {
return null;
}
String pathSuffix;
if (method.isAnnotationPresent(Read.class)) {
pathSuffix = "read";
} else if (method.isAnnotationPresent(Write.class)) {
pathSuffix = "write";
} else {
return defaultRequestMappingInfo;
}
//extend path by mutating configured request mapping info
RequestMappingInfo.Builder mutateBuilder = defaultRequestMappingInfo.mutate();
mutateBuilder.paths(
defaultRequestMappingInfo.getPatternValues().stream()
.map(path -> path + "/" + pathSuffix)
.toArray(String[]::new)
);
return mutateBuilder.build();
}
};
}
};
}
@RestController
@RequestMapping("/books")
public static class BooksController {
@Read
@GetMapping("/{id}")
public String readBook(@PathVariable("id") String bookId) {
return bookId;
}
}
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
Extension point is here, you can change path like you want.
Example:
request: http://localhost:8080/books/asd
response: 404
output:
2022-06-27 10:49:48.671 DEBUG 8300 --- [nio-8080-exec-2] com.example.demo.DemoApplication$1$1 : Mapped to org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController#errorHtml(HttpServletRequest, HttpServletResponse)
request: http://localhost:8080/books/asd/read
response: asd
output:
. ____ _ __ _ _ /\ / ___'_ __ _ _(_)_ __ __ _ ( ( )___ | '_ | '_| | '_ / _` | \/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |___, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v2.7.0) 2022-06-27 10:48:53.622 INFO 8300 --- [ main] com.example.demo.DemoApplication : Starting DemoApplication using Java 1.8.0_312 on DESKTOP with PID 8300 () 2022-06-27 10:48:53.624 DEBUG 8300 --- [ main] com.example.demo.DemoApplication : Running with Spring Boot v2.7.0, Spring v5.3.20 2022-06-27 10:48:53.625 INFO 8300 --- [ main] com.example.demo.DemoApplication : No active profile set, falling back to 1 default profile: "default" 2022-06-27 10:48:54.227 INFO 8300 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http) 2022-06-27 10:48:54.233 INFO 8300 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat] 2022-06-27 10:48:54.233 INFO 8300 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.63] 2022-06-27 10:48:54.298 INFO 8300 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext 2022-06-27 10:48:54.298 INFO 8300 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 643 ms 2022-06-27 10:48:54.473 DEBUG 8300 --- [ main] com.example.demo.DemoApplication$1$1 : 3 mappings in 'requestMappingHandlerMapping' 2022-06-27 10:48:54.536 INFO 8300 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path '' 2022-06-27 10:48:54.543 INFO 8300 --- [ main] com.example.demo.DemoApplication : Started DemoApplication in 1.199 seconds (JVM running for 1.827) 2022-06-27 10:49:01.196 INFO 8300 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet' 2022-06-27 10:49:01.196 INFO 8300 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet' 2022-06-27 10:49:01.197 INFO 8300 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 1 ms 2022-06-27 10:49:01.210 DEBUG 8300 --- [nio-8080-exec-1] com.example.demo.DemoApplication$1$1 : Mapped to com.example.demo.DemoApplication$BooksController#readBook(String)
dependencies
org.springframework.boot:spring-boot-starter-web
application.properties
logging.level.com.example.demo=debug