java - How to check spring RestController for unknown query params?

Java - How to check spring RestController for unknown query params?

To check for unknown query parameters in a Spring @RestController, you can access the request parameters directly and compare them against a predefined list of expected parameters. Here's how you can achieve this:

import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.RestController; import java.util.HashSet; import java.util.Map; import java.util.Set; @RestController public class MyController { private final Set<String> allowedParams = new HashSet<>(); public MyController() { // Define the list of allowed query parameters allowedParams.add("param1"); allowedParams.add("param2"); // Add more parameters as needed } @GetMapping("/example") public String exampleEndpoint(@RequestParam Map<String, String> params) { // Check for unknown parameters Set<String> unknownParams = new HashSet<>(params.keySet()); unknownParams.removeAll(allowedParams); if (!unknownParams.isEmpty()) { // Handle unknown parameters return "Error: Unknown parameters found: " + unknownParams; } // Process the request with known parameters // ... return "Success"; } }

In this example:

  • We define a Set<String> called allowedParams to store the names of query parameters that are allowed.
  • In the constructor, we populate allowedParams with the names of allowed parameters.
  • In the exampleEndpoint method, we use @RequestParam Map<String, String> params to get all the query parameters passed in the request.
  • We then create a Set<String> called unknownParams to store the names of parameters that are not in the allowedParams set.
  • We use unknownParams.removeAll(allowedParams) to remove all known parameters from the unknownParams set, leaving only unknown parameters.
  • If unknownParams is not empty, it means there are unknown parameters, and we handle this scenario accordingly.
  • If there are no unknown parameters, we process the request as usual.

This approach allows you to explicitly check for unknown query parameters and handle them appropriately within your Spring @RestController.

Examples

  1. "Java Spring RestController unknown query parameters handling"

    Description: This query seeks methods to handle unknown query parameters in a Spring RestController.

    @RestController @RequestMapping("/api") public class MyController { @GetMapping("/endpoint") public ResponseEntity<String> handleRequest(@RequestParam Map<String, String> params) { // Process known parameters in 'params' map // Handle unknown parameters if necessary return ResponseEntity.ok("Request processed successfully"); } }

  2. "Spring RestController ignore unknown query parameters"

    Description: This query aims to find ways to ignore or handle gracefully any unknown query parameters in a Spring RestController.

    @RestController @RequestMapping("/api") public class MyController { @GetMapping("/endpoint") public ResponseEntity<String> handleRequest(@RequestParam MultiValueMap<String, String> params) { // Process known parameters in 'params' map // Ignore unknown parameters return ResponseEntity.ok("Request processed successfully"); } }

  3. "Spring RestController handle unexpected query parameters"

    Description: This query looks for strategies to handle unexpected or unknown query parameters in a Spring RestController.

    @RestController @RequestMapping("/api") public class MyController { @GetMapping("/endpoint") public ResponseEntity<String> handleRequest(@RequestParam(required = false) Map<String, String> params) { // Process known parameters in 'params' map // Log or handle unexpected parameters return ResponseEntity.ok("Request processed successfully"); } }

  4. "Spring RestController handle extra query parameters"

    Description: This query explores techniques to handle additional or unexpected query parameters in a Spring RestController.

    @RestController @RequestMapping("/api") public class MyController { @GetMapping("/endpoint") public ResponseEntity<String> handleRequest(HttpServletRequest request) { Map<String, String[]> paramMap = request.getParameterMap(); // Process known parameters in paramMap // Handle unexpected parameters return ResponseEntity.ok("Request processed successfully"); } }

  5. "Spring RestController filter unknown query parameters"

    Description: This query searches for ways to filter out or handle unknown query parameters in a Spring RestController.

    @RestController @RequestMapping("/api") public class MyController { @GetMapping("/endpoint") public ResponseEntity<String> handleRequest(@RequestParam Map<String, String> params) { // Implement logic to filter known parameters in 'params' map // Handle unknown parameters accordingly return ResponseEntity.ok("Request processed successfully"); } }

  6. "Spring RestController validate query parameters"

    Description: This query focuses on validating and handling both known and unknown query parameters in a Spring RestController.

    @RestController @RequestMapping("/api") public class MyController { @GetMapping("/endpoint") public ResponseEntity<String> handleRequest(@RequestParam Map<String, String> params) { // Validate known parameters in 'params' map // Handle unknown parameters if validation fails return ResponseEntity.ok("Request processed successfully"); } }

  7. "Spring RestController handle unexpected URL parameters"

    Description: This query is about handling unexpected or unknown URL parameters in a Spring RestController.

    @RestController @RequestMapping("/api") public class MyController { @GetMapping("/endpoint") public ResponseEntity<String> handleRequest(@RequestParam Map<String, String> params) { // Process known parameters in 'params' map // Log or handle unexpected URL parameters return ResponseEntity.ok("Request processed successfully"); } }

  8. "Java Spring RestController handle arbitrary query parameters"

    Description: This query aims to find ways to handle arbitrary or unknown query parameters in a Spring RestController.

    @RestController @RequestMapping("/api") public class MyController { @GetMapping("/endpoint") public ResponseEntity<String> handleRequest(@RequestParam Map<String, String> params) { // Process known parameters in 'params' map // Handle arbitrary parameters if necessary return ResponseEntity.ok("Request processed successfully"); } }

  9. "Spring RestController handle unexpected request parameters"

    Description: This query looks for methods to handle unexpected or unknown request parameters in a Spring RestController.

    @RestController @RequestMapping("/api") public class MyController { @GetMapping("/endpoint") public ResponseEntity<String> handleRequest(@RequestParam Map<String, String> params) { // Process known parameters in 'params' map // Handle unexpected parameters if necessary return ResponseEntity.ok("Request processed successfully"); } }

  10. "Java Spring RestController handle unknown query string parameters"

    Description: This query seeks ways to handle unknown query string parameters in a Java Spring RestController.

    @RestController @RequestMapping("/api") public class MyController { @GetMapping("/endpoint") public ResponseEntity<String> handleRequest(HttpServletRequest request) { String queryString = request.getQueryString(); // Parse and handle query string parameters as needed return ResponseEntity.ok("Request processed successfully"); } }

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