RequestParam annotation

spring-boot-mvc/src/main/java/com/baeldung/springbootmvc/RequestParamController.java

@@ -0,0 +1,86 @@
+package com.baeldung.springbootmvc;
+
+import java.util.List;
+import java.util.Map;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.ResponseBody;
+import org.springframework.web.multipart.MultipartFile;
+
+
+@Controller
+public class RequestParamController {
+
+    @GetMapping("/api/foos")
+    @ResponseBody
+    public String getFoos(@RequestParam int limit){
+        return "Limit: " + limit;
+    }
+    
+    @GetMapping("/api/bars")
+    @ResponseBody
+    public String getBars(@RequestParam(name = "query") String searchQuery){ 
+        return "Query: " + searchQuery;
+    }
+    
+    @GetMapping("/api/users")
+    @ResponseBody
+    public String getUsers(@RequestParam(required = false) String query){ 
+        return "Query: " + query;
+    }
+    
+    @GetMapping("/api/products")
+    @ResponseBody
+    public String getProducts(@RequestParam(defaultValue = "20") int limit){
+        return "Limit: " + limit;
+    }
+    
+    @PostMapping("/api/foos")
+    @ResponseBody
+    public String updateFoos(@RequestParam Map<String,String> allParams){
+        return "Parameters are " + allParams.entrySet();
+    }
+    
+    @PostMapping("/api/posts")
+    @ResponseBody
+    public String createPost(@RequestParam String content, @RequestParam MultipartFile file){
+        return "File size in bytes: " + file.getSize();
+    }
+    
+    @GetMapping("/api/posts")
+    @ResponseBody
+    public String getPosts(@RequestParam List<String> id){
+        return "ID are " + id;
+    }
+    
+    @GetMapping("/foos/{id}")
+    @ResponseBody
+    public String getFooById(@PathVariable String id){
+        return "ID: " + id;
+    }
+    
+    @GetMapping("/foos")
+    @ResponseBody
+    public String getFooByIdUsingQueryParam(@RequestParam String id){
+        return "ID: " + id;
+    }
+    
+    @GetMapping({"/myfoos/optional", "/myfoos/optional/{id}"})
+    @ResponseBody
+    public String getFooByOptionalId(@PathVariable(required = false) String id){
+        return "ID: " + id;
+    }
+    
+    @GetMapping("/myfoos/optionalParam")
+    @ResponseBody
+    public String getFooByOptionalIdUsingQueryParam(@RequestParam(required = false) String id){
+        return "ID: " + id;
+    }
+    
+    
+    
+}