Spring @RequestParam Annotation

Spring-Boot/spring-request-param-annotation/src/main/java/com/javadevjournal/Application.java

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+package com.javadevjournal;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Application {
+
+	public static void main(String[] args) {
+		SpringApplication.run(Application.class, args);
+	}
+
+}
+

Spring-Boot/spring-request-param-annotation/src/main/java/com/javadevjournal/controller/RequestParamController.java

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+package com.javadevjournal.controller;
+
+import org.springframework.util.StringUtils;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.List;
+
+/**
+ * <p></p>This is an the main controller for our @RequestParam annotation post.It conatins different methods to demonstrate
+ * the features of the @RequestParam annotation.</p>
+ */
+@RestController
+public class RequestParamController {
+
+    /**
+     * <p> A very basic method to demonstrate as how to use the @RequestParam annotation.</p>
+     * @param name
+     * @return response
+     */
+    @GetMapping("/greeting")
+    public String sayHello(@RequestParam String name){
+        return "Hello "+name+" !!!";
+    }
+
+
+    /**
+     *<p>Method displaying, how to use parameter name while using this annotation</p>
+     * @param id
+     * @return response
+     */
+    @GetMapping("/getUser")
+    public String getUser(@RequestParam(name = "email") String id){
+        return "It seems we have record for email "+id;
+    }
+
+    /**
+     *<p>Method for demonstrating the use of <em>defaultValue</em> in @RequestParam annotation.</p>
+     * @param name
+     * @return response
+     */
+    @GetMapping("/default-value")
+    public String defaultValueExample(@RequestParam(defaultValue = "Anonymous user") String name){
+        return "Hello "+name+"!!!";
+    }
+
+    /**
+     *<p>Method for demonstrating how to enable optional parameter using this annotation.</p>
+     * @param name
+     * @return response
+     */
+    @GetMapping("/optional")
+    public String optional(@RequestParam(required = false) String name){
+        return getGreeting(name);
+    }
+
+    /**
+     *<p>Multi-value parameter example using <em>@RequestParam</em> annotation</p>
+     * @param id
+     * @return
+     */
+    @GetMapping("/products")
+    public String getProducts(@RequestParam List<String> id){
+        return "Products: "+id;
+    }
+
+
+    private String getGreeting(final String name){
+        if(StringUtils.isEmpty(name)){
+            return "Hello Stranger!!";
+        }
+
+        return "Hello "+name+" !!!";
+    }
+}

Spring-Boot/spring-request-param-annotation/src/test/java/com/javadevjournal/ApplicationTests.java

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+package com.javadevjournal;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class ApplicationTests {
+
+	@Test
+	public void contextLoads() {
+	}
+
+}
+