add GET, PUT and DELETE user by id

.gitignore

@@ -7,6 +7,7 @@
 .idea/
 *.iml
 *.iws
+out/
 
 # Mac
 .DS_Store
@@ -17,4 +18,4 @@ target/
 
 #gradle
 .gradle
-build/
+build/

src/main/java/spaceshuttle/controller/UserController.java

@@ -46,4 +46,31 @@ User addUser(@RequestBody User newUser) {
         // @RequestParam means it is a parameter from the GET or POST request
         return userRepository.save(newUser);
     }
+
+    // Homework 1: GET user by id
+    @GetMapping(value = "/{id}")
+    public @ResponseBody
+    User getUserById(@PathVariable Long id) {
+        return userRepository.findOne(id);
+    }
+
+    // Homework 2: PUT user by id
+    @PutMapping(value = "/{id}")
+    public @ResponseBody
+    void updateUserById(@PathVariable Long id,
+                          @RequestParam String username,
+                          @RequestParam String password) {
+        User user = userRepository.findOne(id);
+        user.setUsername(username);
+        user.setPassword(password);
+        userRepository.save(user);
+    }
+
+    // Homework 3: DELETE user by id
+    @DeleteMapping(value = "/{id}")
+    public @ResponseBody
+    void deleteUserById(@PathVariable Long id) {
+        userRepository.delete(id);
+    }
+
 }

src/main/java/spaceshuttle/model/User.java

@@ -7,12 +7,21 @@
 
 @Entity
 public class User {
+
     @Id
     @GeneratedValue(strategy = GenerationType.AUTO)
     private Long id;
     private String username;
     private String password;
 
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
     public String getUsername() {
         return username;
     }