add rest controller

build.gradle

@@ -31,5 +31,6 @@ dependencies {
     implementation group: 'javax.validation', name: 'validation-api', version: '2.0.1.Final'
     implementation group: 'javassist', name: 'javassist', version: '3.12.1.GA'
     implementation group: 'junit', name: 'junit'
+    implementation group: 'org.springdoc', name: 'springdoc-openapi-ui', version: '1.6.5'
 }
 

src/main/java/email/AjaxController.java

@@ -2,6 +2,7 @@ package email;
 
 import email.model.Email;
 import email.service.EmailService;
+import io.swagger.v3.oas.annotations.Hidden;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PathVariable;
@@ -13,6 +14,7 @@ import org.springframework.web.bind.annotation.ResponseBody;
 import java.util.List;
 
 @Controller
+@Hidden
 @RequestMapping("/ajax")
 public class AjaxController {
     private final EmailService emailService;

src/main/java/email/EmailRestController.java

@@ -0,0 +1,48 @@
+package email;
+
+import email.model.Email;
+import email.service.EmailService;
+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.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.ResponseBody;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/rest")
+public class EmailRestController {
+    private final EmailService emailService;
+
+    public EmailRestController(EmailService emailService) {
+        this.emailService = emailService;
+    }
+
+    @ResponseBody
+    @GetMapping("/getEmail/{id}")
+    public Email getEmail(@PathVariable("id") Integer id) {
+        return emailService.getEmailById(id);
+    }
+
+    @ResponseBody
+    @GetMapping("/list")
+    public List<Email> getList() {
+        return emailService.getAllEmails();
+    }
+
+    @ResponseBody
+    @PostMapping("/saveEmail")
+    public Email saveEmail(@RequestBody Email email) {
+        if (email.getTo().isEmpty()) {
+            throw new RuntimeException("Поле 'Кому' не должно быть пустым");
+        }
+        Email previousEmail = emailService.getEmailById(email.getId());
+        previousEmail.setMessage(email.getMessage());
+        previousEmail.setSubject(email.getSubject());
+        previousEmail.setTo(email.getTo());
+        return emailService.save(previousEmail);
+    }
+}