Rest

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>3.1.5</version>
+        <relativePath/>
+    </parent>
+    <groupId>com.example</groupId>
+    <artifactId>resttempl</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>resttempl</name>
+    <description>resttempl</description>
+    <properties>
+        <java.version>17</java.version>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

src/main/java/com/evil/rest/RestApplication.java

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+package com.evil.rest;
+
+import com.evil.rest.controller.UserController;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.ConfigurableApplicationContext;
+
+
+@SpringBootApplication
+public class RestApplication {
+
+    public static void main(String[] args) {
+        ConfigurableApplicationContext context = SpringApplication.run(RestApplication.class, args);
+        UserController communication = context.getBean("userController", UserController.class);
+        System.out.println("Answer: " + communication.getCode());
+    }
+}

src/main/java/com/evil/rest/controller/UserController.java

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+package com.evil.rest.controller;
+
+import com.evil.rest.model.User;
+import com.evil.rest.repository.UserRepository;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+
+import java.util.List;
+
+@Controller
+public class UserController {
+    private UserRepository userRepository;
+    private String code = "";
+
+    public UserController(UserRepository userRepository) {
+        this.userRepository = userRepository;
+    }
+
+
+    @GetMapping("/execute")
+    public void executeOperations() {
+        List<User> users = userRepository.getAllUsers();
+
+        if (users != null && !users.isEmpty()) {
+            User user = new User();
+            user.setId(3);
+            user.setName("James");
+            user.setLastName("Brown");
+            user.setAge((byte) 30);
+
+            User createdUser = userRepository.createUser(user);
+            if (createdUser != null) {
+                code += createdUser.getId();
+
+                User updatedUser = new User();
+                updatedUser.setName("Thomas");
+                updatedUser.setLastName("Shelby");
+
+                User modifiedUser = userRepository.updateUser(createdUser.getId(), updatedUser);
+                if (modifiedUser != null) {
+                    code += modifiedUser.getName().substring(1, 3);
+
+                    userRepository.deleteUser(modifiedUser.getId());
+                    code += modifiedUser.getName().substring(4);
+                }
+            }
+        }
+    }
+
+    @GetMapping("/code")
+    public String getCode() {
+        return code;
+    }
+
+
+}

src/main/java/com/evil/rest/model/User.java

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+package com.evil.rest.model;
+public class User {
+    private int id;
+    private String name;
+    private String lastName;
+    private byte age;
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(byte age) {
+        this.age = age;
+    }
+}
+

src/main/java/com/evil/rest/repository/UserRepository.java

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+package com.evil.rest.repository;
+
+import com.evil.rest.model.User;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+
+@Repository
+public interface UserRepository {
+    List<User> getAllUsers();
+
+    User createUser(User user);
+
+    User updateUser(int id, User user);
+
+    void deleteUser(int id);
+}

src/main/java/com/evil/rest/repository/UserRepositoryImpl.java

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+package com.evil.rest.repository;
+
+
+import com.evil.rest.model.User;
+import org.springframework.core.ParameterizedTypeReference;
+import org.springframework.http.*;
+import org.springframework.stereotype.Repository;
+import org.springframework.web.client.RestTemplate;
+
+import java.util.List;
+
+@Repository
+public class UserRepositoryImpl implements UserRepository {
+    private RestTemplate restTemplate;
+    private String sessionId;
+
+    public UserRepositoryImpl() {
+        this.restTemplate = new RestTemplate();
+    }
+
+    @Override
+    public List<User> getAllUsers() {
+        HttpHeaders headers = new HttpHeaders();
+        if (sessionId != null) {
+            headers.add("Cookie", sessionId);
+        }
+        HttpEntity<?> entity = new HttpEntity<>(headers);
+        ResponseEntity<List<User>> response = restTemplate.exchange("http://94.198.50.185:7081/api/users", HttpMethod.GET, entity, new ParameterizedTypeReference<List<User>>() {});
+        List<User> users = response.getBody();
+
+        if (sessionId == null) {
+            List<String> cookies = response.getHeaders().get("Set-Cookie");
+            if (cookies != null) {
+                for (String cookie : cookies) {
+                    if (cookie.startsWith("session=")) {
+                        sessionId = cookie.split(";")[0];
+                    }
+                }
+            }
+        }
+
+        return users;
+    }
+
+    @Override
+    public User createUser(User user) {
+        HttpHeaders headers = new HttpHeaders();
+        if (sessionId != null) {
+            headers.add("Cookie", sessionId);
+        }
+        headers.setContentType(MediaType.APPLICATION_JSON);
+        HttpEntity<User> request = new HttpEntity<>(user, headers);
+        ResponseEntity<User> response = restTemplate.postForEntity("http://94.198.50.185:7081/api/users", request, User.class);
+        User createdUser = response.getBody();
+
+        return createdUser;
+    }
+
+    @Override
+    public User updateUser(int id, User user) {
+        HttpHeaders headers = new HttpHeaders();
+        if (sessionId != null) {
+            headers.add("Cookie", sessionId);
+        }
+        headers.setContentType(MediaType.APPLICATION_JSON);
+        HttpEntity<User> request = new HttpEntity<>(user, headers);
+        ResponseEntity<User> response = restTemplate.exchange("http://94.198.50.185:7081/api/users/" + id, HttpMethod.PUT, request, User.class);
+        User updatedUser = response.getBody();
+
+        return updatedUser;
+    }
+
+    @Override
+    public void deleteUser(int id) {
+        HttpHeaders headers = new HttpHeaders();
+        if (sessionId != null) {
+            headers.add("Cookie", sessionId);
+        }
+        HttpEntity<?> entity = new HttpEntity<>(headers);
+        restTemplate.exchange("http://94.198.50.185:7081/api/users/" + id, HttpMethod.DELETE, entity, Void.class);
+    }
+}