4_Web Service

build.gradle.kts

@@ -19,6 +19,10 @@ repositories {
 
 dependencies {
 	implementation("org.springframework.boot:spring-boot-starter")
+	implementation("org.springframework.boot:spring-boot-starter-web")
+	implementation("org.springframework.boot:spring-boot-starter-thymeleaf")
+	implementation("org.projectlombok:lombok:1.18.30")
+	annotationProcessor("org.projectlombok:lombok:1.18.30")
 	testImplementation("org.springframework.boot:spring-boot-starter-test")
 	testRuntimeOnly("org.junit.platform:junit-platform-launcher")
 }

src/main/java/org/javaspringcourse/controller/HeadersController.java

@@ -0,0 +1,20 @@
+package org.javaspringcourse.controller;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestHeader;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+import java.util.Map;
+
+@Controller
+@RequestMapping("/headers")
+public class HeadersController {
+
+    @GetMapping
+    public String getHeaders(@RequestHeader Map<String, String> headers, Model model) {
+        model.addAttribute("headers", headers);
+        return "headers";
+    }
+}

src/main/java/org/javaspringcourse/controller/JsonController.java

@@ -0,0 +1,25 @@
+package org.javaspringcourse.controller;
+
+import lombok.RequiredArgsConstructor;
+import org.javaspringcourse.exception.BadGatewayException;
+import org.javaspringcourse.model.dto.JsonItemIn;
+import org.javaspringcourse.model.dto.JsonItemOut;
+import org.javaspringcourse.service.JsonService;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@RequiredArgsConstructor
+@RequestMapping("/json")
+public class JsonController {
+    private final JsonService service;
+
+    @PostMapping
+    public JsonItemOut registerJson(@RequestBody JsonItemIn product) {
+        return service.register(product);
+    }
+
+    @GetMapping("/error502")
+    public void getError502() {
+        throw new BadGatewayException("502 Bad Gateway");
+    }
+}

src/main/java/org/javaspringcourse/exception/BadGatewayException.java

@@ -0,0 +1,7 @@
+package org.javaspringcourse.exception;
+
+public class BadGatewayException extends RuntimeException {
+    public BadGatewayException(String message) {
+        super(message);
+    }
+}

src/main/java/org/javaspringcourse/exception/ErrorResponse.java

@@ -0,0 +1,3 @@
+package org.javaspringcourse.exception;
+
+public record ErrorResponse(String code, String message) {}

src/main/java/org/javaspringcourse/exception/JsonExceptionHandler.java

@@ -0,0 +1,16 @@
+package org.javaspringcourse.exception;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+@RestControllerAdvice
+public class JsonExceptionHandler {
+    @ExceptionHandler(BadGatewayException.class)
+    @ResponseStatus(HttpStatus.BAD_GATEWAY)
+    public ErrorResponse handleBadGatewayException(BadGatewayException ex) {
+        return new ErrorResponse("502", ex.getMessage());
+    }
+}

src/main/java/org/javaspringcourse/model/JsonItem.java

@@ -0,0 +1,14 @@
+package org.javaspringcourse.model;
+
+import lombok.Builder;
+import lombok.Data;
+
+import java.util.Date;
+
+@Data
+@Builder
+public class JsonItem {
+    private int id;
+    private double price;
+    private Date date;
+}

src/main/java/org/javaspringcourse/model/dto/JsonItemIn.java

@@ -0,0 +1,16 @@
+package org.javaspringcourse.model.dto;
+
+import lombok.Data;
+
+import java.util.Date;
+
+@Data
+public class JsonItemIn {
+    private double price;
+    private Info info;
+
+    @Data
+    public static class Info {
+        Date date;
+    }
+}

src/main/java/org/javaspringcourse/model/dto/JsonItemOut.java

@@ -0,0 +1,20 @@
+package org.javaspringcourse.model.dto;
+
+import lombok.Builder;
+import lombok.Data;
+
+import java.util.Date;
+
+@Data
+@Builder
+public class JsonItemOut {
+    private double price;
+    private Info info;
+
+    @Data
+    @Builder
+    public static class Info {
+        int id;
+        Date date;
+    }
+}

src/main/java/org/javaspringcourse/service/JsonService.java

@@ -0,0 +1,35 @@
+package org.javaspringcourse.service;
+
+import org.javaspringcourse.model.JsonItem;
+import org.javaspringcourse.model.dto.JsonItemIn;
+import org.javaspringcourse.model.dto.JsonItemOut;
+import org.springframework.stereotype.Service;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Service
+public class JsonService {
+    private final static List<JsonItem> jsonItems = new ArrayList<>();
+
+    public JsonItemOut register(JsonItemIn jsonItem) {
+        var json = JsonItem.builder()
+                .id(jsonItems.size() + 1)
+                .price(jsonItem.getPrice())
+                .date(jsonItem.getInfo().getDate())
+                .build();
+        jsonItems.add(json);
+        return toJsonItemOut(json);
+    }
+
+    private JsonItemOut toJsonItemOut(JsonItem jsonItem) {
+        var info = JsonItemOut.Info.builder()
+                .id(jsonItem.getId())
+                .date(jsonItem.getDate())
+                .build();
+        return JsonItemOut.builder()
+                .price(jsonItem.getPrice())
+                .info(info)
+                .build();
+    }
+}

src/main/resources/templates/headers.html

@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html lang="ru" xmlns:th="http://www.w3.org/1999/xhtml">
+<head>
+    <meta charset="UTF-8">
+    <title>Заголовки запроса</title>
+</head>
+<body>
+    <h1>Заголовки запроса</h1>
+    <table border="1">
+        <tr th:each="header : ${headers.keySet()}">
+            <td th:text="${header}"></td>
+            <td th:text="${headers.get(header)}"></td>
+        </tr>
+    </table>
+</body>
+</html>