\uc774\uc81c \uc2a4\ud504\ub9c1 \ubd80\ud2b8\ub97c \uc0ac\uc6a9\ud558\uc5ec \uac04\ub2e8\ud55c RESTful API\ub97c \ub9cc\ub4e4\uc5b4 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \uc5ec\uae30\uc11c\ub294 \uc790\uc6d0\uc73c\ub85c ‘\ub3c4\uc11c’\ub97c \uad00\ub9ac\ud558\ub294 API\ub97c \uad6c\ud604\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n
\uba3c\uc800 ‘\ub3c4\uc11c’ \ub3c4\uba54\uc778 \ubaa8\ub378\uc744 \uc815\uc758\ud569\ub2c8\ub2e4. \ub3c4\uc11c\uc758 \uc18d\uc131\uc73c\ub85c\ub294 ID, \uc81c\ubaa9, \uc800\uc790, \ucd9c\ud310 \uc5f0\ub3c4\ub97c \ud3ec\ud568\ud560 \uac83\uc785\ub2c8\ub2e4.<\/p>\n
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package com.example.demo.model;\n\nimport javax.persistence.Entity;\nimport javax.persistence.GeneratedValue;\nimport javax.persistence.GenerationType;\nimport javax.persistence.Id;\n\n@Entity\npublic class Book {\n @Id\n @GeneratedValue(strategy = GenerationType.IDENTITY)\n private Long id;\n \n private String title;\n private String author;\n private int year;\n\n \/\/ getter\uc640 setter \uc0dd\ub7b5\n}\n <\/code><\/pre>\n<\/div>\n5.2 \ub9ac\ud3ec\uc9c0\ud1a0\ub9ac \uc778\ud130\ud398\uc774\uc2a4 \uc0dd\uc131<\/h3>\n
JPA\ub97c \uc0ac\uc6a9\ud558\uc5ec \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc640 \uc0c1\ud638\uc791\uc6a9\ud558\ub294 \ub9ac\ud3ec\uc9c0\ud1a0\ub9ac \uc778\ud130\ud398\uc774\uc2a4\ub97c \uc0dd\uc131\ud569\ub2c8\ub2e4.<\/p>\n
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package com.example.demo.repository;\n\nimport com.example.demo.model.Book;\nimport org.springframework.data.jpa.repository.JpaRepository;\n\npublic interface BookRepository extends JpaRepository<Book, Long> {\n}\n\n <\/code><\/pre>\n<\/div>\n5.3 \uc11c\ube44\uc2a4 \ud074\ub798\uc2a4 \uc0dd\uc131<\/h3>\n
\ube44\uc988\ub2c8\uc2a4 \ub85c\uc9c1 \ucc98\ub9ac\ub97c \uc704\ud55c \uc11c\ube44\uc2a4 \ud074\ub798\uc2a4\ub97c \uc0dd\uc131\ud569\ub2c8\ub2e4. \uc774 \ud074\ub798\uc2a4\ub294 \ub9ac\ud3ec\uc9c0\ud1a0\ub9ac\ub97c \ud65c\uc6a9\ud558\uc5ec \ub3c4\uc11c \ub370\uc774\ud130\ub97c \ucd94\uac00\ud558\uace0 \uc870\ud68c\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
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package com.example.demo.service;\n\nimport com.example.demo.model.Book;\nimport com.example.demo.repository.BookRepository;\nimport org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.stereotype.Service;\n\nimport java.util.List;\n\n@Service\npublic class BookService {\n @Autowired\n private BookRepository bookRepository;\n\n public List<Book> getAllBooks() {\n return bookRepository.findAll();\n }\n\n public Book addBook(Book book) {\n return bookRepository.save(book);\n }\n}\n <\/code><\/pre>\n<\/div>\n5.4 \ucee8\ud2b8\ub864\ub7ec \ud074\ub798\uc2a4 \uc0dd\uc131<\/h3>\n
\ud074\ub77c\uc774\uc5b8\ud2b8\uc758 \uc694\uccad\uc744 \ucc98\ub9ac\ud558\uae30 \uc704\ud55c REST \ucee8\ud2b8\ub864\ub7ec\ub97c \uc0dd\uc131\ud569\ub2c8\ub2e4. \uc774 \ucee8\ud2b8\ub864\ub7ec\ub97c \ud1b5\ud574 API\uc758 \uc5d4\ub4dc\ud3ec\uc778\ud2b8\ub97c \uc815\uc758\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
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package com.example.demo.controller;\n\nimport com.example.demo.model.Book;\nimport com.example.demo.service.BookService;\nimport org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.web.bind.annotation.*;\n\nimport java.util.List;\n\n@RestController\n@RequestMapping(\"\/api\/books\")\npublic class BookController {\n @Autowired\n private BookService bookService;\n\n @GetMapping\n public List<Book> getAllBooks() {\n return bookService.getAllBooks();\n }\n\n @PostMapping\n public Book addBook(@RequestBody Book book) {\n return bookService.addBook(book);\n }\n}\n <\/code><\/pre>\n<\/div>\n5.5 \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uc2e4\ud589\ud558\uae30<\/h3>\n
\uc774\uc81c \ubaa8\ub4e0 \uc124\uc815\uc774 \uc644\ub8cc\ub418\uc5c8\uc2b5\ub2c8\ub2e4. DemoApplication<\/strong> \ud074\ub798\uc2a4\uc5d0\uc11c main<\/code> \uba54\uc18c\ub4dc\ub97c \uc2e4\ud589\ud558\uc5ec \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \uc2dc\uc791\ud569\ub2c8\ub2e4.<\/p>\n<\/section>\n\n6. Postman\uc744 \uc0ac\uc6a9\ud574 API \ud14c\uc2a4\ud2b8\ud558\uae30<\/h2>\n
Postman\uc744 \uc774\uc6a9\ud558\uc5ec \uc6b0\ub9ac\uac00 \ub9cc\ub4e0 API\uac00 \uc81c\ub300\ub85c \uc791\ub3d9\ud558\ub294\uc9c0 \ud14c\uc2a4\ud2b8\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \ub2e4\uc74c\uacfc \uac19\uc740 \uc808\ucc28\ub97c \ub530\ub985\ub2c8\ub2e4:<\/p>\n
\n- Postman \uc2e4\ud589:<\/strong> Postman \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \uc5f4\uace0 \uc0c8\ub85c\uc6b4 \uc694\uccad\uc744 \ub9cc\ub4ed\ub2c8\ub2e4.<\/li>\n
- GET \uc694\uccad\ud558\uae30:<\/strong> URL\uc5d0
http:\/\/localhost:8080\/api\/books<\/code>\ub97c \uc785\ub825\ud558\uace0 GET \uc694\uccad\uc744 \ubcf4\ub0c5\ub2c8\ub2e4. \uc751\ub2f5\uc73c\ub85c \ud604\uc7ac \ub3c4\uc11c \ubaa9\ub85d\uc774 \ub098\uc640\uc57c \ud569\ub2c8\ub2e4.<\/li>\n- POST \uc694\uccad\ud558\uae30:<\/strong> \uc0c8\ub85c\uc6b4 \ub3c4\uc11c\ub97c \ucd94\uac00\ud558\uae30 \uc704\ud574 URL\uc5d0
http:\/\/localhost:8080\/api\/books<\/code>\ub97c \uc785\ub825\ud558\uace0, POST \uc694\uccad\uc744 \uc124\uc815\ud569\ub2c8\ub2e4. Body\ub97c JSON \ud615\uc2dd\uc73c\ub85c \uc124\uc815\ud558\uc5ec \ub3c4\uc11c \uc815\ubcf4\ub97c \uc785\ub825\ud569\ub2c8\ub2e4.<\/li>\n<\/ol>\n<\/section>\n\n7. \ub370\uc774\ud130\ubca0\uc774\uc2a4 \uc5f0\ub3d9<\/h2>\n
\uc774\ubc88 \uc139\uc158\uc5d0\uc11c\ub294 \uc2a4\ud504\ub9c1 \ubd80\ud2b8\ub97c H2 \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc640 \uc5f0\ub3d9\ud558\ub294 \ubc29\ubc95\uc5d0 \ub300\ud574 \uc54c\uc544\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. H2 \ub370\uc774\ud130\ubca0\uc774\uc2a4\ub294 \uc778\uba54\ubaa8\ub9ac \ub370\uc774\ud130\ubca0\uc774\uc2a4\ub85c, \ud14c\uc2a4\ud2b8 \ubc0f \uac1c\ubc1c\uc5d0 \uc801\ud569\ud569\ub2c8\ub2e4.<\/p>\n
7.1 \ub370\uc774\ud130\ubca0\uc774\uc2a4 \uc124\uc815<\/h3>\n
\uc2a4\ud504\ub9c1 \ubd80\ud2b8 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc758 application.properties<\/code> \ud30c\uc77c\uc5d0\uc11c H2 \ub370\uc774\ud130\ubca0\uc774\uc2a4 \uc124\uc815\uc744 \ucd94\uac00\ud569\ub2c8\ub2e4:<\/p>\n\n
spring.datasource.url=jdbc:h2:mem:testdb\nspring.datasource.driverClassName=org.h2.Driver\nspring.datasource.username=sa\nspring.datasource.password=\nspring.h2.console.enabled=true\nspring.jpa.database-platform=org.hibernate.dialect.H2Dialect\n <\/code><\/pre>\n<\/div>\n7.2 \ub370\uc774\ud130 \ucd08\uae30\ud654<\/h3>\n
\uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uc2e4\ud589 \uc2dc \uae30\ubcf8 \ub370\uc774\ud130\ub97c \ucd94\uac00\ud558\ub824\uba74 data.sql<\/code> \ud30c\uc77c\uc744 \uc0ac\uc6a9\ud558\uc5ec \ucd08\uae30 \ub370\uc774\ud130\ub97c \uc124\uc815\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n
INSERT INTO book (title, author, year) VALUES ('\uc774\uac83\uc774 \uc790\ubc14\ub2e4', '\uc2e0\uc6a9\uad8c', 2020);\nINSERT INTO book (title, author, year) VALUES ('Spring in Action', 'Craig Walls', 2018);\n <\/code><\/pre>\n<\/div>\n<\/section>\n\n8. \uc608\uc678 \ucc98\ub9ac<\/h2>\n
\uc0dd\uc131\ub41c API\uc5d0\uc11c \ubc1c\uc0dd\ud560 \uc218 \uc788\ub294 \uc608\uc678\ub97c \ucc98\ub9ac\ud558\ub294 \ubc29\ubc95\uc5d0 \ub300\ud574 \uc54c\uc544\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \uc2a4\ud504\ub9c1\uc5d0\uc11c\ub294 @ControllerAdvice<\/code>\ub97c \uc0ac\uc6a9\ud558\uc5ec \uc804\uc5ed\uc801\uc73c\ub85c \uc608\uc678 \ucc98\ub9ac\ub97c \ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n
package com.example.demo.exception;\n\nimport org.springframework.http.HttpStatus;\nimport org.springframework.http.ResponseEntity;\nimport org.springframework.web.bind.annotation.ControllerAdvice;\nimport org.springframework.web.bind.annotation.ExceptionHandler;\n\n@ControllerAdvice\npublic class GlobalExceptionHandler {\n \n @ExceptionHandler(Exception.class)\n public ResponseEntity<String> handleException(Exception e) {\n return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(e.getMessage());\n }\n}\n <\/code><\/pre>\n<\/div>\n\uc774\ub807\uac8c \uc124\uc815\ud558\uba74 \ubaa8\ub4e0 \uc608\uc678\uac00 \ucc98\ub9ac\ub418\uc5b4 \ud074\ub77c\uc774\uc5b8\ud2b8\uc5d0 \uc801\uc808\ud55c \uc751\ub2f5\uc744 \ubc18\ud658\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<\/section>\n\n9. \ud074\ub77c\uc774\uc5b8\ud2b8\uc640\uc758 \ud1b5\uc2e0<\/h2>\n
\uc774\ubc88 \uc139\uc158\uc5d0\uc11c\ub294 \ud074\ub77c\uc774\uc5b8\ud2b8\uc640 \uc11c\ubc84 \uac04\uc758 \ud1b5\uc2e0 \ubc29\ubc95\uc5d0 \ub300\ud574 \uc54c\uc544\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \uc77c\ubc18\uc801\uc73c\ub85c \ud074\ub77c\uc774\uc5b8\ud2b8\ub294 REST API\ub97c \ud1b5\ud574 \uc11c\ubc84\uc640 \uc0c1\ud638\uc791\uc6a9\ud569\ub2c8\ub2e4. \uc77c\ubc18\uc801\uc778 \uc694\uccad \ubc29\ubc95\uc740 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4:<\/p>\n
\n- GET:<\/strong> \ub370\uc774\ud130 \uc870\ud68c<\/li>\n
- POST:<\/strong> \ub370\uc774\ud130 \uc0dd\uc131<\/li>\n
- PUT:<\/strong> \ub370\uc774\ud130 \uc218\uc815<\/li>\n
- DELETE:<\/strong> \ub370\uc774\ud130 \uc0ad\uc81c<\/li>\n<\/ul>\n<\/section>\n\n
10. \ud074\ub77c\uc774\uc5b8\ud2b8 \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uad6c\ud604<\/h2>\n
\uc11c\ubc84 \ucabd\uc5d0\uc11c API\uac00 \uc131\uacf5\uc801\uc73c\ub85c \uad6c\ud604\ub418\uc5c8\uc73c\ub2c8, \uc774\uc81c \ud074\ub77c\uc774\uc5b8\ud2b8 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \ub9cc\ub4e4\uc5b4\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \uc5ec\uae30\uc11c\ub294 \uac04\ub2e8\ud55c HTML\uacfc JavaScript \uae30\ubc18\uc758 \ud504\ub860\ud2b8\uc5d4\ub4dc\ub97c \ub9cc\ub4e4\uc5b4 REST API\uc640 \ud1b5\uc2e0\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4. <\/p>\n