스프링 3.0 & restful
DESCRIPTION
2010 한국 자바 개발자 페스티벌 Track 1 Session 4 발표자료TRANSCRIPT
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스프링 3.0 & RESTful
백기선, 김성윤
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봄싹 즐겨찾기 서비스
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To Do
• 링크 등록
• 링크 목록 조회
• 링크 조회
• 링크 수정
• 링크 삭제
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즐겨찾기 서비스 URL
작업 URL Method
목록 조회 /link GET
추가 (폼) /link/form GET
추가 (폼 서브밋) /link POST
뷰 /link/1 GET
수정 (폼) /link/1/form GET
수정 (폼 서브밋) /link/1 PUT
삭제 /link/1 DELETE
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주요 기술 :: 스프링 3.0 @MVC
• @RequestMapping
• @PathVariable
• hiddenMethodFilter
• 스프링 form 태그
• ContentsNegotiatingViewResolver
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@RequestMapping
• DefaultAnnotationHandlerMapping이@RequestMapping 정보를 참조해서 핸들러 찾아줌.
@RequestMapping(value = ”/link/{id}", method = RequestMethod.DELETE)public String delete(@PathVariable int id){
postService.delete(id);return ”/link";
}
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@PathVariable
• /link/1 => /link/{id}
• 기본값 설정 가능
@RequestMapping(value = "/link/{id}", method = RequestMethod.GET)public String view(@PathVariable int id, Model model){
model.addAttribute(”link", linkService.get(id));return ”link/view";
}
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hiddenMethodFilter
• 기본값: _method
<filter><filter-name>httpMethodFilter</filter-name><filter-
class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class></filter>
<filter-mapping><filter-name>httpMethodFilter</filter-name><url-pattern>/*</url-pattern>
</filter-mapping>
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스프링 form 태그
• form 태그 사용하면 PUT, DELETE 사용시자동으로 히든 파라미터로 값 넘겨줌.
<form:form commandName=”link" action=”/link/${link.id}" method="PUT">
<form:form action=”/link/${link.id}" method="DELETE">
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
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ContentsNegotiatingViewResolver이게 없다면…
if ("xml".equals(req.getParameter("type"))) { return new ModelAndView(helloMarshallingView, model);
} else { return new ModelAndView("/WEB-INF/view/hello.jsp", model);
}
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ContentsNegotiatingViewResolver이게 있다면?
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ContentsNegotiatingViewResolver동작 방식
1. 미디어 타입 결정
2. 뷰 후보 선정
3. 최종 뷰 결정
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1. 미디어 타입 결정
1. URL 확장자로 결정– /book.json
2. 요청 파라미터로 결정– /book?format=json
3. Access 헤더 정보로 결정
4. defaultContentType 속성 값 사용.
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2. 뷰 후보 선정
1. viewResolvers 미사용시: 서블릿 콘텍스트에 등록된 모든 ViewResolver 사용해서뷰 후보 선정
2. viewResolvers 사용시: 모든 뷰 리졸버가돌려주는 뷰를 후보 목록에 추가
3. defaultView 속성에 설정한 뷰는 무조건후보 목록에 추가
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3. 최종 뷰 결정
• 미디어 타입과 뷰 목록 비교해서 뷰 결정
– 뷰의 contents-type과 미디어 타입 비교
• 예제
– 미디어 타입은 JSON
– 뷰 후보: JSON 뷰, JSTL 뷰, XML 뷰
– 결과: JSON뷰 사용
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RestTemplate
• Spring 3.0 M2 추가됨.
• Spring’s Template series와 비슷한 형태
(JdbcTemplate, JmsTemplate ... )
• RESTful 스타일 URL 지원.
• HTTP access 단순화.
• 사용자 정의 콜백 및 결과 추출 클래스 지원.
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RestTemplate Hierarchy
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RestTemplate methods
HTTP method RestTemplate methods
GET getForObject(…)getForEntity(…)
POST postForLocation(…)postForObject(…)
PUT put(…)
DELETE delete(…)
HEAD headForHeaders(…)
OPTIONS optionForAllow(…)
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HttpRequests
SimpleClientHttpRequest( java.net. HttpURLConnection)
CommonsClientHttpRequest( jakarta Commons HttpClient)
사용자 정의 HttpRequest
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HttpMessageConverters
• application/octet-streamByteArray
• text/plainString
• resource file typeResource
• text/xml or application/xmlSource
• text/xml or application/xml XmlAwareForm
• text/xml or application/xml Jaxb2RootElement
• application/jsonMappingJackson
• application/atom+xmlAtomFeed
• application/rss+xmlRssChannel
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RestTemplate – 사용전
String uri = "http://example.com/hotels/1/bookings";
PostMethod post = new PostMethod(uri);
String request = // create booking request content
post.setRequestEntity(new StringRequestEntity(request));
httpClient.executeMethod(post);
if (HttpStatus.SC_CREATED == post.getStatusCode()) {
Header location = post.getRequestHeader("Location");
if (location != null) {
System.out.println(location.getValue());
}
}
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RestTemplate – 사용후
String uri = "http://example.com/hotels/{id}/bookings";
RestOperations restTemplate = new RestTemplate();
Booking booking = // create booking object
URI location = restTemplate.postForLocation(uri, booking, “1”);
System.out.println(location);
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Authentication
Basic Authentication
• CommonsClientHttpRequest
Open Authorization(OAuth)
• 미지원 (3.1M1 Fix 예정)
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RestTemplate @ Twitter RESTful