[21.1.22]Interceptor利用

受信者の設定

Handler Interceptor Adapterを継承するクラスの作成

1. preHandle(request, response, handler)

@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
		throws Exception {
	logger.info("===== preHandle 호출");
	return super.preHandle(request, response, handler);
}

2. postHandle(request, response, handler, ModelAndView)

@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
		ModelAndView modelAndView) throws Exception {
	logger.info("===== postHandle 호출");
	super.postHandle(request, response, handler, modelAndView);
}

3. aftetCompletion(request, response, handler, ex)

@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
		throws Exception {
	logger.info("===== afterCompletion 호출");
	super.afterCompletion(request, response, handler, ex);
}

servlet-context.beanからxmlへのurlマッピングの設定

<beans:bean id="sample1" class="edu.spring.ex04.interceptor.SampleInterceptor1">
</beans:bean>

<interceptors>
	<interceptor>
		<mapping path="/" />
		<beans:ref bean="sample1" />
	</interceptor>
</interceptors>

ブロッキングの使用例

@GetMapping("/test1")
public String test1() {
	logger.info("test1() 호출");
	return "test";
}
	
@GetMapping("/test2")
public String test2(Model model) {
	logger.info("test2() 호출");
	model.addAttribute("data", "test2");
	return "test";
}

@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
		throws Exception {
	logger.info("===== preHandle 호출");
	HandlerMethod handlerMethod=(HandlerMethod) handler;
	Method method=handlerMethod.getMethod();
		
	//url 경로에 있는 bean 객체
	logger.info("Bean : "+handlerMethod.getBean());
	//url 경로에 있는 메소드 이름
	logger.info("method : "+method.getName());
		
	return true;
}

@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
		ModelAndView modelAndView) throws Exception {
	logger.info("===== postHandle 호출");
	String data=(String)modelAndView.getModel().get("data");
	logger.info("data : "+data);
		
	if(data==null) {
		HttpSession session=request.getSession();
		session.setAttribute("data", "DUMMY DATA");
	}
		
	super.postHandle(request, response, handler, modelAndView);
}

Interceptor-ログインセッションの確認

@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
		throws Exception {
	logger.info("===== preHandle 호출");
	HttpSession session=request.getSession();
	String userid=(String)session.getAttribute("userid");
		
	if(userid!=null) {
		logger.info("로그인 상태 -> controller method 실행");
		return true;
	} else {
		logger.info("로그아웃 상태 -> controller method 실행 안됨");
			
		//전체 요청 주소에서 쿼리 스트링을 제외한 부분
		String uri=request.getRequestURI();
		logger.info("요청 uri : "+uri);
		String contextRoot=request.getContextPath();
		logger.info("contextRoot : "+contextRoot);
		uri=uri.replace(contextRoot, "");
		
		//전체 요청 주소에서 쿼리 스트링만 추출
		String queryString=request.getQueryString();
		logger.info("쿼리 스트링 : "+queryString);
		
		String targetURL="";
		if(queryString==null) {
			targetURL=uri;
		}else {
			targetURL=uri+"?"+queryString;
		}
		request.getSession().setAttribute("targetURL", targetURL);
		
        	response.sendRedirect("/ex04/member/login");
		return false;			
	}
}

	@PostMapping("/login")
	public String loginPost(String userid, String password, HttpServletRequest request) throws Exception{
		logger.info("loginPost() 호출");
		if(userid.equals("test") && password.equals("1234")) {
			logger.info("로그인 성공");
			HttpSession session=request.getSession();
			session.setAttribute("userid", userid);
			
			//세션에서 targetURL 가져오기
			String targetURL=(String)session.getAttribute("targetURL");
			logger.info("목표 url : "+targetURL);
			if(targetURL!=null) {
				session.removeAttribute("targetURL");
				return "redirect:"+targetURL;
			}else {
				return "redirect:/board/list";				
			}
			
		}else {
			logger.info("로그인 실패");
			return "redirect:/member/login";
		}
	}

imgScalr-画像サムネイル

pom.xmlライブラリの追加

<dependency>
	<groupId>org.imgscalr</groupId>
	<artifactId>imgscalr-lib</artifactId>
	<version>4.2</version>
</dependency>

<dependency>
	<groupId>commons-fileupload</groupId>
	<artifactId>commons-fileupload</artifactId>
	<version>1.3.3</version>
</dependency>

servlet-context.xmlパスの追加

<beans:bean id="uploadPath" class="java.lang.String">
	<beans:constructor-arg value="C:\\Study\\FileUploadTest">
	</beans:constructor-arg>
</beans:bean>

<beans:bean id="multipartResolver" 
	class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
	<beans:property name="maxUploadSize" value="10485760"></beans:property>
</beans:bean>

個々のファイルをアップロード

<view.jsp>

<form action="upload" method="post" enctype="multipart/form-data">
	<input type="file" name="file"><br>
	<input type="submit" value="업로드">
</form>

<controller.java>

@Resource(name ="uploadPath")
private String uploadPath;

@PostMapping("/upload")
public void uploadPost(MultipartFile file, Model model) {
	logger.info("uploadPost() 호출");
	logger.info("파일 이름 : "+file.getOriginalFilename());
	logger.info("파일 크기 : "+file.getSize());
		
	String savedFile=saveUploadFile(file);
	logger.info("저장된 파일 이름 : "+savedFile);		
}

private String saveUploadFile(MultipartFile file) {	
	UUID uuid=UUID.randomUUID();
	String savedName=uuid+"_"+file.getOriginalFilename();
	File target=new File(uploadPath, savedName);
		
	try {
		FileCopyUtils.copy(file.getBytes(), target);
		logger.info("파일 저장 성공");
		return savedName;
	} catch (IOException e) {
		logger.error("파일 저장 실패");
		return null;			
	}
}

複数のファイルをアップロード

<view.jsp>

<form action="upload2" method="post" enctype="multipart/form-data">
	<input type="file" name="files" multiple><br>
	<input type="submit" value="업로드">
</form>

<Controller.java>

@PostMapping("/upload2")
public String uploadPost2(MultipartFile[] files, Model model) {
	String result="";
	for (MultipartFile f : files) {
		result += saveUploadFile(f)+" ";
	}
	logger.info("result = "+result);
	return "upload";
}