Spring Chapter9~Chapter10[16-2]

파일 업로드 처리

파일 업로드 

파일 업로드

1.pom.xml파일에 의존 라이브러리 등록하기

2.servlet-context.xml 파일에 시큐리티 필터 등록하기

파일 업로드를 위한 웹 페이지

MultipartFile을 사용한 파일 업로드

MultipartFile 인터페이스

파일 업로드 유형

1.@RequestParam 이용하기

2.MultipartHttpServletRequest 인터페이스 사용하기

3.@ModelAttribute 이용하기

---

리소스를 이용한 도서 이미지 출력하기.

servlet-context.xml

<resources mapping="/resources/**" location="/resources"/>

books.jsp

	<div class="container">
		<div class="row" align="center">
			<c:forEach items="${bookList}" var="book">
				<div class="col-md-4">
	               <c:choose>
	                  <c:when test="${book.getBookImage() == null}">
	                     <img src="<c:url value="/resources/images/${book.bookId}.png"/>" style="width:60%"/>
	                  </c:when>
	                  <c:otherwise>
	                     <img src="<c:url value='/resources/images/${book.getBookImage().getOriginalFilename()}'/>" style="width: 60%"/>
	                  </c:otherwise>
	               </c:choose>
					<h3>${book.name}</h3>
					<p>${book.author}
						<br>${book.publisher} | ${book.releaseDate}
					<p align="left">${fn:substring(book.description, 0, 100)}...
					<p>${book.unitPrice}원
					<p><a href="<c:url value="/books/book?id=${book.bookId}"/>"class="btn btn-secondary" role="button">상세정보 &raquo;</a><!-- 코드 추가됨 -->
				</div>
			</c:forEach>
		</div>

book.jsp

            <c:choose>
	            <c:when test="${book.getBookImage()==null }">
                  <img src="<c:url value="/resources/images/${book.getBookId() }.png"/>"style="width:100%"/>
                  
	            </c:when>
	            <c:otherwise>
            		<img src="<c:url value="/resources/images/${book.getBookImage().getOriginalFilename()}"/>"style="width:100%"/>
	            </c:otherwise>
	         </c:choose>

---

---

도서 이미지 파일 업로드하기

pom.xml

 <properties>
      <commons-fileupload-version>1.4</commons-fileupload-version>
      <commons-io-version>2.11.0</commons-io-version>
  </properties>
  
   <!-- File Upload -->
      <dependency>
       <groupId>commons-fileupload</groupId>
         <artifactId>commons-fileupload</artifactId>
         <version>${commons-fileupload-version}</version>
      </dependency>
     <dependency>
       <groupId>commons-io</groupId>
         <artifactId>commons-io</artifactId>
         <version>${commons-io-version}</version>
      </dependency>

servlet-context.xml

 <beans:bean id="multipartResolver"
   			class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
   	<beans:property name="maxUploadSize" value="10240000"/>
   </beans:bean>

Book.java

private MultipartFile bookImage;
	
	public MultipartFile getBookImage() {
		return bookImage;
	}

	public void setBookImage(MultipartFile bookImage) {
		this.bookImage = bookImage;
	}

BookController.java

//	@PostMapping("/add")
//	public String submitAddNewBook(@ModelAttribute("NewBook") Book book)
//	{
//		bookService.setNewBook(book);
//		return "redirect:/books";
//	}

//	chap9 fileupload 
	@PostMapping("/add")
	public String submitAddNewBook(@ModelAttribute("NewBook") Book book, HttpServletRequest request) 
	{
		MultipartFile bookImage = book.getBookImage();
		
		String saveName = bookImage.getOriginalFilename();
		String save = request.getSession().getServletContext().getRealPath("/resources/images");
		File saveFile = new File(save, saveName);
		
		
		if(bookImage !=null && !bookImage.isEmpty())
			try {
				bookImage.transferTo(saveFile);
			}
			catch(Exception e)
			{
				throw new RuntimeException("도서 이미지 업로드가 실패하였습니다.", e);
			}
		
		bookService.setNewBook(book);
		return "redirect:/books";
	}
    
    
    @InitBinder
	public void initBinder(WebDataBinder binder)
	{
		binder.setAllowedFields("bookId", "name", "unitPrice", "author",
				"decription", "publisher", "category", "unitsInStock",
				"totalPages", "releaseDate", "condition", "bookImage");//bookImage추가
	}

addBook.jsp

<form:form modelAttribute="NewBook"
		action="./add?${_csrf.parameterName}=${_csrf.token}" class="form-horizontal"
		enctype="multipart/form-data">



....

	<div class="form-group row">
				<label class="col-sm-2 control-label">도서 이미지</label>			
				<div class="col-sm-7">
					<form:input path="bookImage" type="file" class="form-contorl" />
				</div>
			</div>

---

 

예외 처리 

예외 처리

예외처리

예외 처리 방법의 종류

@ResponseStatus를 이용한 HTTP 상태 코드 기반 예외 처리

HTTP 상태 코드

@ResponseStatus를 이용한 예외 처리

---

@ResponseStatus를 이용한 예외 처리

CategoryException.java

package com.springmvc.exception;

import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.ResponseStatus;

@SuppressWarnings("serial")
@ResponseStatus(value=HttpStatus.NOT_FOUND, reason="요청한 도서 분야를 찾을 수 없습니다.")
public class CategoryException extends RuntimeException {

}

BookController.java

	@GetMapping("/{category}")
	public String requestBookByCategory(@PathVariable("category") String bookCategory, Model model)
	{
		List<Book> booksByCategory = bookService.getBookListByCategory(bookCategory);
		
        //if문 추가
		if(booksByCategory == null || booksByCategory.isEmpty())
		{
			throw new CategoryException();
		}
		
		model.addAttribute("bookList", booksByCategory);
		return	"books";
	}

---

@ExceptionHandler를 이용한 컨트롤러 기반 예외 처리

@ExceptionHandler를 이용한 예외 처리

---

@ExceptionHandler를 이용한 예외 처리하기

BookIdException.java

package com.springmvc.exception;

@SuppressWarnings("serial")
public class BookIdException extends RuntimeException
{
	private String bookId;
	
	public BookIdException(String bookId)
	{
		this.bookId = bookId;
	}
	
	public String getBookId()
	{
		return bookId;
	}
}

BookRepositoryImpl.java

public Book getBookById(String bookId) {
		// TODO Auto-generated method stub
		Book bookInfo = null;
		for(int i = 0; i<listOfBooks.size(); i++)
		{
			Book book = listOfBooks.get(i);
			if(book != null && book.getBookId() != null && book.getBookId().equals(bookId))
			{
				bookInfo = book;
				break;
			}
		}
	
//		예외 처리 추가
		if(bookInfo == null)
			throw new BookIdException(bookId);
		return bookInfo;
	}

BookController.java

@ExceptionHandler(value= {BookIdException.class})
	public ModelAndView handleError(HttpServletRequest req, BookIdException exception)
	{
		ModelAndView mav = new ModelAndView();
		mav.addObject("invalidBookId", exception.getBookId());
		mav.addObject("exception", exception);
		mav.addObject("url", req.getRequestURL() + "?" + req.getQueryString());
		mav.setViewName("errorBook");
		return mav;
	}

errorBook.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"  %>
<!DOCTYPE html>
<html>
<head>
<link href="<c:url value="/resources/css/bootstrap.min.css"/>" rel="stylesheet">
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<nav class="navbar navbar-expand navbar-dark bg-dark">
      <div class="container">
         <div class="navbar-header">
            <a class="navbar-brand" href="../home">Home</a>
         </div>
      </div>
   </nav>
   <div class="jumbotron">
      <div class="container">            
         <h2 class="alert alert-danger">해당 도서가 존재하지 않습니다.<br>
            도서ID : ${invalidBookId}
         </h2>
      </div>
   </div>
   <div class="container">
      <p>${url}</p>
      <p>${exception}</p>
   </div>
   <div class="container">
      <p>
         <a href="<c:url value='/books'/>" class="btn btn-secondary">도서목록 &raquo;</a>
      </p>
   </div>
</body>
</html>

---

@ControllerAdvice를 이용한 전역 예외 처리

전역 예외 처리를 위한 @ControllerAdvice

---

@ControllerAdvice를 이용하여 예외 처리하기

CommonException.java

package com.springmvc.exception;

import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.servlet.ModelAndView;

@ControllerAdvice
public class CommonException {

	@ExceptionHandler(RuntimeException.class)
	private ModelAndView handleErrorCommon(Exception e)
	{
		ModelAndView modelAndView = new ModelAndView();
		modelAndView.addObject("exception", e);
		modelAndView.setViewName("errorCommon");
		return modelAndView;
	}
}

errorCommon.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
      <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<link href="<c:url value="/resources/css/bootstrap.min.css"/>" rel="stylesheet">
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<nav class="navbar navbar-expand navbar-dark bg-dark">
		<div class="container">
			<div class="navbar-header">
				<a class="navbar-brand" href="./home">Home</a>
			</div>
		</div>
	</nav>
	<div class="jumbotron">
		<div class="container">				
			<h1 class="alert alert-danger">요청한 도서가 존재하지 않습니다.</h1>
		</div>
	</div>
	<div class="container">
		<p>${exception }</p>
	</div>
	<div class="container">
		<p>
		<a href="<c:url value="/books" />"class="btn btn-secondary"> 도서목록 &raquo;</a>
	</div>
</body>
</html>