0

  • controller

    @Controller
public class BoardController {
     @Autowired
     private BoardServiceimpl boardService;

     @GetMapping("/")
     public String registerForm(Board board,Model model) throws Exception{
         List<Board> boardlist = boardService.listboard(board);

         model.addAttribute("boardlist",boardlist);
         return "register";

     }
     @PostMapping("/register")
     public String register(Board board,Model model) throws Exception{
         boardService.insertboard(board);

         List<Board> boardlist = boardService.listboard(board);
         model.addAttribute("boardlist",boardlist);
         return "register";

     }
     @RequestMapping(value="/writer")
     public String writerForm(Board board) throws Exception{


         return "writer";
     }
     @GetMapping("/delete")
     public void deleteForm(Long boardNo, HttpServletRequest request) throws Exception{
         System.out.println(boardNo);
          boardService.deleteboard(boardNo);
          System.out.println(boardNo);

     }

    }

  • Service

     @Service
  public class BoardServiceimpl {
      @Autowired
      private BoardRepository boardRepository;

      public List listboard(Board board) throws Exception{
          List<Board> boardlist = boardRepository.findAll();
          return boardlist;
      }

      public void  insertboard(Board board) throws Exception{
          boardRepository.save(board);

      }
      @Transactional
      public void deleteboard(Long boardNo) throws Exception{
          boardRepository.deleteById(boardNo);
      }
  }

-board

@Getter
@Setter
@EqualsAndHashCode(of="boardNo")
@ToString
@Entity
@Table(name="board")


 public class Board {
            
            @Id
            @GeneratedValue(strategy=GenerationType.IDENTITY)
            private Long boardNo;
            @Column(length=300)
            @NonNull
            private String title;
            @Column(length=300)
            @NonNull
            private String writer;
            @Column(length=500)
            @NonNull
            private String content;
            
            private LocalDateTime regDate;
    }

  • html

     <html xmlns:th = "http://www.thymeleaf.org">
 <head>
 <meta charset="utf-8">
 <title>Board</title>
 <script src = "/js/jQuery-3.6.0.min.js"></script>
 <script>

      $(document).ready(function(){
          var objform = $("#inner");
             console.log(objform);
          $("#remove").on("click",function(){
         objform.attr("action","/delete");
         objform.submit();
      });
     });``

 </script>
 </head>
 <body>
 <form id = "inner" th:object="${board}" action="/delete">
 <input type ="hidden" name="boardNo" th:field="*{boardNo}" />
 <table align="center" border="1" width="80%">

 <tr height="10" align="center" bgcolor="skyblue">
     <th width="30">글번호</th>
     <th width="70">작성자</th>
     <th width="150">제목</th>
     <th width="200">내용</th>
     <th width="100">작성일</th> 
     <th width="50">삭제</th>
     </tr>
     <tr align ="center" th:each="board : ${boardlist}">
         <td  th:text="${board.boardNo}"></td>
         <td th:text="${board.writer}"></td>
         <td th:text="${board.content}"></td>
         <td th:text="${board.title}"></td>
         <td th:text="${board.regDate}"></td>

         <td><button type="submit" id="remove">삭제</button></td>

         </tr>
 </table>
 </form>


     <a href = "writer.html" th:href="@{writer}">글쓰기</a>
 </body>
 </html>

Caused by: java.lang.IllegalArgumentException: The given id must not be null! at org.springframework.util.Assert.notNull(Assert.java:201) at org.springframework.data.jpa.repository.support.SimpleJpaRepository.deleteById(SimpleJpaRepository.java:166) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:568) at org.springframework.data.repository.core.support.RepositoryMethodInvoker$RepositoryFragmentMethodInvoker.lambda$new$0(RepositoryMethodInvoker.java:289) at org.springframework.data.repository.core.support.RepositoryMethodInvoker.doInvoke(RepositoryMethodInvoker.java:137) at org.springframework.data.repository.core.support.RepositoryMethodInvoker.invoke(RepositoryMethodInvoker.java:121) at org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:529) at org.springframework.data.repository.core.support.RepositoryComposition.invoke(RepositoryComposition.java:285) at org.springframework.data.repository.core.support.RepositoryFactorySupport$ImplementationMethodExecutionInterceptor.invoke(RepositoryFactorySupport.java:639) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.doInvoke(QueryExecutorMethodInterceptor.java:163) at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.invoke(QueryExecutorMethodInterceptor.java:138) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:80) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:123) at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:388) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:137) ... 71 more

I don't know why it doesn't pass when I go through the html(Form).

Mohammad Javad
  • 74
  • 5
mincheol
  • 1

1 Answers1

0

There is some structural problems in your html. You are iterating for boardList but you are not using one of the boardList objects as parameter during deleting object. Also, you do not need to have onClick function. You can trigger your Controller method by <a th:href> .

You should have this kind of form structure.

HTML:

<tr align ="center" th:each="board : ${boardlist}">
    <td  th:text="${board.boardNo}"></td>
    <td th:text="${board.writer}"></td>
    <td th:text="${board.content}"></td>
    <td th:text="${board.title}"></td>
    <td th:text="${board.regDate}"></td>

    <td><a th:href="@{/delete/{boardNo}(id=${board.boardNo})}"</a></td>

</tr>

CONTROLLER:

    @GetMapping("/delete/{boardNo}")
    public void deleteForm(@PathVariable(value = "boardNo") Long boardNo, Model model) throws Exception{
        System.out.println(boardNo);
         boardService.deleteboard(boardNo);
         System.out.println(boardNo);
    
    }

You should look at this discussion - How to delete objects on a Thymeleaf th:each iteration passing an ID to the controller?

Alper Derya
  • 237
  • 1
  • 9