Servlet게시판6: 글 삭제하기

💡 핵심 요약 (TL;DR)

Servlet게시판6: 글 삭제하기의 동작 원리를 이해하고 실제 프로젝트에 적용하기 위한 실무 가이드다. 핵심 설정과 구현 코드를 단계별로 파악하여 상황에 맞게 유연하게 활용할 수 있다.

BoardFrontController.java의 doProcess()의 주소비교 후 처리부분에 코드 추가

	//글삭제
}else if(command.equals("/BoardDelete.bo")){
	System.out.println("C : /BoardDelete.bo 호출");
	System.out.println("C : .jsp -> .bo");
	//페이지이동
	forward =  new ActionForward();
	forward.setPath("./board/deleteForm.jsp");
	forward.setRedirect(false);
}else if(command.equals("/BoardDeleteAction.bo")){
	System.out.println("C : /BoardDeleteAction.bo 호출");
	action = new BoardDeleteAction();
	try{ forward = action.execute(request, response);
	}catch(Exception e){e.printStackTrace(); }
}

BoardDeleteAction.java 생성

public class BoardDeleteAction implements Action{

	@Override
	public ActionForward execute(HttpServletRequest request, HttpServletResponse response) throws Exception {
		System.out.println("M : BoardListAction_execute() 호출");
		
		//전달정보 저장
		int bno = Integer.parseInt(request.getParameter("bno"));
		String pageNum = request.getParameter("pageNum");
		String pw = request.getParameter("pw");
		
		//BoardDAO객체생성 deleteBoard
		BoardDAO bdao = new BoardDAO();
		int result = bdao.deleteBoard(bno, pw);
		System.out.println("M: DB처리완료 ->"+result);
		
		//처리결과를 js사용하여 페이지 이동
		//인코딩
		response.setContentType("text/html; charset=UTF-8");
		//출력통로생성
		PrintWriter out = response.getWriter();
		if(result == 0){
			out.print("<script>");
			out.print(" alert('비밀번호 오류');");
			out.print(" history.back();");
			out.print("</script>");
		    out.close();
		    
		    return null;			
		}else if(result == -1){
			out.print("<script>");
			out.print(" alert('해당 글 없음');");
			out.print(" history.back();");
			out.print("</script>");
		    out.close();
		    
		    return null;
		}
		
		//result == 1인경우
		out.print("<script>");
		out.print(" alert('글 삭제완료');");
		out.print(" location.href='./BoardList.bo?pageNum="+pageNum+"';");
		out.print("</script>");
	    out.close();
		
		return null;
	}
	
}

BoardDAO.java에 deleteBoard()메서드 작성

//글삭제구현
public int deleteBoard(int bno, String pw) {
	int result = -1;
	try{
		getCon();
		// sql (select)
		sql = "select pw from itwill_board where bno=?";
		pstmt = con.prepareStatement(sql);
		pstmt.setInt(1, bno);
		rs = pstmt.executeQuery();
		if(rs.next()){
			if(pw.equals(rs.getString("pw"))){
				sql = "delete from itwill_board where bno=?";
				pstmt = con.prepareStatement(sql);
				pstmt.setInt(1, bno);
				pstmt.executeUpdate();
				result = 1;
				System.out.println("글삭제 성공: "+result);
			}else{
				result = 0;
				System.out.println("글삭제 중 비번불일치: "+result);
			}
		}else{
			result = -1;
			System.out.println("글삭제 중 select오류"+result);
		}
	}catch(Exception e){
		e.printStackTrace();
	}finally{
		closeDB();
	}
	return result;
}//end of deleteBoard()

deleteForm.jsp 생성

<%
//1. 한글처리
request.setCharacterEncoding("UTF-8");

//2. 파라미터저장
int bno = Integer.parseInt(request.getParameter("bno"));
String pageNum = request.getParameter("pageNum");

%>
<fieldset>
	<legend>게시글 삭제</legend>
	<form action="./BoardDeleteAction.bo?pageNum=<%=pageNum %>" method="post">
		<input type="hidden" name="bno" value="<%=bno%>">
		비밀번호 : <input type="password" name="pw"><br>
		<input type="submit" value="글삭제하기" class="btn">
		<input type="button" value="뒤로가기" class="btn" onclick="history.back()">
	</form>
</fieldset>

#TILITWILL(JAVA)