jspblog : board keyword search

jspblog/src/main/java/com/example/jspblog/domain/board/BoardDao.java

@@ -90,6 +90,28 @@ public class BoardDao {
         return -1;
     }
 
+    public int count(String keword) {
+        String sql = "select count(*) from board where title like ?";
+
+        Connection conn = DB.getConnection();
+        PreparedStatement pstmt = null;
+        ResultSet rs = null;
+
+        if (conn != null) {
+            try {
+                pstmt = conn.prepareStatement(sql);
+                pstmt.setString(1, "%" + keword + "%");
+                rs = pstmt.executeQuery();
+                if (rs.next()) return rs.getInt(1);
+            } catch (Exception e) {
+                e.printStackTrace();
+            } finally {
+                DB.close(conn, pstmt, rs);
+            }
+        }
+        return -1;
+    }
+
     public DetailResDto findById(int id) {
         String sql = "select b.*, u.username from board b left outer join user u on b.userId = u.id where b.id = ?";
         Connection conn = DB.getConnection();
@@ -182,4 +204,38 @@ public class BoardDao {
         }
         return -1;
     }
+
+    public List<Board> findByKeyword(String keyword, int page) {
+        String sql = "select * from board where title like ? order by id desc limit ?, 4";
+        Connection conn = DB.getConnection();
+        PreparedStatement pstmt = null;
+        ResultSet rs = null;
+        List<Board> boards = new ArrayList<>();
+
+        if (conn != null) {
+            try {
+                pstmt = conn.prepareStatement(sql);
+                pstmt.setString(1, "%" + keyword + "%");
+                pstmt.setInt(2, page * 4);
+                rs = pstmt.executeQuery();
+                while (rs.next()) {
+                    Board board = Board.builder()
+                            .id(rs.getInt("id"))
+                            .title(rs.getString("title"))
+                            .content(rs.getString("content"))
+                            .readCount(rs.getInt("readCount"))
+                            .userId(rs.getInt("userId"))
+                            .createDate(rs.getTimestamp("createDate"))
+                            .build();
+                    boards.add(board);
+                }
+                return boards;
+            } catch (Exception e) {
+                e.printStackTrace();
+            } finally {
+                DB.close(conn, pstmt, rs);
+            }
+        }
+        return null;
+    }
 }

jspblog/src/main/java/com/example/jspblog/service/BoardService.java

@@ -27,6 +27,9 @@ public class BoardService {
     public int 글개수() {
         return boardDao.count();
     }
+    public int 글개수(String keword) {
+        return boardDao.count(keword);
+    }
 
     public DetailResDto 글상세보기(int id) {
         int result = boardDao.updateReadCount(id);
@@ -40,4 +43,8 @@ public class BoardService {
     public int 글수정(UpdateReqDto dto) {
         return boardDao.update(dto);
     }
+
+    public List<Board> 글검색(String keyword, int page) {
+        return boardDao.findByKeyword(keyword, page);
+    }
 }

jspblog/src/main/java/com/example/jspblog/web/BoardController.java

@@ -130,6 +130,20 @@ public class BoardController extends HttpServlet {
                     Script.back(response, "글 수정 실패");
                 }
             }
+            case "search" : {
+                String keyword = request.getParameter("keyword");
+                int page = Integer.parseInt(request.getParameter("page"));
+
+                List<Board> boards = boardService.글검색(keyword, page);
+                int boardCount = boardService.글개수(keyword);
+                int lastPage = (boardCount - 1) / 4;
+                double currentPosition = (double) page / lastPage * 100;
+                request.setAttribute("boards", boards);
+                request.setAttribute("lastPage", lastPage);
+                request.setAttribute("currentPosition", currentPosition);
+                request.getRequestDispatcher("board/list.jsp").forward(request, response);
+                break;
+            }
         }
     }
 }

jspblog/src/main/webapp/board/list.jsp

@@ -8,8 +8,7 @@
         <form class="form-inline d-flex justify-content-end" action="${pageContext.request.contextPath}/board">
             <input type="hidden" name="cmd" value="search" />
             <input type="hidden" name="page" value="0" />
-
-            <input type="text" name="keyword" class="form-control mr-sm-2" placeholder="Search">
+            <input type="text" name="keyword" class="form-control mr-sm-2" placeholder="Search" />
             <button class="btn btn-primary m-1">검색</button>
 
         </form>
@@ -29,12 +28,23 @@
     </c:forEach>
     <br />
     <ul class="pagination justify-content-center">
+        <c:choose>
+            <c:when test="${empty param.keyword}">
+                <c:set var="pagePrev" value="${pageContext.request.contextPath}/board?cmd=list&page=${param.page-1}" />
+                <c:set var="pageNext" value="${pageContext.request.contextPath}/board?cmd=list&page=${param.page+1}" />
+            </c:when>
+            <c:otherwise>
+                <c:set var="pagePrev" value="/jspblog/board?cmd=search&page=${param.page-1}&keyword=${param.keyword}" />
+                <c:set var="pageNext" value="/jspblog/board?cmd=search&page=${param.page+1}&keyword=${param.keyword}" />
+            </c:otherwise>
+        </c:choose>
+
         <c:choose>
             <c:when test="${param.page le 0}">
                 <li class="page-item disabled"><a class="page-link" href="#">Previous</a></li>
             </c:when>
             <c:otherwise>
-                <li class="page-item"><a class="page-link" href="${pageContext.request.contextPath}/board?cmd=list&page=${param.page-1}">Previous</a></li>
+                <li class="page-item"><a class="page-link" href="${pageScope.pagePrev}">Previous</a></li>
             </c:otherwise>
         </c:choose>
         <c:choose>
@@ -42,7 +52,7 @@
                 <li class="page-item disabled"><a class="page-link" href="#">Next</a></li>
             </c:when>
             <c:otherwise>
-                <li class="page-item"><a class="page-link" href="${pageContext.request.contextPath}/board?cmd=list&page=${param.page+1}">Next</a></li>
+                <li class="page-item"><a class="page-link" href="${pageScope.pageNext}">Next</a></li>
             </c:otherwise>
         </c:choose>