- 1)AJAX -- 페이지 리로드방식 JSON 미사용
CREATE TABLE `bottomcontext` (
`count` INT(11) NOT NULL AUTO_INCREMENT,
`num` INT(11) NOT NULL,
`bottomcontent` VARCHAR(50) NOT NULL COLLATE 'utf8mb4_general_ci',
`writer` VARCHAR(50) NULL DEFAULT NULL COLLATE 'utf8mb4_general_ci',
INDEX `num` (`num`) USING BTREE,
INDEX `count` (`count`) USING BTREE,
CONSTRAINT `FK_bottomcontext_context` FOREIGN KEY (`num`) REFERENCES `mydb`.`context` (`num`) ON UPDATE NO ACTION ON DELETE NO ACTION
)
CREATE TABLE `context` (
`num` INT(11) NOT NULL,
`title` VARCHAR(50) NOT NULL DEFAULT '' COLLATE 'utf8mb4_general_ci',
`content` VARCHAR(50) NOT NULL DEFAULT '' COLLATE 'utf8mb4_general_ci',
`writer` VARCHAR(50) NOT NULL DEFAULT '' COLLATE 'utf8mb4_general_ci',
`bottomwrite` VARCHAR(50) NOT NULL DEFAULT '' COLLATE 'utf8mb4_general_ci',
PRIMARY KEY (`num`) USING BTREE
)
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>댓글보기</title>
<script>
window.onload = function() {
const trs = document.querySelector("table");
trs.addEventListener("click", c);
function c() {
if(event.target.className =="tbl") {
location.href="detailServlet?num="+event.target.innerHTML;
}else {
return;
}
}
}
</script>
</head>
<body>
<h1>게시판1</h1>
<hr>
<table>
<tr>
<th>번호</th>
<th>제목</th>
<th>내용</th>
<th>작성자</th>
</tr>
<c:forEach var="con" items="${list }">
<tr>
<td class="tbl">${con.num }</td>
<td>${con.title }</td>
<td>${con.content }</td>
<td>${con.writer }</td>
</tr>
</c:forEach>
</table>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script>
window.onload = function() {
const txts= document.querySelector("input[name=txt]");
const writers= document.querySelector("input[name=writer]");
const smtBtn = document.querySelector("#smt");
smtBtn.addEventListener("click", function e() {
const xhttp = new XMLHttpRequest();
xhttp.onreadystatechange =function() {
if(xhttp.readyState ===4 && xhttp.status ===200) {
alert("등록완료");
location.href="detailServlet?num="+${cv.num};
}
}
xhttp.open("GET","insertServlet?number="+${cv.num}+"&content="+txts.value +"&writer="+writers.value, true);
xhttp.send();
})
}
</script>
</head>
<body>
<p>제목:${cv.title } 작성자: ${cv.writer }</p>
<p>내용</p>
<p>${cv.content }</p>
<hr>
<h1>댓글수:${list.size()}</h1>
<div style="border: 1px solid black;">
<p>댓글작성</p>
작성자:<input type="text" name="writer"><br>
내용:<input type="text" name="txt"><br>
<input id="smt" type="submit" value="댓글등록">
<br>
</div>
<table>
<tr>
<th>번호</th>
<th>작성자</th>
<th>댓글내용</th>
</tr>
<c:forEach var ="repeat" items="${list }">
<tr>
<td>${repeat.count }</td>
<td>${repeat.writer }</td>
<td>${repeat.bottomcontent }</td>
</tr>
</c:forEach>
</table>
</body>
</html>
package servlet;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import vo.DBcon;
@WebServlet("/insertServlet")
public class insertServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String number = request.getParameter("number");
int innum = Integer.parseInt(number);
String content = request.getParameter("content");
String writer =request.getParameter("writer");
try {
Connection conn = DBcon.getConnection();
String query ="SELECT MAX(COUNT)+1 FROM bottomcontext WHERE num=?";
PreparedStatement stmt = conn.prepareStatement(query);
stmt.setInt(1, innum);
ResultSet rs = stmt.executeQuery();
rs.next();
int maxnum = rs.getInt("MAX(COUNT)+1");
String query2 = "INSERT INTO bottomcontext VALUES (?,?,?,?)";
PreparedStatement stmt2 = conn.prepareStatement(query2);
stmt2.setInt(1, maxnum);
stmt2.setInt(2, innum);
stmt2.setString(3, content);
stmt2.setString(4, writer);
stmt2.executeUpdate();
} catch (Exception e) {
e.printStackTrace();
}
}
}
package vo;
import java.sql.Connection;
import java.sql.DriverManager;
public class DBcon {
public static Connection getConnection() throws Exception{
final String driver = "org.mariadb.jdbc.Driver";
Class.forName(driver);
final String url ="jdbc:mariadb://localhost:3306/mydb";
Connection conn = DriverManager.getConnection(url,"root","1234");
return conn;
}
}
package servlet;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import vo.BottomContentVo;
import vo.ContextVo;
import vo.DBcon;
@WebServlet("/detailServlet")
public class detailServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
Connection conn = DBcon.getConnection();
String query ="SELECT * FROM context where num=?";
PreparedStatement stmt = conn.prepareStatement(query);
String st = request.getParameter("num");
int nums = Integer.parseInt(st);
stmt.setInt(1, nums);
ResultSet rs = stmt.executeQuery();
rs.next();
int num = rs.getInt("num");
String title = rs.getString("title");
String content = rs.getString("content");
String writer = rs.getString("writer");
String bottomwrite = rs.getString("bottomwrite");
ContextVo cv = new ContextVo(num,title,content,writer,bottomwrite);
request.setAttribute("cv", cv);
/////////
String query2 = "SELECT * FROM bottomcontext where num=? ORDER BY COUNT desc";
PreparedStatement stmt2 =conn.prepareStatement(query2);
stmt2.setInt(1, nums);
ResultSet rs2 = stmt2.executeQuery();
ArrayList<BottomContentVo> ar = new ArrayList<>();
while(rs2.next()) {
int count = rs2.getInt("count");
int num2 = rs2.getInt("num");
String bottomcontent = rs2.getString("bottomcontent");
String writer2 = rs2.getString("writer");
BottomContentVo bcv = new BottomContentVo(count,num2,bottomcontent,writer2);
ar.add(bcv);
}
request.setAttribute("list", ar);
request.getRequestDispatcher("detail.jsp").forward(request, response);
} catch (Exception e) {
e.printStackTrace();
}
}
}
package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import vo.ContextVo;
import vo.DBcon;
@WebServlet("/contextServlet")
public class contextServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
ArrayList<ContextVo> ar = new ArrayList<>();
try {
Connection conn = DBcon.getConnection();
String query ="SELECT * FROM context";
PreparedStatement stmt = conn.prepareStatement(query);
ResultSet rs = stmt.executeQuery();
while(rs.next()) {
int num = rs.getInt("num");
String title = rs.getString("title");
String content = rs.getString("content");
String writer = rs.getString("writer");
String bottomwrite = rs.getString("bottomwrite");
ContextVo cv = new ContextVo(num,title,content,writer,bottomwrite);
ar.add(cv);
}
request.setAttribute("list", ar);
request.getRequestDispatcher("context.jsp").forward(request, response);
} catch (Exception e) {
e.printStackTrace();
}
}
}
package vo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class BottomContentVo {
int count;
int num;
String bottomcontent;
String writer;
}
package vo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class ContextVo {
int num;
String title;
String content;
String writer;
String bottomwriter;
}
package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import vo.ContextVo;
import vo.DBcon;
@WebServlet("/contextServlet")
public class contextServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
ArrayList<ContextVo> ar = new ArrayList<>();
try {
Connection conn = DBcon.getConnection();
String query ="SELECT * FROM context";
PreparedStatement stmt = conn.prepareStatement(query);
ResultSet rs = stmt.executeQuery();
while(rs.next()) {
int num = rs.getInt("num");
String title = rs.getString("title");
String content = rs.getString("content");
String writer = rs.getString("writer");
String bottomwrite = rs.getString("bottomwrite");
ContextVo cv = new ContextVo(num,title,content,writer,bottomwrite);
ar.add(cv);
}
request.setAttribute("list", ar);
request.getRequestDispatcher("context.jsp").forward(request, response);
} catch (Exception e) {
e.printStackTrace();
}
}
}
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>댓글보기</title>
<script>
window.onload = function() {
const trs = document.querySelector("table");
trs.addEventListener("click", c);
function c() {
if(event.target.className =="tbl") {
location.href="detailServlet?num="+event.target.innerHTML;
}else {
return;
}
}
}
</script>
</head>
<body>
<h1>게시판1</h1>
<hr>
<table>
<tr>
<th>번호</th>
<th>제목</th>
<th>내용</th>
<th>작성자</th>
</tr>
<c:forEach var="con" items="${list }">
<tr>
<td class="tbl">${con.num }</td>
<td>${con.title }</td>
<td>${con.content }</td>
<td>${con.writer }</td>
</tr>
</c:forEach>
</table>
</body>
</html>
package servlet;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import vo.BottomContentVo;
import vo.ContextVo;
import vo.DBcon;
@WebServlet("/detailServlet")
public class detailServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
Connection conn = DBcon.getConnection();
String query ="SELECT * FROM context where num=?";
PreparedStatement stmt = conn.prepareStatement(query);
String st = request.getParameter("num");
int nums = Integer.parseInt(st);
stmt.setInt(1, nums);
ResultSet rs = stmt.executeQuery();
rs.next();
int num = rs.getInt("num");
String title = rs.getString("title");
String content = rs.getString("content");
String writer = rs.getString("writer");
String bottomwrite = rs.getString("bottomwrite");
ContextVo cv = new ContextVo(num,title,content,writer,bottomwrite);
request.setAttribute("cv", cv);
/////////
String query2 = "SELECT * FROM bottomcontext where num=? ORDER BY COUNT desc";
PreparedStatement stmt2 =conn.prepareStatement(query2);
stmt2.setInt(1, nums);
ResultSet rs2 = stmt2.executeQuery();
ArrayList<BottomContentVo> ar = new ArrayList<>();
while(rs2.next()) {
int count = rs2.getInt("count");
int num2 = rs2.getInt("num");
String bottomcontent = rs2.getString("bottomcontent");
String writer2 = rs2.getString("writer");
BottomContentVo bcv = new BottomContentVo(count,num2,bottomcontent,writer2);
ar.add(bcv);
}
request.setAttribute("list", ar);
//JSON미사용 서버리로드
//request.getRequestDispatcher("detail.jsp").forward(request, response);
//JSON사용
request.getRequestDispatcher("detail2json.jsp").forward(request, response);
} catch (Exception e) {
e.printStackTrace();
}
}
}
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script>
window.onload = function() {
const txts= document.querySelector("input[name=txt]");
const writers= document.querySelector("input[name=writer]");
const smtBtn = document.querySelector("#smt");
let tables = document.querySelector("table");
let spans = document.querySelector("#spans");
smtBtn.addEventListener("click", function e() {
const xhttp = new XMLHttpRequest();
xhttp.onreadystatechange =function() {
if(xhttp.readyState ===4 && xhttp.status ===200) {
let getlist = JSON.parse(this.responseText);
spans.innerHTML = getlist.length;
tables.innerHTML =
'<tr>'+
'<th>번호</th>'+
'<th>작성자</th>'+
'<th>댓글내용</th>'+
'</tr>';
for(let i =0; i<getlist.length; i++) {
tables.innerHTML +=
'<tr>'+
'<td>'+getlist[i].count +'</td>'+
'<td>'+getlist[i].writer +'</td>'+
'<td>'+getlist[i].bottomcontent +'</td>'+
'</tr>';
}
}
}
xhttp.open("Post","insertServlet", true);
xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
const data = "number="+${cv.num}+"&content="+txts.value +"&writer="+writers.value;
xhttp.send(data);
})
}
</script>
</head>
<body>
<p>제목:${cv.title } 작성자: ${cv.writer }</p>
<p>내용</p>
<p>${cv.content }</p>
<hr>
<h1>댓글수:<span id="spans">${list.size()}</span></h1>
<div style="border: 1px solid black;">
<p>댓글작성</p>
작성자:<input type="text" name="writer"><br>
내용:<input type="text" name="txt"><br>
<input id="smt" type="submit" value="댓글등록">
<br>
</div>
<table>
<tr>
<th>번호</th>
<th>작성자</th>
<th>댓글내용</th>
</tr>
<c:forEach var ="repeat" items="${list }">
<tr>
<td>${repeat.count }</td>
<td>${repeat.writer }</td>
<td>${repeat.bottomcontent }</td>
</tr>
</c:forEach>
</table>
</body>
</html>
package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.json.JSONArray;
import vo.BottomContentVo;
import vo.ContextVo;
import vo.DBcon;
@WebServlet("/insertServlet")
public class insertServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String number = request.getParameter("number");
int innum = Integer.parseInt(number);
String content = request.getParameter("content");
String writer =request.getParameter("writer");
try {
Connection conn = DBcon.getConnection();
String query ="SELECT MAX(COUNT)+1 FROM bottomcontext WHERE num=?";
PreparedStatement stmt = conn.prepareStatement(query);
stmt.setInt(1, innum);
ResultSet rs = stmt.executeQuery();
rs.next();
int maxnum = rs.getInt("MAX(COUNT)+1");
String query2 = "INSERT INTO bottomcontext VALUES (?,?,?,?)";
PreparedStatement stmt2 = conn.prepareStatement(query2);
stmt2.setInt(1, maxnum);
stmt2.setInt(2, innum);
stmt2.setString(3, content);
stmt2.setString(4, writer);
stmt2.executeUpdate();
} catch (Exception e) {
e.printStackTrace();
}
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//json으로 해보기
request.setCharacterEncoding("utf-8");
String number = request.getParameter("number");
int innum = Integer.parseInt(number);
String content = request.getParameter("content");
String writer =request.getParameter("writer");
try {
Connection conn = DBcon.getConnection();
String query ="SELECT MAX(COUNT)+1 FROM bottomcontext WHERE num=?";
PreparedStatement stmt = conn.prepareStatement(query);
stmt.setInt(1, innum);
ResultSet rs = stmt.executeQuery();
rs.next();
int maxnum = rs.getInt("MAX(COUNT)+1");
String query2 = "INSERT INTO bottomcontext VALUES (?,?,?,?)";
PreparedStatement stmt2 = conn.prepareStatement(query2);
stmt2.setInt(1, maxnum);
stmt2.setInt(2, innum);
stmt2.setString(3, content);
stmt2.setString(4, writer);
int result =stmt2.executeUpdate();
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
if (result ==1 ) {
String query3 ="SELECT * FROM bottomcontext where num=? ORDER BY COUNT desc";
PreparedStatement stmt3 = conn.prepareStatement(query3);
stmt3.setInt(1, innum);
ArrayList<BottomContentVo> ar = new ArrayList<>();
ResultSet rs3 = stmt3.executeQuery();
while(rs3.next()) {
int count3 = rs3.getInt("count");
int num3 = rs3.getInt("num");
String bottomcontent3 = rs3.getString("bottomcontent");
String writer3 = rs3.getString("writer");
BottomContentVo bcv = new BottomContentVo(count3,num3,bottomcontent3,writer3);
ar.add(bcv);
}
JSONArray jlist = new JSONArray(ar);
String stringJlist = jlist.toString();
out.print(stringJlist);
//System.out.println(stringJlist);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
