프로그래밍/자바 웹 프로그래밍
JSP 액션태그와 Bean
파니동
2020. 2. 7. 09:00
인클루드 액션태그
페이지 안에서 다른 JSP파일을 포함할 수 있다.
duke_image.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
String name = request.getParameter("name");
String imgName = request.getParameter("imgName");
%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title> 듀크이미지 </title>
</head>
<body>
<br><br>
<h1>이름은 <%=name %> 입니다.</h1> <br><br>
<img src="./image/<%=imgName %>" />
</body>
</html>
include1.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
request.getParameter("utf-8");
%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
안녕하세요. 쇼핑몰 중심 JSP 시작입니다!!!
<br>
<jsp:include page="duke_image.jsp" flush="true">
<jsp:param name="name" value="듀크" />
<jsp:param name="imgName" value="duke.png" />
</jsp:include>
<br>
안녕하세요. 쇼핑몰 중심 JSP 끝입니다!!
</body>
</html>- 하위 jsp에 파라미터와 값을 넘길 수 있다.
자바 빈
자바 빈은 객체를 의미한다. 보통 데이터베이스의 정보를 조회하거나 데이터를 전달할 때 bean객체에 담아서 전달하게 된다. 전통코드인 자바를 사용할 수 있지만, 자바코드를 사용하지 않고, jsp의 useBean 태그를 이용할 수 도 있다.
자바 빈을 이용한 데이터 송/수신
MemberBean
package sec01.ex01;
import java.util.Date;
public class MemberBean {
private String id;
private String pwd;
private String name;
private String email;
private Date joinDate;
public MemberBean() {
}
public MemberBean(String id, String pwd, String name, String email) {
this.id = id;
this.pwd = pwd;
this.name = name;
this.email = email;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public Date getJoinDate() {
return joinDate;
}
public void setJoinDate(Date joinDate) {
this.joinDate = joinDate;
}
}- 데이터를 송/수신할 객체, (DTO 또는 VO)
MemberDAO
package sec01.ex01;
import java.sql.Connection;
import java.sql.Date;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.sql.DataSource;
public class MemberDAO {
private Connection con;
private PreparedStatement pstmt;
private DataSource dataFactory;
public MemberDAO() {
try {
Context ctx = new InitialContext();
Context envContext = (Context) ctx.lookup("java:/comp/env");
dataFactory = (DataSource) envContext.lookup("jdbc/oracle");
} catch (Exception e) {
e.printStackTrace();
}
}
public List listMembers() {
List list = new ArrayList();
try {
con = dataFactory.getConnection();
String query = "select * from t_member order by joinDate desc ";
System.out.println("prepareStatememt: " + query);
pstmt = con.prepareStatement(query);
ResultSet rs = pstmt.executeQuery();
while (rs.next()) {
String id = rs.getString("id");
String pwd = rs.getString("pwd");
String name = rs.getString("name");
String email = rs.getString("email");
Date joinDate = rs.getDate("joinDate");
MemberBean vo = new MemberBean();
vo.setId(id);
vo.setPwd(pwd);
vo.setName(name);
vo.setEmail(email);
vo.setJoinDate(joinDate);
list.add(vo);
}
rs.close();
pstmt.close();
con.close();
} catch (Exception e) {
e.printStackTrace();
}
return list;
}
public void addMember(MemberBean memberBean) {
try {
Connection con = dataFactory.getConnection();
String id = memberBean.getId();
String pwd = memberBean.getPwd();
String name = memberBean.getName();
String email = memberBean.getEmail();
String query = "insert into t_member";
query += " (id,pwd,name,email)";
query += " values(?,?,?,?)";
System.out.println("prepareStatememt: " + query);
pstmt = con.prepareStatement(query);
pstmt.setString(1, id);
pstmt.setString(2, pwd);
pstmt.setString(3, name);
pstmt.setString(4, email);
pstmt.executeUpdate();
pstmt.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}- 리스트, 회원추가 메서드가 있다.
member.jsp
<%@page import="java.util.List"%>
<%@page import="sec01.ex01.MemberDAO"%>
<%@page import="sec01.ex01.MemberBean"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
request.setCharacterEncoding("UTF-8");
%>
<%
String id = request.getParameter("id");
String pwd = request.getParameter("pwd");
String name = request.getParameter("name");
String email = request.getParameter("email");
MemberBean m = new MemberBean(id, pwd, name, email);
MemberDAO memberDAO = new MemberDAO();
memberDAO.addMember(m);
List<MemberBean> membersList = memberDAO.listMembers();
%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>회원 목록</title>
</head>
<body>
<table align="center" width="100%">
<tr align="center" bgcolor="#99ccff">
<td width="7%" >아이디</td>
<td width="7%">비밀번호</td>
<td width="5%" >이름</td>
<td width="11%" >이메일</td>
<td width="5%" >가입일</td>
</tr>
<%
if(membersList.size() == 0) {
%>
<tr>
<td colspan="5">
<p align="center"><b><span style="font-size:9pt;">
등록된 회원이 없습니다.</span></b></p>
</td>
</tr>
<%
} else {
//for(int i=0; i < membersList.size(); i++) {
for(MemberBean bean : membersList) {
//MemberBean bean = membersList.get(i);
%>
<tr align="center">
<td><%=bean.getId() %></td>
<td><%=bean.getPwd() %></td>
<td><%=bean.getName() %></td>
<td><%=bean.getEmail() %></td>
<td><%=bean.getJoinDate() %></td>
</tr>
<%
} // end for
} // end if
%>
<tr height="1" bgcolor="#99ccff">
<td colspan="5"></td>
</tr>
</table>
</body>
</html>- 자바 빈을 이용하여, 브라우저에서 넘어온 회원정보를 세팅하고, DB에 전달한다.
useBean 사용하기.
member2.jsp
<%@page import="java.util.List"%>
<%@page import="sec01.ex01.MemberDAO"%>
<%@page import="sec01.ex01.MemberBean"%>
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%
request.setCharacterEncoding("UTF-8");
%>
<jsp:useBean id="m" class="sec01.ex01.MemberBean" scope="page" />
<%
String id = request.getParameter("id");
String pwd = request.getParameter("pwd");
String name = request.getParameter("name");
String email = request.getParameter("email");
// MemberBean m = new MemberBean(id, pwd, name, email);
m.setId(id);
m.setPwd(pwd);
m.setName(name);
m.setEmail(email);
MemberDAO memberDAO = new MemberDAO();
memberDAO.addMember(m);
List<MemberBean> membersList = memberDAO.listMembers();
%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>회원 목록</title>
</head>
<body>
<table align="center" width="100%">
<tr align="center" bgcolor="#99ccff">
<td width="7%" >아이디</td>
<td width="7%">비밀번호</td>
<td width="5%" >이름</td>
<td width="11%" >이메일</td>
<td width="5%" >가입일</td>
</tr>
<%
if(membersList.size() == 0) {
%>
<tr>
<td colspan="5">
<p align="center"><b><span style="font-size:9pt;">
등록된 회원이 없습니다.</span></b></p>
</td>
</tr>
<%
} else {
//for(int i=0; i < membersList.size(); i++) {
for(MemberBean bean : membersList) {
//MemberBean bean = membersList.get(i);
%>
<tr align="center">
<td><%=bean.getId() %></td>
<td><%=bean.getPwd() %></td>
<td><%=bean.getName() %></td>
<td><%=bean.getEmail() %></td>
<td><%=bean.getJoinDate() %></td>
</tr>
<%
} // end for
} // end if
%>
<tr height="1" bgcolor="#99ccff">
<td colspan="5"></td>
</tr>
</table>
</body>
</html>- 자바 빈 생성자로 값을 셋팅하지 않고, useBean태그로 객체를 생성해 값을 설정하였다.
- 자바코드를 사용하지 않고, 객체를 조작할 수 있는 방법에는 setProperty 와 getProperty 도 있다.
출처: 자바 웹을 다루는 기술