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(Before)BitSchool

2014/05/29 Servlet, JSP

k_brown 2014. 5. 29. 15:51
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이클립스로 실행

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import java.io.IOException;
import java.io.PrintWriter;
 
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
 
public class ReqServlet extends HttpServlet {
 
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        // TODO Auto-generated method stub
        //super.doGet(req, resp);
        // Req 정보 보기
        doPost(req,resp);
    }
 
    
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        // TODO Auto-generated method stub
        PrintWriter out = resp.getWriter();
        out.println("<html><body>");
        out.println("<h1>"+ req.getRemoteAddr()+"</h1>");  // ipv6 버전으로 출력된다.
        out.println("<h1>"+ req.getProtocol()+"</h1>");   // protocol 출력
        out.println("<h1>"+ req.getContextPath()+"</h1>");
        out.println("</body></html>");
    }
    
}
 






AutoServlet

버튼을 이용해 Servlet을 만들수 있다.



Web.xml을 맵핑을 추가하지 않고 바로 만들어 준다. 3.0이상에서만 가능.



Service() 메서드
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import java.io.IOException;
import java.io.PrintWriter;
 
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
 
public class ReqServlet extends HttpServlet {
 
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        // TODO Auto-generated method stub
        //super.service(arg0, arg1);
        
         PrintWriter out = resp.getWriter();
         if(req.getMethod() =="GET"){
            out.println("<html><body>");
            out.println("<h1>"+ req.getRemoteAddr()+"</h1>");  // ipv6 버전으로 출력된다.
            out.println("<h1>"+ req.getProtocol()+"</h1>");   // protocol 출력
            out.println("<h1>"+ req.getContextPath()+"</h1>");
            out.println("</body></html>");
         }
    }
}
 

get방식인지 post방식인지 구별해주는 메서드이다.
service메서드를 사용 결과

동일하다 .




Servlet은 javacode안에 html이 들어가있는 것이고, JSP는 html코드안에 Javacode가 들어가 있는 형태이다.


<%@  %>  - 페이지 지시자



include방식

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<%@ page language="java" contentType="text/html; charset=EUC-KR"
    pageEncoding="EUC-KR"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=EUC-KR">
<title>Insert title here</title>
</head>
<body>
<hr>
    <jsp:include page="test2.jsp">
    <jsp:param value="kkb" name="id"/>
    <jsp:param value="4444" name="pw"/>
    </jsp:include>
<hr>
 
</body>
</html>


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<%@ page language="java" contentType="text/html; charset=EUC-KR"
    pageEncoding="EUC-KR"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=EUC-KR">
<title>Insert title here</title>
</head>
<body>
    <%= request.getParameter("id") %>
    <%= request.getParameter("pw") %>
</body>
</html>




forward 방식

include액션과 유사하지만 현재페이지의 제어권을 완전히 다른 페이지로 기본형식

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<%@ page language="java" contentType="text/html; charset=EUC-KR"
    pageEncoding="EUC-KR"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=EUC-KR">
<title>Insert title here</title>
</head>
<body>
    forwarding실습
    <jsp:forward page="test2.jsp">
    <jsp:param value="bit" name="id"/>
    <jsp:param value="bit1234" name="pw"/>
    </jsp:forward>
</body>
</html>



Error

페이지의 에러처리


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<%@ page language="java" contentType="text/html; charset=EUC-KR"
    pageEncoding="EUC-KR"%>
    <%@ page errorPage="error.jsp" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=EUC-KR">
<title>Insert title here</title>
</head>
<body>
    
    
     <%=request.getParameter("id").toUpperCase() %>
</body>
</html>


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<%@ page language="java" contentType="text/html; charset=EUC-KR"
    pageEncoding="EUC-KR"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=EUC-KR">
<title>Insert title here</title>
</head>
<body>
    에러!!
</body>
</html>




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