Post 방식같은경우 데이터가 body에 담겨 전달되고

    - 데이터베이스에 넣어야하는경우 

    - 공개되지 말아야할 데이터

 

Get 방식같은경우 주소창에 hello? 뒤에 보여짐 

   - 검색 같은경우

   - 보여줘도 상관없는 데이터


doPost

doGet


톰캣에서 GET방식 파라미터를 위한 인코딩 처리하기


1.useBodyEncodingForURI="true"



 <Connector connectionTimeout="20000" port="8080" protocol="HTTP/1.1"
         redirectPort="8443" useBodyEncodingForURI="true"/>



2.URIEncoding="euc-kr"

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WEB-INF/web.xml
  <servlet>
        <servlet-name>Hello</servlet-name>
        <servlet-class>com.base.Hello</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>Hello</servlet-name>
        <url-pattern>/hello2</url-pattern>
    </servlet-mapping>

src/com.base/Hello.java
package com.base;

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 Hello extends HttpServlet {

    public void doPost(HttpServletRequest request, HttpServletResponse response)  throws ServletException, IOException{

        try{
            response.setContentType("text/html;charset=utf-8");

            PrintWriter out= response.getWriter();
            
            request.setCharacterEncoding("utf-8");
            
            String name = request.getParameter("name");
            out.println("<html>");
            out.println("<head><title>form&servlet</title></head>");
            out.println("<body>");
            out.println(name+"님 방문을 환영합니다.");
            out.println("</body>");
            out.println("</html>");
            out.close();

        }catch(Exception e){
            e.printStackTrace();
        }
    }
}

WebContent/greet.html
<!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=UTF-8">
<title>폼 과 서플릿</title>
</head>

<body>
<!-- /ServletMain/hello2 == http://localhost:8080/ServletMain/hello2 -->
<form method="post" action="/ServletMain/hello2">
당신의 이름은
<input type="text" name="name"><br/>
<input type="submit" value="전송"><br/>
</form>
</body>
</html>






web.xml
 <servlet>
        <servlet-name>TodayMenu</servlet-name>
        <servlet-class>com.base.TodayMenu</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>TodayMenu</servlet-name>
        <url-pattern>/TodayMenu</url-pattern>
    </servlet-mapping>

lunch.html
<!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=UTF-8">
<title>점심 선택</title>
</head>
<body>
    <h3> 오늘점심은 무엇을 먹을까?(2개이상 선택)</h3>
    <form method="post" action="/ServletMain/TodayMenu">
        <input type="checkbox" name="lunch" value="떡볶기"> 떡볶기
        <input type="checkbox" name="lunch" value="버섯덮밥"> 버섯덮밥
        <input type="checkbox" name="lunch" value="칼국수"> 칼국수
        <input type="checkbox" name="lunch" value="치즈김밥"> 치즈김밥
        <input type="checkbox" name="lunch" value="피자"> 피자
        <input type="submit" value="전송">
    </form>
</body>
</html>

TodayMenu.java

package com.base; 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 TodayMenu extends HttpServlet{ public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException{ try{ response.setContentType("text/html;charset=utf-8"); request.setCharacterEncoding("utf-8"); PrintWriter out=response.getWriter(); out.println("<html>"); out.println("<head><title>SELECT & POST</title></head>"); out.println("<body>"); out.println("<div align=center><h3>메뉴 선택</h3></div>"); String values[]= request.getParameterValues("lunch"); for(int i=0; i<values.length; i++){ out.print("<br/>"); out.print(values[i]); } out.println(" 나 먹어야 겠다."); out.println("</body></html>"); out.close(); }catch(Exception e){ e.printStackTrace(); } } }






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src/kame.chap02/NowServlet.java

package kame.chap02;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class NowServlet extends HttpServlet {
    
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    		throws ServletException,IOException{

        response.setContentType("text/html; charset=euc-kr");

        Date now= new Date();
        
        PrintWriter writer = response.getWriter();
        writer.println("<html>");
        writer.println("<head><title>현재시간</title></head>");
        writer.println("<body>");
        writer.println("현재시간:");
        writer.println(now.toString());
        writer.println("</body>");
        writer.println("</html>");
        
        writer.close();
    }
}


WEB-INF/web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>servletMain</display-name>
  
  <servlet>
      <servlet-name>now</servlet-name>
      <servlet-class>kame.chap02.NowServlet</servlet-class>
  </servlet>

  <servlet-mapping>
  <servlet-name>now</servlet-name>
  <url-pattern>/now</url-pattern>
  </servlet-mapping>

  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>

</web-app>






Mapping









WEB-INF/web.xml
    <servlet>
        <servlet-name>HelloServlet</servlet-name>
        <servlet-class>com.base.HelloServlet</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>HelloServlet</servlet-name>
        <url-pattern>/HelloServlet</url-pattern>
    </servlet-mapping>

src/com.base/HelloServlet.java
package com.base;

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 HelloServlet extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)  throws ServletException,IOException{

        response.setContentType("text/html; charset=utf-8");

        try{
            PrintWriter out =response.getWriter();
            out.println("<html>");
            out.println("<head><title>Hello Servlet</title></head>");
            out.println("<body>");
            out.println("처음 시작하는 Servlet");
            out.println("</body>");
            out.println("</html>");
            out.close();
        }catch(Exception e){
            e.printStackTrace();
        }        
    }
}




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JSP 맛보기예제


JSP파일 만들기


<%@ 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>
첫번째 JSP!!
</body>
</html>





<%@ page language="java" contentType="text/html; charset=EUC-KR"
    pageEncoding="EUC-KR"%>
<%@ page import="java.util.Date" %>
<%@ page import="java.text.SimpleDateFormat" %>
<!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>JSP Date</title>
</head>
<body>
<%
	Date now = new Date();
	SimpleDateFormat sf = new SimpleDateFormat("yyyy년MM월dd일 E요일 a hh:mm:ss");
%>
현재 시간 : <%= now %>
<br/>
현재 시간 : <%= sf.format(now) %>
</body>
</html>




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