servlet

2023. 12. 31. 14:47ㆍDaily Codig Reminder

helloServlet

<servlet>
  <servlet-name>HelloServlet</servlet-name>
  <servlet-class>com.controller.HelloServlet</servlet-class>
  </servlet>
  <servlet-mapping>
  <servlet-name>HelloServlet</servlet-name>
  <url-pattern>/xxx</url-pattern>
  </servlet-mapping>
//@WebServlet("/hello")
/xxx 만 기능

 

@Override
	public void destroy() {
		// TODO Auto-generated method stub
		super.destroy();
		 System.out.println("destroy 호출");
	}

	@Override
	public void init(ServletConfig config) throws ServletException {
		// TODO Auto-generated method stub
		super.init(config);
		 System.out.println("init 호출");
	}

	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public TestServlet() {
        super();
        System.out.println("생성자 호출");
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("Served at: ").append(request.getContextPath());
		 System.out.println("doGet 호출");
	}

package com.controller;

import java.io.IOException;
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;

/**
 * Servlet implementation class TestServlet
 */
@WebServlet("/TestServlet")
public class TestServlet extends HttpServlet {
	
    int num ;
    ArrayList<String> list = new ArrayList<String>();
    
   
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		int size =10;
		num++;
		list.add("홍길동");
		System.out.println("doGet num: "+num);
		System.out.println("doGet list: "+list);
		System.out.println("doGet size: "+size);
		
	}

	
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}

) HttpServletRequest API/ HttpServletResponse API

package com.controller;

import java.io.IOException;
import java.io.PrintWriter;

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

/**
 * Servlet implementation class TestServlet
 */
@WebServlet("/TestServlet")
public class TestServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public TestServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// 1. test/html지정
		response.setContentType("text/html;charset=UTF-8");
		//2. PrintWriter 생성
		PrintWriter out = response.getWriter();
		//3. out  이용한 html 코드작성
		out.println("<html>");
		out.println("<head>");
		out.println("<script src ='js/test.js'>");
		out.println("</script>");
		out.println("</head>");
		out.println("<body>");
		out.println("<h1>서블릿 응답처리 실습</h1>");
		out.println("<p>Hello WOrld</p>");
		out.println("</body></html>");
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}

 

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>로그인폼</h1>
<a href="login">로그인 서블릿 요청</a>
<form action="login" method="get">
	아이디<input type="text" name="userid"><br>
	비밀번호<input type="text" name="passwd"><br>
	<input type="submit" value="로그인">
	<hr>
</form>
<form action="login" method="post">
	아이디<input type="text" name="userid"><br>
	비밀번호<input type="text" name="passwd"><br>
	<input type="submit" value="로그인">
	<hr>
</form>
<a href="test">TestServlet</a>
<form action="test" method="post">
	아이디<input type="text" name="userid"><br>
	비밀번호<input type="text" name="passwd"><br>
	<input type="submit" value="로그인">
	<hr>
</form>
</body>
</html>

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// 1. test/html지정
		response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        out.print("<html>");
        out.print("<head>");
        out.print("</head>");
        out.print("<body>");
       String my= "<table border=1>";
       my+="<tr>";
       my+="<td>이름</td>";
       my+="<td>나이</td>";
       my+="<td>주소</td>";
    		   my+="</tr>";
    		   my+="<tr>";
    		   my+="<td>홍길동</td>";
    		   my+="<td>20</td>";
    		   my+="<td>서울</td>";
    				   my+="</tr>";
    				   		my+= "</table>";
        out.print(my);
        out.print("</body>");
        out.print("</html>");
	}

<servlet>
  <servlet-name>MyServlet</servlet-name>
  <servlet-class>com.controller.MyServlet</servlet-class>
  </servlet>
  <servlet-mapping>
  <servlet-name>MyServlet</servlet-name>
  <url-pattern>/info</url-pattern>
  </servlet-mapping>

지우고 web에다 만들기

 

2) 서블릿 요청 처리

package com.controller;

import java.io.IOException;
import java.io.PrintWriter;

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

/**
 * Servlet implementation class Loginservlet
 */
@WebServlet("/Loginservlet")
public class Loginservlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Loginservlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	request.setCharacterEncoding("utf-8"); //post방식은 이거막으면 안됨
	
	String userid = request.getParameter("userid");
	String passwd = request.getParameter("passwd");
	response.setContentType("text/html;charset=UTF-8");
	PrintWriter out = response.getWriter();
	out.printf("<html><body>");
	out.printf("이름은:"+userid);
	out.printf("비번은:"+passwd);
	out.printf("</body></html>");
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}

 

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>로그인화면</h1>
<form action="Loginservlet" method="get">
	아이디: <input type="text" name="userid"><br>
	비밀번호: <input type="text" name="passwd"><br>
	 <input type="submit" value="로그인"><br>
</form>
<hr>
<form action="Loginservlet" method="post">
	아이디: <input type="text" name="userid"><br>
	비밀번호: <input type="text" name="passwd"><br>
	 <input type="submit" value="로그인"><br>
</form>
</body>
</html>

getparameterpost 

package com.controller;

import java.io.IOException;
import java.io.PrintWriter;

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

/**
 * Servlet implementation class TestServlet
 */
@WebServlet("/TestServlet")
public class TestServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public TestServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("utf-8"); //post방식은 이거막으면 안됨
		String [] fruits= request.getParameterValues("fruit");
		 System.out.println(fruits.length);
	        for (String s : fruits) {
	            System.out.println(s);
	        }
		response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        out.println("<html><body>");


        for (String s : fruits) {
            out.println(s+"<br>");
        }
        out.println("</body></html>");
		}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}

 

 

package com.controller;

import java.io.IOException;
import java.io.PrintWriter;

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

/**
 * Servlet implementation class MyServlet
 */
@WebServlet("/myLogin")
public class LoginServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public LoginServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("utf-8"); //post방식은 이거막으면 안됨
		
		String userid = request.getParameter("userid");
		String passwd = request.getParameter("passwd");
		response.setContentType("text/html;charset=UTF-8");
		PrintWriter out = response.getWriter();
		out.printf("<html><body>");
		String my= "이름은 "+userid+" 이고 비밀번호는 "+passwd;
		out.printf(my);
		out.printf("</body></html>");
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}

<body>
<form action="myLogin" method="get">
	아이디<input type="text" name="userid"><br>
	비밀번호<input type="text" name="passwd"><br>
	<input type="submit" name="로그인">
</form>
<form action="myLogin" method="post">
	아이디<input type="text" name="userid"><br>
	비밀번호<input type="text" name="passwd"><br>
	<input type="submit" name="로그인">
</form>
</body>

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