회원정보// .jsp파일로 넘기기

 	index.html	-- > HelloServlet	-- > SampleServlet	-- > detail.jsp
 	name을 		Object로 묶어		  여기서 풀어서		    여기에 뿌려줌

index

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
</head>
<body>
 <form action="" id="frm" method="post">
 <table>
 <tr>
 	<td>이름</td>
 	<td>
 		<input type="text" id="_name" name="name" size="20" placeholder="이름">
 	</td>
 </tr>
  <tr>
 	<td>나이</td>
 	<td>
 		<input type="text" id="_age" name="age" size="5" placeholder="나이">
 	</td>
 </tr>
 </table>
 <button type="button" id="btn">전송</button>
 </form>
 
 <script type="text/javascript">
 $(document).ready(function() {
 	$("#btn").click(function() {
 		//alert('click');
 		if ($("#_name").val()=='') {
 			alert('이름을 입력해 주십시오');
 			$("#_name").focus(); 
			
		}else if ($("#_age").val()=="") {
			alert("나이를 입력해 주십시오");
			$("#_age").focus();
			
		}else {
			$("#frm").attr("action", "hello").submit();
		}
 	});
 });
 </script>
</body>
</html>

xml

  <servlet>
  	<servlet-name>helloServlet</servlet-name>
  	<servlet-class>sample07.HelloServlet</servlet-class>
  </servlet>
  <servlet-mapping>
  	<servlet-name>helloServlet</servlet-name>
  	<url-pattern>/hello</url-pattern>
  </servlet-mapping>

HelloServlet.java

package sample07;

import java.io.IOException;

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

import dto.HumanDto;

public class HelloServlet extends HttpServlet {
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
	}
	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		//System.out.println("HelloServlet doPost");
		
		req.setCharacterEncoding("utf-8");
		
		String name = req.getParameter("name");
		int age = Integer.parseInt(req.getParameter("age"));
		System.out.println("name : " +name);
		System.out.println("age : " +age);
		
		//그냥 넘기기 -> Get으로 감
		//String ename = URLEncoder.encode(name);
		//resp.sendRedirect("sample?name=" + name + "&age=" + age);
		//-> 한글깨져서 뒷Java에서 Encoder로 설정 후 추가해줌
		
        
        //Obj로 넘기기
		HumanDto dto = new HumanDto(name, age);
		req.setAttribute("hman", dto);
		
		/* 아래 함수로 만듬
		 * RequestDispatcher dispatcher = req.getRequestDispatcher("sample");
		 * dispatcher.forward(req, resp);
		 */
		this.forward("sample", req, resp);
	}

	public void forward(String linkname, HttpServletRequest req, HttpServletResponse resp) {
		RequestDispatcher dispatcher = req.getRequestDispatcher(linkname);
		try {
			dispatcher.forward(req, resp);
		} catch (ServletException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
}

SampleServlet.java

package sample07;

import java.io.IOException;
import java.net.URLEncoder;

import javax.servlet.RequestDispatcher;
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 dto.HumanDto;

@WebServlet("/sample")
public class SampleServlet extends HttpServlet {

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		req.setCharacterEncoding("utf-8");
		
		System.out.println("SampleServlet doGet");
		
		String name = req.getParameter("name");
		int age = Integer.parseInt(req.getParameter("age"));
		System.out.println("name : " +name);
		System.out.println("age : " +age);
		
		//get
		/*
		 *  resp.sendRedirect("sample?name=" + name + "&age=" + age);
		 */
		
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		System.out.println("SampleServlet doPost");
		
		HumanDto dto = (HumanDto) req.getAttribute("hman");
		
		System.out.println(dto.toString());
		
		//다시 짐싸
		req.setAttribute("dto", dto);
		
		forward("detail.jsp", req, resp);
	}

	public void forward(String linkname, HttpServletRequest req, HttpServletResponse resp) {
		RequestDispatcher dispatcher = req.getRequestDispatcher(linkname);
		try {
			dispatcher.forward(req, resp);
		} catch (ServletException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

detail.jsp

<%@page import="dto.HumanDto"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
	HumanDto dto = (HumanDto)request.getAttribute("dto");
%>    
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>detail</title>
</head>
<body>

<h1>detail.jsp</h1>
<%
	out.println("<b>" + dto.toString() + "</b>");
%>
</body>
</html>

Dto.java

package dto;
public class HumanDto {
	private String name;
	private int age;
	public HumanDto(String name, int age) {
		super();
		this.name = name;
		this.age = age;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	@Override
	public String toString() {
		return "HumanDto [name=" + name + ", age=" + age + "]";
	}
}

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