AJAX STEP 6 - 다양한 전송 방법

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★ 데이터 송수신

■ 필요 파일들

- com.test.ajax > "Ex10.java"
- views > "ex10.jsp"

- com.test.ajax > "Ex10Data.java"

■ 소스코드

Ex10.java

package com.test.ajax;

import java.io.IOException;

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;

@WebServlet("/ex10.do")
public class Ex10 extends HttpServlet {

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

		//Ex10.java

		RequestDispatcher dispatcher = req.getRequestDispatcher("/WEB-INF/views/ex10.jsp");
		dispatcher.forward(req, resp);
	}

}

Ajax 템플릿
1. Object > 주력
2. QueryString > serialize()

// 템플릿

$('#form1').submit(()=> {

    $.ajax({
        type: 'GET',
        url: '/ajax/ex10data.do',
        data: '',
        success: (result)=>{},
        error: (a,b,c)=>console.log(a,b,c)
    });

    event.preventDefault();
    return false;

});

Ex10Data.java

package com.test.ajax;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.List;

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 org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

@WebServlet("/ex10data.do")
public class Ex10Data extends HttpServlet {

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

		//Ex10Data.java
//		m1(req, resp);
//		m2(req, resp);
//		m3(req, resp);
//		m4(req, resp);
		m5(req, resp);
		
	}
	
	private void m5(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		
		//List<DTO>
		
		AjaxDAO dao = new AjaxDAO();
		
		List<AddressDTO> list = dao.listAddress();
		
		JSONArray arr = new JSONArray();
		
		for (AddressDTO dto : list) {
			
			JSONObject obj = new JSONObject();
			
			obj.put("name", dto.getName());
			obj.put("age", dto.getAge());
			obj.put("address", dto.getAddress());
			
			arr.add(obj);
			
		}
		
		System.out.println(arr);
		
		resp.setCharacterEncoding("UTF-8");
		resp.setContentType("application/json");
		
		PrintWriter writer = resp.getWriter();
		
		writer.print(arr);
		
		writer.close();
		
	}

	private void m4(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		
		//DTO
		AjaxDAO dao = new AjaxDAO();
		
		ResearchDTO dto = dao.getResearch(1);
		
		JSONObject obj = new JSONObject();
		//obj.put("name", "홍길동");
		//obj.put("age", "20");
		
		obj.put("question", dto.getQuestion());
		obj.put("seq", dto.getSeq());
		
		//{"name":"홍길동","age":"20"}
		//System.out.println(obj.toString());
		
		resp.setCharacterEncoding("UTF-8");
		resp.setContentType("application/json");
		
		PrintWriter writer = resp.getWriter();
		
		writer.print(obj);
		
		writer.close();
		
	}

	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

		//Ex10Data.java
//		m1(req, resp);
//		m2(req, resp);
		m3(req, resp);
		
	}

	private void m3(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

	      System.out.println(req.getParameter("txt1"));
	      
	      BufferedReader reader = new BufferedReader(new InputStreamReader(req.getInputStream()));
	      
	      String line = reader.readLine();
	      
	      reader.close();
	      
//	      org.json
	      
	      // JSON 포맷의 문자열 > 자바 오브젝트로 변환
	      
	      JSONParser parser = new JSONParser();
	      
	      try {
	    	 
	    	//JSON Object > 자바 오브젝트
			JSONObject obj = (JSONObject)parser.parse(line);
			
			System.out.println(obj.get("txt1"));
			System.out.println(obj.get("txt2"));
			System.out.println(obj.get("txt3"));
			System.out.println(obj.get("txt4"));
			System.out.println(obj.get("txt5"));
			
		} catch (ParseException e) {

			e.printStackTrace();
		}
	      
   }

	private void m2(HttpServletRequest req, HttpServletResponse resp) {
		
		//String list = req.getParameter("list");
		//System.out.println(list);
		
		String[] list = req.getParameterValues("list");
		
		for (String item : list) {
			System.out.println(item);
		}
		
	}

	private void m1(HttpServletRequest req, HttpServletResponse resp) {
		
		//String data = req.getParameter("data");
		//System.out.println(data);
		
		String txt1 = req.getParameter("txt1");
		String txt2 = req.getParameter("txt2");
		String txt3 = req.getParameter("txt3");
		String txt4 = req.getParameter("txt4");
		String txt5 = req.getParameter("txt5");
		
		System.out.println(txt1);
		System.out.println(txt2);
		System.out.println(txt3);
		System.out.println(txt4);
		System.out.println(txt5);
		
	}

}

ex10.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<link rel="stylesheet" href="https://me2.do/5BvBFJ57">
<style>

</style>
</head>
<body>

	<h1>Ajax</h1>
	
	<form id="form1">
		<div>
			<input type="text" name="txt1" id="txt1" value="강아지">
		</div>
		<div>
			<input type="text" name="txt2" id="txt2" value="고양이">
		</div>
		<div>
			<input type="text" name="txt3" id="txt3" value="토끼">
		</div>
		<div>
			<input type="text" name="txt4" id="txt4" value="사자">
		</div>
		<div>
			<input type="text" name="txt5" id="txt5" value="호랑이">
		</div>
		<div>
			<input type="submit" value="보내기" id="btn1">
		</div>
	</form>
	
	<hr>
	
	<div>
		<input type="button" value="가져오기" id="btn2">
	</div>
	<div id="result" class="panel" title="result"></div>



<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.4/jquery.min.js"></script>
<script>
	
	// 템플릿
	/*
	$('#form1').submit(()=> {
		
		$.ajax({
			type: 'GET',
			url: '/ajax/ex10data.do',
			data: '',
			success: (result)=>{},
			error: (a,b,c)=>console.log(a,b,c)
		});
		
		event.preventDefault();
		return false;
		
	});
	*/
	
	//***방법 1***
	
	/*
	$('#form1').submit(()=> {
		
		let data = 'txt1=' + $('#txt1').val() 
				+ '&txt2=' + $('#txt2').val()
				+ '&txt3=' + $('#txt3').val()
				+ '&txt4=' + $('#txt4').val()
				+ '&txt5=' + $('#txt5').val();
		
		$.ajax({
			type: 'GET',
			url: '/ajax/ex10data.do',
			data: data,
			success: (result)=>{},
			error: (a,b,c)=>console.log(a,b,c)
		});
		
		event.preventDefault();
		return false;
		
	});
	*/
	
	//***방법 2***
	
	/*
	$('#form1').submit(()=> {
		
		//객체 전송
		const obj = {
			txt1: $('#txt1').val(),
			txt2: $('#txt2').val(),
			txt3: $('#txt3').val(),
			txt4: $('#txt4').val(),
			txt5: $('#txt5').val()
		};
		
		$.ajax({
			type: 'GET',
			url: '/ajax/ex10data.do',
			data: obj,
			success: (result)=>{},
			error: (a,b,c)=>console.log(a,b,c)
		});
		
		event.preventDefault();
		return false;
		
	});
	*/
	
	//***방법3***
	/*
	$('#form1').submit(()=> {
		
		$.ajax({
			type: 'GET',
			url: '/ajax/ex10data.do',
			data: {
				txt1: '딸기',
				txt2: '바나나',
				txt3: '포도'
			},
			success: (result)=>{},
			error: (a,b,c)=>console.log(a,b,c)
		});
		
		event.preventDefault();
		return false;
		
	});
	*/
	
	//방법 4
	/*
	$('#form1').submit(()=> {
		
// 		alert($('#form1').serialize());
		
		$.ajax({
			type: 'GET',
			url: '/ajax/ex10data.do',
			data: '$('#form1').serialize()',
			success: (result)=>{},
			error: (a,b,c)=>console.log(a,b,c)
		});
		
		event.preventDefault();
		return false;
		
	});
	*/
	
	//1. Object > 주력
	//2. QueryString > serialize()
	
	//방법 5
	/*
	$('#form1').submit(()=> {
		
		//String[] name = req.getParameterValues("name")
		
		const list = [ '사과', '바나나', '딸기', '포도', '귤'];
		
		$.ajax({
			type: 'GET',
			url: '/ajax/ex10data.do',
			traditional: true,
			data: {
				list: list
			},
			success: (result)=>{},
			error: (a,b,c)=>console.log(a,b,c)
		});
		
		event.preventDefault();
		return false;
		
	});
	*/
	
	//방법 6
	
	$('#form1').submit(()=> {
   
      const obj = {
         txt1: $('#txt1').val(),      
         txt2: $('#txt2').val(),      
         txt3: $('#txt3').val(),      
         txt4: $('#txt4').val(),      
         txt5: $('#txt5').val()      
      };
      
      //{"txt1":"강아지","txt2":"고양이","txt3":"토끼","txt4":"사자","txt5":"호랑이"}
      
      //alert(JSON.stringify(obj));
      
      $.ajax({
         type: 'POST',
         url: '/ajax/ex10data.do',
         contentType: 'application/json', //줄때
         data: JSON.stringify(obj),
         //dataType: 'json', //받을때
         success: (result)=>{},
         error: (a,b,c)=>console.log(a,b,c)
      });
         
      event.preventDefault();
      return false;
   });
	
	$('#btn2').click(()=> {
		
		$.ajax({
			type: 'GET',
			url: '/ajax/ex10data.do',
			
			dataType: 'json',
			success: (result)=>{
// 				$('#result').append('<div>' + result.seq + '</div>');
// 				$('#result').append('<div>' + result.question + '</div>');
				
				$(result).each((index, item) => {
					$('#result').append('<div>' + item.name + '</div>');
					$('#result').append('<div>' + item.age + '</div>');
					$('#result').append('<div>' + item.address + '</div>');
					$('#result').append('<hr>');
				});
				
			},
			error: (a,b,c)=>console.log(a,b,c)
			
		});
		
	});
	
	
</script>
</body>
</html>

■ 실행 결과

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AJAX STEP 6 - 다양한 전송 방법

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