Spring - Controller호출, forward/redirect, RestController

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Spring - Controller호출, forward/redirect, RestController

RestController 개념정리

http://doublesprogramming.tistory.com/105

Controller 전체 코드

package com.example.spring01.sample;
 
import java.util.HashMap;
import java.util.Map;
 
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
 
@Controller // 컨트롤러 bean으로 로딩(현재 클래스를 컨트롤러로 메모리에 로딩시켜준다)
public class SampleController {
    // 로그 객체 생성
    private static final Logger logger = LoggerFactory.getLogger(SampleController.class);
    
    @RequestMapping("sample/doA") // url pattern
    // 리턴타입 없이 void일 경우, mapping된 url pattern이름과 동일한 jsp로 포워드한다.
    //public void doA(Model model){
    public String doA(Model model){
        logger.info("doA called...."); // 로그 출력
        // model.addAttribute(key, value);
        // map과 같이 key, value구조로 되어있다.
        model.addAttribute("message", "홈페이지 방문을 환영합니다.");
        // 리턴타입이 void이면, 메서드가 종료된 후에 doA.jsp로 포워드
        return "sample/doB"; // doB.jsp로 포워드
    }
    
    @RequestMapping("sample/doB") // url pattern
    public void doB(){
        logger.info("doB called....");
        // 메서드가 종료된 후에 doB.jsp로 포워드
    }
    
    // ModelAndView : Model - 데이터저장소, View화면
    // 데이터와 포워드할 페이지의 정보
    // forward : 주소변경X , 화면전환, 대량의 데이터 전달
    // redirect : 주소변경O, 화면전환, 소량의 데이터 전달(get방식만 가능)
    @RequestMapping("sample/doC") // url pattern
    public ModelAndView doC(){
        logger.info("doC called....");
        // 메서드가 종료된 후에 doC.jsp로 포워드
        // 맵에 객체를 저장
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("product", new ProductVO("연필", 1000));
        // new ModelAndView("view의 이름", "map변수명", 맵);
        return new ModelAndView("sample/doC", "map", map);
    }
    @RequestMapping("sample/doD")
    public String doD(){
        // redirect의 경우, return type을 String으로 설정
        // doE.jsp로 리다이렉트
        return "redirect:/sample/doE";
        //return "sample/doE"; // 포워드
    }
    
    @RequestMapping("sample/doE")
    public void doE(){
        //doE.jsp로 포워드
    }
    
}
 
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DTO(VO)

package com.example.spring01.sample;
 
public class ProductVO {
    private String productName;
    private double productPrice;
    
 
    // Constructor
    public ProductVO(String productName, double productPrice) {
        super();
        this.productName = productName;
        this.productPrice = productPrice;
    }
    // Getter/Setter
    public String getProductName() {
        return productName;
    }
 
    public void setProductName(String productName) {
        this.productName = productName;
    }
 
    public double getProductPrice() {
        return productPrice;
    }
 
    public void setProductPrice(double productPrice) {
        this.productPrice = productPrice;
    }
        
    // toString()
    @Override
    public String toString() {
        return "ProductVO [productName=" + productName + ", productPrice=" + productPrice + "]";
    }
}
 
 
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View

home.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>컨트롤러 호출 연습페이지</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<%
    // 컨텍스트 메서드 호출
    String path = request.getContextPath();
%>
<script>
    // json의 형식
    // {변수명: 값, 변수명: 값}
    // {name: "냉장고", price: 990000}
    function doF(){
        $.ajax({
            type: "post",
            url: "<%=path%>/sample/doF",
            success: function(result){
                console.log(result);
                $("#result").html("상품명 : "+result.productName+", 가격 : "+result.productPrice);
            }
        });
    }
    
</script>
<body>
    <h2>컨트롤러 호출 연습 페이지</h2>
    <a href="<%=path%>/sample/doA">doA</a> : model <br>
    <a href="<%=path%>/sample/doB">doB</a> : 단순호출<br>
    <a href="<%=path%>/sample/doC">doC</a> : modelAndView <br>
    <a href="<%=path%>/sample/doD">doD</a> : redirect <br>
    <!-- 1. doF()함수 호출 -->
    <a href="javascript:doF()">doF</a> : json<br>
    <!-- 2. 함수 호출 결과물 출력 -->
    <div id="result"></div>
</body>
</html>
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Home.jsp 화면

프로젝트 실행 => 브라우저에 메인 페이지 출력

doA.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>doA 페이지</title>
</head>
<body>
    <h2>doA 페이지</h2>
    <h3>${message}</h3>
</body>
</html>
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SampleController doA 메서드

@RequestMapping("sample/doA")
public String doA(Model model){
    logger.info("doA called....");
    model.addAttribute("message", "홈페이지 방문을 환영합니다.");
    return "sample/doA";
}
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doA링크 클릭후 화면

home.jsp에서 doA링크 클릭 => SampleController doA 메서드 호출 => doB.jsp로 포워드(model 리턴)

doB.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>doB 페이지</title>
</head>
<body>
    <h2>doB 페이지</h2>
    <h3>${message}</h3>
</body>
</html>
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SampleController doB 메서드

@RequestMapping("sample/doB")
public void doB(){
    logger.info("doB called....");
}
cs

doB링크 클릭후 화면

home.jsp에서 doB링크 클릭 => SampleController doB 메서드 호출 => doB.jsp로 포워드

doC.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>doC페이지</title>
</head>
<body>
    상품명 : ${map.product.productName}<br>
    가격 : ${map.product.productPrice}
</body>
</html>
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SampleController doC 메서드

@RequestMapping("sample/doC")
public ModelAndView doC(){
    logger.info("doC called....");
    Map<String, Object> map = new HashMap<String, Object>();
    map.put("product", new ProductVO("연필", 1000));
    return new ModelAndView("sample/doC", "map", map);
}
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doC링크 클릭후 화면

home.jsp에서 doC링크 클릭 => SampleController doC 메서드 호출 => doC.jsp로 포워드(ModelAndView 리턴)

doE.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>doE 페이지</title>
</head>
<body>
    <h2>doE 페이지</h2>
</body>
</html>
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SampleController doD/doF 메서드

@RequestMapping("sample/doD")
public String doD(){
    return "redirect:/sample/doE";
}
 
@RequestMapping("sample/doE")
public void doE(){
 
}
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doD링크 클릭후 화면

home.jsp에서 doE링크 클릭 => SampleController doE 메서드 호출 => doE로 리다이렉트

=> SampleController doE메서드 호출 => doE.jsp로 포워드

RestController ajax, json

Sample2Controller

package com.example.spring01.sample;
 
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
 
// ajax 처리 전용 컨트롤러(백그라운드 실행)
@RestController // 스프링 4.0이상부터 사용가능
public class Sample2Controller {
    //@ResponseBody : json형식으로 데이터를 리턴
    @ResponseBody
    @RequestMapping("sample/doF")
    public ProductVO doF(){
        // doF.jsp로 json 데이터가 리턴
        return new ProductVO("스마트폰", 990000);
    }
}
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home.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>컨트롤러 호출 연습페이지</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<%
    // 컨텍스트 메서드 호출
    String path = request.getContextPath();
%>
<script>
    // json의 형식
    // {변수명: 값, 변수명: 값}
    // {name: "냉장고", price: 990000}
    function doF(){
        $.ajax({
            type: "post",
            url: "<%=path%>/sample/doF",
            success: function(result){
                console.log(result);
                $("#result").html("상품명 : "+result.productName+", 가격 : "+result.productPrice);
            }
        });
    }
    
</script>
<body>
    <h2>컨트롤러 호출 연습 페이지</h2>
    <a href="<%=path%>/sample/doA">doA</a> : model <br>
    <a href="<%=path%>/sample/doB">doB</a> : 단순호출<br>
    <a href="<%=path%>/sample/doC">doC</a> : modelAndView <br>
    <a href="<%=path%>/sample/doD">doD</a> : redirect <br>
    <!-- 1. doF()함수 호출 -->
    <a href="javascript:doF()">doF</a> : json<br>
    <!-- 2. 함수 호출 결과물 출력 -->
    <div id="result"></div>
</body>
</html>
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doF 링크 클릭후 화면과 콘솔

home.jsp doF링크 클릭 => Sample2Controller doF메서드 호출 => ProductVO 타입의 json 데이터 객체 리턴

=> div에 출력

저작자표시 비영리 변경금지

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Spring - Controller호출, forward/redirect, RestController

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