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Intellij Spring - Controller의 데이터 처리

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Controller의 데이터 처리

User.java 
public class User {
    private String id;
    private String password;
    private String name;
    private String email;

    public User() {
    }

    public User(String id, String password, String name, String email) {
        this.id = id;
        this.password = password;
        this.name = name;
        this.email = email;
    }

    public String getId() {
        return id;
    }

    public String getPassword() {
        return password;
    }

    public String getName() {
        return name;
    }

    public String getEmail() {
        return email;
    }

    public void setId(String id) {
        this.id = id;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    public String toString() {
        return "User{" +
                "id='" + id + '\'' +
                ", password='" + password + '\'' +
                ", name='" + name + '\'' +
                ", email='" + email + '\'' +
                '}';
    }
}
home.jsp

<%@ page contentType=”text/html;charset=UTF-8” language=”java” %>

<html>
<head>
    <title>Data 처리</title>
</head>
<body>
<form action="/value">
    <label>아이디 : <input type="text" name="id"></label>
    <label>비밀번호 : <input type="password" name="password"></label>
    <label>이름 : <input type="text" name="name"></label>
    <label>이메일 : <input type="text" name="email"></label>
    <input type="submit" value="전송">
</form>

</body>
</html>

  • HttpServletRequest

    • HomeController.java
        @Controller
  public class HomeController {
          ...
				
          @RequestMapping("/HttpServletRequest")
          public String getData(HttpServletRequest request) {
                  String id = request.getParameter("id");
                  String password = request.getParameter("password");
                  String name = request.getParameter("name");
                  String email = request.getParameter("email");
                  User user = new User(id,password,name,email);
                  System.out.println(user.toString());
                  return "home";
          }
  }

  • RequestParam

    • HomeController.java
        @Controller
  public class HomeController {
          ...
				
          @RequestMapping("/requestParam")
          public String getData(@RequestParam("id") String id,
                           @RequestParam("password") String password,
                           @RequestParam("name") String name,
                           @RequestParam("email") String email) {
                  User user = new User(id,password,name,email);
                  System.out.println(user.toString());
                  return "home";
          }
  }

  • Command Object

    • HomeController.java
        @Controller
  public class HomeController {
          ...
				
          @RequestMapping("/commandObject")
          public String getData(User user) {
                  System.out.println(user.toString());
                  return "command";
          }
  }
    • command.jsp
        <%@ page contentType="text/html;charset=UTF-8" language="java" %>
  <html>
  <head>
          <title>Data 처리</title>
  </head>
  <body>
  ${user.id}<br/>
  ${user.password}<br/>
  ${user.name}<br/>
  ${user.email}<br/>
  </body>
  </html>
      커맨드 객체를 이용하면 파라미터를 커맨드 객체로 바로 받을 수 있고 view에 넘길때 model에 넣지 않아도 자동으로 전달된다.

  • ModelAttribute

    • view에서 사용할 커맨드 객체 이름 변경
        @Controller
  public class HomeController {
          ...
				
          @RequestMapping("/commandObject")
          public String getData(@ModelAttribute("u") User user) {
                  System.out.println(user.toString());
                  return "command";
          }
  }
      command.jsp 
        <%@ page contentType="text/html;charset=UTF-8" language="java" %>
  <html>
  <head>
          <title>Data 처리</title>
  </head>
  <body>
  ${u.id}<br/>
  ${u.password}<br/>
  ${u.name}<br/>
  ${u.email}<br/>
  </body>
  </html>
    • view에서 사용 가능한 메소드 지정
        @Controller
  public class HomeController {
          ...
				
          @ModelAttribute("serverTime")
          public String getDate(){
                  SimpleDateFormat sf = new SimpleDateFormat ( "yyyy년 MM월dd일 HH시mm분ss초");
                  return sf.format(System.currentTimeMillis());
          }
				
          @RequestMapping("/commandObject")
          public String getData(@ModelAttribute("u") User user) {
                  System.out.println(user.toString());
                  return "command";
          }
  }
      command.jsp 
        <%@ page contentType="text/html;charset=UTF-8" language="java" %>
  <html>
  <head>
          <title>Data 처리</title>
  </head>
  <body>
  ${u.id}<br/>
  ${u.password}<br/>
  ${u.name}<br/>
  ${u.email}<br/>
  ${serverTime}
  </body>
  </html>
자바 스프링 프레임워크(renew ver.) - 신입 프로그래머를 위한 강좌

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