1. 프로젝트 생성
2. Hello서블릿
welcome page 추가
package hello.servlet;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
@ServletComponentScan //서블릿 자동 등록
@SpringBootApplication
public class ServletApplication {
public static void main(String[] args) {
SpringApplication.run(ServletApplication.class, args);
}
}
package hello.servlet.basic;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebServlet(name = "helloServlet", urlPatterns ="/hello") // /hello로 오면 이 서블릿이 실행되는 것
public class HelloServlet extends HttpServlet { //extends HttpServlet!
@Override //ctrl + O로 override할 메소드 찾아오기
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("HelloServlet.service");
System.out.println("request = " + request);
System.out.println("response = " + response);
String username = request.getParameter("username"); //reqest.getParameter로 url에 입력하는 /hello?username="kim" 같은 값을 얻어낼 수 있다.
System.out.println("username = " + username);
response.setContentType("text/plain"); //이 둘은 ContentType 에 들어간다(헤더 정보)
response.setCharacterEncoding("utf-8"); //이 둘은 ContentType 에 들어간다 //문자 세트, 즉 인코딩 정보를 알려주어야 함
response.getWriter().write("hello " + username); //getWriter().write: 얘는 body에 나타남
}
}
//application.properties
logging.level.org.apache.coyote.http11=debug;
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