Servlet Basic - Servlet Basic :: 개발자로가는길

Servlet Basic - Servlet Basic

2019. 8. 6. 11:59

1. 공통 영역

1) WebContent - WEB-INF - web.xml

<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee <a href="http://xmlns.jcp.org">http://xmlns.jcp.org</a>/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1"> <display-name>webstudy1-servlet-basic</display-name> <welcome-file-list> <welcome-file>home.html</welcome-file> </welcome-file-list> <servlet> <servlet-name>HelloServlet</servlet-name> <servlet-class>step1.HelloServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>HelloServlet</servlet-name> <url-pattern>/hello</url-pattern> </servlet-mapping> </web-app>

2) WebContent - Home.html

<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Start Servlet</title> </head> <body> Start Servlet!! <a href="http://localhost:8080/webstudy1-servlet-basic/step1.html">step1.HelloServlet</a> <a href="http://localhost:8080/webstudy1-servlet-basic/step2.html">step2.PostServlet</a> <a href="http://localhost:8080/webstudy1-servlet-basic/step3.html">step3.RequestTestServlet</a> </body> </html>

2. HelloServlet

1) WebContent - step1.html

<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>step1.HelloServlet</title> </head> <body> #. 서블릿의기본 연습(get방식) <form action="hello" method="get"> 음식명 <input type="text" name="menu"> <input type="submit" value="get요청"> </form> <hr> <form action="hello" method="post"> <input type="submit" value="post요청"> </form> <a href="http://localhost:8080/webstudy1-servlet-basic/">홈으로</a> </body> </html>

2) src - HelloServlet.java

package step1; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class HelloServlet extends HttpServlet { private static final long serialVersionUID = 1L; @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.print("HelloServlet doGet()"); //응답시 전송할 컨텐츠 정보 할당 response.setContentType("text/html;charset=utf-8"); PrintWriter out=response.getWriter(); out.println("<html>"); out.println("<body bgcolor=blue>"); out.println("HelloServlet 시작 서블릿!"); out.println("메뉴명은"+request.getParameter("menu")); out.println("<a href=http://localhost:8080/webstudy1-servlet-basic/step1.html>step1</a>"); out.println("</body>"); out.println("</html>"); out.close(); } }

3. PostServlet

1) WebContent - Step2.html

2) src - PostServlet.java

package step2;
 
import java.io.IOException;
import java.io.PrintWriter;
 
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
/*
 * web.xml에서 기술했던 url-pattern역할을 @WebServlet 어노테이션으로 기술
 */
@WebServlet("/PostServlet")
public class PostServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
    public PostServlet() {
        super();
    }
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            //post 방식일 때는 request 요청 파라미터를 인코딩 해야함
            request.setCharacterEncoding("utf-8");
            response.setContentType("text/html;charset=utf-8");
            PrintWriter out=response.getWriter();
            out.println("PostServlet doPost");
            String nickName=request.getParameter("nickName");
            out.println("당신의 닉네임은 : "+nickName );
            out.println("<a href=http://localhost:8080/webstudy1-servlet-basic/step2.html>step2</a>");
            out.close();            
   } 
}

4. RequestTestServlet

1) WebContent - Step3.html

2) src - RequestTestServlet.java

package step3;
 
import java.io.IOException;
import java.io.PrintWriter;
 
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
/**
 * Servlet implementation class RequestTestServlet
 */
@WebServlet("/requestTest")
public class RequestTestServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
    public RequestTestServlet() {
        super();
    }
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html;charset=utf-8");
        PrintWriter out=response.getWriter();
        String id=request.getParameter("id");
        String name=request.getParameter("name");
        out.println("RequestTestServlet doGet() 응답");
        out.println("아이디 "+id+"");
        out.println("이름 "+name+"");
        out.println("<a href=http://localhost:8080/webstudy1-servlet-basic/step3.html>step3</a>");
        out.close();
    }
}

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Servlet Basic - Servlet Basic

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