2.4 GET / POST 방식
2.4.1 GET 방식
-GET 방식으로 요청이 전송되는 경우
-사용방식: <a href="list.jsp?pageNo=2">[2]</a>
-브라우저 주소 표시줄에 주소를 직접 입력해서 요청을 전송하는 경우
Html의 a 태그를 사용해서 링크를 걸어서 전송하는 경우
Html 폼 태그에서 method 속성을 GET로 지정하는 경우
2.4.2 POST 방식
사용 방식 : <form name=" " action=" " method="POST">
회원 가입 요청, 게시판 글쓰기 요청, 자료실 업로드 등을 처리할 때 사용하는 방식
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***실습9 login.html <!DOCTYPE html> <html> <head> <meta charset="EUC-KR"> <title>Insert title here</title> </head> <body>
<h1>로그인</h1> <form action="Login" method="get"> 아이디: <input type="text" name="id"/><br/> 비밀번호: <input type="text" name="passwd"><br/> <input type="submit" value="로그인"/> </form> </body> </html>
LoginServlet.java 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;
@WebServlet("/Login") public class LoginServlet extends HttpServlet { private static final long serialVersionUID = 1L;
public LoginServlet() { }
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doProcess(request, response);
}
protected void doProcess(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("euc-kr"); //설정하는 것이니 set //인코딩 먼저! -> 하고 결과값 받아와야 String id=request.getParameter("id"); String passwd=request.getParameter("passwd"); response.setContentType("text/html;charset=euc-kr"); PrintWriter out=response.getWriter(); out.print("아이디:"+id+"<br/>"); out.print("비밀번호:"+passwd+"<br/>"); }
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doProcess(request, response); }
}
GET, POST에서의 한글처리
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***실습10 memReg.html <!DOCTYPE html> <html> <head> <meta charset="EUC-KR"> <title>Insert title here</title> </head> <body> <form action="MemReg" method="post"> 회원명 : <input type="text" name="name"/><br/> 주소 : <input type="text" name="addr"/><br/> 전화번호 : <input type="text" name="tel"/><br/> 취미 : <input type="text" name="hobby"/><br/> <input type="submit" value="회원가입"/> </form> </body> </html> MemRegServlet.java
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;
@WebServlet("/MemReg") public class MemRegServlet extends HttpServlet { private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //한글인코딩, 요청처리 request.setCharacterEncoding("euc-kr");
String name=request.getParameter("name"); String addr=request.getParameter("addr"); String tel=request.getParameter("tel"); String hobby=request.getParameter("hobby");
//응답, 응답처리 response.setContentType("text/html;charset=euc-kr");
//출력 PrintWriter out=response.getWriter(); out.write("이름은"+name+"<br/>"); out.write("주소는"+addr+"<br/>"); out.write("전화번호는"+tel+"<br/>"); out.write("취미는"+name+"입니다.<br/>"); }
} |
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***실습10 do.html <!DOCTYPE html> <html> <head> <meta charset="EUC-KR"> <title>Insert title here</title> </head> <body> <h1>당신이 좋아하는 강아지를 선택하세요~</h1> <form action="choiceDog" method="post"> <!-- 배열처럼. --> <input type="checkbox" name="dog" value="image/pu.jpg"/> 푸들 <input type="checkbox" name="dog" value="image/jin.jpg"/> 진돗개 <input type="checkbox" name="dog" value="image/pung.jpg"/> 풍산개 <input type="checkbox" name="dog" value="image/sap.jpg"/> 삽살개 <input type="submit" value="선택"/>
</form> </body> </html> ChoicDogServlet.java
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;
@WebServlet("/choiceDog") public class ChoiceDogServlet extends HttpServlet { private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=euc-kr"); PrintWriter out=response.getWriter(); String[] dog=request.getParameterValues("dog");
out.write("<body bgcolor='black'>"); out.write("<table align='center' bgcolor='yellow'>"); out.write("<tr>"); //한줄의 for (int i = 0; i < dog.length; i++) { //배열반복 out.print("<td>"); out.print("<img src='"+dog[i]+"'/>"); out.print("</td>"); } out.print("</tr>"); out.print("</table></body>"); }
}
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