암초보

1) 스크립트 코드

<script type="text/javascript">

             var xmlHttp;

             //서버 연동을 위한 객체를 만드는 함수

             function createHttp(){

                           if(window.ActiveXObject){

                                        xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");                                      

                           }else{

                                        xmlHttp=new XMLHttpRequest();

                           }

             }

             function startRequest(){

                           createHttp(); // 통신을 위한 객체 생성

                           // 서버가 응답하면 수행할 callback함수를 등록한다.

                           xmlHttp.onreadystatechange=callback;

                           // Get방식일 경우, 다음과 같이 요청.

                           var str=document.f1.login.value;

                           // 한글 처리를 위해 사용

                           var url="/ajax1/login?login="+escape(encodeURIComponent(str));

                           xmlHttp.open("GET",url,true);

                           xmlHttp.send(null);

             }

             // 서버가 응답하면 수행할 함수

             function callback(){

                           // readystate 요청 상태 - 4 : complete

                           if(xmlHttp.readyState==4){

                                        // 서버로부터 응답 상태 - 200 : ok 

                                        if(xmlHttp.status==200){

                                                     // responseText - 서버에서 응답한 데이터가 저장

                                                     alert(xmlHttp.responseText);

                                                     document.f1.login.value="";

                                                     document.f1.login.focus();                                                                            

                                        }

                           }

             }

</script>

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2) 서블릿 코드

public void doGet(HttpServletRequest request, HttpServletResponse response)

                                        throws ServletException, IOException {

                           response.setContentType("text/html;charset=euc-kr"); // response 한글처리

                           /**

                            * 헤더에 노캐쉬를 지정하는 이유는 캐쉬된 문서를 사용하지 않고,

                            * 요청 때마다 업데이트 되도록 지정하기 위해서이다.

                            */

                           response.setHeader("Cache-Control", "no-cache");

                           PrintWriter out = response.getWriter();

                           String param=request.getParameter("login");

                           param=URLDecoder.decode(param,"UTF-8"); // 파라미터값 한글처리

                           if(param!=null && param!=""){

                                        if(param.equals("자바")){

                                                                  out.print("login success~~~~^^");

                                        }else{

                                        out.print("login fail~~~~T.T");

                                        }

                           }else{

                                        out.println("null.....");

                           }

                           out.flush();

                           out.close();

             }