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서블릿 필터 기능 본문

JSP&Servlet

서블릿 필터 기능

gwooden22 2023. 1. 27. 22:04
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1. 서블릿 필터 기능

(귀찮음)

클라이언트 -> jsp 한글이 깨져서 encoding utf-8 매번 설정

 

(필터 설정으로 인해 귀찮음 해결)

클라이언트 -> 필터(encoding utf-8) -> jsp

                                                           -> jsp

                                                           -> jsp

 

package com.study.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class TestFilter implements Filter {

	@Override
	public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
			throws IOException, ServletException {
		// TODO Auto-generated method stub

	}

}

package com.study.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class TestFilter implements Filter {

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		// TODO Auto-generated method stub
		
	}

}

 

singup.jsp 코드 ▼

더보기 
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
    
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>


<fmt:setLocale value='<%=request.getParameter("lang") %>' />
<fmt:bundle basename="bundle.singupBundle">

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<!-- CSS only -->
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-rbsA2VBKQhggwzxH7pPCaAqO46MgnOM80zW1RWuH61DGLwZJEdK2Kadq2F9CUG65" crossorigin="anonymous">
</head>
<body>

   <div class="alert alert-secondary fs-3" role="alert">
    <fmt:message key="title"/>	
   </div>


   <div class="container mt-3">
      <div class="text-end">
        <a class="btn btn-primary me-md-2" href="?lang=ko">한국어</a>
        <a class="btn btn-primary" href="?lang=en">English</a>
      </div>
      
      <form method="post" action="test.jsp">
        <div class="mb-3">
          <label for="name" class="form-label"><fmt:message key="name"/></label>
          <input type="text" class="form-control" id="name" name="name">
        </div>
        
        <div class="mb-3">
          <label for="id" class="form-label"><fmt:message key="id"/></label>
          <input type="text" class="form-control" id="id" name="id">
        </div>
        
        <div class="mb-3">
          <label for="pw" class="form-label"><fmt:message key="pw"/></label>
          <input type="password" class="form-control" id="pw">
        </div>
        
        <div class="mb-3">
           <select class="form-select">
            <option value="1"><fmt:message key="list1"/></option>
            <option value="2"><fmt:message key="list2"/></option>
            <option value="3"><fmt:message key="list3"/></option>
           </select>
        </div>
        
        <div class="mb-3">
          <input type="radio" name="gender" value="male"><fmt:message key="male"/>
          <input type="radio" name="gender" value="female"><fmt:message key="female"/>
        </div>
        
        <button type="submit" class="btn btn-primary"><fmt:message key="btn"/></button>
      </form>
   </div>
</body>
</html>

</fmt:bundle>

 

 

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
 request.setCharacterEncoding("utf-8");
%>

<%=request.getParameter("name") %><br>
<%=request.getParameter("id") %><br>
</body>
</html>

 

어노테이션

web.xml

import javax.servlet.annotation.WebFilter;

@WebFilter("/*")

.클라이언트가 singup.jsp 이것좀 나한테 보내주세요(요청)

 

 (중간에 필터가 존재) 필터 작

 

서버에서 수락 후  singup.jsp 클라이언트에게 응답

 

chain.doFilter(request, response);

위 코드를 넣으면 필터를 거쳐 정상정인 화면이 출력이 된다.

 

 

 

request.setCharacterEncoding("utf-8");
		chain.doFilter(request, response);

어떤 페이지에서든 utf-8 한글깨짐을 방지하기 위한 설정이 완료!

 

@WebFilter("/*") 어노테이션을 사용하는 방법 외에도 web.xml을 이용한 필터 설정도 가능하다.

  <filter>
  	<filter-name>testFilter</filter-name>
  	<filter-class>com.study.filter.TestFilter</filter-class>
  </filter>
  <filter-mapping>
  	<filter-name>testFilter</filter-name>
  	<url-pattern>/*</url-pattern>
  </filter-mapping>
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