Created
February 15, 2016 02:08
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ログインチェックのフィルターサンプルだよ
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package org.filter; | |
import java.io.IOException; | |
import javax.servlet.Filter; | |
import javax.servlet.FilterChain; | |
import javax.servlet.FilterConfig; | |
import javax.servlet.RequestDispatcher; | |
import javax.servlet.ServletRequest; | |
import javax.servlet.ServletResponse; | |
import javax.servlet.http.HttpSession; | |
import javax.servlet.http.HttpServletRequest; | |
import javax.servlet.http.HttpServletResponse; | |
import javax.servlet.ServletException; | |
public class LoginCheckFilter implements Filter{ | |
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException,ServletException{ | |
System.out.println("ログインチェック"); | |
// セッションが存在しない場合NULLを返す | |
HttpSession session = ((HttpServletRequest)req).getSession(false); | |
if(session != null){ | |
// セッションがNULLでなければ、通常どおりの遷移 | |
chain.doFilter(req, res); | |
}else{ | |
// セッションがNullならば、ログイン画面へ飛ばす | |
RequestDispatcher dispatcher = req.getRequestDispatcher("/loginform"); | |
dispatcher.forward(req,res); | |
} | |
} | |
public void init(FilterConfig config) throws ServletException{} | |
public void destroy(){} | |
} |
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