src/com/dream/filter/LoginFilter.java

（完整代码） 1KB 

package com.dream.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginFilter implements Filter {

	public void destroy() {

	}

	public void doFilter(ServletRequest req, ServletResponse res,
			FilterChain fc) throws IOException, ServletException {
           HttpServletRequest request = (HttpServletRequest)req;
           HttpServletResponse response= (HttpServletResponse)res;
           HttpSession session = request.getSession();
           if(session.getAttribute("user")==null){
        	   response.sendRedirect(request.getContextPath()+"/page/share/login.jsp");
           }else{
        	   fc.doFilter(req, res);
           }
	}
	public void init(FilterConfig arg0) throws ServletException {

	}

}

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