?? checkfilter.java
字號:
package com.test.util;
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 com.test.bean.Student;
/**
* 權限驗證
*
* @author javabs
*
*/
public class CheckFilter implements Filter {
public void destroy() {
}
public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
Student stu = (Student) request.getSession().getAttribute("stu");
String path = request.getRequestURI();
// 不是登陸頁,且沒有登陸
if (!path.substring(path.lastIndexOf("/") + 1).equals("index.jsp")
&& stu == null) {
String cmd = request.getQueryString();
if (cmd == null) {
response.sendRedirect("index.jsp");
} else if (cmd != null && !cmd.equals("cmd=login")
&& !cmd.equals("cmd=checkCode")) {
response.sendRedirect("index.jsp");
} else {
chain.doFilter(request, response);
}
} else {
chain.doFilter(request, response);
}
}
public void init(FilterConfig arg0) throws ServletException {
}
}
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