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首先在web.xml 配置 參數(shù)

noLoginPaths ?參數(shù)名可自取

LoginFilter

com.imooc.filter.LoginFilter

noLoginPaths

login.jsp;fail.jsp;LoginServlet

charset

UTF-8

LoginFilter

/*

然后在 Filter 中，創(chuàng)建一個?FilterConfig 的引用， 這個引用在init中初始化，并且能夠62616964757a686964616fe4b893e5b19e31333363373763通過它獲取?中的key和value ?,

String?noLoginPaths?=?config.getInitParameter("noLoginPaths");然后通過判斷用戶請求的url 是否符合 noLoginPaths 中設(shè)置的不過濾選項，如果如何，就調(diào)用do.filter放行

關(guān)鍵代碼 ：if(noLoginPaths!=null){

String[]?strArray?=?noLoginPaths.split(";");

for?(int?i?=?0;?i?

if(strArray[i]==null?||?"".equals(strArray[i]))continue;

if(request.getRequestURI().indexOf(strArray[i])!=-1?){

arg2.doFilter(arg0,?arg1);

return;

}

}

}

完整代碼：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?{

private?FilterConfig?config;

@Override

public?void?destroy()?{

}

@Override

public?void?doFilter(ServletRequest?arg0,?ServletResponse?arg1,?FilterChain?arg2)?throws?IOException,?ServletException?{

HttpServletRequest?request?=?(HttpServletRequest)?arg0;

HttpServletResponse?response?=?(HttpServletResponse)?arg1;

HttpSession?session?=?request.getSession();

String?noLoginPaths?=?config.getInitParameter("noLoginPaths");

String?charset?=?config.getInitParameter("charset");

if(charset==null){

charset?=?"UTF-8";

}

request.setCharacterEncoding(charset);

if(noLoginPaths!=null){

String[]?strArray?=?noLoginPaths.split(";");

for?(int?i?=?0;?i?

if(strArray[i]==null?||?"".equals(strArray[i]))continue;

if(request.getRequestURI().indexOf(strArray[i])!=-1?){

arg2.doFilter(arg0,?arg1);

return;

}

}

}

if(session.getAttribute("username")!=null){

arg2.doFilter(arg0,?arg1);

}else{

response.sendRedirect("login.jsp");

}

}

@Override

public?void?init(FilterConfig?arg0)?throws?ServletException?{

config?=?arg0;

}

}

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