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 {
@Override
public
void
init(FilterConfig filterConfig)
throws
ServletException {
// TODO Auto-generated method stub
}
@Override
public
void
doFilter(ServletRequest request, ServletResponse response,
FilterChain chain)
throws
IOException, ServletException {
// 获得在下面代码中要用的request,response,session对象
HttpServletRequest servletRequest = (HttpServletRequest) request;
HttpServletResponse servletResponse = (HttpServletResponse) response;
HttpSession session = servletRequest.getSession();
// 获得用户请求的URI
String path = servletRequest.getRequestURI();
//System.out.println(path);
// 从session里取员工工号信息
String empId = (String) session.getAttribute(
"empId"
);
/*创建类Constants.java,里面写的是无需过滤的页面
for (int i = 0; i < Constants.NoFilter_Pages.length; i++) {
if (path.indexOf(Constants.NoFilter_Pages[i]) > -1) {
chain.doFilter(servletRequest, servletResponse);
return;
}
}*/
// 登陆页面无需过滤
if
(path.indexOf(
"/login.jsp"
) > -
1
) {
chain.doFilter(servletRequest, servletResponse);
return
;
}
// 判断如果没有取到员工信息,就跳转到登陆页面
if
(empId ==
null
||
""
.equals(empId)) {
// 跳转到登陆页面
servletResponse.sendRedirect(
"/JingXing_OA/login.jsp"
);
}
else
{
// 已经登陆,继续此次请求
chain.doFilter(request, response);
}
}
@Override
public
void
destroy() {
// TODO Auto-generated method stub
}
}
2.然后在web.xml里配置需要登陆权限验证的JSP文件:
a.如果是某个具体的JSP文件(如a.jsp)需要登陆验证:
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<!-- 配置登陆过滤器 --> <filter> <filter-name>login</filter-name> <filter- class >com.jingxing.oa.filter.LoginFilter</filter- class > </filter> <filter-mapping> <filter-name>login</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> |
b.如果是某一个目录(如a/目录)整个目录下的文件都需要登陆验证:
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<!-- 配置登陆过滤器 --> <filter> <filter-name>login</filter-name> <filter- class >com.jingxing.oa.filter.LoginFilter</filter- class > </filter> <filter-mapping> <filter-name>login</filter-name> <url-pattern>/a/*</url-pattern> </filter-mapping> |