次过滤器主要用于,判断用户是否登陆,以防直接访问应用中的网页进行提交
Filter 类的写法,
package 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.*;
import com.tarena.crm.domain.admin.Manager;
public class LoginFilter extends HttpServlet implements Filter...{
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException ...{
HttpServletRequest req=(HttpServletRequest)request;
HttpServletResponse res=(HttpServletResponse) response;
if(req.getSession().getAttribute("manager")==null)...{
res.sendRedirect("/crm/core/login.jsp");
}else
chain.doFilter(request, response);
}
public void init(FilterConfig arg0) throws ServletException ...{
}
}
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.*;
import com.tarena.crm.domain.admin.Manager;
public class LoginFilter extends HttpServlet implements Filter...{
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException ...{
HttpServletRequest req=(HttpServletRequest)request;
HttpServletResponse res=(HttpServletResponse) response;
if(req.getSession().getAttribute("manager")==null)...{
res.sendRedirect("/crm/core/login.jsp");
}else
chain.doFilter(request, response);
}
public void init(FilterConfig arg0) throws ServletException ...{
}
}
web.xml中的写法:
<url-pattern>/core/adminManage/*</url-pattern>对一个目录进行过滤
或者:
<url-pattern>/core/adminManage/test.jsp</url-pattern>对某一个特定网页进行过滤
<filter>
<filter-name>setlog</filter-name>
<filter-class>filter.LoginFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>setlog</filter-name>
<url-pattern>/core/adminManage/*</url-pattern>
</filter-mapping>
<filter-name>setlog</filter-name>
<filter-class>filter.LoginFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>setlog</filter-name>
<url-pattern>/core/adminManage/*</url-pattern>
</filter-mapping>