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import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.annotation.WebInitParam;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
@WebFilter(
urlPatterns = {"/countNum.jsp"},
initParams = {
@WebInitParam(name = "count", value = "100")
}
)
public class MyFilter implements Filter {
private int count;//访问人数
public void destroy() {
}
public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
count++;//访问数量增加
//将ServletRequest转换为HttpServletRequest
HttpServletRequest request = (HttpServletRequest) req;
//获取ServletContext
ServletContext context = request.getServletContext();
context.setAttribute("count", count);//将数量放入
chain.doFilter(req, resp);//放开拦截
}
//初始化
public void init(FilterConfig config) throws ServletException {
String param = config.getInitParameter("count");//获取初始化参数
count = Integer.valueOf(param);
}
} |
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Java技术网站 → 『 Java开发技术 』 → 『 Java Web开发技术专题 』 → 统计网站访问次数的过滤器
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