Count website visits by ip address, and count visits by ip Address

Count website visits by ip address, and count visits by ip Address

Package web. listener; import javax. servlet. servletContext; import javax. servlet. servletContextEvent; import javax. servlet. servletContextListener; import javax. servlet. annotation. webListener; import javax. servlet. http. httpSessionAttributeListener; import javax. servlet. http. httpSessionListener; import java. util. linkedHashMap; import java. util. map; @ WebListener () public class AListener implements ServletContextListener, HttpSessionListener, listener {/** create a Map at Service Startup and save it to ServletContext **/public void contextInitialized (ServletContextEvent sce) {// create Map <String, Integer> Map = new LinkedHashMap <String, Integer> (); // obtain ServletContext application = sce. getServletContext (); application. setAttribute ("map", map);} public void contextDestroyed (ServletContextEvent sce ){}}

1 package web. filter; 2 3 import javax. servlet. *; 4 import javax. servlet. annotation. webFilter; 5 import java. io. IOException; 6 import java. util. map; 7 8/* 9 * Get Map10 from application * Get IP11 of current client from request * for statistics, save the result to Map 12 **/13 @ WebFilter (filterName = "AFilter", urlPatterns = "/*") 14 public class AFilter implements Filter {15 private FilterConfig config; 16 public void destroy () {17} 18 19 public void doFilter (ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {20/* 21*1. Obtain map22 * 2 in the application, obtain the IP address of the current client from the request 23*3. Check whether the corresponding access times of this IP address exist in the map, if yes, save the number of times + 1 back to 24*4. If this IP address does not exist, it indicates that it was the first time you visited this site, set the number of visits to 125 **/26/* 27*1. Obtain application28 **/29 ServletContext app = config. getServletContext (); 30 Map <String, Integer> map = (Map <String, Integer>) app. getAttribute ("map"); 31/* 32*2. Obtain the Client ip address 33 **/34 String ip = req. getRemoteAddr (); 35/* 36*3. Judge 37 */38 if (map. containsKey (ip) {39 int cnt = map. get (ip); 40 map. put (ip, cnt + 1); 41} else {42 map. put (ip, 1); 43} 44 app. setAttribute ("map", map); 45 46 chain. doFilter (req, resp); // certainly allow 47} 48/* 49 * This method will be executed when the server is started, in addition, this method only runs 50 **/51 public void init (FilterConfig config) throws ServletException {52 this. config = config; 53} 54}

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