??????? 昨天接到領導指示，要對地市的ＩＰ地址進行過濾，暈了，過濾啥呀，不過想歸想，那還得做不是，呵呵
開始想在服務器<Tomcat>上整一下呢，仔細一看不行，附Tomcat過濾ＩＰ方法：
限制ip，限制主機訪問:
如果想禁止指定的ip或者主機名來拒絕某些機器訪問，或者指定某些機器來訪問。
也支持分別按Engine, Host, or Context,進行以下配置：
<Context path="/examples" ...> ...
<Valve className="org.apache.catalina.valves.RemoteHostValve"
allow="*.mycompany.com,www.yourcompany.com"/>
<Valve className="org.apache.catalina.valves.RemoteAddrValve"
deny="192.168.1.*"/>
</Context>
參考：
http://jakarta.apache.org/tomcat/tomcat-5.0-doc/config/context.html
沒轍，繼續．．．
因為要過濾的ＩＰ有七十二組<(58.87.96.0??? 58.57.121.255),(219.147.0.0??? 219.147.0.211)>想到用正則表達式，因為本人對正則表達式這東西，實在不精，呵呵，也就沒敢用，呵呵
最終在于朋友交流后，采取如下形式解決的：
一、新建一xml配置文件，將要過濾的IP段寫入；
二、新建一Filter，完成過濾要求
代碼如下所示：
IP.XML
<?xml version="1.0" encoding="UTF-8"?>
<root id="allow">
?? <group>???
??? <start>122.6.192.0</start>
??? <end>122.6.255.255</end>
?? </group>
?? <group>???
??? <start>219.146.208.0</start>
??? <end>219.146.215.255</end>
?? </group>
?? <group>???
??? <start>222.174.224.0</start>
??? <end>222.174.255.255</end>
?? </group>
</root>
Filter如下所示：
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import javax.xml.parsers.*;
public class FilterServlet??? extends HttpServlet??? implements Filter {
?
? private Document doc=null;
? private FilterConfig filterConfig;
? //Handle the passed-in FilterConfig
? private String encoding = "GBK";
?
? public void init(FilterConfig filterConfig) {
??? this.filterConfig = filterConfig;
? }
? //Process the request/response pair
? public void doFilter(ServletRequest request, ServletResponse response,
?????????????????????? FilterChain filterChain) {
??
?? HttpServletResponse httpResp = null;
?? HttpServletRequest httpReq = null;
??? try {
????? String reqip = request.getRemoteHost();
????? if(null != reqip){???????
??????????reqip = reqip.replace('.','_');
????? }
????? String[] temp = reqip.split("_");
????? int[] ip = new int[temp.length];
?????
????? for(int i=0;i<temp.length;i++){???????
??????????ip[i] = new Integer(temp[i]).intValue();
????? }
????? if (response instanceof HttpServletResponse) {
??? ??
??? ?? httpReq = (HttpServletRequest)request;
??? ?? httpResp = (HttpServletResponse)response;
????? if(!viewXml(httpReq.getRealPath("/")+"/WEB-INF/ip.xml",ip)){
???????
?????? httpResp.sendRedirect("
http://welcome.sd.vnet.cn/
");
????? }
????? filterChain.doFilter(request, response);
??? }
??? }
??? catch (ServletException sx) {
??? ?filterConfig.getServletContext().log(sx.getMessage());
??? }
??? catch (IOException iox) {
????? filterConfig.getServletContext().log(iox.getMessage());
??? }catch(Exception e){
??? ?
??? ?filterConfig.getServletContext().log(e.getMessage());
??? }
? }
?
? /**
?? * 驗證請求ＩＰ是否符合要求
?? * @param xmlFile
?? * @return
?? * @throws Exception
?? */
? public boolean viewXml(String xmlFile,int[] ip) throws Exception {
??
?? int[] test = ip;
?? boolean flag = true;
?? DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance();
?? DocumentBuilder db=dbf.newDocumentBuilder();?
?? doc=db.parse(new File(xmlFile));
?? Element root = doc.getDocumentElement();
????? NodeList list = root.getElementsByTagName("group");
????? for (int i=0; i < list.getLength() ; i++) {
??????? Element element = (Element)list.item(i);
??????? NodeList titleid = element.getElementsByTagName("start");
??????? Element idElement = (Element)titleid.item(0);
??????? String ip1 = idElement.getFirstChild().getNodeValue();??????
??????? ip1 = ip1.replace('.','_');
??????? String[] ip1s = ip1.trim().split("_");
??????? Integer[] ipl1 = new Integer[ip1s.length];
??????? for(int a=0;a<ip1s.length;a++){
??????????????????ipl1[a] = new Integer(ip1s[a]);
??????? }
????????
??????? NodeList titleList = element.getElementsByTagName("end");
??????? Element titleElement = (Element)titleList.item(0);
??????? String ip2 = titleElement.getFirstChild().getNodeValue();
??????? ip2 = ip2.replace('.','_');
??????? String[] ip2s = ip2.trim().split("_");
??????? Integer[] ipl2 = new Integer[ip2s.length];
??????? for(int b=0;b<ip2s.length;b++){?????????
????????????ipl2[b] = new Integer(ip2s[b]);
??????? }
????????
??????? long test_value = test[0]*255*255*255+test[1]*255*255+test[2]*255+test[3];
??????? long ip1_value = ipl1[0]*255*255*255+ipl1[1]*255*255+ipl1[2]*255+ipl1[3];
??????? long ip2_value = ipl2[0]*255*255*255+ipl2[1]*255*255+ipl2[2]*255+ipl2[3];
???????
??????? if(test_value >= ip1_value && test_value <= ip2_value){????????
????????????return true;
??????? }
???????
????? }??????
????? return false;
? }
? public void destroy() {
??? filterConfig = null;
??? encoding = null;
? }
}
WEB.XML如下：
<filter>
??<filter-name>filterservlet</filter-name>
??<filter-class>com.lvke.web.qcbst.util.common.FilterServlet</filter-class>
?</filter>
<filter-mapping>
?? <filter-name>filterservlet</filter-name>
??<url-pattern>/*</url-pattern>
?</filter-mapping>
希望能給用到的朋友減少一下負擔，呵呵