学步园

第一个类，读取ip、存入数据到xml文件、操作从xml文件取出来的数据

/**<br /> *<br /> */<br /> package com.topinfo.hazardMonitor.util;<br /> import java.io.FileWriter;<br /> import java.io.IOException;<br /> import java.util.List;<br /> import javax.servlet.http.HttpServletRequest;<br /> import org.dom4j.Document;<br /> import org.dom4j.DocumentHelper;<br /> import org.dom4j.Element;<br /> import org.dom4j.io.OutputFormat;<br /> import org.dom4j.io.SAXReader;<br /> import org.dom4j.io.XMLWriter;<br /> /**<br /> * @author Zahir<br /> *<br /> */<br /> public class IpAddress {<br /> private static String ipAdress=null;<br /> private String XMLFile;<br /> // private static String xPath=null;<br /> private static String value="/list";</p> <p> @SuppressWarnings("unchecked")<br /> public IpAddress(){<br /> // HashMap xmlMap = new HashMap();<br /> // xmlMap.put("mo","http://www.ttt.com/ttt-TrdInfo-1-0");<br /> // xPath="//mo:list/IpAddress";<br /> }<br /> @SuppressWarnings("unchecked")<br /> public boolean judge(HttpServletRequest request,String filePath) throws IOException {<br /> boolean judge=false;<br /> XMLFile = filePath;<br /> String ip=IpAddress.getIpAddress(request);<br /> int num=0;<br /> //读取xml</p> <p> List list= ParseXml.getData(XMLFile, value);</p> <p> if(!list.isEmpty() && list !=null){<br /> for(int i=0;i<list.size();i++){<br /> if(ip.equals(list.get(i))){<br /> num++;<br /> }<br /> }<br /> if(num>3){<br /> return false;//不弹出窗口<br /> }else{<br /> IpAddress.IpAddToXml(ip,XMLFile);<br /> return true;//弹出窗口<br /> }<br /> }<br /> IpAddress.IpAddToXml(ip,XMLFile);<br /> return true;//弹出窗口</p> <p> }</p> <p> //获取ip地址<br /> private static String getIpAddress(HttpServletRequest request) {<br /> if (request.getHeader("x-forwarded-for") == null) {<br /> ipAdress= request.getRemoteAddr();<br /> return ipAdress;<br /> }<br /> ipAdress= request.getHeader("x-forwarded-for");<br /> return ipAdress;<br /> } </p> <p> public static void IpAddToXml(String ipAdress,String path) throws IOException {<br /> try {<br /> SAXReader reader = new SAXReader();<br /> Document document = reader.read(path);<br /> if(document!=null){<br /> Element root = document.getRootElement();<br /> List<Element> elements = root.elements();<br /> int index = 0;<br /> for(Element element:elements){<br /> index++;<br /> if(ipAdress.equals(element.attributeValue("ip"))){<br /> Element elem = DocumentHelper.createElement("IpAddress");<br /> elem.addAttribute("ip", ipAdress);<br /> elements.add(index,elem);<br /> break;<br /> }<br /> }<br /> OutputFormat format = OutputFormat.createPrettyPrint();<br /> format.setEncoding("UTF-8");<br /> XMLWriter writer = new XMLWriter(new FileWriter(path),format);<br /> writer.write(document);<br /> writer.close();<br /> System.out.println();<br /> }else{<br /> Document xmlfile=DocumentHelper.createDocument();<br /> Element root = xmlfile.addElement( "list" );<br /> Element element=root.addElement( "IpAddress" );<br /> element.addAttribute("ip", ipAdress);<br /> OutputFormat format = OutputFormat.createPrettyPrint();<br /> format.setEncoding("UTF-8");<br /> XMLWriter writer = new XMLWriter(new FileWriter(path),format);<br /> writer.write(document);<br /> writer.close();<br /> }</p> <p> } catch (Exception e) {<br /> // TODO Auto-generated catch block<br /> e.printStackTrace();<br /> }<br /> }<br /> }<br />  

2.从xml文件读取数据写在一个单独的类中，以便通用

/**<br /> *<br /> */<br /> package com.topinfo.hazardMonitor.util;<br /> /**<br /> * @author Zahir<br /> *<br /> */<br /> import java.util.ArrayList;<br /> import java.util.List;<br /> import org.dom4j.Document;<br /> import org.dom4j.Element;<br /> import org.dom4j.io.SAXReader;<br /> /**<br /> * XMLFile--XML文件<br /> * xPath--xpath string<br /> * value--attribute name<br /> */<br /> public class ParseXml { </p> <p> @SuppressWarnings({ "unchecked", "null" })<br /> public static List getData(String XMLFile,String value) {<br /> List result=new ArrayList();<br /> String ipAdress;<br /> int i=0;<br /> try{<br /> SAXReader reader = new SAXReader();<br /> Document document = reader.read("D:/IpAddress.xml");<br /> Element root = document.getRootElement();<br /> List<Element> elements = root.elements();<br /> for(Element element:elements){<br /> ipAdress= element.attributeValue("ip");<br /> result.add(i++, ipAdress);<br /> }</p> <p> } catch (Exception e) {<br /> e.printStackTrace();<br /> }<br /> return result;<br /> }<br /> }<br />