Good Good Study

import java.net.*;
import java.applet.*;
import  java.io.BufferedReader;
import  java.io.BufferedWriter;
import  java.io.InputStreamReader;
import  java.io.OutputStreamWriter;
 
public class PortScan extends java.applet.Applet
{
 private String IPAddress;
 private String PortList;
 private int Port;
 public String result;
 public String errorPort;
 public String version;
 public String pingResult;

 public boolean analyseAppletArgs()
 {
  String ip = getParameter(“ip”);
  if (ip != null) {
   this.IPAddress=ip;
  }else{
   this.result=”IP is Null”;
   return false;
  }

  String port = getParameter(“port”);
  if (port != null) {
   this.PortList=port;
  }else{
   this.result=”PortList is Null”;
   return false;
  }

  return true;
 }

 public static void main(char args[]){
  
 }

 public void run()
 {
  this.version=System.getProperty(“java.version”);
  this.result=”";
  String rs = “”;
  StringBuffer s1=new StringBuffer();
  StringBuffer s2=new StringBuffer();

  char find=’`';
  int count=0;
  for(int i=0;i<this.PortList.length();i++){
   if(this.PortList.charAt(i)==find)
    count++;
  }
  String[] portArray = new String[count-1];
  String port80Result = “false”;
  portArray= this.PortList.split(“`”);
  for (int i = 0; i < portArray.length; i++){
             rs = this.scanPort(this.IPAddress, portArray[i]);
    if (rs !=”ok”){
    rs=”false”;
    }
    if (s1.length()>0)
    {
    s1.append(“`”);
    }else{
    port80Result = rs;
    }
    s1.append(rs);
  }
  this.result=s1.toString();

  if (port80Result == “ok”){
   for (int i=0; i<6; i++){
    rs = this.doPing(this.IPAddress, Integer.valueOf(portArray[0]));
    if (s2.length()>0){
     s2.append(“`”);
    }
    s2.append(rs);
   }
   this.pingResult=s2.toString();
  }else{
   this.pingResult=port80Result;
  }  
 }

 public String scanPort(String ip, String port)
 {
  if (ip != null) {
   this.IPAddress=ip;
  }else{
   return “ip is Null”;
  }

  if (port != null) {
   this.Port=Integer.valueOf(port);
  }else{
   return “port is Null”;
  }

  try
  {
   Socket TestPort = new Socket(); //if this port cannot been connected, throw a exception.
   TestPort.connect(new InetSocketAddress(this.IPAddress, this.Port), 3000);
   TestPort.setSoTimeout(3000);
   //TestPort.getInputStream().read();
   TestPort.close();
   return result=”ok”; //if connected, print ok.
  }
  catch(Exception e)
  {
   return e.getMessage(); //if not connected, print failed.
  }
 }

 public String doPing(String hostName, int Port){
  try{
   Socket socket = new Socket(hostName, Port); //if this port cannot been connected, throw a exception.
   socket.setSoTimeout(1500);
   long lasting = System.currentTimeMillis();
   long runtime;
   BufferedWriter out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), “UTF8″));

   out.write(“GET / HTTP/1.1\r\n”);
   out.write(“Connection: Close\r\n”);
   out.write(“User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)\r\n”);
   out.write(“Cache-Control: no-cache\r\n”);
   out.write(“Host: “+hostName+”\r\n”);
   out.write(“Accept: */*\r\n”);
   out.write(“\r\n”);
   out.write(“\r\n”);
   out.flush();
   // 读取[du qu]返回信息[xin xi]
   BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream(), “UTF-8″));
   String line;
   while((line = in.readLine()) != null) {
    //System.out.println(line);
    break;
   }
   out.close();
   in.close();

   runtime = System.currentTimeMillis() – lasting;
   Thread.sleep(500);
   socket.close();
   return Long.toString(runtime);
  }catch(Exception e){
   return “flase”;
  }
 }

 public void init()
    {
  if (analyseAppletArgs())
  {
   run();
  }
 }
}