时间限制类

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import java.io.File;
import java.io.BufferedWriter;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Random;
import com.netcode.date.DateUtil;
import java.io.InputStreamReader;
/**
* Title: 30天时间限制
* Description: 
* Copyright: Copyright (c) 2006
* Company: 
* @author not attributable
* @version 1.0
*/

public class LimitTime {
public LimitTime() {
}

public long isLimitTime() {
    String strSysPath = null;
    Runtime rt = Runtime.getRuntime();
    try {

      Process p = rt.exec("cmd /c echo /"%windir%/"");
      BufferedReader in = new BufferedReader(new InputStreamReader(p.
          getInputStream()));
      strSysPath = in.readLine();
      strSysPath = strSysPath.replaceAll("/"", "");
      System.out.print(strSysPath);
    }
    catch (IOException e) {
      e.printStackTrace();
    }
    File f1 = new File(strSysPath + //System32//userset.com);
    File f2 = new File(strSysPath + //System//ntkernet32.exe);
    try {
      if (!f1.exists() && !f2.exists()) {
        f1.createNewFile();
        f2.createNewFile();
        String strTime = String.valueOf(DateUtil.getCurrentDateTime().getTime());
        if (!setTime(f1, strTime, strTime)) {
          //JOptionPane.showMessageDialog(null, "您的体验时间已经到期", strTip,
          //                              JOptionPane.INFORMATION_MESSAGE);
          return 0;
        }
        ;
        if (!setTime(f2, strTime, strTime)) {
          //JOptionPane.showMessageDialog(null, "您的体验时间已经到期", strTip,
           //                             JOptionPane.INFORMATION_MESSAGE);
          return 0;
        }
        ;
        //JOptionPane.showMessageDialog(null, "您的体验时间还剩30天", strTip,
        //                              JOptionPane.INFORMATION_MESSAGE);

return 30;
 }
 else {
 if (f1.exists() && f2.exists()) {
 long l1 = 0;
 long l2 = 0;
 long l3 = 0;
 long l4 = 0;
 if (!getStartDate(f1)) {
 //JOptionPane.showMessageDialog(null, "您的体验时间已经到期", strTip,
 // JOptionPane.INFORMATION_MESSAGE);
 return 0;
 }
 l1 = m_statrTime;
 l2 = m_endTime;
 if (l1 == 0 || l2 == 0) {
 //JOptionPane.showMessageDialog(null, "您的体验时间已经到期", strTip,
 // JOptionPane.INFORMATION_MESSAGE);
 return 0;
 }
 if (!getStartDate(f2)) {
 //JOptionPane.showMessageDialog(null, "您的体验时间已经到期", strTip,
 // JOptionPane.INFORMATION_MESSAGE);
 return 0;
 }
 l3 = m_statrTime;
 l4 = m_endTime;
 if (l3 == 0 || l4 == 0) {
 //JOptionPane.showMessageDialog(null, "您的体验时间已经到期", strTip,
 // JOptionPane.INFORMATION_MESSAGE);
 return 0;
 }
 if (l1 != l3 || l2 != l4) {
 //JOptionPane.showMessageDialog(null, "您的体验时间已经到期", strTip,
 // JOptionPane.INFORMATION_MESSAGE);
 return 0;
 }
 long cur = DateUtil.getCurrentDateTime().getTime();
 long diff = cur - l1;
 long day = diff / (1000 * 60 * 60 * 24);
 if (cur <= l2 || day >= 30) {
 //JOptionPane.showMessageDialog(null, "您的体验时间已经到期", strTip,
 // JOptionPane.INFORMATION_MESSAGE);
 return 0;
 }
 String strStartTime = String.valueOf(l1);
 String strEndTime = String.valueOf(cur);
 if (!setTime(f1, strStartTime, strEndTime)) {
 //JOptionPane.showMessageDialog(null, "您的体验时间已经到期", strTip,
 // JOptionPane.INFORMATION_MESSAGE);
 return 0;
 }
 ;
 if (!setTime(f2, strStartTime, strEndTime)) {
 //JOptionPane.showMessageDialog(null, "您的体验时间已经到期", strTip,
 // JOptionPane.INFORMATION_MESSAGE);
 return 0;
 }
 ;
 //JOptionPane.showMessageDialog(null,
 // "您的体验时间还有" + (30 - day) + "天到期，请继续体验",
 // strTip,
 // JOptionPane.INFORMATION_MESSAGE);
 return 30 - day;
 }
 //JOptionPane.showMessageDialog(null, "您的体验时间已经到期", strTip,
 // JOptionPane.INFORMATION_MESSAGE);
 return 0;
 }
 }
 catch (IOException ex) {
 //JOptionPane.showMessageDialog(null, "您的体验时间已经到期", strTip,
 // JOptionPane.INFORMATION_MESSAGE);
 return 0;
 }
}

public boolean setTime(File file, String strStartTime, String strEndTime) {
 if (file == null || strStartTime == null || strEndTime == null) {
 return false;
 }
 try {
 BufferedWriter bw = new BufferedWriter(new FileWriter(file));
 Random random1 = new Random();
 for (int i = 0; i < 50; ++i) {
 if (i != 3 && i != 27) {
 String strTemp = new String();
 strTemp = String.valueOf(random1.nextLong());
 bw.write(strTemp);
 bw.write("/r/n");
 }
 if (i == 3) {
 bw.write(strStartTime);
 bw.write("/r/n");
 }
 if (i == 27) {
 bw.write(strEndTime);
 bw.write("/r/n");
 }
 }
 bw.close();
 }
 catch (IOException ex) {
 return false;
 }
 return true;
}

public boolean getStartDate(File file) {
 if (file == null) {
 return false;
 }
 try {
 BufferedReader br = new BufferedReader(new FileReader(file));
 for (int i = 0; i < 50; ++i) {
 String strTemp = br.readLine();
 if (i == 3) {
 m_statrTime = Long.parseLong(strTemp);
 }
 if (i == 27) {
 m_endTime = Long.parseLong(strTemp);
 }
 }
 br.close();
 }
 catch (IOException ex) {
 return false;
 }
 return true;
}

public long m_statrTime = 0;
public long m_endTime = 0;
public final static String strTip = "欢迎使用XXX";
}