一个简单的IP地址管理系统源代码
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import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.StringReader;
import java.util.StringTokenizer;
/*
?* Created on 2005-1-12
?*
?* TODO To change the template for this generated file go to
?* Window - Preferences - Java - Code Style - Code Templates
?*/
/**
?* @author Starshus
?* TODO To change the template for this generated type comment go to
?* Window - Preferences - Java - Code Style - Code Templates
?*/
public class IPBook
{
??? static boolean hasIP;
??? public static void main(String [] args)
??? throws Exception
??? {
??????? int choice = -1;
??????? while (choice != 0)
??????? {
??????????? IPBook ipBook = new IPBook();
??????????? System.out.print("1.增加IP地址\n" +
????????????? "2.查找IP地址\n" +
????????????? "3.删除IP地址\n" +
????????????? "0.退出程序\n输入:");
??????????? BufferedReader in =
??????????????? new BufferedReader (
??????????????????????? new InputStreamReader (System.in));
??????????? String string = in.readLine();
??????????? choice = Integer.valueOf(string).intValue();
??????????? switch(choice)
??????????? {
??????????? case 1:{
??????????????? System.out.print("请以IP标准格式输入IP:\n" +
????????????????? "比如127.0.0.1\n" +
????????????????? "输入:");
??????????????? BufferedReader input =
??????????????????? new BufferedReader (
??????????????????????????? new InputStreamReader (System.in));
??????????????? String str = input.readLine();
??????????????? System.out.println(str);
??????????????? ipBook.writeIP(str);
??????????? }break;
??????????? case 2:{
??????????????? System.out.print("请输入你要查找IP地址的头地址\n" +
????????????????? "比如你要查找127.0.0.1的话就请输入127\n" +
????????????????? "输入:");
??????????????? BufferedReader input =
??????????????????? new BufferedReader (
??????????????????????????? new InputStreamReader (System.in));
??????????????? String str = input.readLine();
??????????????? long l = Integer.valueOf(str).longValue();
??????????????? ipBook.findIP(l);
??????????????? if(hasIP)
??????????????? {
??????????????????? String result = ipBook.findIP(l);
??????????????????? System.out.println(result);
??????????????? }else{
??????????????????? System.out.println("没有找到:(");
??????????????? }
??????????? }break;
??????????? case 3:{
??????????????? System.out.print("请输入你要删除IP地址的头地址\n" +
????????????????? "比如你要删除127.0.0.1的话就请输入127\n" +
????????? "输入:");
??????????????? BufferedReader input =
??????????????????? new BufferedReader (
??????????????????????????? new InputStreamReader (System.in));
??????????????? String str = input.readLine();
??????????????? long l = Integer.valueOf(str).longValue();
??????????????? ipBook.deleteIP(l);break;
??????????? }
??????????? }
??????? }?????
??? }
??? public void inputIP(String ip)
??? throws Exception
??? {
??????? try{
??????????? BufferedReader in1 =
??????????????? new BufferedReader (
??????????????????????? new FileReader("IPBook.txt"));
??????????? String s1 = "",s2 = "";
??????????? while ((s1 =in1.readLine())!= null)
??????????? {
??????????????? s1 = s1+"\n";
??????????????? s2 = s2 + s1;
??????????? }
??????????? s2 = s2 + ip;
??????????? DataInputStream in2 =
??????????????? new DataInputStream(
??????????????????? new ByteArrayInputStream((s2.getBytes())));
??????????? DataOutputStream out =
??????????????? new DataOutputStream(
??????????????????? new BufferedOutputStream(
??????????????????????????? new FileOutputStream("IPBook.txt")));
??????????? while (in2.available() != 0)
??????????? {
??????????????? out.write(in2.read());
??????????? }
??????????? in2.close();
??????????? out.close();
??????????? System.out.println("写"+ip+"到文件IPBook.txt中!");
??????? }catch(Exception e){}
??? }
??? public String findIP(long ip)
??? throws Exception
??? {
??????? hasIP=true;
??????? String readLine ="";
??????? String result="";
??????? try{
??????????? BufferedReader in =
??????????????? new BufferedReader (
??????????????????????? new FileReader("IPBook.txt"));
??????????? long top;
??????????? while ( (readLine = in.readLine())!=null)
??????????? {
??????????????? top = topTokenizer(readLine);
??????????????? if (top == ip)
??????????????? {
??????????????????? result += readLine+"\n";
??????????????? }
??????????? }
??????????? if(result=="")
??????????????? hasIP= false;
??????? }catch(Exception e){}
??????? return result;
??? }
??? public long topTokenizer(String ip)
??? throws Exception
??? {
??????? String top = "";
??????? try{
??????????? StringTokenizer st = new StringTokenizer (ip,".");
??????????? top = st.nextToken();
??????? }catch(Exception e){}
??????? return Integer.valueOf(top).longValue();
??? }
??? public boolean isIP(String str)
??? throws Exception//判断格式是否正确
??? {
??????? try{
??????????? StringTokenizer st = new StringTokenizer (str ,".");
??????????? String s1="",s2="",s3="",s4="";
??????????? s1 = st.nextToken();
??????????? s2 = st.nextToken();
??????????? s3 = st.nextToken();
??????????? s4 = st.nextToken();
???????? }
???????? catch(Exception e){}
??????? return true;
??? }
??? public void writeIP(String ip)//向文件中加写IP地址
??? throws Exception
??? {
??????? try{
??????????? if(isIP(ip))
??????? {
??????????? try{
??????????????? inputIP(ip);
??????????? }catch(IOException e){}???????????
??????? }else
??????????? System.err.println("请正确输入IP地址!");
??????? }catch(Exception e){}
??? }
??? public void deleteIP(long ip)//用头地址删除ip
??? throws Exception
??? {
??????? String find = "";
??????? String ss = "";
??????? findIP(ip);
??????? if(hasIP)
??????? {
??????????? try{
??????????????? find = findIP(ip);
??????????????? String temp = "";
??????????????? BufferedReader in =
??????????????????? new BufferedReader(
??????????????????????????? new FileReader("IPBook.txt"));
??????????????? while (?? (temp=in.readLine())!=null?? )
??????????????? {
??????????????????? if(topTokenizer(temp)!=ip)
??????????????????? {
??????????????????????? ss += temp+"\n";
??????????????????? }
??????????????? }
??????????????? BufferedReader in2 =
??????????????????? new BufferedReader(
??????????????????????????? new StringReader(ss));
??????????????? String sss = "";
??????????????? PrintWriter out =
??????????????????? new PrintWriter (
??????????????????????????? new BufferedWriter (
??????????????????????????????????? new FileWriter("IPBook.txt")));
??????????????? while (? (sss = in2.readLine()) != null)
??????????????? {
??????????????????? out.println(sss);
??????????????? }
??????????????? out.close();
??????????????? System.out.println("已删除.");
??????????? }
??????????? catch(Exception e){}
??????? }else{
??????????? System.out.println("没有找到:(");
??????? }
??? }
}
?
本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/starshus/archive/2005/01/13/252270.aspx
