java 实现的端口扫描器
import java.net.*;
import java.io.*;
public class PortScanner {
public static void main(String args[]){
String host="localhost";
new PortScanner().scan(host);
}
public void scan(String host){
Socket socket=null;
System.out.println("scanning...");
for(int port=1;port<65535;port++){
try {
//socket=new Socket(host,port);
socket=new Socket();
SocketAddress remoteAddr=new InetSocketAddress(host,port);
socket.connect(remoteAddr,1);//超时时间1ms
System.out.println("there is a server on port "+port);
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
//System.out.println("connot connect to port"+port);
}finally{
if(socket!=null){
try {
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
System.out.println("scan over.");
}
}
相关文档：
package com;
import java.util.*;
public class WhatDay {
public static void main(String[] args) {
Calendar c = Calendar.getInstance();
c.setTime(new Date(System.currentTimeMillis()));
int dayOfWeek = c.get(Calendar.DAY_OF_WEEK);
switch (dayOfWeek) {
ca ......
Apache Byte Code Engineering Library (BCEL)可以深入 Java
类的字节码。可以用它转换现有的类表示或者构建新的类，因为 BCEL 在单独的 JVM
指令级别上进行操作，所以可以让您对代码有最强大的控制。不过，这种能力的代价是复杂性。在本文中，Java 顾问 Dennis Sosnoski
介绍了 BCEL 的基本内容，并引导读者完成一个示� ......
今晚在逛CSDN的时候发现了，有人用java写了生成myeclipse注册码的代码，所以就抄录了下来。 o(∩_∩)o 哈哈
package gggg;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class MyEclipseGen {
private static final ......
1.读取XML文件的类：
public class XMLUtils {
private final String DB_XML_FILE = "/XMLSetting.xml";
public Properties getPropertiesfromXML() {
URL url = XMLUtils.class.getResource(dBXMLFILE);
URI uri;
try {
uri = url.toURI();
InputSource xmlfile = new InputSource(uri.g ......
