摘要：public static ArrayList newjdbc(String url , String sql) { Connection conn=null; Statement st=null; ResultSet rt=null; ArrayList data = new ArrayList(); try { Class.forName("com.mysql.jdbc.Driver"); conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/vapor?user=root&pa 阅读全文

摘要：eclise快捷键F3跳转到类的实现方法，出现如图所示问题：source notfoundchange atttached source。点击下图红圈，Change Attached Source 出现下图所示，对话框，选择src.zip，然后点击打开，src.zip在java的jdk目录下。Ok了，点击Ok，搞定了，按eclipse快捷键F3，有用了参考：http://jingyan.baidu.com/article/642c9d34d00d8c644a46f79c.html 阅读全文

摘要：入口：package chat;import java.net.DatagramSocket;import java.net.SocketException;public class chat { /** * @param args * @throws SocketException */ public static void main(String[] args) throws SocketException { // TODO Auto-generated method stub DatagramSocket sd = new DatagramSocket(); Datagr... 阅读全文

摘要：发送端：package demo_03_15;import java.io.IOException;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress;import java.net.SocketException;import java.net.UnknownHostException;import demo_03_14.inetAddress;public class UDPsend { /** * @param args * @throws IOExcept.. 阅读全文