java的常用函数代码

import java.util.*;

import java.util.regex.Pattern;

public class StrTools {

/**    * 分割字符串    *    * @param str String 原始字符串    * @param splitsign String 分隔符    * @return String[] 分割后的字符串数组    */   @SuppressWarnings("unchecked")   public static String[] split(String str, String splitsign) {     int index;     if (str == null || splitsign == null)       return null;     ArrayList al = new ArrayList();     while ((index = str.indexOf(splitsign)) != -1) {       al.add(str.substring(0, index));       str = str.substring(index + splitsign.length());     }     al.add(str);     return (String[]) al.toArray(new String[0]);   }

 

 

 此页暂停使用。。网页编辑总出问题

 

}

 

 

 

收藏的数据库联接，csdn上的

Java code

MySQL：        String Driver="com.mysql.jdbc.Driver";    //驱动程序    String URL="jdbc:mysql://localhost:3306/db_name";    //连接的URL,db_name为数据库名        String Username="username";    //用户名    String Password="password";    //密码    Class.forName(Driver).new Instance();    Connection con=DriverManager.getConnection(URL,Username,Password);Microsoft SQL Server 2.0驱动(3个jar的那个):    String Driver="com.microsoft.jdbc.sqlserver.SQLServerDriver";    //连接SQL数据库的方法    String URL="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=db_name";    //db_name为数据库名    String Username="username";    //用户名    String Password="password";    //密码    Class.forName(Driver).new Instance();    //加载数据可驱动    Connection con=DriverManager.getConnection(URL,UserName,Password);    //Microsoft SQL Server 3.0驱动(1个jar的那个): // 老紫竹完善    String Driver="com.microsoft.sqlserver.jdbc.SQLServerDriver";    //连接SQL数据库的方法    String URL="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=db_name";    //db_name为数据库名    String Username="username";    //用户名    String Password="password";    //密码    Class.forName(Driver).new Instance();    //加载数据可驱动    Connection con=DriverManager.getConnection(URL,UserName,Password);    //Sysbase:    String Driver="com.sybase.jdbc.SybDriver";    //驱动程序    String URL="jdbc:Sysbase://localhost:5007/db_name";    //db_name为数据可名    String Username="username";    //用户名    String Password="password";    //密码    Class.forName(Driver).newInstance();        Connection con=DriverManager.getConnection(URL,Username,Password);Oracle(用thin模式):    String Driver="oracle.jdbc.driver.OracleDriver";    //连接数据库的方法    String URL="jdbc:oracle:thin:@loaclhost:1521:orcl";    //orcl为数据库的SID    String Username="username";    //用户名    String Password="password";    //密码    Class.forName(Driver).newInstance();    //加载数据库驱动    Connection con=DriverManager.getConnection(URL,Username,Password);    PostgreSQL:    String Driver="org.postgresql.Driver";    //连接数据库的方法    String URL="jdbc:postgresql://localhost/db_name";    //db_name为数据可名    String Username="username";    //用户名    String Password="password";    //密码    Class.forName(Driver).newInstance();        Connection con=DriverManager.getConnection(URL,Username,Password);DB2：    String Driver="com.ibm.db2.jdbc.app.DB2.Driver";    //连接具有DB2客户端的Provider实例    //String Driver="com.ibm.db2.jdbc.net.DB2.Driver";    //连接不具有DB2客户端的Provider实例    String URL="jdbc:db2://localhost:5000/db_name";    //db_name为数据可名    String Username="username";    //用户名    String Password="password";    //密码    Class.forName(Driver).newInstance();        Connection con=DriverManager.getConnection(URL,Username,Password);Informix:    String Driver="com.informix.jdbc.IfxDriver";        String URL="jdbc:Informix-sqli://localhost:1533/db_name:INFORMIXSER=myserver";    //db_name为数据可名    String Username="username";    //用户名    String Password="password";    //密码    Class.forName(Driver).newInstance();        Connection con=DriverManager.getConnection(URL,Username,Password);JDBC-ODBC:    String Driver="sun.jdbc.odbc.JdbcOdbcDriver";    String URL="jdbc:odbc:dbsource";    //dbsource为数据源名    String Username="username";    //用户名    String Password="password";    //密码    Class.forName(Driver).newInstance();        Connection con=DriverManager.getConnection(URL,Username,Password);

简单的txt转换xml 
Java code 
package com.liu;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.FileReader;import java.io.FileWriter;import java.util.StringTokenizer;public class TxtToXml { private String strTxtFileName; private String strXmlFileName; public TxtToXml() {  strTxtFileName = new String();  strXmlFileName = new String(); } public void createXml(String strTxt, String strXml) {  strTxtFileName = strTxt;  strXmlFileName = strXml;  String strTmp;  try {   BufferedReader inTxt = new BufferedReader(new FileReader(     strTxtFileName));   BufferedWriter outXml = new BufferedWriter(new FileWriter(     strXmlFileName));   outXml.write("<?xml version= /"1.0/" encoding=/"gb2312/"?>");   outXml.newLine();   outXml.write("<people>");   while ((strTmp = inTxt.readLine()) != null) {    StringTokenizer strToken = new StringTokenizer(strTmp, "，");    String arrTmp[];    arrTmp = new String[3];    for (int i = 0; i < 3; i++)     arrTmp[i] = new String("");    int index = 0;    outXml.newLine();    outXml.write("    <students>");    while (strToken.hasMoreElements()) {     strTmp = (String) strToken.nextElement();     strTmp = strTmp.trim();     arrTmp[index++] = strTmp;    }    outXml.newLine();    outXml.write("        <name>" + arrTmp[0] + "</name>");    outXml.newLine();    outXml.write("        <sex>" + arrTmp[1] + "</sex>");    outXml.newLine();    outXml.write("        <age>" + arrTmp[2] + "</age>");    outXml.newLine();    outXml.write("    </students>");   }   outXml.newLine();   outXml.write("</people>");   outXml.flush();  } catch (Exception e) {   e.printStackTrace();  } } public static void main(String[] args) {  String txtName = "testtxt.txt";  String xmlName = "testxml.xml";  TxtToXml thisClass = new TxtToXml();  thisClass.createXml(txtName, xmlName); }}