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);
 }
}