1、首先要记得sql2000 要打上sp3以上的补丁.(建议用sp4)
2、装上SQL Server 2000 Driver for JDBC Service Pack 3
   下载地址:http://www.microsoft.com/downloads/details.aspx?FamilyId=07287B11-0502-461A-B138-2AA54BFDC03A&displaylang=en

3、安装完SQL Server 2000 Driver for JDBC Service Pack 3，它默认安装在C:\Program Files\Microsoft SQL Server 2000 Driver for JDBC 里，在C:\Program Files\Microsoft SQL Server 2000 Driver for JDBC\lib 这个目录里有三个jar文件:
msbase.jar,mssqlserver.jar,msutil.jar，一定要记得把这三个文件copy到你所安装的jdk下的jre目里，这里我以的我的安装配置进行解说:
我的jdk是jdk1.5.0_09，默认安装在:
C:\Program Files\Java 里，在这个C:\Program Files\Java目录下有两个文件夹:
jdk1.5.0_09 目录 和 jre1.5.0_09目录，
前面说的的那三个jar文件一定要copy到jdk1.5.0_09目录里下的jre目录下的lib目录下的ext目录下，我这里的完整路径为:
C:\Program Files\Java\jdk1.5.0_09\jre\lib\ext

4、设置classpath，把这个三个jar文件，加进去

5、sql2000要设置为混合登录模式(windows 和 sql)

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调用示例JAVA代码

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import java.sql.SQLException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.Statement;
import java.sql.ResultSet;
//import java.*;

class CourseAppl {
    
    private Connection conn;
    private String url;
    private String serverName;
    private String portNumber;
    private String databaseName;
    private String userName;
    private String password;
    private String sql;
    
    CourseAppl() {
        
        url = "jdbc:microsoft:sqlserver://";
        serverName = "localhost";
        portNumber = "1433";
        databaseName = "test";
        userName = "sa";
        password = "";
    }
    
    private String getConnectionUrl() {
        
        //System.out.println (url + serverName + ":"
              // + portNumber + ";databaseName="
              //+ databaseName + ";");
        return url + serverName + ":"
               + portNumber + ";databaseName="
               + databaseName + ";";
    }
    
    private Connection getConnection() {
        
        try {
            
            System.out.println (getConnectionUrl());
            Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
            //Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDrive");
            conn =
                DriverManager.getConnection(getConnectionUrl(),userName,password);
                
            if(conn != null) {
                
                System.out.println ("数据库连接成功!");
            }
            
        }catch(Exception ce) {
            
            ce.printStackTrace();
            System.out.println ("getConnection() 内部错误跟踪:" +
                                ce.getMessage());
        }
        
        return conn;
    }
    
    public void display() {
        
        try {
            
            conn = getConnection();
            PreparedStatement pstmt =
                conn.prepareStatement("update friends set "+
                "salary = ? where name like ?");
            pstmt.setInt(1,10000);
            pstmt.setString(2,"李四");
            pstmt.executeUpdate();
            System.out.println ("李四的记录已经被更新!!");
            
            Statement stmt = conn.createStatement();
            ResultSet rs =
                stmt.executeQuery("select * from friends");
            if(!rs.next()) {
                System.out.println ("空表，没有数据!!");
            }else {
                
                
                System.out.print(rs.getString(1) + "\t");
                System.out.print(rs.getString(2) + "\t");
                System.out.print(rs.getInt(3) + "\t");
                System.out.print(rs.getDate(4) + "\t");
                System.out.print(rs.getInt(5) + "\t");
                System.out.println ();
                
                while(rs.next()) {
                    
                    System.out.print(rs.getString(1) + "\t");
                    System.out.print(rs.getString(2) + "\t");
                    System.out.print(rs.getInt(3) + "\t");
                    System.out.print(rs.getDate(4) + "\t");
                    System.out.print(rs.getInt(5) + "\t");
                    System.out.println ();
                }
            }
            
        }catch(SQLException ce) {
            
            System.out.println (ce);
        }
    }
    
    
    public static void main(String[] args) {
        
        CourseAppl retObj = new CourseAppl();
        retObj.getConnection();
        retObj.display();
    }
}