有什么异常信息?
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没有异常,就是一片白什么也不显示

我写了个比较简单的程序用JTable显示一个指定数据库中指定table的全部数据:代码如下:

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.sql.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;
import javax.sql.rowset.*;

/**
*用JTable来显示数据库中的数据
*@author Eastsun
*@version 0.1
*/

public class ShowDataBase{
    public static void main(String[] args)throws Throwable{
        new DataBaseFrame();
    }
}
class DataBaseFrame extends JFrame{
    public ResultSet getResultSet()
      throws SQLException, IOException{  
      Properties props = new Properties();
      FileInputStream in = new FileInputStream(\"database.properties\");   //注意:数据库的属性都保存在database.properties文件中
      props.load(in);
      in.close();
      String drivers = props.getProperty(\"jdbc.drivers\");
      if (drivers != null) System.setProperty(\"jdbc.drivers\", drivers);
      String url = props.getProperty(\"jdbc.url\");
      String username = props.getProperty(\"jdbc.username\");
      String password = props.getProperty(\"jdbc.password\");
      Connection conn = DriverManager.getConnection(url, username, password);
      String table =props.getProperty(\"jdbc.table\");
      Statement stat =conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE ,ResultSet.CONCUR_READ_ONLY );
      ResultSet result =stat.executeQuery(\"SELECT * FROM \"+table);
      return result;
    }
    
    public DataBaseFrame()throws Throwable{
        super(\"ShowDataBase\");
        ResultSet rs =getResultSet();
        ResultSetTableModel model =new ResultSetTableModel(rs);
        JTable table = new JTable(model);
        add(table);
        setSize(600,400);
        setResizable(false);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
    }
}
//下面这个类是代码的关键
class ResultSetTableModel extends AbstractTableModel{  
   public ResultSetTableModel(ResultSet aResultSet){  
      rs = aResultSet;
      try{  
         rsmd = rs.getMetaData();
      }
      catch(SQLException e){  
         e.printStackTrace();
      }
   }
   public String getColumnName(int c){  
      try{  
         return rsmd.getColumnName(c + 1);
      }
      catch (SQLException e){  
         e.printStackTrace();
         return \"\";
      }
   }
   public int getColumnCount(){  
      try{  
         return rsmd.getColumnCount();
      }
      catch (SQLException e){  
         e.printStackTrace();
         return 0;
      }
   }
   public Object getValueAt(int r, int c){  
      try{  
         rs.absolute(r + 1);
         return rs.getObject(c + 1);
      }
      catch(SQLException e){  
         e.printStackTrace();
         return null;
      }
   }
   public int getRowCount(){  
      try{  
         rs.last();
         return rs.getRow();
      }
      catch(SQLException e){  
         e.printStackTrace();
         return 0;
      }
   }
   private ResultSet rs;
   private ResultSetMetaData rsmd;
}

其中database.properties文件的格式如下,保存在与代码相同的文件夹下
注意,我用的是Derby DB,和楼主的不一样,要把jdbc.drivers与jdbc.url改为适当的形式.
jdbc.drivers=org.apache.derby.jdbc.EmbeddedDriver
jdbc.url=jdbc:derby:F:/Java/JavaDB/myDB
jdbc.username=eastsun
jdbc.password=eastsun
jdbc.table=myTable

[此贴子已经被作者于2006-12-24 20:30:20编辑过]

另外,我的代码中没有关闭Connection,这一点lz可以自行改正.