public void run(){
        String sql = "select * from SFA_CUST_WZ";
        try{
            FileOutputStream fos = new FileOutputStream("d:\\foo.xls");  
            HSSFWorkbook wb = new HSSFWorkbook();  
            HSSFSheet s = wb.createSheet();  
            wb.setSheetName(0, "Matrix");  
            
            _pstmt = _conn.getConn().prepareStatement(sql);
            //取结果集
            ResultSet _rs = _pstmt.executeQuery();
            //取数据结构
            ResultSetMetaData _rsm =  _rs.getMetaData();
            //取表字段总数
            int i = _rsm.getColumnCount();
            //获取字段集合
            String [] columnName = new String[i];
            int j = 0;
            for (int ri = 1; ri <= i; ri ++,j++) {
                columnName[j] = _rsm.getColumnName(ri);
            }
            //取值并写入xls
            int k = 0;
            while(_rs.next()){
                HSSFRow row = s.createRow(k); 
                for (j = 0; j < i; j++ ) {
                    HSSFCell cell = row.createCell(j); 
                    cell.setCellValue(_rs.getString(columnName[j]));  
                }
                k++;
            }
            wb.write(fos);  
            fos.close(); 
            _rs.close();
        }catch(Exception e){e.printStackTrace();}
    }