写了一个方法，用最简单的方式在页面中显示两行两列的图片。自认为是最简单的一种，在这里给献丑了。

          public String viewImages() {

               DBControl cnn = new DBControl();

               StringBuffer strsql = new StringBuffer();

               int rowCount = 2;

               int columnCount = 2;

              try {

                   String sqlstring = "select pic_url from imagepic";

                   String sqllist = "select * from (" + sqlstring + ") where rownum <=" + (rowCount * columnCount);
  
                   RowSet rss = cnn.rsRowset(sqllist);

                   if (rss.next()) {

                     for (int i = 1; i <= 2; i++) {

                      strsql.append("<tr>");

                         for (int j = 1; j <= 2; j++) {

                           if (rss.isAfterLast()) {

                               strsql.append("<td></td>");

                           } else {

                            strsql.append("<td>");
     
                           strsql .append("<img src='../..").append(rss.getString("pic_url")) .append( " 'width='80' height='60' border='0' />");
            
                           strsql.append("</td>");
                
                           rss.next();
                          }
                     }

                  strsql.append("</tr>");

               }
        }

            rss.close();

        } catch (Exception e) {
        }

       return strsql.toString();
 }