JTable内有数据，但在JScrollPane中只显示表头不显示数据

如题，JTable里有一百条数据，但是怎么都显示不出来，弄了好久，实在弄不出来，跪请大神解答。

    public void add(Vector<Vector<Object>> rowData,Vector<String> columnName) {
        if(this.number < this.countPages) {
            DefaultTableModel dtm = new DefaultTableModel(rowData, columnName);

            this.jt[number] = new JTable(dtm) {
                public boolean isCellEditable(int row, int column)
                {
                    return false;
                }
            };
            JTableHeader head = jt[number].getTableHeader(); // 创建表格标题对象
            head.setPreferredSize(new Dimension(head.getWidth(), 35));// 设置表头大小
            head.setFont(new Font("楷体", Font.PLAIN, 14));// 设置表格字体
            Font font = new Font("Menu.font", Font.PLAIN, 12);
            this.jt[number].setFont(font);
            this.jt[number].setRowHeight(25);
            DefaultTableCellRenderer r = new DefaultTableCellRenderer();
            r.setHorizontalAlignment(JLabel.CENTER);   
            this.jt[number].setDefaultRenderer(Object.class, r);

            this.js[number] = new JScrollPane();
            this.js[number].setViewportView(jt[number]);
            this.js[number].setVisible(false);
            add(js[number], BorderLayout.CENTER);
            this.number = this.number + 1;
        }
        if(number == countPages){
            this.js[0].setVisible(true);
            this.number = 0;
        }
    }

来人啊。。。大神们帮帮忙吧。。。