JRDesignField f = new JRDesignField();
f.setName(columnVO.getDbName());
f.setValueClass(columnVO.getFieldClass());
jasperDesign.addField(f);
JRDesignExpressionChunk chunk = new JRDesignExpressionChunk();
chunk.setText(columnVO.getDbName());
chunk.setType(JRDesignExpressionChunk.TYPE_FIELD);
JRDesignExpression expression = new JRDesignExpression();
expression.addChunk(chunk);
expression.setValueClass(columnVO.getFieldClass());
JRDesignTextField textField = new JRDesignTextField();
textField.setWidth(columnVO.getWidth());