jsp调java代码输出图片

<tr>
<td class="titleTd">图片</td>
<td colspan="3" align="center">
<%=PageSelectUtils.getPicture(conversation.getPicture())%>
</td>
</tr>

public static String getPicture(String picture) {
StringBuilder builder = new StringBuilder();
if (!Validators.isEmpty(picture)) {
String[] pictures = ArrayUtils.toArray(picture);
for (String p : pictures) {
builder.append("<img src=" + "'" + "../download.st?filename=" + p + "'" + " />");
}
}
else {
builder.append("");
}
return builder.toString();
}