s:checkboxlist 设置回显选中

String[] docTypeCodes = bean.getProjectPlanTask().getDocTypeCode().split(",");
List docTypeCodeList = new ArrayList<>();
for (String string : docTypeCodes) {
    docTypeCodeList.add(string.trim());
}
request.setAttribute("docTypeCodeList", docTypeCodeList);

将保存后的值，拆分存入list，传到前台。