jsp页面如下：
<html>
<head>
<title>jsp</title>
<script type="text/javascript">
var countline =1;
/**
*添加一行
*/
function addRow(){
var oldtr=tb.firstChild;
var tr=oldtr.cloneNode(true);
tb.appendChild(tr);
countline++;
}
/**
*删除一行
*/
function delrow(row){
if(countline>1){
if(confirm("确定删除此信息？")){
var tr=row.parentElement.parentElement;
var index=tr.rowIndex;
tb.deleteRow(index-1);
}else{
return false;
}
}else{
alert("不能删除最后一行！");
}
countline--;
}
</script>
</head>
<body>
<html:form action="/trainInsertAction.do?method=add" method="post">
<table width="80%" border="1" id="table1" cellspacing="0" cellpadding="0" align="center">
<tr>
<th nowrap>站序</th>
<th nowrap>车站</th>
<th nowrap>到时</th>
<th nowrap>发时</th>
<th nowrap>里程</th>
<th nowrap>历时</th>
<th nowrap>硬座</th>
<th nowrap>软座</th>
<th nowrap>硬卧</th>
<th nowrap>软卧</th>
<th nowrap>操作</th>
</tr>
<tbody id="tb">
<TR>
<TD><bean:write name="trainInsertForm" property="xh"/></TD>
<TD><html:text name="trainInsertForm" property="stationname" title="车站" size="12" value="" />
</TD>
<TD><html:text name="trainInsertForm" property="narrivetime" title="到时" size="10" value=""/></TD>
<TD><html:text name="trainInsertForm" property="nstarttime" title="发时" size="10" value=""/></TD>
<TD><html:text name="trainInsertForm" property="distance" title="里程" size="10" value=""/></TD>
<TD><html:text name="trainInsertForm" property="passtime" title="历时" size="14" value="0天0小时0分"/></TD>
<TD><html:text name="trainInsertForm" property="hardseat" title="硬座" size="5" value=""/></TD>
<TD><html:text name="trainInsertForm" property="softseat" title="软座" size="5" value=""/></TD>
<TD><html:text name="trainInsertForm" property="hardsleeper" title="硬卧" size="5" value=""/></TD>
<TD><html:text name="trainInsertForm" property="softsleeper" title="软卧" size="5" value=""/></TD>
<td>
<a href="#delete" onclick="delrow(this);return false">删除</a>
</td>
</TR>
</tbody>
<tr>
<td nowrap colspan="11" align="right">
<a href="#add" onclick="addRow();return false;">添加 </a>
</td>
</tr>
<tr>
<td align="center" colspan="11">
<html:button property="button" value=" 保存 " onclick="toCheck()"/>
</td>
</tr>
</table>
</html:form>
</body>
</html>
form：
上面写的jsp实现多行提交原理，在form中把PO的所有属性定义为数组的形式，然后再写一个 方法调用PO的full constructor方法，封装成一个新的list，返回。
public class TrainInsertForm extends BaseForm {
private static final long serialVersionUID = 1L;
protected static TrainService trainService;
private String[] xh;
private Long[] nid;
private String[] narrivetime;
...............................(其他属性和get,set方法略)
public List<Trainnode> makeTrainNodeListAdd() {
int length = hardseat.length;
List<Trainnode> list = new ArrayList<Trainnode>();
for (int i = 0; i < length; i++) {
Trainnode trainnode = new Trainnode(new TrainnodeId(), nd
.getNid(), nid[i], nstarttime[i], distance[i],
hardseat[i], softseat[i], hardsleeper[i],
softsleeper[i], passtime[i]);
list.add(trainnode);
}
return list;
}
PO类：
...............
/** full constructor */
public Trainnode(TrainnodeId id, Long nid, String narrivetime,
String nstarttime, Integer distance, Float hardseat,
Float softseat, Float hardsleeper, Float softsleeper,
String passtime) {
.........
}