我能够显示值并对其进行编辑,但是当我提交表单时,它会遇到以下错误。
爪哇
public Class Baskets {
private Basket basket;
...
public String edit(){
System.err.println("item>>>" + this.basket.getItems().get(0).getProduct().getPrice());
...
}
getter and setters
}
JSP
<form name="edit" method="POST" action="edit">
<table border="4">
<thead><td>Product</td><td>Price 2</td><td>User</td><td>Time</td></thead>
<tbody>
<s:iterator value="basket.items" var="item" status="cur">
<tr>
<s:textfield type="hidden" id="item[%{#cur.index}].id" name="item[%{#cur.index}].id" value="%{id}" theme="simple"/>
<td>
Price : <s:textfield id="item[%{#cur.index}].product.price" name="item[%{#cur.index}].product.price" value="%{prodcut.price}" theme="simple"/>
<br/>
Name: <s:label value="%{product.name}" theme="simple"/>
</td>
<td>
<s:textfield name="item[%{#cur.index}].product.price2"
id="item[%{#cur.index}].product.price2"
value="%{product.price2}" theme="simple"/>
</td>
<td><s:label value="%{name}" theme="simple"/> </td>
<td><s:label value="%{time}" theme="simple"/> </td>
</tr>
</s:iterator>
</tbody>
</table>
<input id="edit" type="submit" name="action" value="Edit"/>
</form>
控制台错误
ognl.OgnlException: source is null for getProperty(null, "0")
浏览器错误
java.lang.NullPointerException
com.myproject.controller.Baskets.edit(Baskets.java:100)
第100行如下
System.err.println("item>>>" + this.basket.getItems().get(0).getProduct().getPrice());
HTML
<form name="edit" method="POST" action="edit">
<table border="4">
<thead><td>Product</td><td>Price 2</td><td>User</td><td>Time</td></thead>
<tbody>
<tr>
<input type="hidden" name="item[0].id" value="16" id="item[0].id"/>
<td>Price : <input type="text" name="item[0].product.price"
value="55" id="item[0].product.price"/>
<br/>
Name: <label id="">Product 1</label> </td>
<td><input type="text" name="item[0].product.price2" value="1000"
id="item[0].product.price2"/></td>
<td><label id="">User1</label> </td>
<td><label id="">9:31:03 AM</label> </td>
</tr>
<tr>
<input type="hidden" name="item[1].id" value="17" id="item[1].id"/>
<td>Price : <input type="text" name="item[1].product.price"
value="60" id="item[1].product.price"/>
<br/>
Name: <label id="">Product 2</label> </td>
<td><input type="text" name="item[1].product.price2" value="1000"
id="item[1].product.price2"/></td>
<td><label id="">User1</label> </td>
<td><label id="">11:25:55 AM</label> </td>
</tr>
</tbody>
</table>
<label id="balance"></label>
<input id="edit" type="submit" name="action" value="Edit"/>
</form>