我正在开发＆＃34; eShop＆＃34; Web应用程序。我在jsp页面上列出了所有产品（带有while循环），每个产品都有一个带value="Add to Card"和name=<%idArticle%>的按钮。当用户单击按钮时，servlet的操作必须将此产品（单击的按钮）添加到购物车。
我的问题是servlet总是占用我产品的第一个id。因此，当我点击任何按钮时，值总是相同的，它是列表中产品的第一个id的值。
我已经检查了jsp的功能，但它运行正常。
所以在jsp上，当我点击一个按钮时，idArticle是点击按钮的id，但是对于servlet，该值始终是列表中产品的第一个id。
我的jsp：
<form action="AddToCard" method="POST">
<table border="1">
<%
ArticleCRUD articleCRUD = new ArticleCRUD();
List data = articleCRUD.listArticles();
Iterator iter = data.listIterator();
while (iter.hasNext()) {
Article art = (Article) iter.next();
int idArticle = art.getIdArticle();
String imagePath = null;
imagePath = "Images/" + art.getIdArticle() + ".png";
%>
<tr>
<td><img src=<%=imagePath%> width="50" height="50" alt="Picture is not available" <%=idArticle%> /> <br>
Arcticle's name: <%=art.getNomArticle()%> <br>
Price: <%=art.getPriceArticle()%> <br>
Description: <%=art.getDescriptionArticle()%> <br>
Categorie: <%=art.getCategorieArticle()%> <br>
Weight: <%=art.getWeightArticle()%> <br>
Dimensions: <%=art.getDimensionsArticle()%> <br>
<input type="submit" value="Add To Card" name="<%=idArticle%>" />
<input type="hidden" name="idUser" value=<%=idUser%> />
<input type="hidden" name="idArticle" value="<%=idArticle%>" readonly />
</td>
</tr>
<%
}
%>
</table>
</form>
这是我的servlet的后代码：
@Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
if (request.getParameter("idArticle") != null) {
System.out.println(request.getParameter("idArticle"));
} else {
System.out.println("Failed");
}
}
答案 0 :(得分：0)
这是我的servlet的后代码：
<Style TargetType="Button" x:Key="RoundedButtonStyle">
<Setter Property="Background" Value="{ThemeResource SystemControlBackgroundBaseLowBrush}" />
<Setter Property="Foreground" Value="{ThemeResource SystemControlForegroundBaseHighBrush}"/>
<Setter Property="BorderBrush" Value="{ThemeResource SystemControlForegroundTransparentBrush}" />
<Setter Property="BorderThickness" Value="{ThemeResource ButtonBorderThemeThickness}" />
<Setter Property="Padding" Value="8,4,8,4" />
<Setter Property="HorizontalAlignment" Value="Left" />
<Setter Property="VerticalAlignment" Value="Center" />
<Setter Property="FontFamily" Value="{ThemeResource ContentControlThemeFontFamily}" />
<Setter Property="FontWeight" Value="Normal" />
<Setter Property="FontSize" Value="{ThemeResource ControlContentThemeFontSize}" />
<Setter Property="UseSystemFocusVisuals" Value="True" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Grid x:Name="RootGrid" Background="{TemplateBinding Background}" CornerRadius="10">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal">
<Storyboard>
<PointerUpThemeAnimation Storyboard.TargetName="RootGrid" />
</Storyboard>
</VisualState>
<VisualState x:Name="PointerOver">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
Storyboard.TargetProperty="BorderBrush">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightBaseMediumLowBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<PointerUpThemeAnimation Storyboard.TargetName="RootGrid" />
</Storyboard>
</VisualState>
<VisualState x:Name="Pressed">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="RootGrid"
Storyboard.TargetProperty="Background">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlBackgroundBaseMediumLowBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
Storyboard.TargetProperty="BorderBrush">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightTransparentBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<PointerDownThemeAnimation Storyboard.TargetName="RootGrid" />
</Storyboard>
</VisualState>
<VisualState x:Name="Disabled">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="RootGrid"
Storyboard.TargetProperty="Background">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlBackgroundBaseLowBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlDisabledBaseMediumLowBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
Storyboard.TargetProperty="BorderBrush">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlDisabledTransparentBrush}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<ContentPresenter x:Name="ContentPresenter"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
Content="{TemplateBinding Content}"
ContentTransitions="{TemplateBinding ContentTransitions}"
ContentTemplate="{TemplateBinding ContentTemplate}"
Padding="{TemplateBinding Padding}"
HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
AutomationProperties.AccessibilityView="Raw"
CornerRadius="10"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style x:Key="CircleButton" TargetType="Button">
<Setter Property="Background">
<Setter.Value>
<LinearGradientBrush StartPoint="0.5,0" EndPoint="0.5,1">
<GradientStop Offset="0" Color="Blue"/>
<GradientStop Offset="1" Color="BlueViolet"/>
</LinearGradientBrush>
</Setter.Value>
</Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Grid>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Disabled"/>
<VisualState x:Name="Normal"/>
<VisualState x:Name="MouseOver"/>
<VisualState x:Name="Pressed">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="Inner" Storyboard.TargetProperty="(ScaleTransform.ScaleY)">
<DiscreteObjectKeyFrame KeyTime="0:0:0.0" Value="1"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="Outer" Storyboard.TargetProperty="(ScaleTransform.ScaleY)">
<DiscreteObjectKeyFrame KeyTime="0:0:0.0" Value="-1"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="FocusStates">
<VisualState x:Name="Focused"/>
<VisualState x:Name="Unfocused"/>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Ellipse Margin="4" Fill="{TemplateBinding Background}" RenderTransformOrigin="0.5,0.5">
<Ellipse.RenderTransform>
<ScaleTransform ScaleY="1" x:Name="Outer"/>
</Ellipse.RenderTransform>
</Ellipse>
<Ellipse Margin="20" Fill="{TemplateBinding Background}" RenderTransformOrigin="0.5,0.5">
<Ellipse.RenderTransform>
<ScaleTransform ScaleY="-1" x:Name="Inner"/>
</Ellipse.RenderTransform>
</Ellipse>
<ContentPresenter x:Name="content" HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>