我不知道为什么我的表单会这样。
这是我的 JSF 页面：
<h:body>
<h:form>
<h:form>
<h:selectOneMenu value="#{productBean.product}" converter="#{productConverter}" validator="com.jsf.ProductAvailableValidator">
<f:selectItems value="#{productBean.pizza}" var="pizza" itemValue="#{pizza}" itemLabel="#{pizza.name}" />
<h:commandButton value="Dodaj" action="#{productBean.addToOrder(productBean.product.name)}" /></h:selectOneMenu>
</h:form>
<h:form>
<h:selectOneMenu value="#{productBean.product}" converter="#{productConverter}" validator="com.jsf.ProductAvailableValidator">
<f:selectItems value="#{productBean.drink}" var="drink" itemValue="#{drink}" itemLabel="#{drink.name}" />
<h:commandButton value="Dodaj" action="#{productBean.addToOrder(productBean.product.name)}" /></h:selectOneMenu>
</h:form>
<h:form>
<h:selectOneMenu value="#{productBean.product}" converter="#{productConverter}" validator="com.jsf.ProductAvailableValidator">
<f:selectItems value="#{productBean.other}" var="other" itemValue="#{other}" itemLabel="#{other.name}" />
<h:commandButton value="Dodaj" action="#{productBean.addToOrder(productBean.product.name)}" /></h:selectOneMenu>
</h:form>
<messages />
<h:outputText value="#{productBean.order}" />
<h:commandButton value="Wyczyść" action="#{ProductBean.clearOrder()}" /></h:form>
</h:body>
这是我的 ProductBean：
@ManagedBean
@SessionScoped
public class ProductBean extends Connector
{
private List<Product> products;
private List<Product> pizza;
private List<Product> drink;
private List<Product> other;
boolean first = true;
private StringBuilder order = new StringBuilder();
public String getOrder() {
return order.toString();
}
private Product product;
public Product getProduct() {
return product;
}
public void setProduct(Product product) {
this.product = product;
}
public void addToOrder(String prod)
{
System.out.println("dodaje");
if(first)
{
first = false;
this.order.append(prod);
}
else
this.order.append(" + ").append(prod);
}
public void clearOrder()
{
this.order = null;
first = true;
}
public void setProducts(List<Product> products) {
this.products = products;
}
public ProductBean() throws SQLException
{
resultSet = statement.executeQuery("SELECT * FROM dbo.products");
products = new ArrayList<Product>();
while(resultSet.next())
{
product = new Product();
product.setId_product(resultSet.getInt("id_product"));
product.setName(resultSet.getString("name"));
product.setCategory(resultSet.getInt("category_id"));
product.setIs_available(resultSet.getInt("is_available"));
products.add(product);
}
}
public Product getProductById(int id)
{
Iterator<Product> it = products.iterator();
while(it.hasNext())
{
Product prod = it.next();
if(prod.getId_product() == id)
return prod;
}
return null;
}
public List<Product> getPizza() throws SQLException
{
Iterator<Product> it = products.iterator();
pizza = new ArrayList<Product>();
while(it.hasNext())
{
Product prod = it.next();
if(prod.getCategory() == 1)
pizza.add(prod);
}
return pizza;
}
public List<Product> getDrink() throws SQLException
{
Iterator<Product> it = products.iterator();
drink = new ArrayList<Product>();
while(it.hasNext())
{
Product prod = it.next();
if(prod.getCategory() == 2)
drink.add(prod);
}
return drink;
}
public List<Product> getOther() throws SQLException
{
Iterator<Product> it = products.iterator();
other = new ArrayList<Product>();
while(it.hasNext())
{
Product prod = it.next();
if(prod.getCategory() == 3)
other.add(prod);
}
return other;
}
public List<Product> getProducts() {
return products;
}
}
我还在这里发送了一个屏幕截图，以使代码更容易和更快地分析：
这里发生的情况是，只有第一个按钮“Dodaj”（意思是“添加”）有效，并在 outputlabel 中正确添加了字符串。其余的人什么都不做。当我更改顺序时，再次只有第一个有效。为什么？