学习Struts提供的和Form相关的标签

作者：袖梨 2022-07-02

学习Struts提供的和Form相关的标签
继续学习Struts提供的HTML标签库。by Budi Kurniawan
在本文系列的第一部分中我讲述了如何使用Struts提供的HTML标签库来配置一个Struts应用程序。我还介绍了该标签库中的一类标签：独立使用的标签。在第二部分中我将继续介绍第二类标签：与form相关的标签。与form相关的标签包括

标签本身以及所有必须包含在其中的标签。比如，和标签就是和form相关的标签，因为如果不把它们放到一个form中它们就没有意义。
标签
标签用于生成一个HTML form。使用该标签时必须遵循许多规则。
首先，标签中必须包含一个action属性，它是这个标签中唯一必需的属性。如果不具备该属性则JSP页面会抛出一个异常。之后你必须给这个action属性指定一个有效值。一个有效值是指应用程序的Struts配置文件中元素里的任何一个子元素的访问路径。而且相应的元素中必须有一个name属性，它的值是form bean的名称。例如，如果你有这样一个标签：

那么你的Struts配置文件的元素中必须有一个如下显示为粗体的元素：

type="com.javapro.struts.LoginAction"
name="loginForm"
scope="request"
input="/login.jsp">

这就是说一个form标签是和form bean相关联的。
另一个要遵循的规则是：任何包含在中用来接收用户输入的标签（、、、

、<radio>、<checkbox>、<select>）必须在相关的form bean中有一个指定的属性值。比如，如果你有一个属性值被指定为“username”的<text>标签，那么相关的form bean中也必须有一个名为“username”的属性。输入<text>标签中的值会被用于生成form bean的userName属性。<br />除了上面所讲的属性之外，<form>标签还有一些不是必须但加上更好的“次要”的属性。比如，你可以用focus属性来生成Java</a>Script，它会“定焦”（focus）到该form所包含的一个元素上。使用focus属性时你需要给它指定元素的名称。比如，以下代码是定焦在第二个Text元素上的： <br />                                            </div>
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