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<title>Struts的html标签</title>
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<h1>Struts html 标签练习</h1>
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Struts HTML标签是Java开发Web应用时,特别是基于Apache Struts框架时常用的一类标签库。这些标签简化了HTML表单元素与ActionForm对象之间的交互,使得开发者可以更专注于业务逻辑,而不是繁琐的HTML代码。以下是一些核心的Struts HTML标签及其详细解释: 1. `<html:form>`:这是创建表单的基础标签,它相当于HTML中的`<form>`标签。通过指定`action`属性,可以设置表单提交的URL,通常指向一个Struts Action。`method`属性则定义了表单数据的提交方式,通常是`POST`或`GET`。 2. `<html:text>`:用于创建输入文本字段,其`name`属性对应ActionForm中的属性名,这样表单提交后,Struts框架会自动将该字段的值绑定到对应的ActionForm属性。 3. `<html:password>`:与`<html:text>`类似,但用于创建密码输入框,用户输入的内容在页面上以星号或其他字符隐藏。 4. `<html:textarea>`:创建多行文本输入框,`name`属性同样对应ActionForm中的属性名,大小可以通过`rows`和`cols`属性调整。 5. `<html:radio>`和`<html:checkbox>`:分别用于创建单选按钮和复选框,通常配合`<html:group>`使用,以便于处理一组相关的选择项。`name`属性定义了这些按钮或复选框共享的名称,`value`属性指定了提交时的值。 6. `<html:submit>`和`<html:reset>`:用于创建提交和重置按钮,点击后分别触发表单的提交和重置操作。 7. `<html:select>`、`<html:option>`和`<html:optionsCollection>`:用于创建下拉选择框。`<html:select>`定义了选择框,`<html:option>`用于添加单个选项,而`<html:optionsCollection>`则可以从集合或Map中动态生成选项。 8. `<html:hidden>`:用于创建隐藏字段,这些字段不会显示在用户界面上,但会在表单提交时一起发送。 9. `<html:link>`:创建链接,可以方便地与Struts Action配合,通过`action`属性指定链接的目标。 10. `<html:image>`:用于创建图像按钮,点击后会提交表单,通常与图像链接一起使用。 使用Struts HTML标签的优点在于它们提供了强大的类型安全性和自动化绑定,降低了因手动处理表单数据而产生的错误可能性。同时,这些标签与Struts框架紧密结合,使得代码更符合MVC(模型-视图-控制器)架构,提高了可维护性和可扩展性。 在实际开发中,我们还需要注意Struts配置文件(struts-config.xml)中的设定,比如ActionMapping和FormBean定义,它们是Struts HTML标签能正常工作的基础。通过合理的配置,我们可以实现更复杂的功能,如验证、国际化等。因此,深入理解和熟练运用Struts HTML标签对于提升Struts应用的开发效率至关重要。
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