java.lang.Object
- javax.servlet.jsp.tagext.TagSupport
- - org.springframework.web.servlet.tags.RequestContextAwareTag
  - - org.springframework.web.servlet.tags.HtmlEscapingAwareTag
    - - org.springframework.web.servlet.tags.form.AbstractFormTag

所有已实现的接口:
Serializable, IterationTag, JspTag, Tag, TryCatchFinally
直接已知子类:
AbstractDataBoundFormElementTag
```
public abstract class AbstractFormTag
extends HtmlEscapingAwareTag
```
Base class for all JSP form tags. Provides utility methods for null-safe EL evaluation and for accessing and working with a TagWriter.
Subclasses should implement the writeTagContent(TagWriter) to perform actual tag rendering.
Subclasses (or test classes) can override the createTagWriter() method to redirect output to a Writer other than the JspWriter associated with the current PageContext.
从以下版本开始:
2.0
作者:
Rob Harrop, Juergen Hoeller
另请参阅:
序列化表格

字段概要
- 从类继承的字段 org.springframework.web.servlet.tags.RequestContextAwareTag
  logger, REQUEST_CONTEXT_PAGE_ATTRIBUTE
- 从类继承的字段 javax.servlet.jsp.tagext.TagSupport
  id, pageContext
- 从接口继承的字段 javax.servlet.jsp.tagext.IterationTag
  EVAL_BODY_AGAIN
- 从接口继承的字段 javax.servlet.jsp.tagext.Tag
  EVAL_BODY_INCLUDE, EVAL_PAGE, SKIP_BODY, SKIP_PAGE

构造器概要
构造器
构造器说明
AbstractFormTag()

方法概要

所有方法实例方法抽象方法具体方法
修饰符和类型	方法	说明
`protected TagWriter`	`createTagWriter()`	Create the `TagWriter` which all output will be written to.
`protected int`	`doStartTagInternal()`	Provide a simple template method that calls `createTagWriter()` and passes the created `TagWriter` to the `writeTagContent(TagWriter)` method.
`protected Object`	`evaluate(String attributeName, Object value)`	Evaluate the supplied value for the supplied attribute name.
`protected String`	`getDisplayString(Object value)`	Get the display value of the supplied `Object`, HTML escaped as required.
`protected String`	`getDisplayString(Object value, PropertyEditor propertyEditor)`	Get the display value of the supplied `Object`, HTML escaped as required.
`protected boolean`	`isDefaultHtmlEscape()`	Overridden to default to `true` in case of no explicit default given.
`protected void`	`writeOptionalAttribute(TagWriter tagWriter, String attributeName, String value)`	Optionally writes the supplied value under the supplied attribute name into the supplied `TagWriter`.
`protected abstract int`	`writeTagContent(TagWriter tagWriter)`	Subclasses should implement this method to perform tag content rendering.

从类继承的方法 org.springframework.web.servlet.tags.HtmlEscapingAwareTag
htmlEscape, isHtmlEscape, isResponseEncodedHtmlEscape, setHtmlEscape

从类继承的方法 org.springframework.web.servlet.tags.RequestContextAwareTag
doCatch, doFinally, doStartTag, getRequestContext

从类继承的方法 javax.servlet.jsp.tagext.TagSupport
doAfterBody, doEndTag, findAncestorWithClass, getId, getParent, getValue, getValues, release, removeValue, setId, setPageContext, setParent, setValue

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 构造器详细资料
  - AbstractFormTag
```
public AbstractFormTag()
```
- 方法详细资料
  - evaluate
```
protected Object evaluate(String attributeName,
                          Object value)
                   throws JspException
```
    Evaluate the supplied value for the supplied attribute name.
    The default implementation simply returns the given value as-is.
    抛出:
    JspException
  - writeOptionalAttribute
```
protected final void writeOptionalAttribute(TagWriter tagWriter,
                                            String attributeName,
                                            String value)
                                     throws JspException
```
    Optionally writes the supplied value under the supplied attribute name into the supplied TagWriter. In this case, the supplied value is evaluated first and then the String representation is written as the attribute value. If the resultant String representation is null or empty, no attribute is written.
    抛出:
    JspException
    另请参阅:
    TagWriter.writeOptionalAttributeValue(String, String)
  - createTagWriter
```
protected TagWriter createTagWriter()
```
    Create the TagWriter which all output will be written to. By default, the TagWriter writes its output to the JspWriter for the current PageContext. Subclasses may choose to change the Writer to which output is actually written.
  - doStartTagInternal
```
protected final int doStartTagInternal()
                                throws Exception
```
    Provide a simple template method that calls createTagWriter() and passes the created TagWriter to the writeTagContent(TagWriter) method.
    指定者:
    doStartTagInternal 在类中 RequestContextAwareTag
    返回:
    the value returned by writeTagContent(TagWriter)
    抛出:
    Exception - any exception, any checked one other than a JspException gets wrapped in a JspException by doStartTag
    另请参阅:
    TagSupport.doStartTag()
  - getDisplayString
```
protected String getDisplayString(Object value)
```
    Get the display value of the supplied Object, HTML escaped as required. This version is notPropertyEditor-aware.
  - getDisplayString
```
protected String getDisplayString(Object value,
                                  PropertyEditor propertyEditor)
```
    Get the display value of the supplied Object, HTML escaped as required. If the supplied value is not a String and the supplied PropertyEditor is not null then the PropertyEditor is used to obtain the display value.
  - isDefaultHtmlEscape
```
protected boolean isDefaultHtmlEscape()
```
    Overridden to default to true in case of no explicit default given.
    覆盖:
    isDefaultHtmlEscape 在类中 HtmlEscapingAwareTag
    另请参阅:
    RequestContextAwareTag.getRequestContext()
  - writeTagContent
```
protected abstract int writeTagContent(TagWriter tagWriter)
                                throws JspException
```
    Subclasses should implement this method to perform tag content rendering.
    返回:
    valid tag render instruction as per Tag.doStartTag().
    抛出:
    JspException

类 AbstractFormTag

字段概要

从类继承的字段 org.springframework.web.servlet.tags.RequestContextAwareTag

从类继承的字段 javax.servlet.jsp.tagext.TagSupport

从接口继承的字段 javax.servlet.jsp.tagext.IterationTag

从接口继承的字段 javax.servlet.jsp.tagext.Tag

构造器概要

方法概要

从类继承的方法 org.springframework.web.servlet.tags.HtmlEscapingAwareTag

从类继承的方法 org.springframework.web.servlet.tags.RequestContextAwareTag

从类继承的方法 javax.servlet.jsp.tagext.TagSupport

从类继承的方法 java.lang.Object

构造器详细资料

AbstractFormTag

方法详细资料

evaluate

writeOptionalAttribute

createTagWriter

doStartTagInternal

getDisplayString

getDisplayString

isDefaultHtmlEscape

writeTagContent