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This tutorial lists down the API’s used in the Java Server Pages (JSP) programming. API stands for Application Programming Interface that allows programmers for building software applications in java. JSP API is categorized into following packages:
| Packages | Description |
|---|---|
| javax.el | It provides classes and interfaces used by JSP to evaluate expressions. |
| javax.servelt.jsp | It contains classes and interfaces that describe JSP page implementation. |
| javax.servlet.jsp.el | It contains classes ang interfaces that define JSP page implementation supported by JSP container. |
| javax.servlet.jsp.tagext | It is used to define tag libraries which means for identifying custom tags in JSP page. |
Following sections will detail about classes and interfaces in each of the above packages:
Package javax.servlet.jsp
It contains classes and interfaces that describe JSP page implementation.
Interfaces
| Interface | Description |
|---|---|
| JspPage | It contains interaction of JSP page implementation.JspPage page has following methods :
|
| HttpJspPage | It contains interaction of JSP page implementation with HTTP protocol.It has method called _jspService used to process user request. |
Classes
| Class | Description |
|---|---|
| JsPWriter | It is used to display contents/output in JSP page. |
| JspError | It is used to display errors on error pages. |
| JspContext | It collects information which is not a part of servlets. |
| JspEngineInfo | It gives information of current JSP engine. |
| JspFactory | It defines classes and interfaces to use JSP page implementation. |
| JspException | It is used to display exceptions occurred in JSP pages. |
Package javax.el
This package has classes and interfaces for the expression language definitions.
Interfaces
| Interface | Description |
|---|---|
| ELContextListener | It is used for receiving notification. |
Classes
| Classes | Description |
|---|---|
| ArrayELResolver | Performs property resolution on arrays. |
| BeanELResolver | Performs property resolution on JavaBeans. |
| CompositeELResolver | It can be used as stop condition for iterating its component resolvers. |
| ELContext | Stores state of EL expressions. |
| ELContextEvent | Indicates ELContext has been created. |
| ELResolver | Defines resolution rules to resolve EL expressions. |
| ELUtil | Defines utility methods for EL implementation. |
| Expression | It is base class for ValueExpression and Method Expression. |
| Expressionfactory | It is used to convert string into value or method expressions. |
| FunctionMapper | It is used to map function names and methods. |
| ListELResolver | Performs property resolution on objects of List class. |
| MapELResolver | Performs property resolution on objects of map class. |
| MethodExpression | It is used to parse expressions to method. |
| MethodInfo | It defines information about Method Expression. |
| ResourceBundleELResolver | Performs property resultion on objects of ResourceBundle class. |
| ValueExpression | It is used to parse expressions to value. |
| VariableMapper | It is used map between expressions and variables. |
Exceptions
| Exception Name | Description |
|---|---|
| ELException | Represents the exceptions occurred during evaluation of expressions. |
| MethodNotFoundException | It returns exception when method could not found while evaluating expressions. |
| PropertyNotFoundException | It returns exception when property could not found while evaluating expressions. |
| PropertyNotWritableException | It returns exception when property could not written to value on a ValueExpression. |
Package javax.servlet.jsp.el
Interfaces
| Interface Name | Description |
|---|---|
| FunctionMapper | It is used to map between function names and methods. |
| VariableResolver | it is used to resolve references of variables at evaluation time. |
Classes
| Class Name | Description |
|---|---|
| Expression | It is base class for Value Expression and Method Expression. |
| ExpressionEvaluator | It is used to evaluate variables and expressions at run time. |
| ImplicitObjectElResolver | It describes behavior of implicit objects in JSP specification. |
| ImplicitObjectELResolver.EnumeratedMap | It provides enumeration of keys and getValue method. |
| ImplicitObjectElResolver.implicitObjects | it is used to create implicit map and list objects. |
| ScopedAttributeELResolver | It performs property resolution on scoped attributes. |
Exceptions
| Exception name | Description |
|---|---|
| ELException | It represents exceptions that occurred during expression evaluation. |
| ELParseException | It represents parsing exceptions occurred during expression evaluation. |
Package javax.servlet.jsp.tagext
This package has classes and interfaces for writing the custom tags.
Interfaces
| Interface Name | Description |
|---|---|
| BodyTag | It includes contents of evaluating body. |
| DynamicAttributs | A tag must implement this interface to define dynamic attributes. |
| iterationTag | It is used to control re-evaluation of body. |
| JspIdConsumer | It defines ID for user provided by compiler. |
| JspTag | It provides base class for tag and Simpletag. |
| SimpleTag | It defines interface for simple tag handlers. |
| tag | it does not manipulate its body. |
| TryCatchFinally | It provides extra methods to manage resources. |
Classes
| Class Name | Description |
|---|---|
| BodyContent | It is a subclass of JspWriter. It has methods to convert its contents into a String, to read its contents, and to clear the contents. |
| BodyTagSupport | It implements the BodyTag interface and we can add additional functionalities to set property of bodyContent . |
| FunctionInfo | It provides information in TagLibrary.This class is instantiated from the Tag Library Descriptor file (TLD) and is available only at translation time. |
| Jspfragment | It is an object that represents JSP code. |
| PageData | It provides information on a JSP page. |
| SimpletagSupport | It is used as base class for simple tag handlers. It adds additional methods for the properties in SimpleTag. |
| TagAdapter | It is used to allow collaboration between classic Tag handlers and SimpleTag handlers. |
| TagAttributeInfo | It provides information on attributes of a tag. |
| TagData | It gives value information for a tag instance only at translation time. |
| TagExtraInfo | It is used to describe additional information which is not defined in TLD( Tag Library Descriptor)file. |
| TagFileInfo | It provides information for a tagfile in TagLibrary only at translation time. |
| TagInfo | It provides information for a tag in TagLibrary only at translation time. |
| TagLibrarynfo | It provides information associated with a taglib directive. |
| TagLibraryValidator | It is validator class for a JSP page and operates on the XML view associated with the JSP page. |
| TagSupport | It is base class for defining new tag handlers. |
| TagVariableInfo | It provides variable information for a tag in Tag Library only at translation time. |
| ValidationMessage | It display validation message from either TagLibraryValidator and TagExtraInfo. |
| VariableInfo | It provides information on scripting variables that are created or modified at run time. |
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