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JavaSercer Pages public (Xaraya web hosting) java.util.Enumeration getInitParameterNames( ) Returns the

JavaSercer Pages public java.util.Enumeration getInitParameterNames( ) Returns the names of the servlet’s or JSP page’s initialization parameters as an Enumeration of String objects, or an empty Enumeration if the servlet has no initialization parameters. public ServletContext getServletContext( ) Returns a reference to the ServletContext that the servlet or JSP page belongs to. public String getServletName( ) Returns the name of the servlet instance or JSP page. The name may be assigned in the web application deployment descriptor. For an unregistered (and thus unnamed) servlet instance or JSP page, the servlet’s class name is returned. exception Synopsis Variable Name: exception Class Name: java.lang. Throwable Extends: None Implements: java.io.Serializable Implemented by: Part of the standard Java library JSP Page Type: Available only in a page marked as an error page using the page directive isErrorPage attribute Description The exception variable is assigned to the subclass of Throwable that caused the error page to be invoked. The Throwable class is the superclass of all errors and exceptions in the Java language. Only objects that are instances of this class (or of one of its subclasses) are thrown by the Java Virtual Machine or by the Java throw statement. See the Java documentation at http://java.sun.com/docs/index.html for a description of the Throwable class. out Synopsis Variable Name: out Class Name: javax.servlet.jsp.JspWriter page 274
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J2ee hosting - JavaSercer Pages public Enumeration getServlets( ) This method

JavaSercer Pages public Enumeration getServlets( ) This method was originally defined to return an Enumeration of all the servlets known to this servlet context. As of the Servlet 2.1 API, this method always returns an empty Enumeration, and remains only to preserve binary compatibility. This method will be permanently removed in a future version of the Java servlet API. public Enumeration getServletNames( ) This method was originally defined to return an Enumeration of all the servlet names known to this context. As of the Servlet 2.1 API, this method always returns an empty Enumeration, and remains only to preserve binary compatibility. This method will be permanently removed in a future version of the Java servlet API. public void log(Exception exception, String message) This method was originally defined to write an exception’s stack trace and an explanatory error message to the web container log file. As of the Servlet 2.1 API, the recommendation is to use log(String, Throwable) instead. config Synopsis Variable Name: config Interface Name: javax.servlet. ServletConfig Extends: None Implemented by: Internal container-dependent class JSP Page Type: Available in both regular JSP pages and error pages Description A ServletConfig instance is used by a web container to pass information to a servlet or JSP page during initialization. The configuration information contains initialization parameters (defined in the web application deployment descriptor) and the ServletContext object representing the web application the servlet or JSP page belongs to. Interface Declaration public interface ServletConfig { public String getInitParameter(String name); public Enumeration getInitParameterNames( ); public ServletContext getServletContext( ); public String getServletName( ); } Methods public String getInitParameter(String name) Returns a String containing the value of the specified servlet or JSP page initialization parameter, or null if the parameter does not exist. page 273
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JavaSercer Pages public String getRealPath(String path) Returns a

JavaSercer Pages public String getRealPath(String path) Returns a String containing the filesystem path for a specified context-relative path. This method returns null if the web container cannot translate the path to a filesystem path for any reason (such as when the content is being made available from a WAR archive). public RequestDispatcher getRequestDispatcher(String path) Returns a RequestDispatcher object that acts as a wrapper for the resource located at the specified context-relative path. The resource can be dynamic (servlet or JSP) or static (for instance, a regular HTML file). public java.net.URL getResource(String path) throws MalformedURLException Returns a URL to the resource that is mapped to the specified context-relative path. This method allows the web container to make a resource available to servlets and JSP pages from other sources than a local filesystem, such as a database or a WAR file. The URL provides access to the resource content directly, so be aware that requesting a JSP page returns a URL for the JSP source code as opposed to the processed result. Use a RequestDispatcher instead to include results of an execution. This method returns null if no resource is mapped to the pathname. public java.io.InputStream getResourceAsStream(String path) Returns the resource mapped to the specified context-relative path as an InputStream object. See getResource( ) for details. public String getServerInfo( ) Returns the name and version of the servlet container on which the servlet or JSP page is running as a String with the format “servername/versionnumber” (for example, “Tomcat/3.2″). Optionally, a container may include other information, such as the Java version and operating system information, within parentheses. public void log(String message) Writes the specified message to a container log file. The name and type of the log file is container- dependent. public void log(String message, Throwable cause) Writes the specified message and a stack trace for the specified Throwable to the servlet log file. The name and type of the log file is container-dependent. public void removeAttribute(String name) Removes the attribute with the specified name from the servlet context. public void setAttribute(String name, Object attribute) Binds an object to the specified attribute name in this servlet context. If the specified name is already used for an attribute, this method removes the old attribute and binds the name to the new attribute. The following methods are deprecated: public Servlet getServlet(String name) throws ServletException This method was originally defined to retrieve a servlet from a ServletContext. As of the Servlet 2.1 API, this method always returns null, and remains only to preserve binary compatibility. This method will be permanently removed in a future version of the Java servlet API. page 272

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JavaSercer Pages public InputStream (Web hosting maine) getResourceAsStream(String path); public String

JavaSercer Pages public InputStream getResourceAsStream(String path); public String getServerInfo( ); public void log(String message); public void log(String message, Throwable cause); public void removeAttribute(String name); public void setAttribute(String name, Object attribute); // Deprecated methods public Servlet getServlet(String name) throws ServletException; public Enumeration getServlets( ); public Enumeration getServletNames( ); public void log(Exception exception, String message); } Methods public Object getAttribute(String name) Returns the servlet context attribute with the specified name, or null if there is no attribute by that name. Context attributes can be set by a servlet or a JSP page, representing the JSP application scope. A container can also use attributes to provide information that is not already available through methods in this interface. public java.util.Enumeration getAttributeNames( ) Returns an Enumeration of String objects containing the attribute names available within this servlet context. public ServletContext getContext(String uripath) Returns a ServletContext object that corresponds to a specified URI in the web container. This method allows servlets and JSP pages to gain access to contexts other than its own. The URI path must be absolute (beginning with /) and is interpreted based on the container’s document root. In a security-conscious environment, the container may return null for a given URI. public String getInitParameter(String name) Returns a String containing the value of the named context-wide initialization parameter, or null if the parameter does not exist. Context initialization parameters can be defined in the web application deployment descriptor. public java.util.Enumeration getInitParameterNames( ) Returns the names of the context’s initialization parameters as an Enumeration of String objects, or an empty Enumeration if the context has no initialization parameters. public int getMajorVersion( ) Returns the major version of the Java servlet API that this web container supports. For example, a container that complies with the Servlet 2.3 API returns 2. public String getMimeType(String filename) Returns the MIME type of the specified file, or null if the MIME type is not known. The MIME type is determined by the configuration of the web container, and may be specified in a web application deployment descriptor. public int getMinorVersion( ) Returns the minor version of the Java servlet API that this web container supports. For example, a container that complies with the Servlet 2.3 API returns 3. public RequestDispatcher getNamedDispatcher(String name) Returns a RequestDispatcher object that acts as a wrapper for the named servlet or JSP page. Names can be defined for servlets and JSP pages in the web application deployment descriptor. page 271

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JavaSercer Pages Appendix B. JSP API Reference Besides (Paypal hosting)

JavaSercer Pages Appendix B. JSP API Reference Besides the JSP elements described in Appendix A, the JSP specification also defines a number of Java classes and interfaces. Instances of some of these classes are assigned to the implicit variables available to scripting elements in a JSP page. Others are used for development of custom actions and to allow JSP container vendors to encapsulate internal implementations. This appendix describes the classes and interfaces in all these categories. B.1 Implicit Variables The JSP specification defines a number of implicit variables. Most of the implicit variables have types defined by classes and interfaces in the servlet specification’s javax.servlet.http package, but two are part of the JSP javax.servlet.jsp package and one is part of the Java core API. Scripting elements in a JSP page can use these objects to access request and response information as well as objects saved in one of the JSP scopes: page, request, session, and application. application Synopsis Variable Name: application Interface Name: javax.servlet.ServletContext Extends: None Implemented by: Internal container-dependent class JSP Page Type: Available in both regular JSP pages and error pages Description The ServletContext provides resources shared within a web application. It holds attribute values representing the JSP application scope. An attribute value can be an instance of any valid Java class. It also defines a set of methods that a JSP page or a servlet uses to communicate with its container, for example, to get the MIME type of a file, dispatch requests, or write to a log file. The web container is responsible for providing an implementation of the ServletContext interface. A ServletContext is assigned a specific URI path prefix within a web server. For example, a context could be responsible for all resources under http://www.mycorp.com/catalog. All requests that start with the /catalog request path, which is known as the context path, are routed to this servlet context. Only one instance of a ServletContext may be available to the servlets and JSP pages in a web application. If the web application indicates that it is distributable, there must be only one instance of the ServletContext object in use per application per Java Virtual Machine. Interface Declaration public interface ServletContext { public Object getAttribute(String name); public Enumeration getAttributeNames( ); public ServletContext getContext(String uripath); public String getInitParameter(String name); public Enumeration getInitParameterNames( ); public int getMajorVersion( ); public String getMimeType(String filename); public int getMinorVersion( ); public RequestDispatcher getNamedDispatcher(String name); public String getRealPath(String path); public RequestDispatcher getRequestDispatcher(String path); public URL getResource(String path) throws MalformedURLException; page 270
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JavaSercer Pages A.5 Escape Characters Since certain character

JavaSercer Pages A.5 Escape Characters Since certain character sequences are used to represent start and stop tags, you sometimes need to escape a character so the container doesn’t interpret it as part of a special character sequence. In a scripting element, if you need to use the characters %> literally, you must escape the greater-than character with a backslash: <% String msg = "Literal %> must be escaped”; %> To avoid the character sequence <% in template text being interpreted as the start of a scripting element, you must escape the percent sign: This is template text, and <% is not a start of a scriptlet. In an attribute value, you must use the following escapes: attr='a value with an escaped ' single quote' attr="a value with an escaped " double quote" attr="a value with an escaped \ backslash" attr="a value with an escaped %> scripting end tag” attr=”a value with an escaped <% scripting start tag" page 269
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Mediawiki hosting - JavaSercer Pages 5. If the object is not

JavaSercer Pages 5. If the object is not found in the specified scope, and the class attribute specifies a nonabstract class with a public no-arg constructor, a new instance of the class is created and associated with the scripting variable and with the specified name in the specified scope. After this, Step 7 is performed. If the object is not found and the specified class doesn’t fulfill the requirements, a InstantiationException is thrown. This completes the processing of the action. 6. If the object is not found in the specified scope and the beanName attribute is specified, the instantiate( ) method of the java.beans.Beans class is invoked, with the ClassLoader of the JSP implementation class instance and the beanName as arguments. If the method succeeds, the new object reference is associated with the scripting variable and with the specified name in the specified scope. After this, Step 7 is performed. 7. If the action element has a nonempty body, the body is processed. The scripting variable is initialized and available within the scope of the body. The text of the body is treated as elsewhere: any template text is passed through to the response, and scriptlets and action tags are evaluated. A common use of a nonempty body is to complete initializing the created instance; in that case, the body typically contains actions and scriptlets. This completes the processing of the action. Example: A.3.10 Custom Actions A custom action element can be developed by a programmer to extend the JSP language. The examples in this java blog use custom actions for database access, internationalization, access control, and more. They are described in Appendix C. The general syntax for custom actions is the same as for the JSP standard actions: a start tag (optionally with attributes), a body, and an end tag. Other elements and template text can be nested in the body. Here’s an example:

Web hosting bandwidth - JavaSercer Pages If the value is a string,

JavaSercer Pages If the value is a string, either in the form of a request parameter value or explicitly specified by the value attribute, it is converted to the property’s type as described in Table A.10. Table A.10, Conversion of String Value to Property Type Property Type Conversion Method boolean or Boolean Boolean.valueOf(String) byte or Byte Byte.valueOf(String) char or Character String.charAt(int) double or Double Double.valueOf(String) int or Integer Integer.valueOf(String) float or Float Float.valueOf(String) long or Long Long.valueOf(String) Example: tomcat hosting services

JavaSercer Pages hspace String No Optional. The amount (Web hosting paypal)

JavaSercer Pages hspace String No Optional. The amount of whitespace to be inserted to the left and right of the applet area, in pixels. iepluginurl String No Optional. The URL for the location of the Internet Explorer Java Plugin. The default is implementation-dependent. jreversion String No Optional. Identifies the spec version number of the JRE the component requires in order to operate. The default is 1.1. name String No Optional. The applet name, used by other applets on the same page that need to communicate with it. nspluginurl String No Optional. The URL for the location of the Netscape Java Plugin. The default is implementation-dependent. title String No Optional. Text to be rendered by the browser for the applet in a some way, for instance as a “tool tip.” type String No Mandatory. The type of object to embed, one of applet or bean. vspace String No Optional. The amount of whitespace to be inserted above and below the applet area, in pixels. width String No Optional. The width of the applet area, in pixels or percentage. Example: Plugin tag OBJECT or EMBED not supported by browser. A.3.8 The action sets the value of one or more bean properties. The attributes described in Table A.9 are supported. Table A.9, Attributes Attribute Name Java Type Request-Time Value Accepted Description name String No Mandatory. The name assigned to a bean in one of the JSP scopes. property String No Mandatory. The name of the bean’s property to set, or an asterisk (*) to set all properties with names matching request parameters. param String No Optional. The name of a request parameter that holds the value to use for the specified property. If omitted, the parameter name and the property name must be the same. value See below Yes Optional. An explicit value to assign to the property. This attribute cannot be combined with the param attribute. The property type can be any valid Java type, including primitive types and arrays (i.e., an indexed property). If a runtime attribute value is specified by the value attribute, the type of the expression must match the property’s type. page 266

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JavaSercer Pages A.3.5 The action can be used in the body of a or action to specify additional request parameters for the target resource, as well as in the body of a action to specify applet parameters. The attributes described in Table A.7 are supported. Table A.7, Attributes Attribute Name Java Type Request-Time Value Accepted Description name String No Mandatory. The parameter name. value String Yes Mandatory. The parameter value. Example: A.3.7 The action generates HTML or