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

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JavaSercer Pages A.5 Escape Characters Since certain character

Java — Wed, 31 Jan 2007 17:30:27 +0000

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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Java — Wed, 31 Jan 2007 12:17:47 +0000

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:

<%= current %> The tag library containing the custom actions must be declared by the taglib directive, assigning a prefix for the custom action elements (ora in this example) before a custom action can be used in a JSP page. A.4 Comments You can use JSP comments in JSP pages to describe what a scripting element or action is doing: <%-- This is a comment --%> All text between the start and stop tags is ignored by the JSP container and is not included in the response. The comment text can be anything except the character sequence representing the closing tag: –%>. Besides describing what’s going on in the JSP page, comments can also be used to “comment out” portions of the JSP page, for instance during testing: <%-- servlet hosting services

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

Java — Wed, 31 Jan 2007 04:07:22 +0000

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

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

Java — Tue, 30 Jan 2007 22:31:42 +0000

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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Java — Tue, 30 Jan 2007 15:30:00 +0000

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 elements (depending on the browser type) that result in the download of the Java Plugin software (if required) and subsequent execution of the specified Java Applet or JavaBeans component. The body of the action can contain a element to specify applet parameters, and a element to specify the text shown in browsers that do not support the or HTML elements. For more information about the Java Plugin, see http://java.sun.com/products/plugin/. The attributes described in Table A.8 are supported. Table A.8, Attributes Attribute Name Java Type Request- Time Value Accepted Description align String No Optional. Alignment of the applet area. One of bottom, middle, or top. archive String No Optional. A comma-separated list of URIs for archives containing classes and other resources that will be preloaded. The classes are loaded using an instance of an AppletClassLoader with the given codebase. Relative URIs for archives are interpreted with respect to the applet’s codebase. code String No Mandatory. The fully qualified class name for the object. codebase String No Mandatory. The relative URL for the directory that contains the class file. The directory must be a subdirectory to the directory holding the page, according to the HTML 4.0 specification. height String No Optional. The height of the applet area, in pixels or percentage. page 265
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JavaSercer Pages The action supports the attributes described (Music webhost)

Java — Tue, 30 Jan 2007 08:25:55 +0000

JavaSercer Pages The action supports the attributes described in Table A.4. Table A.4, Attributes Attribute Name Java Type Request-Time Value Accepted Description Page String Yes Mandatory. A page-relative or context-relative URI path for the resource to forward to. Example: A.3.3 The action adds the value of a bean property, converted to a string, to the response generated by the page. The attributes described in Table A.5 are supported. Table A.5, 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 include in the page. Example: A.3.4 The action includes the response from another JSP page, servlet, or static file in the same web application. The execution of the current page continues after including the response generated by the target resource. If any response content has been buffered when the action is executed, the buffer is flushed first. Even though this behavior can be controlled by the flush attribute, the only valid value in JSP 1.1 is true. This limitation will likely be lifted in a future version of JSP. The URI path information available through the implicit request object reflects the URI path information for the source JSP page even in the target resource. All other request information is also left untouched, so the target resource has access to all the original parameters and headers passed with the request. Additional parameters can be passed to the target resource through elements in the element’s body. The action supports the attributes described in Table A.6. Table A.6, Attributes Attribute Name Java Type Request-Time Value Accepted Description page String Yes Mandatory. A page-relative or context-relative URI path for the resource to include. flush boolean No Mandatory in JSP 1.1 with true as the only accepted value. Example: page 264
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Java — Tue, 30 Jan 2007 00:32:42 +0000

JavaSercer Pages A.3 Action Elements Actions are executed when the JSP page is requested by a client. They are inserted in a page using XML element syntax, and encapsulate functionality such as input validation using beans, database access, or passing control to another page. The JSP specification defines a few standard action elements, described in this section, and also includes a framework for developing custom action elements. An action element consists of a start tag (optionally with attributes), a body, and an end tag. Other elements can be nested in the body. Here’s an example: If the action element doesn’t have a body, a shorthand notation can be used in which the start tag ends with /> instead of >, as shown by the action in this example. The action element name and attribute names are case-sensitive. Some action attributes accept a request-time attribute value, using the JSP expression syntax: <% String headerPage = currentTemplateDir + "/header.jsp"; %> Plugin tag OBJECT or EMBED not supported by browser. A.3.2 The action passes the request processing control to another JSP page or servlet in the same web application. The execution of the current page is terminated, giving the target resource full control over the request. If any response content has been buffered when the action is executed, the buffer is cleared first. If the response has already been committed (i.e., partly sent to the browser), the forwarding fails with an IllegalStateException. The URI path information available through the implicit request object is adjusted to reflect the URI path information for the target resource. All other request information is left untouched, so the target resource has access to all the original parameters and headers passed with the request. Additional parameters can be passed to the target resource through elements in the element’s body. page 263
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JavaSercer Pages A.2 Scripting Elements Scripting elements let (Godaddy web hosting)

Java — Mon, 29 Jan 2007 16:39:58 +0000

JavaSercer Pages A.2 Scripting Elements Scripting elements let you add small pieces of code to a JSP page, such as an if statement that generates different HTML depending on some condition. The scripting code must be written in the language defined by the page directive. It is executed when the JSP page is requested. A.2.1 Declaration A declaration starts with <%! and ends with %>. The content between the start and the end characters must be a complete, valid declaration in the scripting language defined by the page directive. The JSP implicit variables are not visible in a declaration element. A declaration can be used to declare a scripting language variable or method. When the scripting language is Java, a variable declared by a declaration element ends up as an instance variable in the JSP page implementation class. It is therefore visible to parallel threads (requests) processing the page, and needs to be handled in a thread-safe manner. A thread-safe alternative is to declare variables within a scriptlet element instead. It then becomes a local variable of the method in the page implementation class used to process each request, and is not shared by parallel threads. Example: <%! int globalCounter = 0; %> A.2.2 Expression An expression starts with <%= and ends with %>. The content between the start and the end characters must be a complete, valid expression in the scripting language defined by the page directive that results in or can be converted to a string. All JSP implicit variables are visible in an expression element. Example: <%= globalCounter++ %> A.2.3 Scriptlet A scriptlet starts with <% and ends with %>. The content between the start and the end characters must be a code fragment in the scripting language defined by the page directive. Scriptlet code fragments are combined with code for sending the template data between them to the browser. The combination of all scriptlets in a page must form valid scripting language statements. All JSP implicit variables are visible in a scripting element. Example: <% java.util Date clock = new java.util.Date( ) %> <% if (clock.getHours( ) < 12) { %> Good morning! <% } else if (clock.getHours( ) < 17) { %> Good day! <% } else { %> Good evening! <% } %> page 262
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JavaSercer Pages import No default A Java import (Video web hosting)

Java — Mon, 29 Jan 2007 11:15:22 +0000

JavaSercer Pages import No default A Java import declaration, i.e., a comma-separated list of fully qualified class names or package names followed by .* (for all public classes in the package). info No default Text that a web container may use as a description of the page in its administration user interface. isErrorPage false Set to true for a page that is used as an error page, to make the implicit exception variable available to scripting elements. Use false for regular JSP pages. isThreadSafe true Set to true if the container is allowed to run multiple threads through the page (i.e., lets the page serve parallel requests). If set to false, the container serializes all requests for the page. It may also use a pool of page implementation class instances to serve more than one request at a time. The recommendation is to always use true, and handle multithread issues by avoiding JSP declarations and ensuring that all objects used by the page are thread-safe. language java Defines the scripting language used in the page. session true Set to true if the page should participate in a user session. If set to false, the implicit session variable is not available to scripting elements in the page. A translation unit (the JSP source file and any files included via the include directive) can contain more than one page directive, as long as there is only one occurrence of an attribute, with the exception of the import attribute. If multiple import attribute values are used, they are combined into one list of import definitions. Example: <%@ page language="java" contentType="text/html;charset=Shift_JIS"%> <%@ page import="java.util.*, java.text.*" %> <%@ page import="java.sql.Date" %> A.1.3 taglib Directive Declares a tag library, containing custom actions, that is used in the page. The taglib directive supports the attributes described in Table A.3. Table A.3, taglib Directive Attributes Attribute Name Default Description prefix No default Mandatory. The prefix to use in the action element names for all actions in the library. uri No default Mandatory. Either a symbolic name for the tag library defined in the web.xml file for the application, or a page-relative or context-relative URI path for the library’s TLD file or JAR file. Example: <%@ taglib uri="/orataglib" prefix="ora" %> page 261
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