how to print barcode in crystal report using vb.net Some Useful Methods of the out Object in Java

Generating Quick Response Code in Java Some Useful Methods of the out Object

Some Useful Methods of the out Object
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JSP: The Complete Reference
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Besides application-wide initialization parameters that are made available through the application object, individual servlet mappings (and, therefore, JSP pages) can have initialization parameters The config implicit object provides methods for accessing these parameters, the servlet context (application), and the servlet name, as detailed in Table 7-8
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The page implicit object is a variable containing a reference to the current servlet instance, essentially just an alias for the this variable This object is not typically useful to JSP page authors
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The object referred to by the implicit exception variable is any instance of javalangThrowable that has been thrown, but not caught, by a catch block in the JSP page The exception variable is only valid if the <%@ page %> directive has the isErrorPage="true" attribute This attribute is discussed in more detail in 10
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String getInitParameter(String name)
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Description
Returns the value of the specified servlet initialization parameter, or null, if the named parameter does not exist Returns a list of the names of all initialization parameters for this servlet Returns a reference to the servlet context (same as the application implicit variable) Returns the name of the generated servlet
Enumeration getInitParameterNames() ServletContext getServletContext()
String name getServletName()
Table 7-8
Some Useful Methods of the config Object
7:
Expressions and Scriptlets
Initialization Parameters
Initialization parameters are external name/value pairs that can be read by a JSP page They can be used in the same manner as string constants, but have the added advantage that they can be modified without requiring the program that uses them to be recompiled This makes initialization parameters especially useful for storing installation and configuration data, such as HTTP proxy server names, application color schemes, or installation directory names These parameters can be specified at the individual JSP and servlet level or for all the JSP pages in an application In either case, initialization parameters are declared in the application's webxml file4 For JSP and servlet level access, this is accomplished by adding one or more <init-param> elements to the appropriate <servlet> element, as the following shows:
<servlet> <servlet-name>Food</servlet-name> <jsp-file>/Chap07/examples/Foodjsp</jsp-file> <init-param> <param-name>DRIVER_NAME</param-name> <param-value>sunjdbcodbcJdbcOdbcDriver</param-value> </init-param> <init-param> <param-name>DATABASE_URL</param-name> <param-value>jdbc:odbc:usda</param-value> </init-param> </servlet>
ELEMENTS OF JSP
In this example, Foodjsp is a JSP page that accesses a database of nutrition information Rather than containing hardcoded values for the JDBC driver name and database URL, the JSP page gets these values from initialization parameters using the getInitParameter() method:
String driverName = getInitParameter("DRIVER_NAME"); if (driverName == null)
4 The webxml file and other configuration and deployment issues are discussed in 18
JSP: The Complete Reference
throw new ServletException ("No DRIVER_NAME parameter was specified"); String databaseURL = getInitParameter("DATABASE_URL"); if (databaseURL == null) throw new ServletException ("No DATABASE_URL parameter was specified"); ClassforName(driverName); Connection con = DriverManagergetConnection(databaseURL);
Database access parameters are likely needed in several places within a Web application Rather than having duplicate values in the webxml file, commonly used values can be specified at the application level This is done with the <context-param> element:
<context-param> <param-name>DRIVER_NAME</param-name> <param-value>sunjdbcodbcJdbcOdbcDriver</param-value> </context-param> <context-param> <param-name>DATABASE_URL</param-name> <param-value>jdbc:odbc:usda</param-value> </context-param>
The JSP code for accessing the values is almost the same, except the application object s getInitParameter() method is called:
String driverName = applicationgetInitParameter("DRIVER_NAME"); if (driverName == null) throw new ServletException ("No DRIVER_NAME parameter was specified"); String databaseURL = applicationgetInitParameter("DATABASE_URL");
7:
Expressions and Scriptlets
if (databaseURL == null) throw new ServletException ("No DATABASE_URL parameter was specified"); ClassforName(driverName); Connection con = DriverManagergetConnection(databaseURL);
Summary
JSP pages provide two means for incorporating Java code in the handling of requests: expressions and scriptlets JSP expressions are simply Java-language expressions that yield a string value (or can be converted into one) Expressions are enclosed in <%= and %> delimiters Whatever is between the delimiters is made the argument of an outprint() or outwrite() method For this reason, expressions must not end in a semicolon Scriptlets are Java code fragments designed to operate inside the _jspService() method and are marked by the <% and %> delimiters The programming statements in a scriptlet are copied directly into the Java source code of the generated servlet To give it linkage to the JSP container, a JSP page has access to a number of implict objects These are automatically initialized objects that have predefined variable names These variables are I request I response I pageContext I session I application I out I config I page I exception The last variable (exception) is only available to pages with the isErrorPage= "true" attribute in their page directive
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