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JSP: The Complete Reference
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I The session API The servlet engine can create an HttpSession object that acts as a repository for named objects that persist between requests from the same client in the same application The client remembers the ID of the session either with cookies or URL rewriting The servlet engine determines which of these techniques the client accepts and adjusts accordingly Sessions can be shut down programmatically or they can time out according to a configurable period of inactivity The session API provides a means for objects to know when they have been bound or unbound from a session JSP pages, because they run in a pure Java environment, have full access to Java s support for multithreaded applications This chapter discusses basic thread concepts, such as how to create, start, and synchronize them, and then considers the two servlet threading models Two examples of Web applications using multiple threads are presented Even though dynamic content wasn t planned for in the original HTTP protocol, the protocol has proved to be quite capable of extension Building on this flexibility, the session API provides the framework for making HTTP work in the Web application environment
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JSP: The Complete Reference
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reat advances in hardware and electronics technology have been made possible by component engineering Instead of starting with bare circuits, engineers can assemble tested modules in novel ways to create higher-level functionality Component-based programming extends this idea to the realm of software In the Java world, this means JavaBeans This chapter describes the JavaBeans programming model and how beans surface their properties to classes that use them It explains the interface provided for using beans in a JSP page The chapter concludes with a complete example illustrating the operation of a customizable weather-reporting bean in a JSP page
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The definition of a bean is purposely broad A bean is simply a Java class that meets two requirements: I It has a zero-argument constructor I It implements Serializable or Externalizable to make it persistent By this definition, most classes are already beans or can be converted with little effort No required context for running beans exists other than the Java virtual machine This allows properly constructed beans to be used in any Java environment applets, servlets, JSP pages, or standalone Java applications
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In addition, most beans have properties Properties are attributes of the bean for which the bean provides read and/or write methods All access to the bean s properties must be done through these methods; the underlying data field (if there is one) is private Part of the JavaBeans programming model is the naming convention used for these methods Unless you make special provision through a BeanInfo class, the read method for a property is a public method named get<PropertyName>(), where <PropertyName> is the name of the property with the first letter converted to uppercase Similarly, the write method, if there is one, is named set<PropertyName>() The following example is a JavaBean named Mortgage, which encapsulates the parameters that describe a mortgage loan:
package jspcrbeansmortgage; import javaio*; public class Mortgage implements Serializable { private double principal;
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JSP and JavaBeans
private double rate; private int term; /** * Returns the principal */ public double getPrincipal() { return principal; } /** * Sets the principal * @param principal the principal */ public void setPrincipal(double principal) { thisprincipal = principal; } /** * Returns the annual interest rate */ public double getRate() { return rate; } /** * Sets the interest rate * @param rate the annual interest rate as a percentage */ public void setRate(double rate) { thisrate = rate; } /** * Returns the term in months */ public int getTerm() { return term;
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