Java JSP FAQ: Answers to your questions

Java JSP is one of the commonly used technologies in Web development, but it often encounters various problems in practical applications. PHP editor Xiaoxin has compiled common questions about Java JSP for you and provided detailed answers to help you solve your doubts and better apply them in project development. From JSP basics to advanced techniques, you can easily cope with the challenges encountered during the development process.

Question 2: What is the difference between JSP and Servlet?

A Servlet is an independent component of a Java application that handles client requests and generates dynamic responses. JSP is based on Servlet technology, but it allows developers to create web pages using plain text html/XML code and embedded Java code.

Question 3: How to create a JSP page?

To create a JSP page, you need to use a file containing the .jsp extension. A JSP page consists of static HTML/XML code and JSP elements such as <% %> (for Java code) and <%@ %> (for directives).

Question 4: How to use Java code in JSP?

Use the <% %> tag to embed Java code in the JSP page. This allows developers to perform various tasks such as:

• Access and modify request and response objects
• Execute business logic
• AccessDatabase

Question 5: How to use Expression Language (EL) in JSP?

EL is the built-in language in JSP for accessing and manipulating various objects. Using the ${ } syntax, developers can access:

• Variables and objects in page scope
• Request and response objects
• Custom beans and other Java objects

Question 6: How to use JSTL tags in JSP?

JSTL (JavaServer Pages Standard Tag Library) provides a set of standard tags for common tasks, such as:

• Iteration
• Conditional Check
• Formatted output

Question 7: How to handle exceptions in JSP?

You can use the built-in error page mechanism to handle exceptions in JSP pages. Developers can specify custom error pages for specific exceptions by configuring the WEB.xml file.

Question 8: How to improve the performance of JSP pages?

Methods to improve JSP page performance include:

• Reduce the use of Java code
• Cache JSP page
• Use servlet filter for request preprocessing
• OptimizationDatabaseQuery

Question 9: How to use JSP to interact with the database?

There are several ways to interact with a database using JSP, for example:

• JDBC（Java Database Connectivity）
• JPA（Java Persistence api）
• Hibernate

Question 10: How to create a dynamic menu using JSP?

You can use JSP, EL and JSTL tags to create dynamic menus. By getting menu items from a database or other data source, developers can dynamically generate menus and present them to users.

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