jsp vs servlet

　Previously, I was puzzled by the problem of the jump path between the servlet and servlet/jsp, and today I did a hands-on experiment and summarized the following:The servlet is already a resource under the project root path, so when the servlet jumps, it can be added "/" on

Cookie,servlet container with SessionID gets the SessionID in this HTTP request. The SessionID is generated in 1, so the servlet container considers the request to be in the same session as the last request, and the servlet container does not create a new HttpSession object, but is based on the SessionID in the cookie. Locate the HttpSession object that correspo

JSP is the essence of the servlet, the developer's JSP file will be compiled by the Web container into the corresponding servlet, when the servlet is running in the container, the creation and destruction of its instance is not determined by the programmer, but by the Web co

One, the need for MVC Separates the code that creates and operates data from the code that expresses the data. JSP separates most of the performance content from the dynamic content. And the servlet handles business logic.The servlet is responsible for processing the initial request, locating the data, storing the results in the bean, and then forwarding the requ

1. requestdispatcher. Forward () Is used on the server. When forward () is used, the servlet engine transmits the HTTP request from the current servlet or JSP to another servlet, JSP or common HTML file, that is, your form is submitted to.

In Web server-side programming, session state management is an important issue that must be considered frequently. This paper analyzes the session management mechanism of Jsp/servlet and the problems it faces, and then proposes an improved session management method. First, the servlet session management mechanism HTTP is a stateless protocol, according to the d

1. DAO pattern subcontracting: Set up sequentiallyEntity package, which is the property of the object that corresponds to the table structure in the Oracle database, that is, what is the objectDAO: Adding and deleting the interface, realizing the specific method of adding and removing and checkingService: With DAO, is also an interface, an interface implementation class, methods and so on the same as DAOServlet: Create a new servlet class, inherit the

The paths in Jsp,servlet and HTML are basically relative paths, except that they differ from the root path of the relative path.The following are examples of the servelt and JSP paths used:The servlet path is:http://localhost:8080/testProject/hello/testThe JSP path is:http:/

1. RequestDispatcher. forward () Is used on the server. When forward () is used, the Servlet engine transmits the HTTP request from the current Servlet or JSP to another Servlet, JSP or common HTML file, that is, your form is submitted to.

The review of Jsp/servlet technology is as follows 1. Requestdispatcher.forward () is on the server side, when using forward (), the Servlet engine passes HTTP requests from the current servlet or JSP to another servlet,

This article discusses JavaBean. In the previous servlet JSP events (12), we wrote a simple message board, but there are some problems in this small project. For example, we include a large number of Java code in the JSP page, which is fine for small projects, but for large projects, if the page editor accidentally deletes some java code, an error occurs. Java p

or request. setcharacterencoding ("GBK"); also, the problem lies in the method for passing the processing parameters: If doget (httpservletrequest request, httpservletresponseIf the response method is used for processing, the preceding statements are written as follows:Request. setcharacterencoding ("GBK ");Response. setcontenttype ("text/html; charset = GBK ");It does not work either. The returned Chinese characters are still garbled !!! If you change this function to dopost (httpservletreques

Introduction of each module of the servlet program1.JSP the part that is used to display and collect data.2.Servlet for validating data, instantiating JavaBean, invoking DAO Connection database, controlling page jumps3.DAO for connection to database and database operations such as: query, delete, change, etc.4.JavaBean for data encapsulation, easy to transfer que

The redirection Technology of JSP/Servlet is summarized as follows:1. RequestDispatcher. forward ()Is used on the server. When forward () is used, the Servlet engine transmits the HTTP request from the current Servlet or JSP to another S