JSP learning lesson 1

Code:

1. Download essential tools
2. 1. Download and install myeclipse
3. 2. Download and install Tomcat
4. Configure the development environment
5. 1. You can create a new web project (after myfirstwebproject is built, various directories and an "index. jsp" example are generated)
6. File-> New-> Project-> myeclipse-> JAVA enterprise projects-> Web project
7. 2. Configure Tomcat
8. Window-> preferences-> myeclipse-> servers-> tomcat-> Tomcat 6.x-> fill in the relevant path of your tomcat.
9. 3. Configure JDK for development
10. Myeclipse will bring its own JRE runtime environment during installation, but if the version is too low, you need to set your own JDK. Tomcat 6.x-> JDK fill in the relevant path.
11. 4. Deploy the newly created web project
12. Select the deployment button-> select the project to be deployed-> Add Server-> finsh
13. 5. Find servers in the preview of myeclipse
14. Start two services: myeclipse and tomcat.
15. 6. view the new project, open the browser and enter http: // 127.0.0.1: 8080/myfirstwebproject/to view the effect.
16. Index. jsp file content
17. The page attribute can specify some attributes of the JSP page, such as the language, the package to be used, and pageencoding.
18. <% JSP code %>
19. <%
20. String Path = request. getcontextpath ();
21. // Path indicates the folder name of the project/myfirstwebproject
22. String basepath = request. getscheme () + ": //" + request. getservername () + ":" + request. getserverport () + path + "/";
23. // Request. getscheme () obtains the protocol name: HTTP
24. // Request. getservername () obtains the IP address of the server. The local host is localhost or 127.0.0.1.
25. // Request. getserverport () returns the service port number: 8080.
26. // Basepath = "http: // 127.0.0.1: 8080/myfirstwebproject /"
27. %>
28. <Base href = "<% = basepath %>">
29. The base attribute in HTML is to set the base path of the link on the page. That is, when the path is set, basepath is added to the front by default.
30. The Web. xml configuration file is very important. Do not modify it for the moment.