(2) Servlet
After completing the above steps, you still need to make some modifications to run your servlet. You need to modify two files (Web. XML, server. XML) respectively)
(1) first of all to do a good job directory problem: Find the tomcat installation directory of webapps (my c: \ Software \ tomcat6.0.16 \ webapps), create MyApp \ WEB-INF \ classes, are folders, WEB-INF capital. This classes directory is used to store your compiled. Class (that is, the servelt file you want to run)
My path is: C: \ Software \ tomcat6.0.16 \ webapps \ MyApp \ WEB-INF \ Classes
(2) Write A helloworld. Java and compile javac.
Helloworld. Java; the Code is as follows:
Import java. Io .*;
Import javax. servlet .*;
Import javax. servlet. http .*;
Public class helloworld extends httpservlet {
Public void doget (httpservletrequest request, httpservletresponse response)
Throws ioexception, servletexception
{
Response. setcontenttype ("text/html ");
Printwriter out = response. getwriter ();
Out. println ("<HTML> ");
Out. println ("Out. println ("<title> Hello world! </Title> ");
Out. println ("Out. println ("<body> ");
Out. println ("Out. println ("</body> ");
Out. println ("}
} If a compilation error occurs, use eclipse to create a new project compilation, and then add external jars to libraries in the configuration of the Project Build path to import the \ Lib \ servlet-api.jar under the tomcat installation directory, then go to the project directory bin to generate. copy the class file to the created above .. \ MyApp \ WEB-INF \ Classes \ directory
(3) (to modify the Web. xml file)
Copy the Web. xml file under the conf directory under the Tomcat directory to the directory of the new .. \ MyApp \ WEB-INF, open it with notepad, and add the following content:
The code added is as follows: (The helloworld is the name of the. Class file just compiled. You can modify it as needed)
<? XML version = "1.0" encoding = "ISO-8859-1"?>
<! Doctype web-app
Public "-// Sun Microsystems, Inc. // DTD web application 2.3 // en"
Http://java.sun.com/dtd/web-app_2_3.dtd>
<Web-app>
<Display-Name> welcome to Tomcat </display-Name>
<Description>
Welcome to Tomcat
</Description>
<Servlet>
<Servlet-Name> helloworld </servlet-Name>
<Servlet-class> helloworld </servlet-class>
</Servlet>
<Servlet-mapping>
<Servlet-Name> helloworld </servlet-Name>
<URL-pattern>/helloworld </url-pattern>
</Servlet-mapping>
</Web-app>
(4) (modify the server. xml file) --- skip this step
Use NotePad to open the server. xml file under the Tomcat directory \ conf
Find the following content:
<Context Path = "/Examples" docbase = "Examples" DEBUG = "0"
Reloadable = "true" crosscontext = "true">
Modify as follows:
<Context Path = "/MyApp" docbase = "MyApp" DEBUG = "0"
Reloadable = "true" crosscontext = "true">
/MyApp refers to the new working directory.
Save the changes.
(3)
The next step is to run servelt to pull and start Tomcat (startup. BAT), open the browser, enter http: // localhost: 8080, add the working directory name MyApp, And the Servlet File Name (that is, compiled. class file)
Full path: http: // localhost: 8080/MyApp/helloworld
Hello world! Easy to use
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