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import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class HelloWorld extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
res.setContentType("text/html");
PrintWriter out = res.getWriter();
out.println("<HTML>");
out.println("<HEAD><TITLE>Hello World</TITLE></HEAD>");
out.println("<BODY>");
out.println("<BIG>Hello World</BIG>");
out.println("</BODY></HTML>");
}
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
doGet(req, res);
}
}
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
"http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">
<web-app>
<servlet>
<servlet-name>
HelloWorld
</servlet-name>
<servlet-class>
HelloWorld
</servlet-class>
</servlet>
<!--部署的第一种方式-->
<servlet-mapping>
<servlet-name>
HelloWorld
</servlet-name>
<url-pattern>
/HelloWorld
</url-pattern>
<url-pattern>
/HelloWorld.do
</url-pattern>
</servlet-mapping>
<!--方式3-->
<servlet-mapping>
<servlet-name>
HelloWorld
</servlet-name>
<url-pattern>
*.hello
</url-pattern>
</servlet-mapping>
<!--方式4-->
<servlet-mapping>
<servlet-name>
HelloWorld
</servlet-name>
<url-pattern>
/hello/*
</url-pattern>
</servlet-mapping>
</web-app>