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用myeclipse建立web项目，编写servlet。部署后，启动Tomcat服务器。
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class HelloServlet extends HttpServlet {//继承HTTPServlet
public void doGet(HttpServletRequest request, HttpServletResponse response)//重新定义doGet
throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");//设置响应内容类型器
PrintWriter out = response.getWriter();//取得响应输出对象
String text = request.getParameter("text");//取得请求参数
out.println("<HTML>");
out.println(" <HEAD><TITLE>Hello Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.println("<h1>" + text + "!</h1>");
out.println(" </BODY>");
out.println("</HTML>");
out.close();
}
}URL带上请求参数。
http://localhost:8080/FirstServlet/servlet/HelloServlet?text=HelloWorld
运行结果：