📄 helloservlet.java
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package web;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.*;import org.ozoneDB.ExternalDatabase;import db.Hello;public class HelloServlet extends HttpServlet { private ExternalDatabase db; public Hello hello; public static final String OBJ_NAME = "hej"; public void init() throws ServletException { try { System.out.println("[HelloServlet] connecting to ozone..."); db = ExternalDatabase.openDatabase("ozonedb:remote://localhost:3333"); System.out.println("[HelloServlet] Connected!"); db.reloadClasses(); System.out.println("[HelloServlet] Classes reloaded"); } catch (Exception e) { e.printStackTrace(); } } public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String message; try { hello = (Hello) db.objectForName("hej"); if (hello == null) { message = "<html> <head> </head> <body>No Hello object named 'hej' found!</body> </html>"; System.out.println("[HelloServlet] Hello object not found, run HelloManager first!"); } else { message = "<html> <head> </head> <body> " + hello.getGreeting() + "</body> </html>"; System.out.println("[HelloServlet] Successfully used object"); } } catch (Exception e) { System.out.println("[HelloServlet] Can't connect to ozone." + e.toString()); e.printStackTrace(); message = "<html> <head> </head> <body> " + e.toString() + "</body> </html>"; } PrintWriter out = response.getWriter(); System.out.println("[HelloServlet] Sending the following resonse back to client: " + message); out.println(message); out.flush(); out.close(); } public void destroy() { System.out.println("[HelloServlet] closing db"); try { db.close(); } catch (Exception e) { e.printStackTrace(); } }}⌨️ 快捷键说明
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