Applet – 服务器通信，我该怎么办呢？

我有一个applet，我必须向Web应用程序发送请求，以从数据库中的服务器获取数据。 我正在使用对象，服务器响应对象非常有用!!

applet如何与服务器通信？

我认为Web服务方法，RMI和……让我开心，但哪个最好又可靠？

Answer 1

只要您的applet与服务器通信，您就可以使用序列化对象。 您只需要在applet jar和服务器上维护相同版本的对象类。 它不是最开放或可扩展的方式，但它在开发时间和相当稳固方面很快。

这是一个例子。

实例化与servlet的连接

URL servletURL = new URL(""); URLConnection servletConnect = servletURL.openConnection(); servletConnect.setDoOutput(true); // to allow us to write to the URL servletConnect.setUseCaches(false); // Write the message to the servlet and not from the browser's cache servletConnect.setRequestProperty("Content-Type","application/x-java-serialized-object"); 

获取输出流并编写对象

 MyCustomObject myObject = new MyCustomObject() ObjectOutputStream outputToServlet; outputToServlet = new ObjectOutputStream(servletConnection.getOutputStream()); outputToServlet.writeObject(myObject); outputToServlet.flush(); //Cleanup outputToServlet.close(); 

现在阅读回复

 ObjectInputStream in = new ObjectInputStream(servletConnection.getInputStream()); MyRespObject myrespObj; try { myrespObj= (MyRespObject) in.readObject(); } catch (ClassNotFoundException e1) { e1.printStackTrace(); } in.close(); 

在你的servlet中

 public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { MyRespObject myrespObj= processSomething(request); response.reset(); response.setHeader("Content-Type", "application/x-java-serialized-object"); ObjectOutputStream outputToApplet; outputToApplet = new ObjectOutputStream(response.getOutputStream()); outputToApplet.writeObject(myrespObj); outputToApplet.flush(); outputToApplet.close(); } private MyRespObject processSomething(HttpServletRequest request) { ObjectInputStream inputFromApplet = new ObjectInputStream(request.getInputStream()); MyCustomObject myObject = (MyCustomObject) inputFromApplet.readObject(); //Do Something with the object you just passed MyRespObject myrespObj= new MyRespObject(); return myrespObj; } 

请记住，您传递的两个对象都需要实现可序列化

  public Class MyCustomObject implements java.io.Serializable {