Interpret the source code of the hessian framework in the Java library
The HESSIAN framework is a Java class library for remote method calls (RMI).It realizes more efficient remote communication by serializing Java objects into binary streams and transmitting between clients and servers.
The source code of the Hessian framework mainly includes the following key parts:
1. HessianServlet: HessianServlet is a Servlet class that is used to receive the client's HTTP request and forward the request to the corresponding remote service.It is implemented by inheriting javax.servlet.http.httpservlet and rewritten the dopost () method.The following is an example:
public class MyHessianServlet extends HessianServlet {
private MyRemoteService remoteService;
public MyHessianServlet() {
remoteService = new MyRemoteServiceImpl();
}
@Override
public void init() throws ServletException {
super.init();
// Initialize remote service objects
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
super.doPost(req, resp);
// Process remote method call request
}
}
2. HessianProxyFactory: HessianProxyFactory is a factory class used to create hessian agent objects.By using the hessianproxyFactory, the client can easily create proxy objects and call the method provided by remote services.The following is an example:
public class MyClient {
public static void main(String[] args) {
String url = "http://localhost:8080/my-hessian-servlet";
HessianProxyFactory factory = new HessianProxyFactory();
try {
MyRemoteService remoteService = (MyRemoteService) factory.create(MyRemoteService.class, url);
// Call the remote method
remoteService.doSomething();
} catch (MalformedURLException e) {
e.printStackTrace();
}
}
}
3. Hessianserializer: Hessianserializer is a serializer in the Hessian framework, which is used to sequence the Java object into binary streams.It provides a variety of serialization methods, such as serialization of basic types, serialization of a collection class.The following is an example:
public class MyObject implements Serializable {
private String name;
private int age;
// Eliminate the constructor, Getter, and Setter method
private void writeObject(ObjectOutputStream out) throws IOException {
ObjectOutputStream.PutField fields = out.putFields();
fields.put("name", name);
fields.put("age", age);
out.writeFields();
}
private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
ObjectInputStream.GetField fields = in.readFields();
name = (String) fields.get("name", null);
age = fields.get("age", 0);
}
}
By interpreting the Hessian framework source code, we can better understand its principles and implementation methods.At the same time, we can also customize and expand according to the actual needs of the source code to meet specific business needs.
