[Java] Java动态代理的两种实现方式详解【附相关jar文件下载】

public interface userservice {
  public string getname(int id);
  public integer getage(int id);
}
public class userserviceimpl implements userservice {
  @override
  public string getname(int id) {
  system.out.println("------getname------");
  return "tom";
  }
  @override
  public integer getage(int id) {
  system.out.println("------getage------");
  return 10;
  }
}

public class userinvocationhandler implements invocationhandler {
  private object target;
  userinvocationhandler() {
  super();
  }
  userinvocationhandler(object target) {
  super();
  this.target = target;
  }
  @override
  public object invoke(object o, method method, object[] args) throws throwable {
  if("getname".equals(method.getname())){
    system.out.println("++++++before " + method.getname() + "++++++");
    object result = method.invoke(target, args);
    system.out.println("++++++after " + method.getname() + "++++++");
    return result;
  }else{
    object result = method.invoke(target, args);
    return result;
  }
  }
}

public class m {
  public static void main(string[] args) {
  userservice userservice = new userserviceimpl();
  invocationhandler invocationhandler = new userinvocationhandler(userservice);
  userservice userserviceproxy = (userservice) proxy.newproxyinstance(
    userservice.getclass().getclassloader(),
    userservice.getclass().getinterfaces(),
    invocationhandler);
  system.out.println(userserviceproxy.getname(1));
  system.out.println(userserviceproxy.getage(1));
  }
}

public class cglibmethodinterceptor implements methodinterceptor {
  @override
  public object intercept(object o, method method, object[] args, methodproxy methodproxy) throws throwable {
  system.out.println("------before " + methodproxy.getsupername() + "------");
  object o1 = methodproxy.invokesuper(o, args);
  system.out.println("------after " + methodproxy.getsupername() + "------");
  return o1;
  }
}

public class m {
  public static void main(string[] args) {
  cglibmethodinterceptor cglibproxy = new cglibmethodinterceptor();
  enhancer enhancer = new enhancer();
  enhancer.setsuperclass(userserviceimpl.class);
  enhancer.setcallback(cglibproxy);
  userservice o = (userservice) enhancer.create();
  o.getname(1);
  o.getage(1);
  }
}