java-Dynamic Agent

1. Code

 PackageCom.che.carcheck.ui.helper;ImportCom.che.carcheck.support.util.LogUtil;ImportJava.lang.reflect.InvocationHandler;ImportJava.lang.reflect.Method;ImportJava.lang.reflect.Proxy;/** * Proxy Mode Learning * * Yu Tianhan on 16/5/6 pm * * Public  class proxystudy {    //Usage Scenarios     Public Static void Main() {//By proxy classUserimpl Impl =NewUserimpl ("Xiao Ming");        Impl.login (); Impl.updateinfo ();//static proxyLogutil.print ("Static proxy: Start"); Userstaticproxy Staticproxy =NewUserstaticproxy (IMPL);        Staticproxy.login (); Staticproxy.updateinfo ();//Dynamic AgentLogutil.print ("Dynamic agent: Start"); Userdynamicproxyfactory factory =NewUserdynamicproxyfactory ();        User Dynamicproxy = (user) factory.createproxy (impl);        Dynamicproxy.login ();    Dynamicproxy.updateinfo (); }//Interface     Public  interface User {        voidLogin ();voidUpdateInfo (); }//By proxy class     Public Static  class Userimpl implements User {        PrivateString name; Public Userimpl(String name) { This. name = name; }@Override         Public void Login() {Logutil.print ( This. Name +"Sign in ..."); }@Override         Public void UpdateInfo() {Logutil.print ( This. Name +"Update information ..."); }    }//static proxy     Public Static  class userstaticproxy implements User {        PrivateUserimpl Countimpl; Public Userstaticproxy(Userimpl Countimpl) { This. Countimpl = Countimpl; }@Override         Public void Login() {Dobefore ();        Countimpl.login (); }@Override         Public void UpdateInfo() {Dobefore ();            Countimpl.updateinfo ();        Doafter (); }Private void Dobefore() {Logutil.print ("Static proxy: Pre-action ..."); }Private void Doafter() {Logutil.print ("Static proxy: Post-action ..."); }    }//jdk Dynamic Agent     Public Static  class userdynamicproxyfactory implements Invocationhandler {        PrivateObject Target;//Bind the delegate object and return a proxy class         PublicObjectCreateproxy(Object target) { This. target = target;//Get proxy object            returnProxy.newproxyinstance (Target.getclass (). getClassLoader (), Target.getclass (). Getinterfaces (), This);//To bind the interface (this is a flaw, cglib compensates for this flaw)}//Change the invocation logic of the method        @Override         PublicObjectInvoke(Object Proxy, Method method, object[] args)throwsthrowable {Object result =NULL;//Execution Method            if(Method.getname (). Equals ("Login")) {Dobefore ();            result = Method.invoke (target, args); }if(Method.getname (). Equals ("UpdateInfo")) {Dobefore ();                result = Method.invoke (target, args);            Doafter (); }returnResult }Private void Dobefore() {Logutil.print ("Dynamic proxy: Pre-action ..."); }Private void Doafter() {Logutil.print ("Dynamic proxy: Post-action ..."); }    }}

2. Log

java-Dynamic Agent