(full of hard goods) Spring in-depth study of an IOC implementation

The IOC implements the reflection mechanism based on the underlying reflection mechanism of Java: Core: Class CLS = Class.forName (class name);
Class ptypes[] = new CLASS[2];
Ptypes[0] = Class.forName ("java.lang.String");
PTYPES[1] = Class.forName ("java.util.Hashtable");
parameter invocation Emphasis must specify the method name, and the corresponding number and type of arguments
method = Cls.getmethod ("TestMethod", ptypes); How to know the number of parameter types: Method []m= cls.getmethods ();
if (M!=null &&m.length>0)
{
for (int i = 0; i < m.length; i++) {
if (M[i].getname (). Equals ("TestMethod")) {
Parameter []p=m[i].getparameters ();
if (p!=null && p.length>0)
{
for (Parameter parameter:p) {
System.out.println (Parameter.gettype (). GetName ());
}
}
}
}
} How to invoke: Object args[] = new OBJECT[2];
Args[0] = "Hello, my dear!";
Hashtable<string, string> ht = new hashtable<string, string> ();
Ht.put ("name", "pistachio");
ARGS[1] = HT;
String returnstr = (string) method.invoke (new Reflectiontest (), args);
System.out.println ("returnstr=" + returnstr); Example:

Package com.gillion.javaReflection; Import Java.awt.Button; Import Java.lang.reflect.Method; Import Java.lang.reflect.Parameter; Import java.util.Hashtable; /** * @Description The reflection mechanism of Java * @author[email protected] * @time January 8, 2015 4:53:24 * @version 1.0.0 */ public class Reflectiontest { /** * Entrance * @param args * @throws Exception */ public static void Main (string[] args) throws Exception { Reflectiontest reflection = new Reflectiontest (); Reflection.getnametest (); System.out.println (""); Reflection.getmethodtest (); } /** * Get class name full path * @throws Exception */ public void Getnametest () throws Exception { System.out.println ("===========begin getnametest============"); String name = "a Honey fruit"; Class cls = Name.getclass (); System.out.println ("String class Name:" + cls.getname ()); Button btn = New button (); Class Btnclass = Btn.getclass (); System.out.println ("button class Name:" + btnclass.getname ()); Class Superbtnclass = Btnclass.getsuperclass (); System.out.println ("button's parent class name:" + superbtnclass.getname ()); Class clstest = Class.forName ("Java.awt.Button"); System.out.println ("Clstest name:" + clstest.getname ()); System.out.println ("===========end getnametest============"); } public void Getmethodtest () throws Exception { System.out.println ("===========begin getmethodtest=========="); Class cls = Class.forName ("Com.gillion.javaReflection.ReflectionTest"); Class ptypes[] = new CLASS[2]; Ptypes[0] = Class.forName ("java.lang.String"); PTYPES[1] = Class.forName ("java.util.Hashtable"); Parameter invocation method = Cls.getmethod ("TestMethod", ptypes); /*** * What parameters need to be injected, what is the parameter type, and how many parameters */ Method []m= cls.getmethods (); if (M!=null &&m.length>0) { for (int i = 0; i < m.length; i++) { if (M[i].getname (). Equals ("TestMethod")) { Parameter []p=m[i].getparameters (); if (p!=null && p.length>0) { for (Parameter parameter:p) { System.out.println (Parameter.gettype (). GetName ()); } } } } } Object args[] = new OBJECT[2]; Args[0] = "Hello, my dear!"; Hashtable<string, string> ht = new hashtable<string, string> (); Ht.put ("name", "pistachio"); ARGS[1] = HT; String returnstr = (string) method.invoke (new Reflectiontest (), args); System.out.println ("returnstr=" + returnstr); System.out.println ("===========end getmethodtest=========="); } public string TestMethod (String str, Hashtable ht) throws Exception { String returnstr = "return value"; System.out.println ("Test TestMethod () method call"); System.out.println ("str=" + str); System.out.println ("name =" + (String) ht.get ("name")); System.out.println ("End TestMethod () method call"); return returnstr; } }

(full of hard goods) Spring in-depth study of an IOC implementation