我用的是NetBeans作为开发环境
创建ModulePlugins的Java Class Library，源代码ClassPlugin.java
package programgenesis;
import static java.lang.Math.*;
public class ClassPlugin { public int PluginFunc0(int _x, int _y) { return (int)pow(_x, _y); } }
源代码结束
创建ModuleTest的Java Class Library，源代码ClassTest.java
package programgenesis;import java.io.File; import java.lang.reflect.Method; import java.net.URL; import java.net.URLClassLoader;
public class ClassTest { public int TestFunc0(int _a, int _b, int _c) { try { File _pluginjarfile = new File("D:\NetbeansProject.JAVA\ModulePlugin\dist\ModulePlugin.jar"); URL _jarurl = _pluginjarfile.toURI().toURL(); ClassTest _thisclass = new ClassTest(); URLClassLoader _ucl = new URLClassLoader(new URL[]{_jarurl}, _thisclass.getClass().getClassLoader()); System.out.println("JAR Ready"); if ( _ucl != null ) { Class<?> _lc = _ucl.loadClass("programgenesis.ClassPlugin"); Class[] _argtype = new Class[2]; _argtype[0] = int.class; _argtype[1] = int.class; Method _method = _lc.getDeclaredMethod("PluginFunc0", _argtype); Object _obj = _lc.newInstance(); Object _res = _method.invoke(_obj, _a, _b); Integer _intres = (Integer)_res; if ( _intres.intValue() == _c ) { System.out.println("Test OK!"); return 1; } else { System.out.println("Test Failed"); } }
} catch (Exception e) {
}
return 0;
}
} 源代码结束
创建ApplicationEntry的Java Application，源代码ApplicationEntry.java
package programgenesis;import java.io.File; import java.lang.reflect.Method; import java.net.URL; import java.net.URLClassLoader;
public class ApplicationEntry {
public static void main(String[] args) {
// TODO code application logic here
try {
ApplicationEntry _thisclass = new ApplicationEntry();
File _pluginjarfile = new File("D:\\NetbeansProject.JAVA\\ModulePlugin\\dist\\ModulePlugin.jar");
URL _pluginjarurl = _pluginjarfile.toURI().toURL();
URLClassLoader _pluginucl = new URLClassLoader(new URL[]{_pluginjarurl}, _thisclass.getClass().getClassLoader());
System.out.println("ModulePlugin.jar Ready");
File _testjarfile = new File("D:\\NetbeansProject.JAVA\\ModuleTest\\dist\\ModuleTest.jar");
URL _testjarurl = _testjarfile.toURI().toURL();
URLClassLoader _testucl = new URLClassLoader(new URL[]{_testjarurl}, _thisclass.getClass().getClassLoader());
System.out.println("ModuleTest.jar Ready");
if ( _pluginucl != null && _testucl != null ) {
Class<?> _testlc = _testucl.loadClass("programgenesis.ClassTest");
Class[] _testargtype = new Class[3];
_testargtype[0] = int.class;
_testargtype[1] = int.class;
_testargtype[2] = int.class;
Method _testmethod = _testlc.getDeclaredMethod("TestFunc0", _testargtype);
Object _testobj = _testlc.newInstance();
Object _testres = _testmethod.invoke(_testobj, 2, 3, 8);
Integer _testintres = (Integer)_testres;
if ( _testintres.intValue() == 1 ) {
System.out.println("Test Module Output : OK");
} else
{
System.out.println("Test Module Output : Failed");
}
Class<?> _pluginlc = _pluginucl.loadClass("programgenesis.ClassPlugin");
Class[] _pluginargtype = new Class[2];
_pluginargtype[0] = int.class;
_pluginargtype[1] = int.class;
Method _pluginmethod = _pluginlc.getDeclaredMethod("PluginFunc0", _pluginargtype);
Object _pluginobj = _pluginlc.newInstance();
Object _pluginres = _pluginmethod.invoke(_pluginobj, 5, 4);
Integer _intres = (Integer)_pluginres;
System.out.printf("Plugin Module Output : %d\n", _intres.intValue());
}
} catch (Exception e) {
}
}
}
源代码结束
运行ApplicationEntry
输出结果 ModulePlugin.jar Ready ModuleTest.jar Ready JAR Ready Test OK! Test Module Output : OK Plugin Module Output : 625 IT人朋友们可修改例子里面的几个数字，观察运行结果变化
