步骤一、拷贝下面这个类到你的工程，我写的，可以进一步优化
package dmis;
import java.net.URL;
import java.net.URLClassLoader;
import java.net.JarURLConnection;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.InvocationTargetException;
import java.util.jar.Attributes;
import java.io.IOException;
import javax.swing.*;
/**
* A class loader for loading jar files, both local and remote.
*/
class JarClassLoader extends URLClassLoader {
private URL url;
/**
* Creates a new JarClassLoader for the specified url.
*
* @param url the url of the jar file
*/
public JarClassLoader(URL url) {
super(new URL[] { url });
this.url = url;
}
/**
* Returns the name of the jar file main class, or null if
* no "Main-Class" manifest attributes was defined.
*/
public String getMainClassName() throws IOException {
URL u = new URL("jar", "", url + "!/");
JarURLConnection uc = (JarURLConnection)u.openConnection();
Attributes attr = uc.getMainAttributes();
return attr != null ? attr.getValue(Attributes.Name.MAIN_CLASS) : null;
}
/**
* Invokes the application in this jar file given the name of the
* main class and an array of arguments. The class must define a
* static method "main" which takes an array of String arguemtns
* and is of return type "void".
*
* @param name the name of the main class
* @param args the arguments for the application
* @exception ClassNotFoundException if the specified class could not
* be found
* @exception NoSuchMethodException if the specified class does not
* contain a "main" method
* @exception InvocationTargetException if the application raised an
* exception
*/
public void invokeClass(String name, String[] args)
throws ClassNotFoundException,
NoSuchMethodException,
InvocationTargetException
{
Class c = loadClass(name);
Method m = c.getMethod("main", new Class[] { args.getClass() });
m.setAccessible(true);
int mods = m.getModifiers();
if (m.getReturnType() != void.class || !Modifier.isStatic(mods) ||
!Modifier.isPublic(mods)) {
throw new NoSuchMethodException("main");
}
try {
m.invoke(null, new Object[] { args });
} catch (IllegalAccessException e) {
// This should not happen, as we have disabled access checks
}
}
public void invokeClass(String name)
throws ClassNotFoundException,
NoSuchMethodException,
InvocationTargetException
{
Class c=loadClass(name);
Method m=c.getMethod("main",null);
m.setAccessible(true);
try{
m.invoke(null,null);
}catch(IllegalAccessException e){
}
}
}
二、子模块(jar文件)写接口 即在子模块的main class中多一个方法：public static main(){//这里启动整个子模块} 然后把该子模块打包成jar文件(注意manifest文件中必须声明该jar 文件的main class)三、动态调用子模块 JarClassLoader cl=new JarClassLoader(url);//url指向你的子模块即jar文件的路径 String name=cl.getMainClassName(); cl.invokeClass(name);//OK!
