TIP：只知道类名，要运用反射机制动态调用已知类名的方法
类结构：
-------form(package):CityQueryForm.java
-------test(package):Test.java
CityQueryForm.java:
package form;
import java.util.Hashtable;
public class CityQueryForm { private String name = null; public void setName(Hashtable ht) { this.name = (String) ht.get("name"); } public String getName() { return name; }
}
Test.java:
package test;
import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import java.util.Hashtable;
public class Test {
private void getForm(Hashtable ht, String formName) throws ClassNotFoundException, SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException, InstantiationException { //Class c = Class.forName(formName); Object o = Class.forName(formName).newInstance(); // 指定类名的类对象 Class partypes[] = new Class[1]; partypes[0] = Hashtable.class; //setName方法需要的参数
Method ms = o.getClass().getMethod("setName", partypes); //得到指定方法名和参数的方法对象 Method mg = o.getClass().getMethod("getName", null); ms.invoke(o, ht); //方法调用 String mg.invoke(o, null); System.out.println(name); }
public static void main(String[] args) throws ClassNotFoundException, SecurityException, IllegalArgumentException, NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException { String formName = "form.CityQueryForm"; Hashtable ht = new Hashtable(); ht.put("name", "wuhan"); Test t = new Test(); t.getForm(ht,formName);
}
}
测试结果：
wuhan
