import java.lang.reflect.Method;
import java.sql.Date;
public class Methoder {
/**
* @param args
*/
public static void main(String[] args) throws Exception {
Class<?> clazz = Class.forName("InvokedClass");
Object o = clazz.newInstance();
Class<?> types[] = new Class[3];
types[0] = Class.forName("java.lang.String");
types[1] = Class.forName("java.sql.Date");
types[2] = int.class;
Method m = clazz.getDeclaredMethod("sayHello", types);
m.invoke(o, "libram", Date.valueOf("1988-8-8"), 19);
System.out.println(o.toString());
}
}
class InvokedClass {
private String name;
private Date birth;
private int age;
public void sayHello(String name, Date birth, int age) {
this.name = name;
this.birth = birth;
this.age = age;
}
public String toString() {
return "name = " + name + "\tbirth = " + birth.toString() + "\tage = "
+ age;
}
}
一 072010
一 072010
package org.lbr.action;
import java.io.PrintWriter;
import java.lang.reflect.Method;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
public class MyDispatch extends Action {
@Override
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
response.setCharacterEncoding("GBK");
PrintWriter out = response.getWriter();
String parameterName = mapping.getParameter();
String parameterValue = request.getParameter(parameterName);
if (parameterValue.equals("")) {
out.println(parameterName + "指定的属性值为空!");
} else if (parameterValue.equals("execute")) {
out.println("指定的属性值不能为 execute");
} else {
Class<?>[] types = new Class<?>[4];
types[0] = Class.forName("org.apache.struts.action.ActionMapping");
types[1] = Class.forName("org.apache.struts.action.ActionForm");
types[2] = Class.forName("javax.servlet.http.HttpServletRequest");
types[3] = Class.forName("javax.servlet.http.HttpServletResponse");
try {
Method method = this.getClass()
.getMethod(parameterValue, types);
if (method != null) {
return (ActionForward) method.invoke(this, mapping, form,
request, response);
}
} catch (NoSuchMethodException e) {
throw new Exception("\n没有找到名为 \npublic ActionForward "
+ parameterValue
+ "(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception\n的方法");
} catch (SecurityException e) {
throw e;
}
}
return null;
}
}
ActionConfig ActionMapping ActionForward ForwardConfig
四个类之间的关系图：
为什么要分别让ActionMapping和ActionForward分别继承ActionConfig与ForwardConfig?
ActionConfig和ForwardConfig分别包装了struts-config.xml中<action>标签和<forward>标签中的内容，一方面他们是一个关于struts设置的bean包装类，只要求提供自己属性的一些setter和getter方法，不能做过多的事情，另一方面，由于如果直接把ActionMapping中的findForward()方法放到ActionConfig中的话，那么设置在<global-forwards>中的<forward>内容就找不到了，这种高层鸟瞰的方法可以在高处对底层的bean形成一个更好的包装。
