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1ãå°è¦è°ç¨çç±»ååæ¹æ³åä½ä¸ºåæ°ä¼ ç»æ个servlet.è¿ä¸æ¥çæ¹æ³æ许å¤ç§,ç¨æ¡æ¶,æè
ç´æ¥ç¨xmlHttpRequest对象ï¼
2ãè¦è°ç¨çç±»ååç±»çå®æ´å
è·¯å¾æ好åå¨é
ç½®æ件éï¼è¿éå设类å为Hello,æ¹æ³å为sayHello,并ä¸sayHelloæ¹æ³ä¸å¸¦åæ°,类路å¾ä¸ºcom.demo.Helloã
3ãé
ç½®æ件AjaxConfig.properties
Hello = com.demo.Hello
4ãä¼ å
¥çåæ°è®¾ç½®ä¸º class=Hello&method=sayHello
å¨servletä¸ä½å¦ä¸å¤ç:
String className=request.getParameter("classname");
String methodName=request.getParameter("method");
String classPath=null;
5ã读åé
ç½®æ件,ååºclassNameæ对åºçå¼æ¾å
¥classPathåéä¸ï¼
Class c=Class.forName(classPath);//å è½½ä½ ææå®çç±»
Class param[]=new Class[0];//æ¹æ³çåæ°ä¸º0个
Method m=null;
String returnValue=null;//è¿åå¼
try {
m = c.getMethod("sayHello",param);//è·åä½ ææå®çç±»ä¸çæå®æ¹æ³
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchMethodException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
returnValue=(String)m.invoke(c.newInstance(), new Object[0]);//è°ç¨ä½ ææå®çæ¹æ³
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InstantiationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
6ãå°returnValueçå¼è¿åç»å®¢æ·ç«¯å³å¯
ç±»Hello.java
public class Hello
{
public String sayHello()
{
return "hello";
}
}
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