Demo of class reflection mechanism + responsibility chain design mode

Demo of class reflection mechanism + responsibility chain design mode

Directly paste the Code:

Reflection Toolkit
Package com.zzk.cn;


Import java. lang. reflect. Method;
Import java. util. List;


/**
* Object processing class
*
* @ Author zhengke. zzk
*/
Public class ObjectInstance {

/**
* Obtain the object based on the class name
*
* @ Param className
* @ Return
*/
Public Object getObjectByClassName (String className ){
Try {
Class cls = Class. forName (className );
Return cls. newInstance ();
} Catch (Exception e ){
Throw new RuntimeException ("ObjectInstance Get Class error:" + e );
}
}

/**
* Execution Method
*
* @ Param className
* @ Param methodName
* @ Return
*/
Public Object getMethodInvoke (String className, String methodName, Object object ){
If (object = null ){
Throw new RuntimeException ("ObjectInstance Get Method Invoke object is null ");
}
Try {
Method method = Class. forName (className). getMethod (methodName, new Class [] {});
Return method. invoke (object );
} Catch (Exception e ){
Throw new RuntimeException ("ObjectInstance Get Method Invoke error:" + e );
}
}

/**
* Execution Method
*
* @ Param className
* @ Param methodName
* @ Return
*/
Public ListGetListByClassName (String className, String methodName, Object object ){
If (object = null ){
Throw new RuntimeException ("ObjectInstance Get Method Invoke object is null ");
}
Try {
Method method = Class. forName (className). getMethod (methodName, new Class [] {});
Return (List) Method. invoke (object );
} Catch (Exception e ){
Throw new RuntimeException ("ObjectInstance Get Method Invoke error:" + e );
}
}

}




Interface
Package com.zzk.cn;
Public interface Filter {
Public void doFilter (Request request, Response response, FilterChain chain );

}



Request:
Package com.zzk.cn;
Public class Request {
String requestStr;

Public String getRequestStr (){
Return requestStr;
}

Public void setRequestStr (String requestStr ){
This. requestStr = requestStr;
}

}


Response:
Package com.zzk.cn;
Public class Response {
String responseStr;

Public String getResponseStr (){
Return responseStr;
}

Public void setResponseStr (String responseStr ){
This. responseStr = responseStr;
}

}



Responsibility chain
Package com.zzk.cn;
Import java. util. ArrayList;
Import java. util. List;

Public class FilterChain implements Filter {
List Filters = new ArrayList ();
Int index = 0;

Public FilterChain addFilter (Filter f ){
This. filters. add (f );
Return this;
}

@ Override
Public void doFilter (Request request, Response response, FilterChain chain ){
If (index = filters. size ())
Return;
Filter f = filters. get (index );
Index ++;
F. doFilter (request, response, chain );
}
}



Policy 1:
Package com.zzk.cn;
Public class FaceFilter implements Filter {

@ Override
Public void doFilter (Request request, Response response, FilterChain chain ){
Request. requestStr = request. getRequestStr (). replace (":)",
"^ V ^ ------- FaceFilter ");
Chain. doFilter (request, response, chain );
Response. responseStr + = "------- FaceFilter ";

}

}



Policy 2:
Package com.zzk.cn;
/**
* Filter script elements in HTML
* @ Author lcq
*
*/
Public class HTMLFilter implements Filter {

@ Override
Public void doFilter (Request request, Response response, FilterChain chain ){
Request. requestStr = request. getRequestStr (). replace ("<","[")
. Replace (">", "] -------- HTMLFilter ");
Chain. doFilter (request, response, chain );
Response. responseStr + = "-------- HTMLFilter ";

}

}



Policy 3:
Package com.zzk.cn;
Public class SesitiveFilter implements Filter {

@ Override
Public void doFilter (Request request, Response response, FilterChain chain ){
Request. requestStr = request. getRequestStr (). replace ("sensitive ","")
. Replace ("cat", "haha ------ SesitiveFilter ");
Chain. doFilter (request, response, chain );
Response. responseStr + = "------ SesitiveFilter ";

}

}


Test method:
Package com.zzk.cn;

Public class Main2 {



Public static void main (String [] args ){
String message = "sensitive words, Chongqing, <script> Dodge :)";
Request request = new Request ();
Request. setRequestStr (message );
Response response = new Response ();
Response. setResponseStr ("response ");

ObjectInstance objectInstance = new ObjectInstance ();
Object object = objectInstance. getObjectByClassName ("com.zzk.cn. HTMLFilter ");

FilterChain fc = new FilterChain ();
Fc. addFilter (Filter) object );
Fc. addFilter (new SesitiveFilter ());

FilterChain fc2 = new FilterChain ();
Fc2.addFilter (new FaceFilter ());

Fc. addFilter (fc2 );
Fc. doFilter (request, response, fc );
System. out. println ("request =" + request. getRequestStr ());
System. out. println ("response =" + response. getResponseStr ());
}
}