Java package-based request routing implementation instance sharing _java

Webfilter.java

Copy Code code as follows:

Package Com.hongyuan.route;

Import Java.io.File;
Import java.io.IOException;
Import java.lang.reflect.InvocationTargetException;
Import Java.lang.reflect.Method;

Import Javax.servlet.Filter;
Import Javax.servlet.FilterChain;
Import Javax.servlet.FilterConfig;
Import javax.servlet.ServletException;
Import Javax.servlet.ServletRequest;
Import Javax.servlet.ServletResponse;
Import Javax.servlet.http.HttpServletRequest;

public class Webfilter implements Filter {

public static final String base_package= "Com.hongyuan";
public static final String class_flag= "Action";
@Override
public void Destroy () {}

@Override
public void Dofilter (ServletRequest request, Servletresponse Response,filterchain chain) throws IOException, servletexception {

if (!hasresouce (request)) {

String requestpath= ((httpservletrequest) request). Getservletpath ();
if (Requestpath.indexof (".") >=0) {
Requestpath=requestpath.substring (0, Requestpath.indexof ("."));
}
if (Requestpath.endswith ("/")) {
Requestpath=requestpath.substring (0, Requestpath.length ()-1);
}
Get the requested class fully qualified name
String Classname=base_package+requestpath.replaceall ("/", ".") +class_flag;
Get Request Method Name
String Methodname=request.getparameter ("method");
if (methodname==null| | "". Equals (Methodname.trim ())) {
Methodname= "Index";
}
try {
Gets the processing class and responds to the request
Class Clazz=class.forname (className);
Object Instance=this.initcontext (Clazz,request,response);
Method Method=clazz.getmethod (MethodName, New class[]{});
Object Result=method.invoke (instance, new object[]{});
Response.getwriter (). Print (result);
catch (Exception e) {
E.printstacktrace (Response.getwriter ());
}
}else{
Chain.dofilter (request, response);
}

 }
 //to determine if there is a requested resource
 private Boolean hasresouce (ServletRequest request) {
  string Realpath=request.getservletcontext (). Getrealpath ((httpservletrequest) request). Getservletpath ());
  file resouce=new File (Realpath);
  if (resouce.exists ()) {
   return true;
  }else{
   return false;
 &NBSP}
 }
 //Initialization context
 private Object initcontext (Class clazz, servletrequest request,
   servletresponse response) throws exception{
  object instance=clazz.newinstance ();
  clazz.getmethod ("Setrequest", New Class[]{servletrequest.class}). Invoke (instance, new object[]{ Request});
  clazz.getmethod ("Setresponse", New Class[]{servletresponse.class}). Invoke (instance, new object[]{ Response});
  return instance;
 }

@Override
public void init (Filterconfig arg0) throws Servletexception {}

}

Baseaction.java

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Package Com.hongyuan.route;

Import Javax.servlet.ServletRequest;
Import Javax.servlet.ServletResponse;

Public abstract class Baseaction {
protected ServletRequest request=null;
protected Servletresponse response=null;

Public ServletRequest getrequest () {
return request;
}
public void Setrequest (ServletRequest request) {
This.request = Request;
}
Public Servletresponse GetResponse () {
return response;
}
public void Setresponse (Servletresponse response) {
This.response = response;
}

}