java基于包结构的请求路由实现实例分享

webfilter.java

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);
   }
   //获取请求的类全限定名
   string classname=base_package+requestpath.replaceall("/", ".")+class_flag;
   //获取请求方法名称
   string methodname=request.getparameter("method");
   if(methodname==null||"".equals(methodname.trim())){
    methodname="index";
   }
   try {
    //获取处理类并响应请求
    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);
  }

 }
 //判断是否存在请求的资源
 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;
  }
 }
 //初始化上下文
 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

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;
 }

}