Java反射调用ashx

本文主要是介绍Java反射调用ashx，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

这篇文章卡了大概一周，一个是没时间，只能带娃加锻炼间隙挤点时间，一个是碰到了问题卡住了。本篇实现反射调用ashx实现类的基础结构。

首先申明ashx的接口，所有的ashx实现类继承实现该接口的基类

package appcode;
import java.io.*;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
//http执行请求接口
public interface IBaseHttpHandler {/// <summary>/// 执行请求/// </summary>/// <param name="request">请求对象</param>/// <param name="response">响应对象</param>public void ProcessRequest(HttpServletRequest request, HttpServletResponse response);
}

然后实现第一个不需要会话的基类

package appcode;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.PrintWriter;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.lang.Class;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.jar.JarFile;
import java.util.jar.JarEntry;
import LIS.Core.MultiPlatform.LISContext;
import appcode.IBaseHttpHandler;
//实现不带会话的请求基类
public class BaseHttpHandlerNoSession implements IBaseHttpHandler {///请求对象public HttpServletRequest Request=null;///响应对象HttpServletResponse Response=null;///输出数据到前台private void Write(PrintWriter writer,String str){writer.println(str);writer.flush();writer.close();}/// <summary>/// 执行请求/// </summary>/// <param name="request">请求对象</param>/// <param name="response">响应对象</param>public void ProcessRequest(HttpServletRequest request, HttpServletResponse response){try {Request = request;Response = response;//前台传入的要调用的方法String method = LISContext.GetRequest(request, "Method");if (method != "") {//得到方法Method m = this.getClass().getMethod(method);if (m != null) {//执行Object ret = m.invoke(this);PrintWriter writer = response.getWriter();if (ret == null) {Write(writer, "");} else {Write(writer, (String) ret);}} else {//没有指定名称的方法}} else {//没按要求传调用方法}}catch (Exception ex){ex.printStackTrace();}}
}

然后实现主中间件中转调用实现的ashx

import appcode.IBaseHttpHandler;import java.io.*;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.concurrent.ConcurrentHashMap;
import java.net.URL;
import java.net.URLClassLoader;import java.util.*;@javax.servlet.annotation.WebServlet(name = "MianMiddleware")
public class MianMiddleware extends javax.servlet.http.HttpServlet {/// <summary>/// 缓存路径和类型，允许多线程读一个线程写/// </summary>private static ConcurrentHashMap<String, Class> hsType = new ConcurrentHashMap<>();///执行post请求@Overrideprotected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html");request.setCharacterEncoding("UTF-8");response.setCharacterEncoding("UTF-8");String url=request.getRequestURI();//解析得到类名String className = url.split("\\.")[0];PrintWriter writer = response.getWriter();//反射得到类型Object objDeal = GetObjectByConfString(className,writer);//转换处理接口if(objDeal!=null){//转换成接口appcode.IBaseHttpHandler baseDeal=(appcode.IBaseHttpHandler)objDeal;baseDeal.ProcessRequest(request,response);}else{Write(writer,"为找到名称为:"+className+"的处理类");}}/// <summary>/// 通过配置得当对象/// </summary>/// <param name="confStr">配置/UI/sys/ashx/ashCommonNoSession</param>/// <returns></returns>public static Object GetObjectByConfString(String confStr,PrintWriter writer) {try {//取第一部分if (confStr.charAt(0) == '/') {confStr = confStr.substring(1);}if (!hsType.containsKey(confStr)) {URL urlBase = new File("D:\\Java业余\\jbase\\Lib\\appcode.jar").toURI().toURL();//自己生成jar包路径URL url = new File("D:\\Java业余\\jbase\\Lib\\AshDemo.jar").toURI().toURL();URL[] urls = new URL[]{urlBase,url};//加载程序集，这里很重要，一定要指定父加载器，否则加载的类和父加载器的类不认为是一个类URLClassLoader loader = new URLClassLoader(urls, MianMiddleware.class.getClassLoader());ClassLoader  loader1=Thread.currentThread().getContextClassLoader();//加载类Class c = loader.loadClass("AshDemo.ashDemo");//先写死，后面执行编译和从jar包反射hsType.put(confStr, c);}Class c = hsType.get(confStr);//创建对象Object o = c.newInstance();return o;}catch (Exception ex) {ex.printStackTrace();}return null;}//get直接走post的逻辑@Overrideprotected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doPost(request,response);}///输出数据到前台private static void Write(PrintWriter writer,String str){writer.println(str);writer.flush();writer.close();}}