java nio http服务器（3）简单的Servlet容器

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Servlet容器中放着我们所有要访问的Servlet，根据我们具体的请求来访问不同的Servlet。下面是一个简单的Servlet容器的实现。request和response的封装以及连接器的实现代码这里就不再重复写了，请看上一篇博客。

servlet

package com.hcserver.servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class MyServlet extends  HttpServlet{private static final long serialVersionUID = 1L;@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {this.doPost(req, resp);}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {String aa = req.getParameter("aa");String bb = req.getParameter("bb");System.out.println("param aa = "+aa);System.out.println("param bb = "+bb);resp.getWriter().print("hello world...");}}

servlet容器

package com.hcserver.container;import java.io.File;import java.util.HashMap;import java.util.Map;import javax.servlet.http.HttpServlet;public class Container {public final static String WEB_ROOT = Container.class.getResource("/webapps").getPath();private Map<String,Map<String,HttpServlet>> projectMap  = new HashMap<>();private static Container container = new Container();private Container(){}public static Container getInstance(){return container;}public void init(){try{//模拟解析web.xml，利用反射得到servlet实例Map<String,HttpServlet> map = new HashMap<>();Class<?> servletClass = Class.forName("com.hcserver.servlet.MyServlet");HttpServlet newInstance = (HttpServlet)servletClass.getConstructor(new Class[]{}).newInstance(new Object[]{});map.put("myServlet", newInstance);projectMap.put("hello",map);}catch(Exception e){}}public Map<String,HttpServlet> getProject(String projectName){return projectMap.get(projectName);}public static void main(String[] args) {container.init();}}

处理器修改

package com.hcserver.process;import java.util.Map;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.hcserver.container.Container;public class Process {public void service(HttpServletRequest request,HttpServletResponse response){String project = request.getContextPath();String servletPath = request.getServletPath();//得到容器类Container container = Container.getInstance();Map<String, HttpServlet> servletMap = container.getProject(project);HttpServlet servlet = servletMap.get(servletPath);try {//返回页面servlet.service(request, response);} catch (Exception e) {e.printStackTrace();} }}

最后启动服务，浏览器，输入：http://localhost:8084/hello/MySevlet?aa=1&bb=3回车后浏览器显示 hello world..

后台输出

param aa = 1

param bb = 3

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