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[java web 入门](一)MyEclipse & HelloWorld 记录

第一部,下载安装MyEclipse for mac.

   http://downloads.myeclipseide.com/downloads/products/eworkbench/2014/installers/myeclipse-spring-2014-GA-offline-installer-macosx.dmg
   http://downloads.myeclipseide.com/downloads/products/eworkbench/2014/installers/myeclipse-pro-2014-GA-offline-installer-macosx.dmg


第二部,helloWorld

   1,新建项目






    2, 新建MyServlet类,继承字HttpServlet,重写doGet和doPost方法,调用process方法响应请求。

     

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@SuppressWarnings("serial")
public class MyServlet extends HttpServlet {

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		process(req,resp);
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		process(req,resp);
	}
	
	/**
	 * @param req
	 * @param resp
	 * @throws ServletException
	 * @throws IOException
	 */
	protected void process(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		resp.setContentType("text/html");
		PrintWriter out = resp.getWriter();
		out.println("<HTML><HEAD><TITLE>My First Servlet</TITLE></HEAD>");
		out.println("<BODY>");
		out.println("<H1>Hello , Jason Hu</H1>");
		out.println("</BODY></HTML>");
	}

}

     3,在web.xml中配置servlet及servlet-mapping

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>web01</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  
  <servlet>
  	<servlet-name>MyFirstServlet</servlet-name>
  	<servlet-class>com.jason.web.helloworld.MyServlet</servlet-class>
  </servlet>
  
  <servlet-mapping>
  <servlet-name>MyFirstServlet</servlet-name>
  <url-pattern>/MyServlet</url-pattern>
  </servlet-mapping>
  
</web-app>

      4,运行项目,http://192.168.1.117:8080/HelloWorld/MyServlet