第一个Servlet

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import java.io.*;import javax.servlet.*;import javax.servlet.http.*;public class HelloWorld extends HttpServlet {private String message;@Overridepublic void init() throws ServletException {// TODO 自动生成的方法存根//super.init();message = "hello  world!";}@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {// TODO 自动生成的方法存根//super.doGet(req, resp);resp.setContentType("text/html");PrintWriter out = resp.getWriter();out.println("<h1>"+message+"</h1>");}@Overridepublic void destroy() {// TODO 自动生成的方法存根//super.destroy();}}

然后把HelloWorld.java文件生成HelloWorld.class文件，

E:\eclipse-jee-kepler-sr1-win32\workspace2015\Hello_1\src>javac HelloWorld.java    ////生成HelloWorld.class文件

<pre name="code" class="java">拷贝到C:\Program Files\Apache Software Foundation\Tomcat 7.0\webapps\ROOT\WEB-INF\classes，如果没有classes文件夹需要新建

然后把下面的这段拷贝到C:\Program Files\Apache Software Foundation\Tomcat 7.0\webapps\ROOT\WEB-INF\web.xml，要在</description></description>标签里面

打开http://localhost:8080/HelloWorld，就看到页面。发现不配置CLASSPATH:.;F:\Servlet\pro1;C:\Program Files\Apache Software Foundation\Tomcat 7.0\lib\servlet-api.jar也行

<img src="http://img.blog.csdn.net/20151110180832713?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />

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