Servlet Demo

1、创建web工程:helloservlet

2、创建代码：

    （1）java代码

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;

public class HelloWorld extends HttpServlet {

	private String message;

	public void init() throws ServletException {
		// 执行必需的初始化
		message = "Hello Servlet";
	}

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// 设置响应内容类型
		response.setContentType("text/html");

		// 实际的逻辑是在这里
		PrintWriter out = response.getWriter();
		out.println("<h1>" + message + "</h1>");
	}

	public void destroy() {
		// 什么也不做
	}
}

    （2）web.xml

<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	version="2.5">
	<display-name></display-name>
	<welcome-file-list>
		<welcome-file>index.jsp</welcome-file>
	</welcome-file-list>
	<servlet>
		<servlet-name>HelloWorld</servlet-name>
		<servlet-class>HelloWorld</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>HelloWorld</servlet-name>
		<url-pattern>/HelloWorld</url-pattern>
	</servlet-mapping>
</web-app>

3、通过MyEclipse部署到Tomcat,然后再浏览器访问：http://localhost:8080/helloservlet/HelloWorld

4、运行效果