Servlet项目的建立hello world

Servlet项目的建立

1. 安装Tomcat
   安装Tomcat
2. 新建JAVA Web项目
   
   
   新建包
   
   新建Servlet类，点next
   
   设置在url中访问的代称，点finsh
   
   重写service方法

package com.wf.test;

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 {

	@Override
	protected void service(HttpServletRequest req, HttpServletResponse resp) 
			throws ServletException, IOException {
		resp.setContentType("text/html;charset=utf-8");
		String str = "<h2>第一个测试程序</h2>";
		resp.getWriter().write(str);
	}
}

3. 配置xml文件

<?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_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>Servlet_Test</display-name>
  <servlet>
    <servlet-name>my</servlet-name>
    <servlet-class>com.wf.test.MyServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>my</servlet-name>
    <url-pattern>/my</url-pattern>
  </servlet-mapping>
</web-app>

4. 运行第一个程序
   启动Tomcat服务器
   
   在浏览器地址栏中输入url
   http://localhost:8080/Servlet_Test/my