1.配置tomacat：點擊window-->preferences-->server-->Runtime Environments-->Add.. -->Apache Tomact 8.5（你的Tomact版本）-->選擇Tomcat安裝路徑-->完成

並先新建一個Dynamic Web 項目

一定要先勾選這個 xml 否則還要去找配置感覺很麻煩。

2.在Java Resources 的src中建立自己java代碼和正常Java項目一樣可以建立impl包，Dao包等等等以后項目變大慢慢會建

3.編寫一下hellojavaweb

 1 package com.etc.javaweb;
 2 
 3 import java.io.IOException;
 4 import javax.servlet.ServletException;
 5 import javax.servlet.http.HttpServlet;
 6 import javax.servlet.http.HttpServletRequest;
 7 import javax.servlet.http.HttpServletResponse;
 8 
 9 public class HelloJavaWeb extends HttpServlet {
10 private static final long serialVersionUID = 1L;
11 
12 @Override
13 protected void doGet(HttpServletRequest request, HttpServletResponse response)
14 throws ServletException, IOException {
15 response.getWriter().append("Hello JavaWeb");
16 }
17 
18 @Override
19 protected void doPost(HttpServletRequest request, HttpServletResponse response)
20 throws ServletException, IOException {
21 doGet(request, response);
22 }
23 }

4.配置xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
 3 <display-name>JavaWeb</display-name>
 4 <servlet>
 5 <servlet-name>HelloJavaWeb</servlet-name>
 6 <servlet-class>com.etc.javaweb.HelloJavaWeb</servlet-class>
 7 </servlet>
 8 
 9 <servlet-mapping>
10 <servlet-name>HelloJavaWeb</servlet-name>
11 <url-pattern>/HelloJavaWeb</url-pattern>
12 </servlet-mapping>
13 </web-app>