Create a maven project with IDEA (foolish steps)

(First time using maven, you need to connect to the Internet)

1. IDEA configures local maven

使用idea创建maven工程之前需要将本地的maven配置到idea环境中，配置方法如下：

1.1 Configure local maven

1. Step 1: Open default settings (effective for future new projects):
   
   2. Step 2: Configure the paths of maven_home and settings.xml:
   

1.2 Configure maven parameters

使用idea创建maven项目后，默认会去网络中下载一些配置资源。需要设置参数archetypeCatalog。
设置方法如下：将-DarchetypeCatalog=internal 设置到Maven--Runner--VM Options中。

参数：-DarchetypeCatalog=internal

2. Create a maven java project

使用maven创建的项目可分为3种类型：普通java项目，web项目和maven的父工程。 
这三种项目对象的打包方式分别是：jar，war和pom。

2.1 Creation steps

Step 1: File–New–Project

Step 2: Select maven and then next step:

Step 3: Fill in the coordinate information of the project:

Step 4: Specify the project name and path: idea will remove the - in the project name, we Just add it.

2.2 Introduction to java project directory

2.3 Testing

Write main program code

Write test code

Test results

3. Create a web project

3.1 Creation steps

Step 1: Create a normal java project.
Follow the steps to create a maven java project.

Step 2: Configure the packaging method.
The packaging method of the web project is war, and open the pom file of the maven project. Add a label under the coordinate information of the project and set the packaging method.

Step 3: Configure the webapp directory and web.xml

Open the Project Structure view

The effect is as follows

Step 4: Creation is completed

设置完成之后，main目录下会创建webapp-WEB-INF-web.xml。

3.2 Publish web projects

Step 1: Edit Configurations
Step 2: Add local tomcat.
Follow the sequence of numbers and icons in the figure below: + --> Tomcat Server --> Local

Step 3: Configure tomcat


Step 4: Start testing

在webapp目录下新建一个index.html文件，文件内容如下：

After starting tomcat, visit index.html. If index.html can be accessed correctly. Description project creation OK.