SpringMVC-Spring-Hibernate项目搭建之一-- 搭建maven 项目 & servlet的demo

一. 搭建maven项目 

1. 新建maven项目，选择maven Project --> Next

2. 勾选 Create a simple project --> Next

3. 填写 Group Id 和 Artifact Id 选择Packaging 为war 之后Finish

构建完成之后项目结构如下所示：

4. 选中项目 右键 properties ，选择 Project Facets 勾选 Dynamic Web Module 点击 左下角 Further configuration available...将项目转换成 Dynamic项目架构；

  勾选 Generate web.xml deployment descriptor点击OK按钮，自动生成 web.xml文件

转换成 Dynamic Web项目之后的项目结构如下所示：

5. 调整项目结构：将 META-INF 和 WEB-INF 复制到webapp目录下，删除WebContent，最终Web项目结构如下所示：

二. 配置pom.xml文件 

1.  <properties>标签中定义变量名，下文中可以直接引用;

2.  <dependencies>加入依赖的 jar包

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
　　　　　　xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>
      <groupId>com.daydayup</groupId>
      <artifactId>ssh</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      <packaging>war</packaging>

      <properties>
          <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
          <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
          <jdk.version>1.7</jdk.version>
          <spring.version>4.2.5.RELEASE</spring.version>
          <hibernate.version>5.1.0.Final</hibernate.version>
      </properties>

      <dependencies>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
        </dependency>
      </dependencies>

</project>

三. 编写一个简单的web demo 

 1. 定义一个servlet  继承HttpServlet -- 只有继承Servlet才能识别到(HttpServlet 是 Servlet的子类);

package com.ggd;

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 HelloWorld extends HttpServlet {

    private static final long serialVersionUID = -7853701805213269376L;

    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {

        response.getOutputStream().write("Haha Servlet success!!!".getBytes());
    }

    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {

    }
}

 2. web.xml 文件的配置如下  

<?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_3_0.xsd"
    id="WebApp_ID" version="3.0">

    <servlet>
        <servlet-name>helloWorld</servlet-name>
        <servlet-class>com.ggd.HelloWorld</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>helloWorld</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

3. 启动tomcat, 访问浏览器http://localhost:8080/ssh/123

　　--最后‘123’是随便输入的<url-pattern>标签中是'/', 浏览器可以识别到所有以http://localhost:8080/ssh/开头的URL地址

　　自此，一个简单的servlet demo实现