Web项目环境搭建

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实现一个简单的注册功能

项目整体结构：

1、使用maven创建web项目

2、添加依赖和插件

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<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.11</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>5.2.5.RELEASE</version>
    </dependency>
    <!--    Spring事务-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-tx</artifactId>
        <version>5.2.5.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.2.5.RELEASE</version>
    </dependency>
    <!--    MyBatis依赖-->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.1</version>
    </dependency>
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>1.3.1</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.19</version>
    </dependency>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.1.12</version>
    </dependency>

    <!-- servlet依赖-->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.1.0</version>
        <scope>provided</scope>
    </dependency>
    <!-- jsp依赖-->
    <dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>jsp-api</artifactId>
        <version>2.2.1-b03</version>
        <scope>provided</scope>
    </dependency>
	<!-- 监听器依赖-->
      <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-web</artifactId>
          <version>5.2.5.RELEASE</version>
      </dependency>
</dependencies>

<build>
    <resources>
        <resource>
            <directory>src/main/java</directory><!--所在的目录-->
            <includes><!--包括目录下的.properties,.xml文件都会扫描到-->
                <include>**/*.properties</include>
                <include>**/*.xml</include>
            </includes>
            <filtering>false</filtering>
        </resource>
    </resources>
    <plugins>
        <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.1</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
    </plugins>
</build>

将spring-mybatis整合的代码复制到src下

3、编写页面

index.jsp

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<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>注册页面</title>
</head>
<body>
    <h1>员工注册</h1>
    <form action="registerServlet" method="post">
        <table>
            <tr>
                <td>姓名</td>
                <td><input type="text" name="name"></td>
            </tr>
            <tr>
                <td>性别</td>
                <td><input type="radio" name="gender" value="1">男
                <input type="radio" name="gender" value="0">女</td>
            </tr>
            <tr>
                <td>电子邮件</td>
                <td><input type="text" name="email"></td>
            </tr>
            <tr>
                <td>部门编号</td>
                <td><input type="radio" name="deptId" value="1">1
                <input type="radio" name="deptId" value="2">2</td>
            </tr>
            <tr>
                <td colspan="2">
                    <input type="submit" value="注册提交">
                </td>
            </tr>
        </table>
    </form>
</body>
</html>

registerSuccess.jsp

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<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>注册成功页面</title>
</head>
<body>
    <p>注册成功</p>
</body>
</html>

4、编写servlet

1.在web.xml中注册servlet和listener

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<!--注册servlet-->
<servlet>
    <servlet-name>RegisterServlet</servlet-name>
    <servlet-class>com.zyz.controller.RegisterServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>RegisterServlet</servlet-name>
    <url-pattern>/registerServlet</url-pattern>
</servlet-mapping>

<!--注册监听器ContextLoaderListener  自动创建容器对象，并放入全局作用域ServletContext中
                                       用户发起请求时可以直接使用对象，不需要再创建容器-->
<!--自定义配置文件路径  创建容器对象时需要读取配置文件-->
<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
</context-param>
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

2、编写servlet程序

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public class RegisterServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String name = request.getParameter("name");
        String gender = request.getParameter("gender");
        String email = request.getParameter("email");
        String deptId = request.getParameter("deptId");

        WebApplicationContext webApplicationContext = null;
        /*// 从ServletContext中获取容器对象
        String key = WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE;
        Object attribute = getServletContext().getAttribute(key);
        if(attribute!=null){
            webApplicationContext = (WebApplicationContext) attribute;
        }*/

       // 使用框架提供的工具类直接从ServletContext中获取创建好容器对象
        ServletContext servletContext = getServletContext();
        webApplicationContext = WebApplicationContextUtils.getRequiredWebApplicationContext(servletContext);

        // 获取service
        EmployeeService employeeService = (EmployeeService) webApplicationContext.getBean("employeeService");
        Employee employee = new Employee(null,name,gender,email,Integer.parseInt(deptId));
        employeeService.addEmp(employee);

        // 注册成功 页面跳转
        request.getRequestDispatcher("/registerSuccess.jsp").forward(request,response);

    }

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

    }
}