使用ssm框架实现简单网页注册功能

Posted 2021-02-04 darknessplus

1、注册Spring配置文件，在web应用启动时创建Spring容器（注册listener）。

<!-- 注册spring配置文件 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring-*.xml</param-value>
    </context-param>
 
    <!--注册contextLoaderListener，在web应用启动时创建spring容器-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

2、字符集过滤器

<!--字符集过滤器，-->
    <filter>
        <filter-name>CharacterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

3、注册SpringMVC中央调度器

<!--MVC中央调度器，注册mvc配置文件-->
    <servlet>
        <servlet-name>SpringMVCDispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-mvc.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>SpringMVCDispatcher</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>

4、定义实体类，实现页面。
例如Student类，注册页面，欢迎页面

5、实现处理器，编写主业务逻辑，等待service注入。

public class RegisterHandler implements Controller {
    private IStudentService studentService;//等待注入，设置setter
 
    public void setStudentService(IStudentService studentService) {
        this.studentService = studentService;
    }
 
    @Override
    public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
        String name = request.getParameter("name");
        String ageStr = request.getParameter("age");
        Integer age = Integer.valueOf(ageStr);
        Student student = new Student(name, age);
        studentService.registerStudent(student);
 
        ModelAndView modelAndView = new ModelAndView("/welcome.jsp");
        modelAndView.addObject("student",student);
        return modelAndView;
    }
}

6、编写service层接口，等待dao层注入

public interface IStudentService {
    void registerStudent(Student student);
}
 
public class StudentServiceImpl implements IStudentService {
    private IStudentDao studentDao;//等待注入，设置setter
 
    public void setStudentDao(IStudentDao studentDao) {
        this.studentDao = studentDao;
    }
 
    @Override
    public void registerStudent(Student student) {
        studentDao.insertStudent(student);
    }
}

7、编写dao层接口，实现dao层（mapper映射）。最好把mapper映射放在dao包下，但是这样有个问题就是不会被编译。尝试放在resources文件夹下

public interface IStudentDao {
    void insertStudent(Student student);
}
 
//IStudentDao.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="dao.IStudentDao">
    <insert id="insertStudent" useGeneratedKeys="true" keyProperty="id">
        insert into student(name,age) values(#{name},#{age})
    </insert>
</mapper>

8、数据库连接，数据源

//jdbc.properties
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1:3306/test?serverTimezone=Asia/Shanghai
jdbc.user=1234
jdbc.password=1234
 
//spring-db.xml
<!-- c3p0 数据源-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.user}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>
    <!--注册数据库配置属性文件-->
    <context:property-placeholder location="classpath:jdbc.properties"/>

9、整合spring与mybatis
重点：sqlSessionFactoryBean、mapper扫描器

<!--注册SqlSessionFactory的Bean-->
    <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="configLocation" value="classpath:mybatis.xml"/>
    </bean>
 
    <!--mapper扫描器，指定扫描mapper映射文件的位置-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactoryBean"/>
        <property name="basePackage" value="dao"/>
    </bean>

10、dao注入到service，service注入到handler

<bean id="studentService" class="service.StudentServiceImpl">
        <property name="studentDao" ref="IStudentDao"/>
    </bean>
 
 <bean id="/test/register.do" class="handlers.RegisterHandler">
        <property name="studentService" ref="studentService"/>
    </bean>

11、最后在pom里编译一下没放进resources目录的xml文件

<build>
        <!--重要！！！-->
        <!--  编译java目录下的xml文件（不在resources目录下的） -->
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
            </resource>
        </resources>
    </build>

12、添加事务处理

<!-- 注册事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>
 
    <tx:advice id="advice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="register*" propagation="REQUIRED" isolation="DEFAULT"/>
        </tx:attributes>
    </tx:advice>
 
    <!-- AspectJ的aop配置-->
    <aop:config>
        <aop:pointcut id="point" expression="execution(* service.*.*(..))"/>
        <aop:advisor advice-ref="advice" pointcut-ref="point"/>
    </aop:config>