ssm框架整合之快速开发

作为一名初级程序员，在工作中，项目搭建根本就不是我的活。于是乎这两天又想搭搭项目练练手，废话不说了，直接开始。

web项目集成Spring

1、在项目的pom文件中添加Spring相关的依赖，具体代码如下：

<properties>
    <spring.version>5.0.4.RELEASE</spring.version>
  </properties>

  <dependencies>
    <!--spring start-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>${spring.version}</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context-support</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aspects</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-expression</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>${spring.version}</version>
    </dependency>

2、/src/main/resources 目录下创建applicationContext.xml配置文件，其中<context:component-scan/>注解表示扫描base-package包或者子包下所有java类，并注册成Bean

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
           http://www.springframework.org/schema/tx
           http://www.springframework.org/schema/tx/spring-tx.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-2.5.xsd">
        <!--包扫描-->
        <context:component-scan base-package="com.yiyi"/>
</beans>

3、在web.xml中配置监听器ContextLoaderListener，它的作用是启动web容器时，自动装配ApplicationContext的配置信息。

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>
  <!--初始化spring容器-->
  <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>
</web-app>

4、在src/main/test/com.yiyi.test目录下创建名为SpringTest的测试类

@Service
public class SpringTest {

    @Test
    public void testSpring(){
        //获取应用上下文
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
        SpringTest springTest = (SpringTest) applicationContext.getBean("SpringTest");
        springTest.sayHelloWord();
    }

    public void sayHelloWord(){
        System.out.println("hai yiyi");
    }
}

运行控制台会打印hai yiyi到这里web集成spring框架完毕

Spring集成SpringMVC

1、第一步还是和上面一样导入maven依赖

<javax.servlet.version>4.0.0</javax.servlet.version>
<jstl.version>1.2</jstl.version>

<!--springMVC-->
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>${jstl.version}</version>
    </dependency>

    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>${javax.servlet.version}</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${spring.version}</version>
    </dependency>

2、在web.xml文件中配置springmvc的前段控制器DispatcherServlet,它的作用是用来拦截匹配的请求。<init-param>：整个项目的局部变量，相当于设定了一个固定值，只能在当前的Servlet中使用，容器启动时会加载配置文件spring-mvc.xml<load-on-startup>：表示启动容器时初始化该servlet。当值为0或者大于0时，表示容器在应用启动时加载并初始化这个servlet。如果小于0或未指定，则指示容器在该servlet被选择时才加载。

 <servlet>
    <servlet-name>dispatcherServlet</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>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>dispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

3、在src/main/resources下创建spring-mvc.xml，<mvc:annotation-driven/>:该注解会自动注册RequestMappingHandleMapping和RequestMappingHandleAdapter两个Bean，是springmvc为@Controller分发请求所必须的，并提供了数据绑定支持、@NumberFormatannotion支持、@DateTimeFormat支持等，试图解析器我就不说了。

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">

    <!-- 扫描controller(后端控制器),并且扫描其中的注解-->
    <context:component-scan base-package="com.yiyi.controller"/>
    <!--设置配置方案 -->
    <mvc:annotation-driven/>
    <!--配置JSP　显示ViewResolver(视图解析器)-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <property name="prefix" value="/WEB-INF/views/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

4、在/src/main/java目录下创建包com.yiyi.controller，并创建控制层类UserController,
@GetMapping为@RequestMapping(method = RequestMethod.Get)的缩写

@Controller
@RequestMapping("/user")
public class UserController {

    @Autowired
    private UserService userService;
    @GetMapping("/findAll")
    public String findAll(){
        return "hello";
    }
}

开启tomcat，在浏览器输入地址localhost:8080/user/findAll跳到hello.jsp,至此spring集成springmvc完毕

Spring集成Mybatis

1、配置maven依赖

<mybatis.version>3.4.6</mybatis.version>
<mysql.connector.java.version>8.0.9-rc</mysql.connector.java.version>
<druid.version>1.1.9</druid.version>
<mybatis.spring.version>1.3.2</mybatis.spring.version>

    <!--mybatis-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>${mysql.connector.java.version}</version>
    </dependency>

    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>${druid.version}</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>${mybatis.version}</version>
    </dependency>

    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>${mybatis.spring.version}</version>
    </dependency>

2、在src/main/resources目录下创建db.properties配置文件

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1:3306/test?serverTimezone=GMT
jdbc.username=root
jdbc.password=123456

3、在applicationContext配置文件添加如下配置，此步是集成mybatis的关键

<!--配置数据库相关参数-->
        <context:property-placeholder location="classpath:jdbc.properties" ignore-unresolvable="true"/>

        <!--数据源-->
        <bean name="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
                <property name="driverClassName" value="${jdbc.driverClassName}" />
                <property name="url" value="${jdbc.url}" />
                <property name="username" value="${jdbc.username}" />
                <property name="password" value="${jdbc.password}" />
        </bean>
        <!--配置sqlSessionFactory-->
        <bean class="org.mybatis.spring.SqlSessionFactoryBean" name="sqlSessionFactory">
                <property name="dataSource" ref="dataSource"></property>
                <!--扫描sql配置文件：mapper需要的xml文件-->
                <property name="mapperLocations" value="classpath:dao/*.xml"></property>
        </bean>
        <!---->
        <bean name="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
                <constructor-arg index="0" ref="sqlSessionFactory"/>
        </bean>
        <!--扫描basePackage下所有的@MyBatisDao注解的接口-->
        <bean name="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
                <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
                <property name="basePackage" value="com.yiyi.dao"/>
        </bean>

接下来就可以编写代码进行测试了。
至此ssm框架整合完毕。