1. springmvc_hello入门

1.1 导包

Snip20180912_18.png

1.2 配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">


    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
        <welcome-file>index.htm</welcome-file>
        <welcome-file>index.jsp</welcome-file>
        <welcome-file>default.html</welcome-file>
        <welcome-file>default.htm</welcome-file>
        <welcome-file>default.jsp</welcome-file>
    </welcome-file-list>


    <!-- 前端控制器 -->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!-- 默认找 /WEB-INF/[servlet的名称]-servlet.xml -->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
    </servlet>

    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <!--
            1. /*  拦截所有   jsp  js png .css  真的全拦截   建议不使用
            2. *.action *.do 拦截以do action 结尾的请求     肯定能使用   ERP
            3. /  拦截所有 （不包括jsp) (包含.js .png.css)  强烈建议使用     前台 面向消费者  www.jd.com/search   /对静态资源放行
         -->
        <url-pattern>*.action</url-pattern>
    </servlet-mapping>
</web-app>

1.3 配置springmvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">

        
        
        <!-- 扫描@Controler  @Service   -->
        <context:component-scan base-package="controller"/>
        
        <!-- 处理器映射器 -->
<!--         <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/> -->
        <!-- 处理器适配器 -->
<!--         <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"/> -->
        <!-- 注解驱动 -->
        <mvc:annotation-driven/>

    <!-- 视图解释器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
   </beans>

1.4书写HelloController

@Controller
public class HelloController{

    
    //入门程序 第一   包类 + 类包 + 方法名
    @RequestMapping(value = "/hello/helloSpringmvc.action")
    public ModelAndView hello(){
        
        ModelAndView mav = new ModelAndView();
        
        mav.setViewName("hello");
        
        return mav;
    }
    
}

2. 整合spring、springmvc，mybatis框架

2.1. 结构

Snip20180912_19.png

2.2 applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
    ">


    <context:property-placeholder location="classpath:db.properties"/>

    <!-- 数据库连接池 -->
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
          destroy-method="close">
        <property name="driverClassName" value="${jdbc.driver}" />
        <property name="url" value="${jdbc.url}" />
        <property name="username" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />
        <property name="maxActive" value="10" />
        <property name="maxIdle" value="5" />
    </bean>

    <!-- Mybatis的工厂 -->
    <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!-- 核心配置文件的位置 -->
        <property name="configLocation" value="classpath:sqlMapConfig.xml"/>
    </bean>



    <!-- 注解事务 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!-- 开启注解 -->
    <tx:annotation-driven transaction-manager="transactionManager"/>


    <!-- Mapper动态代理开发   扫描 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 基本包 -->
        <property name="basePackage" value="dao"/>
    </bean>

</beans>

2.3 springmvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">

        
        
    <!-- 扫描@Controler  @Service   -->
    <context:component-scan base-package="controller"/>
    <context:component-scan base-package="service"/>


    <!-- 注解驱动 就相当于 处理器映射器 + 处理器适配器 -->
    <mvc:annotation-driven/>


    <!-- 视图解释器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
        
   </beans>

2.4 sqlMapConfig.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

    <!-- 设置别名 -->
    <typeAliases>
        <!-- 2. 指定扫描包，会把包内所有的类都设置别名，别名的名称就是类名，大小写不敏感 -->
        <package name="pojo" />
    </typeAliases>

</configuration>

2.5 web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">

    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>

    <!--=========================spring=============================-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext*.xml</param-value>
    </context-param>

    <!-- Spring监听器 -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- 处理POST提交乱码问题 -->
    <filter>
        <filter-name>encoding</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>
    </filter>

    <filter-mapping>
        <filter-name>encoding</filter-name>
        <url-pattern>*.action</url-pattern>
    </filter-mapping>



    <!--=========================springmvc=============================-->
    <!-- 前端控制器 -->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!-- 默认找 /WEB-INF/[servlet的名称]-servlet.xml -->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
    </servlet>

    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <!--
            1. /*  拦截所有   jsp  js png .css  真的全拦截   建议不使用
            2. *.action *.do 拦截以do action 结尾的请求     肯定能使用   ERP
            3. /  拦截所有 （不包括jsp) (包含.js .png.css)  强烈建议使用     前台 面向消费者  www.jd.com/search   /对静态资源放行
         -->
        <url-pattern>*.action</url-pattern>
    </servlet-mapping>
</web-app>

2.6 自此整合结束，测试

ItemController

/**
 * 商品管理
 * 
 * @author lx
 *
 */
@Controller
public class ItemController {

    @Autowired
    ItemService itemService;
    
    //入门程序 第一   包类 + 类包 + 方法名
    @RequestMapping(value = "/item/itemlist.action")
    public ModelAndView itemList(){

        // 创建页面需要显示的商品数据
        List<Items> list = itemService.selectItemsList();

        ModelAndView mav = new ModelAndView();
        //数据
        mav.addObject("itemList", list);
        mav.setViewName("itemList");
        return mav;
    }
    
}

public interface ItemService {

    //查询商品列表
    public List<Items> selectItemsList();
}

@Service
public class ItemServiceImpl implements ItemService {

    @Autowired
    ItemsMapper itemsMapper;


    @Override
    public List<Items> selectItemsList() {
        return itemsMapper.selectByExampleWithBLOBs(null);
    }
}

3. 参数绑定之默认参数（ HttpServletRequest request, HttpServletResponse response,HttpSession session,）绑定和简单类型（id）

提交的id和方法中的形参id一样，才可以成功赋值

public interface ItemService {
    // 根据id查询item
    public Items selectItemsById(Integer id);
}

@Service
public class ItemServiceImpl implements ItemService {
    @Autowired
    ItemsMapper itemsMapper;

    @Override
    public Items selectItemsById(Integer id) {
        return itemsMapper.selectByPrimaryKey(id);
    }
}

@Controller
public class ItemController {
    // 跳转改页面 入参 id
    @RequestMapping(value = "/itemEdit.action")
    public ModelAndView toEdit(Integer id,
                               HttpServletRequest request,
                               HttpServletResponse response,
                               HttpSession session,
                               Model model) {

        Items items = itemService.selectItemsById(id);

        ModelAndView mav = new ModelAndView();

        mav.addObject("item", items);
        mav.setViewName("editItem");
        return mav;
    }
}

4. 参数绑定之POJO

//提交修改页面 入参  为 Items对象
    @RequestMapping(value = "/updateitem.action")

//  public ModelAndView updateitem(Items items){
    public ModelAndView updateitem(QueryVo vo){

        // 修改
        itemService.updateItemsById(vo.getItems());

        ModelAndView mav = new ModelAndView();
        mav.setViewName("success");
        return mav;

    }

5. 解决POST乱码

web.xml

<!-- 处理POST提交乱码问题 -->
    <filter>
        <filter-name>encoding</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>
    </filter>

    <filter-mapping>
        <filter-name>encoding</filter-name>
        <url-pattern>*.action</url-pattern>
    </filter-mapping>

6. 自定义格式参数绑定

在springmvc.xml中配置格式转换器

<!-- 注解驱动 -->
        <mvc:annotation-driven conversion-service="conversionServiceFactoryBean"/>
        
        <!-- 配置Conveter转换器  转换工厂 （日期、去掉前后空格）。。 -->
        <bean id="conversionServiceFactoryBean" class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
            <!-- 配置 多个转换器-->
            <property name="converters">
                <list>
                    <bean class="conversion.DateConveter"/>
                </list>
            </property>
        </bean>

7. springmvc和struts2的区别

1、 springmvc的入口是一个servlet即前端控制器，而struts2入口是一个filter过滤器。
2、 springmvc是基于方法开发(一个url对应一个方法)，请求参数传递到方法的形参，可以设计为单例或多例(建议单例)，struts2是基于类开发，传递参数是通过类的属性，只能设计为多例。
3、 Struts采用值栈存储请求和响应的数据，通过OGNL存取数据， springmvc通过参数解析器是将request请求内容解析，并给方法形参赋值，将数据和视图封装成ModelAndView对象，最后又将ModelAndView中的模型数据通过request域传输到页面。Jsp视图解析器默认使用jstl。