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Spring + SpringMVC + Mybatis 简单应

Spring + SpringMVC + Mybatis 简单应

作者: shpunishment | 来源:发表于2018-08-24 23:24 被阅读0次

    web.xml 配置 SpringMVC

    <?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_4_0.xsd"
             version="4.0">
    
        <!-- 配置Spring IoC 配置文件路径 -->
        <context-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/applicationContext.xml</param-value>
        </context-param>
    
        <!-- 配置ContextLoaderListener用以初始化Spring IoC 容器 -->
        <listener>
            <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
        </listener>
    
        <!-- 配置DispatchServlet -->
        <!-- servlet-name : dispatcher 即找到/WEB-INF/dispatcher-servlet.xml载入Web工程 -->
        <servlet>
            <servlet-name>dispatcher</servlet-name>
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
            <!-- 使DispatchServlet在服务器启动的时候就初始化 -->
            <load-on-startup>2</load-on-startup>
        </servlet>
        
        <!-- Servlet 拦截配置  -->
        <servlet-mapping>
            <servlet-name>dispatcher</servlet-name>
            <url-pattern>*.shpun</url-pattern>
        </servlet-mapping>
        
    </web-app>
    

    dispatcher-servlet.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:mvc="http://www.springframework.org/schema/mvc"
           xmlns:context="http://www.springframework.org/schema/context"
           xmlns:p="http://www.springframework.org/schema/p"
           xmlns:tx="http://www.springframework.org/schema/tx"
           xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans.xsd
           http://www.springframework.org/schema/mvc
           http://www.springframework.org/schema/mvc/spring-mvc.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context.xsd
           http://www.springframework.org/schema/tx
           http://www.springframework.org/schema/tx/spring-tx.xsd">
    
        <!-- 使用注解驱动 -->
        <mvc:annotation-driven/>
    
        <!-- 扫描包下注解 -->
        <context:component-scan base-package="com.*"/>
    
        <!-- 定义视图解析器 -->
        <!-- 找到/WEB-INF/jsp文件夹下,且文件后缀为.jsp的文件座位映射 -->
        <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"
              p:prefix="/WEB-INF/jsp/" p:suffix=".jsp"
        />
    
        <!-- 开启注解事务 -->
        <tx:annotation-driven transaction-manager="transactionManager"/>
    
    </beans>
    

    applicationContext.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: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.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context.xsd
           http://www.springframework.org/schema/tx
           http://www.springframework.org/schema/tx/spring-tx.xsd">
    
        <!-- 启用扫描 -->
        <context:annotation-config/>
        <context:component-scan base-package="com.shpun.*"/>
    
        <!-- 引入外部properties文件 -->
        <context:property-placeholder location="WEB-INF/mysql.properties"/>
    
        <!-- 设置数据库信息等 -->
        <bean id="dateSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
            <property name="username" value="${jdbc.username}"/>
            <property name="password" value="${jdbc.password}"/>
            <property name="driverClassName" value="${jdbc.driver}"/>
            <property name="url" value="${jdbc.url}"/>
        </bean>
    
    
        <!-- 集成Mybatis  SqlSessionFactoryBean 去支持 SqlSessionFactory 配置 -->
        <bean  id="SqlSessionFactory"  class="org.mybatis.spring.SqlSessionFactoryBean">
            <property name="dataSource" ref="dateSource"/>
            <property name="configLocation" value="WEB-INF/mybatis-config.xml"/>
        </bean>
    
        <!-- 事务管理器配置数据源事务 -->
        <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <property name="dataSource" ref="dateSource"/>
        </bean>
    
        <!-- 使用注解定义事务 -->
        <tx:annotation-driven transaction-manager="transactionManager"/>
    
        <!-- 自动扫描配置Mapper的类 -->
        <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
            <!-- 指定Spring扫描的包 -->
            <property name="basePackage" value="com.shpun.mapper"/>
            <!-- 指定Spring中SqlSessionFactory的Bean的名称 -->
            <property name="SqlSessionFactoryBeanName" value="SqlSessionFactory"/>
            <!-- 指定类被注解标识才扫描 @Repository -->
            <property name="annotationClass" value="org.springframework.stereotype.Repository"/>
        </bean>
    
    </beans>
    

    mybatis-config.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>
    
        <settings>
            <!-- 全局映射器启用缓存 -->
            <setting name="cacheEnabled" value="true"/>
            <!-- 允许JDBC支持生成的键 -->
            <setting name="useGeneratedKeys" value="true"/>
            <!-- 配置默认执行器 Reuse 重用预处理语句 -->
            <setting name="defaultExecutorType" value="REUSE"/>
            <!-- 全局启用延迟加载 -->
            <setting name="lazyLoadingEnabled" value="true"/>
            <!-- 设置超时时间,决定驱动等待一个数据库相应的时间 -->
            <setting name="defaultStatementTimeout" value="2500"/>
        </settings>
    
        <!-- 别名 -->
        <typeAliases>
            <typeAlias alias="customer" type="com.shpun.entity.Customer"/>
        </typeAliases>
    
        <!-- 映射器路径 -->
        <mappers>
            <mapper resource="com/shpun/mapper/CustomerMapper.xml"/>
        </mappers>
    
    </configuration>
    

    Controller

    package com.shpun.controller;
    
    @Controller
    @RequestMapping("/customer")
    public class CustomerController {
    
        @Autowired
        private CustomerService customerService = null;
    
        @RequestMapping(value = "/select",method = RequestMethod.GET)
        public ModelAndView getCustomer(@RequestParam("id")String id){
            Customer customer = customerService.selectCustomer(id);
    
            ModelAndView mv = new ModelAndView();
            mv.setViewName("customer");
            mv.addObject("customer",customer);
            // 需要Jackson2的jar包,设置后,返回的是json文件
            //mv.setView(new MappingJackson2JsonView());
            return mv;
        }
    
    }
    
    table json

    ps:

    Spring + SpringMVC + Mybatis 配置文件较多,一定一定一定不能配错了,不然各种错误,很难受的!相应的jsp文件需要使用jstl库,记得添加到lib中。然后再jsp的开头

    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    

    IDEA中还要设置


    IDEAuseJSTL.PNG

    同时配置好,就可以使用JSTL库了,这里返回的jsp只简单使用的c:out

    总结

    虽然Spring + SpringMVC + Mybatis 一起使用时,配置的文件较多,但却为我们后面编写控制层真的省了很多麻烦。就是一开始配置这么多xml,会头疼!

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