Spring+SpringMvc+Mybatis 框架的搭建(一)

时间:2023-03-10 01:35:22
Spring+SpringMvc+Mybatis 框架的搭建(一)

本文是因为实习结束后学习到了新的技术,想写下来和更多人交流。开发中遇到的问题我也会一一说明,希望有更多人可以互相探讨,加入到一起来。

1. Spring+SpringMvc +Mybatis 的作用有哪些:

  Spring作为一个轻量级框架,开发使用已经有很多年了,很好用的底层框架。里面的IOC,AOP详细的我只能说会使用,不能给大家更详细的说明。

  Mybatis呢,主要是JDBC使用,连接数据库。它比起hibernate来说我觉得配置文件少了很多,不需要去配置什么数据库方言啊,乱七八糟的东西。

  SpringMvc感觉更多的是像一个Spring精简升级版,它里面的应该就是配置文件中的启动注解还有视图的配置吧。

为什么要用这个框架而不是传统的Spring+Struts+Hibernate呢?

  传统的SSH之前也学习过,首先hibernate虽然很好用可是配置太过于复杂,不如Mybatis简单明了(Mybatis的动态sql语句我觉得很实用);Struts呢太复杂!各种拦截器,处理缓存。真的配置都得配置好半天才可以。而SSM则简单了很多很多,适合小项目,自己联系时使用;

2.项目的配置:

  首先我使用的工具:

  编码软件:Eclipse  服务器:Tomcat  数据库:Mysql

  2.1在Eclipse中建立web工程

       Spring+SpringMvc+Mybatis 框架的搭建(一)

  2.2添加相应的架包

    由于过多就不截图,自出省略......

  2.3 建立数据库表

  Spring+SpringMvc+Mybatis 框架的搭建(一)

 3.项目的开发

  3.1 首先我们需要将src中的po类至Service层写好 顺序为entity—dao—mapper—Service

  Spring+SpringMvc+Mybatis 框架的搭建(一)

  3.2 这里面需要注意的事项:

    3.2.1 CustomerMapper中的方法名需要和CustomerMapper.xml中的id一致;

    Spring+SpringMvc+Mybatis 框架的搭建(一)Spring+SpringMvc+Mybatis 框架的搭建(一)

      3.2.2  在写CustomerMapper.xml时 我们需要配置namespace 的路径是CustomerMapper.java的路径,在resultMap中需要说明JdbcType和javaType类型

  Spring+SpringMvc+Mybatis 框架的搭建(一)

   3.2.3 编写service即实现 

      service类代码如下:

 package com.vivebest.service;

 import java.util.List;

 import com.vivebest.entity.Customer;

 public interface CustomerService {
public List<Customer> getAllCustomer();
}

        serviceImpl类代码如下

 package com.vivebest.service.impl;

 import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.vivebest.dao.CustomerMapper;
import com.vivebest.entity.Customer;
import com.vivebest.service.CustomerService; @Service("customerService")
public class CustomerServiceImpl implements CustomerService{ @Autowired
private CustomerMapper customerMapper; @Override
public List<Customer> getAllCustomer() {
// TODO Auto-generated method stub
return customerMapper.getAllCustomer();
} }

需要用到@service 和@Autowired .其中@service代表标示为服务层,@Autowired是Spring中自动装配使用,Spring会直接将UserDao类型的唯一一个bean赋值给userDao这个成员变量;

Spring+SpringMvc+Mybatis 框架的搭建(一)

4.配置文件的配置

  Spring+SpringMvc+Mybatis 框架的搭建(一)

  4.1  jdbc.properties :主要是用来配置数据库信息

 #DB
dataSource.driverClassName=com.mysql.jdbc.Driver
dataSource.url=jdbc:mysql://localhost:3306/?
dataSource.username = ?
dataSource.password = ? dataSource.initialSize = 2
dataSource.maxActive = 30
dataSource.maxIdle = 2
dataSource.minIdle = 2
dataSource.maxOpenPreparedStatements = 150
dataSource.validationQuery = SELECT 1 FROM DUAL
dataSource.testWhileIdle = true
dataSource.testOnBorrow = false
dataSource.testOnReturn = false
# \u914d\u7f6e\u95f4\u9694\u591a\u4e45\u624d\u8fdb\u884c\u4e00\u6b21\u68c0\u6d4b\uff0c\u68c0\u6d4b\u9700\u8981\u5173\u95ed\u7684\u7a7a\u95f2\u8fde\u63a5\uff0c\u5355\u4f4d\u662f\u6beb\u79d2
dataSource.timeBetweenEvictionRunsMillis = 60000
# \u914d\u7f6e\u4e00\u4e2a\u8fde\u63a5\u5728\u6c60\u4e2d\u6700\u5c0f\u751f\u5b58\u7684\u65f6\u95f4\uff0c\u5355\u4f4d\u662f\u6beb\u79d2
dataSource.minEvictableIdleTimeMillis = 300000
# \u6253\u5f00PSCache\uff0c\u5e76\u4e14\u6307\u5b9a\u6bcf\u4e2a\u8fde\u63a5\u4e0aPSCache\u7684\u5927\u5c0f
dataSource.poolPreparedStatements = true
dataSource.maxPoolPreparedStatementPerConnectionSize = 20
# \u914d\u7f6e\u76d1\u63a7\u7edf\u8ba1\u62e6\u622a\u7684filter
dataSource.filters = stat

  4.2 applicationContext.xml :主要是用来配置Spring和Mybatis

 <?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:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
<!-- 加载配置文件-->
<context:property-placeholder location="classpath:jdbc.properties"/>
<!-- 扫描控制包 -->
<context:component-scan base-package="com.vivebest.service" /> <!-- ***************以下是dataSource 和 Mybatis配置****************** -->
<!-- dataSource -->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
<property name="driverClassName" value="${dataSource.driverClassName}"/>
<property name="url" value="${dataSource.url}"/>
<property name="username" value="${dataSource.username}" />
<property name="password" value="${dataSource.password}" />
<property name="initialSize" value="${dataSource.initialSize}"/>
<property name="maxActive" value="${dataSource.maxActive}"/>
<property name="maxWait" value="30000"/>
<property name="maxIdle" value="${dataSource.maxIdle}"/>
<property name="minIdle" value="${dataSource.minIdle}"/>
<property name="validationQuery" value="${dataSource.validationQuery}"/>
<property name="testWhileIdle" value="${dataSource.testWhileIdle}"/>
<property name="testOnBorrow" value="${dataSource.testOnBorrow}"/>
<property name="testOnReturn" value="${dataSource.testOnReturn}"/>
<property name="timeBetweenEvictionRunsMillis" value="${dataSource.timeBetweenEvictionRunsMillis}" />
<property name="minEvictableIdleTimeMillis" value="${dataSource.minEvictableIdleTimeMillis}" />
<property name="poolPreparedStatements" value="${dataSource.poolPreparedStatements}" />
<property name="maxPoolPreparedStatementPerConnectionSize" value="${dataSource.maxPoolPreparedStatementPerConnectionSize}" />
<property name="filters" value="${dataSource.filters}" />
</bean> <!-- define the SqlSessionFactory -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="configLocation" value="classpath:mybatis-config.xml" />
<!-- 要映射类的包路径 -->
<!-- <property name="typeAliasesPackage" value="com.vivebest.erp.entity" /> -->
<!-- 若无上条就需要有该配置 -->
<property name="mapperLocations" value="classpath:com/vivebest/mapper/CustomerMapper.xml"></property> <!-- 当配置文件在其他目录时 -->
</bean> <!-- scan for mappers and let them be autowired -->
<!-- DAO接口所在包名,Spring会自动查找其下的类 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.vivebest.dao"/>
</bean> </beans>

需要注意的是:value=“” 填写的是你*Mapper.xml文件的位置(我的是dao和mapper不在一个包下)

Spring+SpringMvc+Mybatis 框架的搭建(一)

Spring+SpringMvc+Mybatis 框架的搭建(一)

这样application就配置成功了。

4.3 web.xml配置(主要为配置Spring)

 <?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>bankERP</display-name>
<!-- Spring 服务层的配置文件 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param> <!-- Spring 容器启动监听器 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener> <!-- 配置spring核心servlet -->
<servlet>
<servlet-name>spring</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> <!-- url-pattern配置为/,不带文件后缀,会造成其它静态文件(js,css等)不能访问。如配为*.do,则不影响静态文件的访问 -->
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping> <!-- encode filter 支持中文转码 -->
<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>
</web-app>