本文是由于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,但愿有更多人能够互相探讨,加入到一块儿来。css
Spring做为一个轻量级框架,开发使用已经有不少年了,很好用的底层框架。里面的IOC,AOP详细的我只能说会使用,不能给你们更详细的说明。java
Mybatis呢,主要是JDBC使用,链接数据库。它比起hibernate来讲我以为配置文件少了不少,不须要去配置什么数据库方言啊,乱七八糟的东西。mysql
SpringMvc感受更多的是像一个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。web
为何要用这个框架而不是传统的Spring+Struts+Hibernate呢? spring
传统的SSH以前也学习过,首先hibernate虽然很好用但是配置太过于复杂,不如Mybatis简单明了(Mybatis的动态sql语句我以为很实用);Struts呢太复杂!各类拦截器,处理缓存。真的配置都得配置好半天才能够。而SSM则简单了不少不少,适合小项目,本身联系时使用;sql
首先我使用的工具:数据库
编码软件:Eclipse 服务器:Tomcat 数据库:Mysqlspring-mvc
因为过多就不截图,自出省略......缓存
3.2.1 CustomerMapper中的方法名须要和CustomerMapper.xml中的id一致;服务器
3.2.2 在写CustomerMapper.xml时 咱们须要配置namespace 的路径是CustomerMapper.java的路径,在resultMap中须要说明JdbcType和javaType类型
3.2.3 编写service即实现
service类代码以下:
1 package com.vivebest.service; 2 3 import java.util.List; 4 5 import com.vivebest.entity.Customer; 6 7 public interface CustomerService { 8 public List<Customer> getAllCustomer(); 9 }
serviceImpl类代码以下
1 package com.vivebest.service.impl; 2 3 import java.util.List; 4 import org.springframework.beans.factory.annotation.Autowired; 5 import org.springframework.stereotype.Service; 6 import com.vivebest.dao.CustomerMapper; 7 import com.vivebest.entity.Customer; 8 import com.vivebest.service.CustomerService; 9 10 @Service("customerService") 11 public class CustomerServiceImpl implements CustomerService{ 12 13 @Autowired 14 private CustomerMapper customerMapper; 15 16 @Override 17 public List<Customer> getAllCustomer() { 18 // TODO Auto-generated method stub 19 return customerMapper.getAllCustomer(); 20 } 21 22 }
须要用到@service 和@Autowired .其中@service表明标示为服务层,@Autowired是Spring中自动装配使用,Spring会直接将UserDao类型的惟一一个bean赋值给userDao这个成员变量;
1 #DB 2 dataSource.driverClassName=com.mysql.jdbc.Driver 3 dataSource.url=jdbc:mysql://localhost:3306/? 4 dataSource.username = ? 5 dataSource.password = ? 6 7 dataSource.initialSize = 2 8 dataSource.maxActive = 30 9 dataSource.maxIdle = 2 10 dataSource.minIdle = 2 11 dataSource.maxOpenPreparedStatements = 150 12 dataSource.validationQuery = SELECT 1 FROM DUAL 13 dataSource.testWhileIdle = true 14 dataSource.testOnBorrow = false 15 dataSource.testOnReturn = false 16 # \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 17 dataSource.timeBetweenEvictionRunsMillis = 60000 18 # \u914d\u7f6e\u4e00\u4e2a\u8fde\u63a5\u5728\u6c60\u4e2d\u6700\u5c0f\u751f\u5b58\u7684\u65f6\u95f4\uff0c\u5355\u4f4d\u662f\u6beb\u79d2 19 dataSource.minEvictableIdleTimeMillis = 300000 20 # \u6253\u5f00PSCache\uff0c\u5e76\u4e14\u6307\u5b9a\u6bcf\u4e2a\u8fde\u63a5\u4e0aPSCache\u7684\u5927\u5c0f 21 dataSource.poolPreparedStatements = true 22 dataSource.maxPoolPreparedStatementPerConnectionSize = 20 23 # \u914d\u7f6e\u76d1\u63a7\u7edf\u8ba1\u62e6\u622a\u7684filter 24 dataSource.filters = stat
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" 4 xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc" 5 xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" 6 7 xsi:schemaLocation=" 8 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd 9 http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd 10 http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.0.xsd 11 http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd 12 http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd 13 http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd"> 14 <!-- 加载配置文件--> 15 <context:property-placeholder location="classpath:jdbc.properties"/> 16 <!-- 扫描控制包 --> 17 <context:component-scan base-package="com.vivebest.service" /> 18 19 <!-- ***************如下是dataSource 和 Mybatis配置****************** --> 20 <!-- dataSource --> 21 <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> 22 <property name="driverClassName" value="${dataSource.driverClassName}"/> 23 <property name="url" value="${dataSource.url}"/> 24 <property name="username" value="${dataSource.username}" /> 25 <property name="password" value="${dataSource.password}" /> 26 <property name="initialSize" value="${dataSource.initialSize}"/> 27 <property name="maxActive" value="${dataSource.maxActive}"/> 28 <property name="maxWait" value="30000"/> 29 <property name="maxIdle" value="${dataSource.maxIdle}"/> 30 <property name="minIdle" value="${dataSource.minIdle}"/> 31 <property name="validationQuery" value="${dataSource.validationQuery}"/> 32 <property name="testWhileIdle" value="${dataSource.testWhileIdle}"/> 33 <property name="testOnBorrow" value="${dataSource.testOnBorrow}"/> 34 <property name="testOnReturn" value="${dataSource.testOnReturn}"/> 35 <property name="timeBetweenEvictionRunsMillis" value="${dataSource.timeBetweenEvictionRunsMillis}" /> 36 <property name="minEvictableIdleTimeMillis" value="${dataSource.minEvictableIdleTimeMillis}" /> 37 <property name="poolPreparedStatements" value="${dataSource.poolPreparedStatements}" /> 38 <property name="maxPoolPreparedStatementPerConnectionSize" value="${dataSource.maxPoolPreparedStatementPerConnectionSize}" /> 39 <property name="filters" value="${dataSource.filters}" /> 40 </bean> 41 42 <!-- define the SqlSessionFactory --> 43 <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> 44 <property name="dataSource" ref="dataSource" /> 45 <property name="configLocation" value="classpath:mybatis-config.xml" /> 46 <!-- 要映射类的包路径 --> 47 <!-- <property name="typeAliasesPackage" value="com.vivebest.erp.entity" /> --> 48 <!-- 若无上条就须要有该配置 --> 49 <property name="mapperLocations" value="classpath:com/vivebest/mapper/CustomerMapper.xml"></property> <!-- 当配置文件在其余目录时 --> 50 </bean> 51 52 <!-- scan for mappers and let them be autowired --> 53 <!-- DAO接口所在包名,Spring会自动查找其下的类 --> 54 <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> 55 <property name="basePackage" value="com.vivebest.dao"/> 56 </bean> 57 58 </beans>
须要注意的是:value=“” 填写的是你*Mapper.xml文件的位置(个人是dao和mapper不在一个包下)
这样application就配置成功了。
1 <?xml version="1.0" encoding="UTF-8"?> 2 <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"> 3 <display-name>bankERP</display-name> 4 <!-- Spring 服务层的配置文件 --> 5 <context-param> 6 <param-name>contextConfigLocation</param-name> 7 <param-value>classpath:applicationContext.xml</param-value> 8 </context-param> 9 10 <!-- Spring 容器启动监听器 --> 11 <listener> 12 <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> 13 </listener> 14 17 <!-- 配置spring核心servlet --> 18 <servlet> 19 <servlet-name>spring</servlet-name> 20 <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 21 <init-param> 22 <param-name>contextConfigLocation</param-name> 23 <param-value>classpath:spring-mvc.xml</param-value> 24 </init-param> 25 <load-on-startup>1</load-on-startup> 26 </servlet> 27 28 <!-- url-pattern配置为/,不带文件后缀,会形成其它静态文件(js,css等)不能访问。如配为*.do,则不影响静态文件的访问 --> 29 <servlet-mapping> 30 <servlet-name>spring</servlet-name> 31 <url-pattern>*.do</url-pattern> 32 </servlet-mapping> 33 34 35 <!-- encode filter 支持中文转码 --> 36 <filter> 37 <filter-name>characterEncodingFilter</filter-name> 38 <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> 39 <init-param> 40 <param-name>encoding</param-name> 41 <param-value>UTF-8</param-value> 42 </init-param> 43 <init-param> 44 <param-name>forceEncoding</param-name> 45 <param-value>true</param-value> 46 </init-param> 47 </filter> 48 <filter-mapping> 49 <filter-name>characterEncodingFilter</filter-name> 50 <url-pattern>/*</url-pattern> 51 </filter-mapping> 52 57 </web-app>