MyBatis是ibatis的升級版,作爲hibernate的老對手,它 是一個可以自定義SQL、存儲過程和高級映射的持久層框架。
與hibernate的主要區別就是mybatis是半自動化的,而hibernate是全自動的,所以當應用需求越來越複雜的時候,自動化的sql顯得比較笨拙。
由於前段時間接了個項目要用springmvc做,所以我抱着練手的態度,又玩起了整合框架的遊戲。經常搭框架的人應該都清楚,框架搭建的核心就是配置文件。所以我主要貼下幾個配置文件的代碼。還是那句話,我都是寫好配置文件之後,運行報錯再加jar。這裏列一下我用的jar包(應該是最少的):
備註:上圖有一些額外的jar,比如我用的數據庫連接池是阿里巴巴的druid、日誌框架式logback,所以引入了相關jar。關於這兩個框架的使用和配置都是非常簡單的,所以這裏就不細說。
1.整合SpringMVC
springMybatis-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: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.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">
<!-- 啓用spring mvc 註解-->
<mvc:annotation-driven>
</mvc:annotation-driven>
<!-- 自動掃描的包名 ,使Spring支持自動檢測組件,如註解的Controller-->
<context:component-scan base-package="com.alibaba.controller" />
<context:component-scan base-package="com.alibaba.service"/>
<!-- 視圖解析器:定義跳轉的文件的前後綴 -->
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" /> <!--可爲空,方便實現自已的依據擴展名來選擇視圖解釋類的邏輯 -->
</bean>
<!--配置攔截器, 多個攔截器,順序執行 -->
<mvc:interceptors>
<mvc:interceptor>
<!-- 匹配的是url路徑 -->
<mvc:mapping path="/" />
<mvc:mapping path="/user/**" />
<mvc:mapping path="/test/**" />
<bean class="com.alibaba.interceptor.CommonInterceptor"></bean>
</mvc:interceptor>
<!-- 當設置多個攔截器時,先按順序調用preHandle方法,然後逆序調用每個攔截器的postHandle和afterCompletion方法 -->
</mvc:interceptors>
</beans>
2.整合Mybatis
spring-dao.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:mybatis="http://mybatis.org/schema/mybatis-spring"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://mybatis.org/schema/mybatis-spring http://mybatis.org/schema/mybatis-spring.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 該包下的類支持註解,表示會被當作{@code mybatis mapper}處理 配置了之後表示可以自動引入mapper類-->
<mybatis:scan base-package="com.alibaba.dao"/>
<!--引入屬性文件 -->
<context:property-placeholder location="classpath:configuration.properties"/>
<!--數據庫連接-->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
<!-- 配置初始化大小、最小、最大 -->
<property name="initialSize"><value>1</value></property>
<property name="maxActive"><value>5</value></property>
<property name="minIdle"><value>1</value></property>
<!-- 配置獲取連接等待超時的時間 -->
<property name="maxWait"><value>60000</value></property>
<!-- 配置監控統計攔截的filters -->
<property name="filters"><value>stat</value></property>
<!-- 配置間隔多久才進行一次檢測,檢測需要關閉的空閒連接,單位是毫秒 -->
<property name="timeBetweenEvictionRunsMillis"><value>60000</value></property>
<!-- 配置一個連接在池中最小生存的時間,單位是毫秒 -->
<property name="minEvictableIdleTimeMillis"><value>300000</value></property>
<!--
<property name="validationQuery"><value>SELECT 'x'</value></property>
<property name="testWhileIdle"><value>true</value></property>
<property name="testOnBorrow"><value>false</value></property>
<property name="testOnReturn"><value>false</value></property>
<property name="poolPreparedStatements"><value>true</value></property>
<property name="maxOpenPreparedStatements"><value>20</value></property>
-->
</bean>
<!-- mybatis配置 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
</bean>
</beans>
3.web.xml整合SpringMVC和Mybatis
<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
<!-- 該servlet爲tomcat,jetty等容器提供,將靜態資源映射從/改爲/static/目錄,如原來訪問 http://localhost/foo.css ,現在http://localhost/static/foo.css -->
<!-- 不攔截靜態文件 -->
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>/js/*</url-pattern>
<url-pattern>/css/*</url-pattern>
<url-pattern>/images/*</url-pattern>
<url-pattern>/fonts/*</url-pattern>
</servlet-mapping>
<!-- 配置字符集 -->
<filter>
<filter-name>encodingFilter</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>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- 初始化 DispatcherServlet時,該框架在 web應用程序WEB-INF目錄中尋找一個名爲[servlet-名稱]-servlet.xml的文件,
並在那裏定義相關的Beans,重寫在全局中定義的任何Beans -->
<servlet>
<servlet-name>springMybatis</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springMybatis</servlet-name>
<!-- 所有的的請求,都會被DispatcherServlet處理 -->
<url-pattern>/</url-pattern>
</servlet-mapping>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/config/spring-*.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- druid web 監控 -->
<servlet>
<servlet-name>DruidStatView</servlet-name>
<servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>DruidStatView</servlet-name>
<url-pattern>/druid/*</url-pattern>
</servlet-mapping>
<error-page>
<error-code>404</error-code>
<location>/error/404.jsp</location>
</error-page>
<error-page>
<error-code>500</error-code>
<location>/error/500.jsp</location>
</error-page>
</web-app>
4.logback.xml日誌配置
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
</encoder>
</appender>
<logger name="test.LogbackTest" level="TRACE"/>
<logger name="com.alibaba.controller.TestController" level="TRACE"/>
<logger name="org.springframework.web.servlet.DispatcherServlet" level="DEBUG" />
<logger name="druid.sql" level="INFO" /><!-- 如果spring-config裏面沒有配置slf4j,就不會顯示sql日誌,logback只是slf4j的一個實現 -->
<root level="debug">
<appender-ref ref="STDOUT" />
</root>
</configuration>
5.configuration.properties配置
jdbc.url=jdbc\:mysql\://localhost\:3306/druid?useUnicode\=true&characterEncoding\=UTF-8&zeroDateTimeBehavior\=convertToNull
jdbc.username=root
jdbc.password=123456
6.測試搭建是否成功,後臺代碼
首先是登錄,用了加密,可以去掉
package com.alibaba.controller;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.codec.digest.DigestUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import com.alibaba.model.User;
import com.alibaba.service.UserService;
import com.alibaba.util.RequestUtil;
/**
* @author tfj
* 2014-7-26
*/
@Controller
public class SystemController {
private final Logger log = LoggerFactory.getLogger(SystemController.class);
@Resource
private UserService userService;
@RequestMapping(value = "/",method = RequestMethod.GET)
public String home() {
log.info("返回首頁!");
return "index";
}
@RequestMapping(value = "/test/hello",method = RequestMethod.GET)
public String testHello() {
log.info("執行了testHello方法!");
return "testHello";
}
@RequestMapping(value = "/login",method = RequestMethod.POST)
public String testLogin(HttpServletRequest request,@RequestParam String username, @RequestParam String password) {
log.info("執行了testLogin方法!");
User user = userService.findUserByName(username);
if(user!=null){
if(user.getPassword().equals(DigestUtils.md5Hex(password))){
request.getSession().setAttribute("userId", user.getId());
request.getSession().setAttribute("user", username);
return "redirect:" + RequestUtil.retrieveSavedRequest();//跳轉至訪問頁面
}else{
log.info("密碼錯誤");
request.getSession().setAttribute("message", "用戶名密碼錯誤,請重新登錄");
return "login";
}
}else{
log.info("用戶名不存在");
request.getSession().setAttribute("message", "用戶名不存在,請重新登錄");
return "login";
}
}
}
關於service和model就不寫了,寫一下mybatis的mapper類映射
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.alibaba.dao.UserMapper">
<select id="findUserByName" resultType="com.alibaba.model.User">
select id, username , password from sysuser where username = #{username}
</select>
</mapper>
7.前臺jsp主要是登錄和登錄成功的頁面,就不寫了
貼一下截圖:
到此,springmvc+mybatis整合成功。後續複雜的功能待添加
注意事項
1.框架中關於druid和logback的配置都是從官網上copy下來的,所以都是最基本的,讀者可以忽略,也可以換成讀者熟悉的數據庫組件和日誌框架,如c3p0和log4j。
2.代碼里加入了權限管理,即訪問前需登錄,登錄後跳轉至待訪問頁面,關於springmvc的權限管理請看:http://blog.csdn.net/tonytfjing/article/details/39207551
3.本文是從我的測試代碼裏剝離出來的最簡單的也是最基本的代碼,有些沒剝離乾淨的地方還請見諒。