在之前的文章中總結(jié)了三種方式,但是有兩種是注解sql的,這種方式比較混亂所以大家不怎么使用,下面總結(jié)一下常用的兩種總結(jié)方式:
一、 動(dòng)態(tài)代理實(shí)現(xiàn) 不用寫dao的實(shí)現(xiàn)類
這種方式比較簡單,不用實(shí)現(xiàn)dao層,只需要定義接口就可以了,這里只是為了記錄配置文件所以程序?qū)懙暮芎唵危?/p>
1、整體結(jié)構(gòu)圖:
2、三個(gè)配置文件以及一個(gè)映射文件
(1)、程序入口以及前端控制器配置 web.xml
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<?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>website1</display-name> <!-- 設(shè)置監(jiān)聽,在web容器啟動(dòng)時(shí)自動(dòng)裝配applicationcontext的配置信息--> <listener> </listener> <!-- 設(shè)置spring容器加載配置文件路徑 --> <context-param> <param-name>contextconfiglocation</param-name> <param-value> classpath:config/springmvc-servlet.xml, classpath:config/applicationcontext.xml </param-value> </context-param> <!-- 字符編碼過濾器 --> <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>*. do </url-pattern> </filter-mapping> <!-- 前端控制器 --> <servlet> <servlet-name>springmvc</servlet-name> <servlet- class >org.springframework.web.servlet.dispatcherservlet</servlet- class > <init-param> <param-name>contextconfiglocation</param-name> <param-value>classpath:config/springmvc-servlet.xml</param-value> </init-param> <!-- 這個(gè)配置文件在容器啟動(dòng)的時(shí)候 就加載 --> <load-on-startup> 1 </load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <!-- 攔截請(qǐng)求 --> <url-pattern>*. do </url-pattern> </servlet-mapping> <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> </web-app> |
(2)、掃描控制層、自動(dòng)注入以及視圖解析器的配置 springmvc-servlet.xml
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<?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:context= "http://www.springframework.org/schema/context" xmlns:mvc= "http://www.springframework.org/schema/mvc" xmlns:util= "http://www.springframework.org/schema/util" xmlns:tx= "http://www.springframework.org/schema/tx" xmlns:jdbc= "http://www.springframework.org/schema/jdbc" xmlns:cache= "http://www.springframework.org/schema/cache" xsi:schemalocation=" http: //www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http: //www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd http: //www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http: //www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd http: //www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsd http: //www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd http: //www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd http: //www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache-3.1.xsd"> <!-- 注解驅(qū)動(dòng) --> <mvc:annotation-driven /> <!-- <context:annotation-config /> --> <!-- context:component-scan 具有annotation-config 的功能 --> <!-- 掃描 控制層 --> <context:component-scan base- package = "com.website.controller" ></context:component-scan> <!-- 視圖解析器 --> <bean id= "viewresolver" class = "org.springframework.web.servlet.view.internalresourceviewresolver" > <property name= "prefix" value= "/web-inf/view/" > </property> <property name= "suffix" value= ".jsp" ></property> </bean> </beans> |
(3)、數(shù)據(jù)源、service 自動(dòng)掃描注入、spring代管mybatissqlsessionfactory 、dao層接口動(dòng)態(tài)代理以及事務(wù)的配置applicationcontext.xml
這里會(huì)有多中配置文件
1)、單數(shù)據(jù)源,動(dòng)態(tài)代理實(shí)現(xiàn)dao層接口時(shí)不設(shè)置sqlsessionfactorybeanname、或sqlsessiontemplatebeanname 兩個(gè)屬性的值
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<?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:tx= "http://www.springframework.org/schema/tx" xmlns:context= "http://www.springframework.org/schema/context" xsi:schemalocation="http: //www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http: //www.springframework.org/schema/context http: //www.springframework.org/schema/context/spring-context-3.2.xsd http: //www.springframework.org/schema/tx http: //www.springframework.org/schema/tx/spring-tx-3.2.xsd"> <!-- 加載配置jdbc文件 --> <context:property-placeholder location= "classpath:db.properties" /> <!-- 數(shù)據(jù)源 --> <bean id= "datasource" class = "org.springframework.jdbc.datasource.drivermanagerdatasource" > <property name= "driverclassname" > <value>${jdbc.driverclassname}</value> </property> <property name= "url" > <value>${jdbc.url}</value> </property> <property name= "username" > <value>${jdbc.username}</value> </property> <property name= "password" > <value>${jdbc.password}</value> </property> </bean> <!-- 開啟注解配置 即autowried --> <!-- <context:annotation-config/> --> <!--其實(shí)component-scan 就有了annotation-config的功能即把需要的類注冊(cè)到了spring容器中 --> <context:component-scan base- package = "com.website.service" /> <!-- 在使用mybatis時(shí) spring使用sqlsessionfactorybean 來管理mybatis的sqlsessionfactory --> <bean id= "sqlsessionfactory" class = "org.mybatis.spring.sqlsessionfactorybean" > <property name= "datasource" ref= "datasource" /> <!-- mybatis配置文件路徑 --> <property name= "configlocation" value= "" /> <!-- 實(shí)體類映射文件路徑,這里只有一個(gè)就寫死了,多個(gè)可以使用mybatis/*.xml來替代 --> <property name= "mapperlocations" value= "classpath:mybatis/usermapper.xml" /> </bean> <!-- <bean id= "sqlsession" class = "org.mybatis.spring.sqlsessiontemplate" > <constructor-arg index= "0" > <ref bean= "sqlsessionfactory" /> </constructor-arg> </bean> --> <!--動(dòng)態(tài)代理實(shí)現(xiàn) 不用寫dao的實(shí)現(xiàn) --> <bean id= "mapperscannerconfigurer" class = "org.mybatis.spring.mapper.mapperscannerconfigurer" > <!-- 這里的basepackage 指定了dao層接口路勁,這里的dao接口不用自己實(shí)現(xiàn) --> <property name= "basepackage" value= "com.website.dao" /> <!-- 如果只有一個(gè)數(shù)據(jù)源的話可以不用指定,但是如果有多個(gè)數(shù)據(jù)源的話必須要指定 --> <!-- <property name= "sqlsessionfactorybeanname" value= "sqlsessionfactory" /> --> <!--直接指定了sqlsessiontemplate名稱,這個(gè)和上面的其實(shí)是一樣的 --> <!-- <property name= "sqlsessiontemplatebeanname" value= "sqlsession" /> --> </bean> <!--事務(wù)管理器 --> <bean id= "transactionmanager" class = "org.springframework.jdbc.datasource.datasourcetransactionmanager" > <property name= "datasource" ref= "datasource" /> </bean> <!-- 使用全注釋事務(wù) --> <tx:annotation-driven transaction-manager= "transactionmanager" /> </beans> |
2)、單數(shù)據(jù)源配置 sqlsessionfactorybeanname 這個(gè)屬性值
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<?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:tx= "http://www.springframework.org/schema/tx" xmlns:context= "http://www.springframework.org/schema/context" xsi:schemalocation="http: //www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http: //www.springframework.org/schema/context http: //www.springframework.org/schema/context/spring-context-3.2.xsd http: //www.springframework.org/schema/tx http: //www.springframework.org/schema/tx/spring-tx-3.2.xsd"> <!-- 加載配置jdbc文件 --> <context:property-placeholder location= "classpath:db.properties" /> <!-- 數(shù)據(jù)源 --> <bean id= "datasource" class = "org.springframework.jdbc.datasource.drivermanagerdatasource" > <property name= "driverclassname" > <value>${jdbc.driverclassname}</value> </property> <property name= "url" > <value>${jdbc.url}</value> </property> <property name= "username" > <value>${jdbc.username}</value> </property> <property name= "password" > <value>${jdbc.password}</value> </property> </bean> <!-- 開啟注解配置 即autowried --> <!-- <context:annotation-config/> --> <!--其實(shí)component-scan 就有了annotation-config的功能即把需要的類注冊(cè)到了spring容器中 --> <context:component-scan base- package = "com.website.service" /> <!-- 在使用mybatis時(shí) spring使用sqlsessionfactorybean 來管理mybatis的sqlsessionfactory --> <bean id= "sqlsessionfactory" class = "org.mybatis.spring.sqlsessionfactorybean" > <property name= "datasource" ref= "datasource" /> <!-- mybatis配置文件路徑 --> <property name= "configlocation" value= "" /> <!-- 實(shí)體類映射文件路徑,這里只有一個(gè)就寫死了,多個(gè)可以使用mybatis/*.xml來替代 --> <property name= "mapperlocations" value= "classpath:mybatis/usermapper.xml" /> </bean> <!-- <bean id= "sqlsession" class = "org.mybatis.spring.sqlsessiontemplate" > <constructor-arg index= "0" > <ref bean= "sqlsessionfactory" /> </constructor-arg> </bean> --> <!--動(dòng)態(tài)代理實(shí)現(xiàn) 不用寫dao的實(shí)現(xiàn) --> <bean id= "mapperscannerconfigurer" class = "org.mybatis.spring.mapper.mapperscannerconfigurer" > <!-- 這里的basepackage 指定了dao層接口路勁,這里的dao接口不用自己實(shí)現(xiàn) --> <property name= "basepackage" value= "com.website.dao" /> <!-- 如果只有一個(gè)數(shù)據(jù)源的話可以不用指定,但是如果有多個(gè)數(shù)據(jù)源的話必須要指定 --> <property name= "sqlsessionfactorybeanname" value= "sqlsessionfactory" /> <!--直接制定了sqlsessiontemplate名稱,這個(gè)和上面的其實(shí)是一樣的 --> <!-- <property name= "sqlsessiontemplatebeanname" value= "sqlsession" /> --> </bean> <!--事務(wù)管理器 --> <bean id= "transactionmanager" class = "org.springframework.jdbc.datasource.datasourcetransactionmanager" > <property name= "datasource" ref= "datasource" /> </bean> <!-- 使用全注釋事務(wù) --> <tx:annotation-driven transaction-manager= "transactionmanager" /> </beans> |
3)、單數(shù)據(jù)源配置sqlsessiontemplatebeanname 這個(gè)屬性值
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<?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:tx= "http://www.springframework.org/schema/tx" xmlns:context= "http://www.springframework.org/schema/context" xsi:schemalocation="http: //www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http: //www.springframework.org/schema/context http: //www.springframework.org/schema/context/spring-context-3.2.xsd http: //www.springframework.org/schema/tx http: //www.springframework.org/schema/tx/spring-tx-3.2.xsd"> <!-- 加載配置jdbc文件 --> <context:property-placeholder location= "classpath:db.properties" /> <!-- 數(shù)據(jù)源 --> <bean id= "datasource" class = "org.springframework.jdbc.datasource.drivermanagerdatasource" > <property name= "driverclassname" > <value>${jdbc.driverclassname}</value> </property> <property name= "url" > <value>${jdbc.url}</value> </property> <property name= "username" > <value>${jdbc.username}</value> </property> <property name= "password" > <value>${jdbc.password}</value> </property> </bean> <!-- 開啟注解配置 即autowried --> <!-- <context:annotation-config/> --> <!--其實(shí)component-scan 就有了annotation-config的功能即把需要的類注冊(cè)到了spring容器中 --> <context:component-scan base- package = "com.website.service" /> <!-- 在使用mybatis時(shí) spring使用sqlsessionfactorybean 來管理mybatis的sqlsessionfactory --> <bean id= "sqlsessionfactory" class = "org.mybatis.spring.sqlsessionfactorybean" > <property name= "datasource" ref= "datasource" /> <!-- mybatis配置文件路徑 --> <property name= "configlocation" value= "" /> <!-- 實(shí)體類映射文件路徑,這里只有一個(gè)就寫死了,多個(gè)可以使用mybatis/*.xml來替代 --> <property name= "mapperlocations" value= "classpath:mybatis/usermapper.xml" /> </bean> <bean id= "sqlsession" class = "org.mybatis.spring.sqlsessiontemplate" > <constructor-arg index= "0" > <ref bean= "sqlsessionfactory" /> </constructor-arg> </bean> <!--動(dòng)態(tài)代理實(shí)現(xiàn) 不用寫dao的實(shí)現(xiàn) --> <bean id= "mapperscannerconfigurer" class = "org.mybatis.spring.mapper.mapperscannerconfigurer" > <!-- 這里的basepackage 指定了dao層接口路勁,這里的dao接口不用自己實(shí)現(xiàn) --> <property name= "basepackage" value= "com.website.dao" /> <!-- 如果只有一個(gè)數(shù)據(jù)源的話可以不用指定,但是如果有多個(gè)數(shù)據(jù)源的話必須要指定 --> <!-- <property name= "sqlsessionfactorybeanname" value= "sqlsessionfactory" /> --> <!--直接制定了sqlsessiontemplate名稱,這個(gè)和上面的其實(shí)是一樣的 --> <property name= "sqlsessiontemplatebeanname" value= "sqlsession" /> </bean> <!--事務(wù)管理器 --> <bean id= "transactionmanager" class = "org.springframework.jdbc.datasource.datasourcetransactionmanager" > <property name= "datasource" ref= "datasource" /> </bean> <!-- 使用全注釋事務(wù) --> <tx:annotation-driven transaction-manager= "transactionmanager" /> </beans> |
4)、多數(shù)據(jù)源
注意如果是多數(shù)據(jù)源則一定要使用sqlsessionfactorybeanname 或sqlsessiontemplatebeanname 來指定具體的數(shù)據(jù)源,不知道在上面的配置中有沒有注意到,如果使用sqlsessiontemplatebeanname 的話要
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<bean id= "sqlsession" class = "org.mybatis.spring.sqlsessiontemplate" > <constructor-arg index= "0" > <ref bean= "sqlsessionfactory" /> </constructor-arg> </bean> |
來創(chuàng)建具體的實(shí)例并賦值給sqlsessiontemplatebeanname 這個(gè)屬性。
(4)、mybatis sql映射文件 usermapper.xml:
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<?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" > <!-- namespace的值就是dao接口的完整路勁,就這個(gè)demo而言namespace 就是userdao.java的完整路勁 --> <mapper namespace= "com.website.dao.userdao" > <!-- 這里的id就是接口中方法的名稱 --> <insert id= "saveuser" parametertype= "java.util.map" > insert into user(id,name) values(#{id},#{name}) </insert> </mapper> |
ok 到這里配置文件到搞定了下面來看看控制層,業(yè)務(wù)邏輯層以及dao層的代碼。
3、controller層
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package com.website.controller; import java.util.hashmap; import java.util.map; import javax.servlet.http.httpservletrequest; import javax.servlet.http.httpservletresponse; import org.springframework.beans.factory.annotation.autowired; import org.springframework.stereotype.controller; import org.springframework.web.bind.annotation.requestmapping; import org.springframework.web.bind.annotation.requestmethod; import com.website.service.userservice; @controller @requestmapping (value = "/user" ) public class usercontroller { // 注入userservice 對(duì)象 @autowired private userservice userservice; @requestmapping (value = "/save.do" , method = requestmethod.get) public string saveuser(httpservletrequest request, httpservletresponse response) { string id = request.getparameter( "id" ); string name = request.getparameter( "name" ); map<string, string> map = new hashmap<string, string>(); map.put( "id" , id); map.put( "name" , name); userservice.saveuser(map); return "index" ; } } |
4、service層
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package com.website.service; import java.util.map; import org.springframework.beans.factory.annotation.autowired; import org.springframework.stereotype.service; import org.springframework.transaction.annotation.transactional; import com.website.dao.userdao; @service ( "userservice" ) @transactional public class userservice { // 注入dao接口實(shí)現(xiàn)類實(shí)例 // @resource、@autowired兩種注入方式都可以 @autowired private userdao userdao; public void saveuser(map<string, string> map) { int end = userdao.saveuser(map); system.out.println( "end:" + end); } } |
5、dao 層 接口
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package com.website.dao; import java.util.map; //com.website.dao.userdao public interface userdao { int saveuser(map<string, string> map); } |
dao 接口的完整路勁就是這個(gè)dao 接口對(duì)應(yīng)的那個(gè)映射文件的namespace 而方法名就是 id的值
ok到這里這種配置方式都完了,也有了一個(gè)完整的小demo,下面我們簡單總結(jié)一下:
這種配置方式相比之前的配置方式(下面也會(huì)寫出來)特別之處就是他使用了dao層接口的動(dòng)態(tài)代理方式實(shí)現(xiàn)了,之前我們會(huì)在dao層自己手動(dòng)實(shí)現(xiàn)dao層然后自動(dòng)注入sqlsessiontemplate 實(shí)例來調(diào)用具體的方法 比如 insert("","") selectone("","") 等方法 其中第一個(gè)參數(shù)就是映射文件的地址: namespace+id 而第二個(gè)參數(shù)就是傳遞的條件這樣mybatis 就會(huì)按照我們傳遞的這兩個(gè)參數(shù)找到具體的映射文件進(jìn)行解析查詢。而這里使用動(dòng)態(tài)代理就省去了我們實(shí)現(xiàn)dao接口的這一步驟,而是由spring提我們實(shí)現(xiàn)了,那有個(gè)問題,查詢條件參數(shù)我們傳遞了,但映射文件的具體路徑即:namespce+id 沒有傳遞怎么辦,那就是你的映射文件的namespace 必須是接口的類全名稱而id 必須是接口中的方法名稱,這樣動(dòng)態(tài)代理就能找到路勁了也有了參數(shù)了。 這樣一來是不是覺得就一樣了啊哈哈哈!
二、手動(dòng)實(shí)現(xiàn)dao層接口
下面先來看看手動(dòng)實(shí)現(xiàn)dao層的配置以及代碼:
1、正題結(jié)構(gòu)圖
2、三個(gè)配置文件以及映射文件
(1)、程序入口,前端控制器配置 web.xml
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<?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>website2</display-name> <!-- 加載spring容器配置 --> <listener> <listener- class >org.springframework.web.context.contextloaderlistener</listener- class > </listener> <!-- 設(shè)置spring容器加載配置文件路徑 --> <context-param> <param-name>contextconfiglocation</param-name> <param-value> classpath:config/springmvc-servlet.xml, classpath:config/applicationcontext.xml </param-value> </context-param> <!-- 字符編碼過濾器 --> <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>*. do </url-pattern> </filter-mapping> <!-- 前端控制器 --> <servlet> <servlet-name>springmvc</servlet-name> <servlet- class >org.springframework.web.servlet.dispatcherservlet</servlet- class > <init-param> <param-name>contextconfiglocation</param-name> <param-value>classpath:config/springmvc-servlet.xml</param-value> </init-param> <!-- 這個(gè)配置文件在容器啟動(dòng)的時(shí)候 就加載 --> <load-on-startup> 1 </load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <!-- 攔截請(qǐng)求 --> <url-pattern>*. do </url-pattern> </servlet-mapping> <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> </web-app> |
(2)、掃描控制層、自動(dòng)注入以及視圖解析器的配置 springmvc-servlet.xml
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<?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:context= "http://www.springframework.org/schema/context" xmlns:mvc= "http://www.springframework.org/schema/mvc" xmlns:util= "http://www.springframework.org/schema/util" xmlns:tx= "http://www.springframework.org/schema/tx" xmlns:jdbc= "http://www.springframework.org/schema/jdbc" xmlns:cache= "http://www.springframework.org/schema/cache" xsi:schemalocation=" http: //www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http: //www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd http: //www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http: //www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd http: //www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsd http: //www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd http: //www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd http: //www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache-3.1.xsd"> <!-- 注解驅(qū)動(dòng) --> <mvc:annotation-driven /> <!-- <context:annotation-config /> --> <!-- 掃描 --> <context:component-scan base- package = "com.website.controller" ></context:component-scan> <!-- 視圖解析器 --> <bean id= "viewresolver" class = "org.springframework.web.servlet.view.internalresourceviewresolver" > <property name= "prefix" value= "/web-inf/view/" > </property> <property name= "suffix" value= ".jsp" ></property> </bean> </beans> |
(3)、數(shù)據(jù)源、service 自動(dòng)掃描注入、spring代管mybatissqlsessionfactory 以及事務(wù)的配置applicationcontext.xml
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<?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:tx= "http://www.springframework.org/schema/tx" xmlns:context= "http://www.springframework.org/schema/context" xsi:schemalocation="http: //www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http: //www.springframework.org/schema/context http: //www.springframework.org/schema/context/spring-context-3.2.xsd http: //www.springframework.org/schema/tx http: //www.springframework.org/schema/tx/spring-tx-3.2.xsd"> <!-- 加載配置jdbc文件 --> <context:property-placeholder location= "classpath:db.properties" /> <!-- 數(shù)據(jù)源 --> <bean id= "datasource" class = "org.springframework.jdbc.datasource.drivermanagerdatasource" > <property name= "driverclassname" > <value>${jdbc.driverclassname}</value> </property> <property name= "url" > <value>${jdbc.url}</value> </property> <property name= "username" > <value>${jdbc.username}</value> </property> <property name= "password" > <value>${jdbc.password}</value> </property> </bean> <!-- 開啟注解配置 即autowried --> <!--component-scan擁有 annotation-config的功能即注入需要的類到spring容器中 --> <!--<context:annotation-config/> --> <!--使用自動(dòng)注入的時(shí)候要 添加他來掃描bean之后才能在使用的時(shí)候 --> <context:component-scan base- package = "com.website.service ,com.website.dao" /> <!-- 在使用mybatis時(shí) spring使用sqlsessionfactorybean 來管理mybatis的sqlsessionfactory --> <!-- 而像這種使用接口實(shí)現(xiàn)的方式 是使用sqlsessiontemplate來進(jìn)行操作的,他提供了一些方法 --> <bean id= "sqlsessionfactory" class = "org.mybatis.spring.sqlsessionfactorybean" > <property name= "datasource" ref= "datasource" /> <!-- mybatis配置文件路徑 --> <property name= "configlocation" value= "" /> <!-- 實(shí)體類映射文件路徑,在開發(fā)中映射文件肯定是多個(gè)所以使用mybatis/*.xml來替代 --> <property name= "mapperlocations" value= "classpath:mybatis/usermapping.xml" /> </bean> <!--其實(shí)這里類的實(shí)例就是mybatis中sqlsession --> <bean id= "sqlsession" class = "org.mybatis.spring.sqlsessiontemplate" > <constructor-arg index= "0" > <ref bean= "sqlsessionfactory" /> </constructor-arg> </bean> <bean id= "transactionmanager" class = "org.springframework.jdbc.datasource.datasourcetransactionmanager" > <property name= "datasource" ref= "datasource" /> </bean> <!--使用全注釋事務(wù) --> <tx:annotation-driven transaction-manager= "transactionmanager" /> </beans> |
(4)、mybatis 映射文件
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<?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" > <!--這個(gè)namespace + 下面的id 就是一個(gè)完整的路徑,在dao層我們寫了完整的路徑之后mybatis就是映射這個(gè)文件中的相關(guān)sql語句 --> <mapper namespace= "com.website.usermapper" > <!-- parametertype就是你接受的參數(shù)的類型, --> <!-- 添加用戶信息 --> <insert id= "insertuser" parametertype= "java.util.map" > insert into user(id,name,password) values(#{id},#{name},#{password}) </insert> </mapper> |
你可能看到了這里的映射文件的namespace +id 是自定義的而不是dao 層接口的全類名+id
3、控制層controller
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package com.website.controller; import java.util.hashmap; import java.util.map; import javax.servlet.http.httpservletrequest; import javax.servlet.http.httpservletresponse; import org.springframework.beans.factory.annotation.autowired; import org.springframework.stereotype.controller; import org.springframework.web.bind.annotation.requestmapping; import com.website.service.userservice; /** * @author whd data 2016年6月5日 */ @controller @requestmapping (value = "/user" ) public class usercontroller { @autowired private userservice userservice; @requestmapping (value = "/save.do" ) public string saveuser(httpservletrequest request, httpservletresponse response) { string id = request.getparameter( "id" ); string name = request.getparameter( "name" ); string password = request.getparameter( "password" ); map<string, string> map = new hashmap<string, string>(); map.put( "id" , id); map.put( "name" , name); map.put( "password" , password); userservice.saveuser(map); return "index" ; } } |
4、業(yè)務(wù)邏輯層 service
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package com.website.service; import java.util.map; import org.springframework.beans.factory.annotation.autowired; import org.springframework.stereotype.service; import org.springframework.transaction.annotation.transactional; import com.website.dao.userdao; /** * @author whd data 2016年6月5日 */ @service ( "userservice" ) @transactional public class userservice { @autowired private userdao userdao; public void saveuser(map<string, string> map) { userdao.saveuser(map); } } |
5、dao層
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package com.website.dao; import java.util.map; import org.mybatis.spring.sqlsessiontemplate; import org.springframework.beans.factory.annotation.autowired; import org.springframework.stereotype.repository; /** * @author whd data 2016年6月5日 */ @repository ( "userdao" ) public class userdao { @autowired private sqlsessiontemplate sqlsession; public void saveuser(map<string, string> map) { int end = sqlsession.insert( "com.website.usermapper.insertuser" , map); system.out.println( "end" + end); } } |
我們看倒dao層的 sqlsessiontemplate 這個(gè)其實(shí)是mybatis中的sqlsession 對(duì)象,我們看到在applicationcontext.xml 中配置了,所以在我們使用時(shí)spring會(huì)幫我們自動(dòng)注入,我們直接使用就可以了不用去自己創(chuàng)建,這也就是所謂的控制反轉(zhuǎn)。ok 到此兩種文件的配置方式就結(jié)束了。
總結(jié)
以上所述是小編給大家介紹的spring、mybatis 配置方式詳解(常用兩種方式),希望對(duì)大家有所幫助,如果大家有任何疑問請(qǐng)給我留言,小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)服務(wù)器之家網(wǎng)站的支持!
原文鏈接:http://blog.csdn.net/QH_JAVA/article/details/51601139