Struts2如何实现Struts2与Spring的整合 外加 MyBatis 框架
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1,简介
一般没有人会用Spring+Struts2+MyBatis这样的框架了,可不能简称为SSM。因为SSM是Spring+SpringMVC+Mybatis的简称。SSH是Spring+Struts2+Hibernate,不过现在SSH用的人也不多了。这里笔者把Sping+Struts2+Mybatis放在一起就是纯粹的实现一下功能。主要讨论的还是Struts2和Spring。
如果不使用Spring框架,Struts2框架内部还是有机制可以利用反射创建对象,之所以要把Spring+Struts2结合起来,除了体现和依赖Spring中IOC(控制反转),还有就是他的AOP(面向切面编程),这两点都是非常强大的。也就是说,使用了Spring+Struts2之后,之前由Struts2创建对象的功能交给了Spring容器来实现了。而Struts2替换了Spring中的mvc部分。因此在Spring容器进行配置的时候,就不应该再进行配置Spring-webmvc部分了。
2,实现部署Spring+Struts2+Mybatis框架
看一下项目的结构:
首先就是导入jar包,struts2的jar包,Spring容器的jar包,Mybatis的jar包,以及struts2和Spring的整合包,Spring和Mybatis的整合包,这里笔者使用的数据库是mysql,因此还有MySQL的驱动包和连接池包。
web.xml文件
<?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" version="3.0"> <display-name>springStruts2Mybatis</display-name> <welcome-file-list> <welcome-file>index.html</welcome-file> </welcome-file-list> <filter> <filter-name>struts</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts</filter-name> <url-pattern>*</url-pattern> </filter-mapping> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml</param-value> </context-param> <listener> <listener-class> org.springframework.web.context.ContextLoaderListener </listener-class> </listener> </web-app>
其中下面这段代码:
<filter> <filter-name>struts</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts</filter-name> <url-pattern>*</url-pattern> </filter-mapping>
就是将Struts2框架配置到web容器中。然后下面这一段:
<context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml</param-value> </context-param> <listener> <listener-class> org.springframework.web.context.ContextLoaderListener </listener-class> </listener>
就是把Spring配置到容器中去。这样的话,当随着容器启动,struts2和spring的xml文档对象就创建好了。
struts.xml文件
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN" "http://struts.apache.org/dtds/struts-2.1.7.dtd"> <struts> <!--Struts默认只会通过.action和无后缀的请求,我们可以通过指定extension来使得Struts只通过.do的URL的请求。--> <constant name="struts.action.extension" value="do"/> <!-- 必须继承struts-default,才能使用Result组件 --> <package name="user" extends="struts-default"> <!--这里的class就是Spring容器中的bean的id--> <action name="userlogin" class="userAction"> <!-- name对应action返回值;type指定Result 类型 --> <result name="result" type="dispatcher">loginResult.jsp</result> </action> </package> </struts>
其中action节点的class值应该是spring容器中bean对象的id值。
applicationContext.xml文件
<?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:jdbc="http://www.springframework.org/schema/jdbc" xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:util="http://www.springframework.org/schema/util" xmlns:jpa="http://www.springframework.org/schema/data/jpa" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.1.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.1.xsd http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.1.xsd"> <!-- 开启注解扫描 --> <context:component-scan base-package="cn"></context:component-scan> <bean id="config" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="locations"> <list> <value>classpath:db-config.properties</value> </list> </property> </bean> <!-- 获取数据源 --> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"> <property name="url"> <value>${db.url}</value> </property> <property name="username"> <value>${db.username}</value> </property> <property name="password"> <value>${db.password}</value> </property> <property name="driverClassName"> <value>${db.dirverClass}</value> </property> </bean> <!--把服务层配置到容器中--> <bean id="ssf" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="configLocation" value="classpath:sqlmap-config.xml"></property> <property name="dataSource" ref="dataSource"></property> </bean> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="sqlSessionFactoryBeanName" value="ssf"></property> <property name="basePackage" value="cn.shop.dao"></property> </bean> </beans>
在个是文档是spring的,由于struts2充当了spring webmvc的角色,因此在本文档不应该配置任何有关mvc的部分。
db-config.properties文件
db.dirverClass=com.mysql.cj.jdbc.Driver db.url=jdbc:mysql:///test?characterEncoding=utf8&useSSL=true&serverTimezone=GMT db.password=517839 db.username=root
UserAction.java文件
package cn.shop.action; import javax.annotation.Resource; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import cn.shop.bean.UserInfo; import cn.shop.dao.UserMapper; import cn.shop.service.UserService; @Controller public class UserAction { @Resource private UserService userService; private String username;//接受参数 private String password;//接受参数 private String message;//传出参数 public String getMessage() { return message; } public void setMessage(String message) { this.message = message; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String execute(){ UserInfo userinfo=userService.userlogin(username, password); if(userinfo!=null){ message="登录成功"; }else{ message="登录失败"; } return "result"; } }
UserInfo.java文件
package cn.shop.bean; public class UserInfo { private int userid; private String username; private String password; public UserInfo() { super(); } public UserInfo(int userid, String username, String password) { super(); this.userid = userid; this.username = username; this.password = password; } public int getUserid() { return userid; } public void setUserid(int userid) { this.userid = userid; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } }
UserMapper.java文件
package cn.shop.dao; import org.apache.ibatis.annotations.Param; import org.springframework.stereotype.Repository; import cn.shop.bean.UserInfo; public interface UserMapper { UserInfo findUserByNameAndPass(@Param("name")String name,@Param("upass")String pass); }
UserService.java文件
package cn.shop.service; import javax.annotation.Resource; import org.springframework.stereotype.Service; import cn.shop.bean.UserInfo; import cn.shop.dao.UserMapper; @Service public class UserService { @Resource private UserMapper userMapper; public UserInfo userlogin(String username,String password){ return userMapper.findUserByNameAndPass(username, password); } }
UserMapper.xml文件
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN" "http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd"> <mapper namespace="cn.shop.dao.UserMapper"> <!-- 查询操作--> <select id="findUserByNameAndPass" resultType="cn.shop.bean.UserInfo"> select * from userinfo where username =#{name} and password=#{upass}; </select> </mapper>
sqlmap-config.xml文件
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//ibatis.apache.org//DTD Config 3.0//EN" "http://ibatis.apache.org/dtd/ibatis-3-config.dtd"> <configuration> <!-- 加载SQL定义文件 --> <mappers> <mapper resource="cn/shop/sql/UserMapper.xml" /> </mappers> </configuration>
login.jsp文件
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>用户登录</title> </head> <body> <form action="userlogin.do" method="POST" > 用户名:<input type="text" name="username"/> <br/> 密码:<input type="password" name="password"/> <br/> <input type="submit" value="提交" /> </form> </body> </html>
loginResult.jsp文件
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>用户登录</title> </head> <body> 登录结果是:${message } </body> </html>
然后这里笔者说一说整体的配置思路,就是先配送Spring+Struts2部分,然后再配置Spring+Mybatis部分,最后将三者联系起来就可以了。在配置的时候需要测试的,特别是在,mybatis和spring容器部分,因此这些部分的内容应该在配置过程中进行测试。
当Mabatis单个部分配置完成后,我们可以通过如下的代码检查是否有Bug.
SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder(); Reader reader = Resources.getResourceAsReader("sqlmap-config.xml"); SqlSessionFactory factory = builder.build(reader); SqlSession session = factory.openSession();
UserMapper usermapper= session.getMapper(UserMapper.class); UserInfo userinfos=usermapper.findUserByNameAndPass("jame","123456"); System.out.println(userinfos.getPassword());
这里笔者就用上面的代码举例了。还有,就是关于Mybatis部分,可以参见Mybatis如何配置
如果没有问题了,我们就把和Spring容器整合。对spring进行检查,这里笔者拷贝一段测试上面Spring容器的部分代码
ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml"); SqlSessionFactory factory = ac.getBean("ssf",SqlSessionFactory.class); SqlSession session = factory.openSession(); UserMapper usermapper= session.getMapper(UserMapper.class); UserInfo userinfos=usermapper.findUserByNameAndPass("jame","123456"); System.out.println(userinfos.getPassword());
看完了测试的代码,在测试XML过程中都是根据XML文件创建文档对象,然后通过文档对象调用其中的方法,只不过spring和mybatis的语法不同而已。
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