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Java学习之SSM框架整合
0x00 前言
前面的学习的Spring、Spring MVC 和Mybatis框架基本已经学习完了,但是要使用起来,我们需要把这三大框架给整合起来一起使用。
0x01 Spring 整合Spring MVC
首先要先把Spring 和Spring MVC 给整合起来,能正常运行后,再去整合Mybatis。
这里来配置一下坐标,把要使用的jar包都配置一下。
pom.xml:
<properties>
<spring.version>5.0.2.RELEASE</spring.version>
<slf4j.version>1.6.6</slf4j.version>
<log4j.version>1.2.12</log4j.version>
<mysql.version>5.1.6</mysql.version>
<mybatis.version>3.4.5</mybatis.version>
</properties>
<dependencies>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.6.8</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version><scope>compile</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- log start -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${slf4j.version}</version>
</dependency>
<!-- log end -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>${mybatis.version}</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.0</version>
</dependency>
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
</dependencies>
编写一个实体类:
import java.io.Serializable;
public class Account implements Serializable {
private int id;
private String name;
public Account() {
}
public Account(int id, String name, double money) {
this.id = id;
this.name = name;
this.money = money;
}
private double money;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getMoney() {
return money;
}
public void setMoney(double money) {
this.money = money;
}
}
dao 接口:
public interface Accountdao {
List<Account> findAll();
void saveAccount();
}
web.xml文件:
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<display-name>Archetype Created Web Application</display-name>
<servlet>
<!-- 配置前端控制器-->
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<!-- 配置加载springmvc.xml文件-->
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<!-- 配置控制器拦截路径-->
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- 配置编码-->
<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>
</filter>
<filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- 使用监听器加载spring.xml文件-->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationcontenxt.xml</param-value>
</context-param>
</web-app>
applicationcontent.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:aop="http://www.springframework.org/schema/aop"
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.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 开启注解扫描-->
<context:component-scan base-package="com.test">
<!-- 配置不扫描Controller注解-->
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
</beans>
这里需要配置不扫描Controller注解,Controller要交给Spring mvc来操作。
spring mvc.xml文件:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 扫描controller的注解,别的不扫描 -->
<context:component-scan base-package="com.test">
<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
<!-- 配置视图解析器 -->
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!-- JSP文件所在的目录 -->
<property name="prefix" value="/WEB-INF/pages/" />
<!-- 文件的后缀名 -->
<property name="suffix" value=".jsp" />
</bean>
<!-- 设置静态资源不过滤 -->
<mvc:resources location="/css/" mapping="/css/**" />
<mvc:resources location="/images/" mapping="/images/**" />
<mvc:resources location="/js/" mapping="/js/**" />
<!-- 开启对SpringMVC注解的支持 -->
<mvc:annotation-driven />
</beans>
这些配置完后,就可以来写其他的类了。
service接口:
public interface Accountservice {
List<Account> findAll();
void saveAccount(Account account);
}
service实现类:
@Service("accountserivce")
public class AccountserivceImpl implements Accountservice{
@Override
public List<Account> findAll() {
System.out.println("业务层,查询所有账户信息");
return null;
}
@Override
public void saveAccount(Account account) {
System.out.println("业务层,保存用户信息");
}
}
最后一步,编写controller类:
@Service("accountserivce")
//当Spring要创建AccountServiceImpl的的实例时,bean的名字必须叫做accountserivce
public class AccountserivceImpl implements Accountservice{
@Override
public List<Account> findAll() {
System.out.println("业务层,查询所有账户信息");
return null;
}
@Override
public void saveAccount(Account account) {
System.out.println("业务层,保存用户信息");
}
}
将变量注入到容器后,就可以直接来调用他的方法了。
能正常执行调用serviceimpl的方法就把这两大框架给整合完成了。
0x02 整合Mybatis
我们需要在spring配置文件里面把sqlsession工厂类给配置进去。
applicationcontenxt.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:aop="http://www.springframework.org/schema/aop"
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.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 开启注解扫描-->
<context:component-scan base-package="com.test">
<!-- 配置不扫描控制器-->
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
<!--配置连接池对象 -->
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql:///ssm" />
<property name="username" value="root" />
<property name="password" value="root" />
</bean>
<!-- 配置SqlSession的工厂 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
</bean>
<!-- 配置扫描dao的包 -->
<bean id="mapperScanner" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.test.dao"/>
</bean>
</beans>
配置完成后,就可以来修改dao接口了。
dao接口:
@Repository
//使用注解将该接口注入到spring
public interface Accountdao {
@Select("select * from account")
List<Account> findAll();
@Insert("insert into account (name,money)values (#{name},#{money})")
void saveAccount(Account account);
}
serviceimpl类:
@Service("accountserivce")
//当Spring要创建AccountServiceImpl的的实例时,bean的名字必须叫做accountserivce
public class AccountserivceImpl implements Accountservice{
@Autowired
// 将该变量注入到spring中
private Accountdao accountdao;
@Override
public List<Account> findAll() {
System.out.println("业务层,查询所有账户信息");
return accountdao.findAll();
}
@Override
public void saveAccount(Account account) {
System.out.println("业务层,保存用户信息");
accountdao.saveAccount(account);
}
}
controller:
@Controller
@RequestMapping("/account")
public class AccountController {
@Autowired
// 使用注解将变量注入到spring容器中
private Accountservice accountservice;
@RequestMapping("/findAll")
public String findAll(Model model){
System.out.println("表现层执行了");
List<Account> userlist = accountservice.findAll();
model.addAttribute("userlist",userlist);
return "list";
}
}
把查询内容封装到model对象里面,然后使用addAttribute方法共享到域中,在jsp页面里面写入el和jspl表达式我们就可以在页面中看到查询的内容了。
配置事务管理
在spring配置里面配置事务管理
applicationcontenxt.xml:
<!-- 配置事务管理器 -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 配置事务的通知 -->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="*" propagation="REQUIRED" read-only="false"/>
<tx:method name="find*" propagation="SUPPORTS" read-only="true"/>
</tx:attributes>
</tx:advice>
<!-- 配置 aop -->
<aop:config>
<!-- 配置切入点表达式 -->
<aop:pointcut expression="execution(* com.test.serivce.*.*(..))"
id="pt1"/>
<!-- 建立通知和切入点表达式的关系 -->
<aop:advisor advice-ref="txAdvice" pointcut-ref="pt1"/>
</aop:config>
AccountController类加多一个保存的方法,让jsp页面的表单提交到该方法后,进行获取,然后调用保存的方法进行存储数据。
@RequestMapping("/save")
public String save(Account account){
accountservice.saveAccount(account);
return "list";
}
jsp页面:
<form action="${pageContext.request.contextPath}/account/save" method="post">
id: <input name="id" type="text">
姓名: <input name="name" type="text">
钱: <input name="money" type="text">
<input type="submit" value="提交">
0x03 结尾
ssm的框架整合完成,这里写了一个小案例来做了整合的演示。在调试的时候频繁出问题,大部分的原因还是因为xml配置的问题。
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