Java之SpringMVC-SSM整合
SSM整合
sql
CREATE DATABASE `ssmbuild`;
USE `ssmbuild`;
CREATE TABLE `books`(
`bookID` INT(10) NOT NULL AUTO_INCREMENT COMMENT '书id',
`bookName` VARCHAR(100) NOT NULL COMMENT '书名',
`bookCounts` INT(11) NOT NULL COMMENT '数量',
`detail` VARCHAR(200) NOT NULL COMMENT '描述',
KEY `bookID`(`bookID`)
)ENGINE=INNODB DEFAULT CHARSET=utf8;
INSERT INTO `books`(`bookID`,`bookName`,`bookCounts`,`detail`) VALUES
(1,'Java',1,'从入门到放弃'),
(2,'MySQL',10,'从删库到跑路'),
(3,'Linux',5,'从进门到进牢');
pom.xml
<dependencies>
<!--Junit-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<!--数据库驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
<!-- 数据库连接池 -->
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.2</version>
</dependency>
<!--Servlet - JSP -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!--Mybatis-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.2</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.2</version>
</dependency>
<!--Spring-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.1.9.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.1.9.RELEASE</version>
</dependency>
</dependencies>
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
</resources>
</build>
spring-dao.xml ==> Spring整合Dao
<?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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
<!-- 加载连接数据库配置文件 -->
<context:property-placeholder location="classpath:database.properties"/>
<!-- 配置c3p0连接池-->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<!-- 数据库连接部分，从绑定的数据库配置文件获取数据库连接信息-->
<property name="driverClass" value="${jdbc.driver}"/>
<property name="jdbcUrl" value="${jdbc.url}"/>
<property name="user" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
<!-- c3p0连接池的私有属性 -->
<property name="maxPoolSize" value="30"/>
<property name="minPoolSize" value="10"/>
<!-- 关闭连接后不自动commit -->
<property name="autoCommitOnClose" value="false"/>
<!-- 获取连接超时时间 -->
<property name="checkoutTimeout" value="10000"/>
<!-- 当获取连接失败重试次数 -->
<property name="acquireRetryAttempts" value="2"/>
</bean>
<!-- sqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 绑定数据源-->
<property name="dataSource" ref="dataSource"/>
<!-- 绑定Mybatis配置文件-->
<property name="configLocation" value="classpath:mybatis-config.xml"/>
</bean>
<!-- 动态扫描dao包，动态实现dao接口注入到spring容器-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- 注入sqlSessionFactory-->
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
<!-- 要扫描的dao包-->
<property name="basePackage" value="com.zh1z3ven.dao"/>
</bean>
</beans>
database.properties，连接数据库所需静态资源文件
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=false&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=123456
mybatis-config.xml , mybatis配置文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!-- 设置别名 -->
<typeAliases>
<package name="com.zh1z3ven.pojo"/>
</typeAliases>
<!-- 注册Mapper.xml -->
<mappers>
<mapper resource="com/zh1z3ven/dao/BookMapper.xml"/>
</mappers>
</configuration>
spring-service.xml ==> spring整合service
<?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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
<!-- 扫描service包-->
<context:component-scan base-package="com.zh1z3ven.service"/>
<!-- 将service类注入到Spring 通过配置或注解实现-->
<bean id="BookServiceImpl" class="com.zh1z3ven.service.BookServiceImpl">
<property name="bookMapper" ref="bookMapper"/>
</bean>
<!-- 声明式事务配置-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!-- 拿到数据源-->
<property name="dataSource" ref="dataSource"/>
</bean>
</beans>
Spring-mvc.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
https://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!--注解驱动-->
<mvc:annotation-driven/>
<!-- 静态资源过滤-->
<mvc:default-servlet-handler/>
<!-- 扫描controller包-->
<context:component-scan base-package="com.zh1z3ven.controller"/>
<!-- 视图解析器-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
</beans>
applicationContext.xml, spring容器上下文配置文件，所有的配置最好都引入到这里
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
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">
<import resource="classpath:spring-dao.xml"/>
<import resource="classpath:spring-service.xml"/>
<import resource="classpath:spring-mvc.xml"/>
</beans>
Web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<!-- 配置SpringMVC中DispachFactory-->
<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:applicationContext.xml</param-value>
</init-param>
<!-- 启动时一起加载 -->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- 乱码过滤-->
<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>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- Session Config过期时间-->
<session-config>
<session-timeout>15</session-timeout>
</session-config>
</web-app>
整体项目结构大致如下，之后只需要丰富Dao中的接口，主要是添加CRUD功能即可，然后在Mapper.xml中编写SQL语句；在Service层中调用Dao层完成基础CRUD操作，且也可以配置一些其他操作，如事务处理等；之后在Controller层调用和处理Service逻辑并将需要的内容保存在Model上下文中供前端页面获取并渲染呈现给用户。
简单示例：
pojo
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Book {
private int bookID;
private String bookName;
private int bookCounts;
private String detail;
}
Dao层
BookMapper.java
public interface BookMapper {
//add
int addBook(Book book);
//delete 这里@Param("bookID")中的值与mybatis中sql语句的#{bookID}名称一致才可以获取到
int deleteBookById(@Param("bookID") int id);
//update
int updateBook(Book book);
//select by id
Book queryBookById(@Param("bookID") int id);
//select all
List<Book> queryAllBook();
}
BookMapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!--一个mapper对应一个接口-->
<mapper namespace="com.zh1z3ven.dao.BookMapper">
<insert id="addBook" parameterType="Book">
insert into ssmbuild.books (bookName, bookCounts, detail) values (#{bookName},#{bookCounts},#{detail});
</insert>
<delete id="deleteBookById" parameterType="int">
delete from ssmbuild.books where bookID=#{bookID}
</delete>
<update id="updateBook" parameterType="Book">
update ssmbuild.books
set bookName = #{bookName},bookCounts = #{bookCounts},detail = #{detail}
where bookID = #{bookID}
</update>
<select id="queryBookById" parameterType="int">
select * from ssmbuild.books where bookID = #{bookID}
</select>
<select id="queryAllBook" resultType="Book">
select * from ssmbuild.books
</select>
</mapper>
Service层
BookService.java
public interface BookService {
//add
int addBook(Book book);
//delete
int deleteBookById(int id);
//update
int updateBook(Book book);
//select by id
Book queryBookById(int id);
//select all
List<Book> queryAllBook();
}
BookServiceImpl.java
//dao和service就是mvc中的model层
public class BookServiceImpl implements BookService{
//Service层调Dao层
//调Dao，创建set，方便spring整合
private BookMapper bookMapper;
public void setBookMapper(BookMapper bookMapper) {
this.bookMapper = bookMapper;
}
//通过调用dao层示例对象去操作数据库，同时还可以在service层做一些其他的操作，如事务的操作
public int addBook(Book book) {
return bookMapper.addBook(book);
}
public int deleteBookById(int id) {
return bookMapper.deleteBookById(id);
}
public int updateBook(Book book) {
return bookMapper.updateBook(book);
}
public Book queryBookById(int id) {
return bookMapper.queryBookById(id);
}
public List<Book> queryAllBook() {
return bookMapper.queryAllBook();
}
}
Controller层
@Controller
@RequestMapping("/book")
public class BookController {
@Autowired
@Qualifier("BookServiceImpl")
private BookService bookService;
@RequestMapping("/allBooks")
public String allBooks(Model model){
List<Book> list = bookService.queryAllBook();
model.addAttribute("list", list);
return "allBook";
}
}
之后在/WEB-INF/jsp/allBook.jsp中使用${list}即可在spring上下文中获取到list这个属性值并渲染到前端页面。
结语：
SSM整合其实基本都是各种xml配置文件将三层架构串起来，多看几遍手动跟下配置其实就能捋清MVC的整体架构了。
PS：想起了之前在学校的日子，那会其实也蛮想学Java，包括我自己第一本关于编程的书就是Java的，但是又听在学的同学说很难，我也就觉得Java好难然后搁置了。其实这次跟着学下来感觉还不错，没想象中的那么难，Java的逻辑很清晰。道阻且长，行则将至。
所有内容仅限于维护网络安全学习参考
