maven高级21_基于maven构建SSM工程3
一、需求描述
本案例基于maven构建 SSM（Spring+SpringMVC+Mybatis）工程，通过maven坐标进行依赖管理。最终实现根据 id 查询商品信息的功能。
二、实现步骤分析
1、数据库环境搭建
①创建数据库ssmtest
②创建商品表item
2、maven项目构建
①创建maven web项目
②配置pom.xml文件
③实现spring+mybatis整合
-
- 创建POJO类
- 持久层DAO接口编写
- Mapper映射文件编写
- 业务层Service编写
- spring配置文件applicationContext-dao.xml编写
- spring配置文件applicationContext-service.xml编写
④加入springmvc相关配置
-
- 表现层Controller编写
- springmvc.xml文件编写
- jsp页面编写
- 配置web.xml文件
三、数据库环境搭建
①创建数据库ssmtest
②创建商品表item
DROP TABLE IF EXISTS `item`;
CREATE TABLE `item` (
`id` int(11) NOT NULL auto_increment,
`name` varchar(255) default NULL,
`price` float default NULL,
`createtime` datetime default NULL,
`detail` varchar(255) default NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
INSERT INTO `item` VALUES ('1','电视机','4500','2019-01-10 11:30:18','电视机');
四、构建maven工程
①创建maven web项目
不加创建工程后会从maven中央仓库下载插件时间久，加了这个参数表示使用本地仓库的插件，加快项目创建速度。
②配置pom.xml文件
去掉原build标签部分，maven编译版本由1.7改成1.8
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.itheima</groupId> <artifactId>ssmweb</artifactId> <version>1.0-SNAPSHOT</version> <packaging>war</packaging> <name>ssmweb Maven Webapp</name> <!-- FIXME change it to the project's website --> <url>http://www.example.com</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <maven.compiler.source>1.8</maven.compiler.source> <maven.compiler.target>1.8</maven.compiler.target> <spring.version>5.0.5.RELEASE</spring.version> <springmvc.version>5.0.5.RELEASE</springmvc.version> <mybatis.version>3.4.5</mybatis.version> </properties> <!--锁定jar版本--> <dependencyManagement> <dependencies> <!-- Mybatis --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>${mybatis.version}</version> </dependency> <!-- springMVC --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${springmvc.version}</version> </dependency> <!-- spring --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</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-expression</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aspects</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>${spring.version}</version> </dependency> </dependencies> </dependencyManagement> <dependencies> <!-- Mybatis和mybatis与spring的整合 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.3.1</version> </dependency> <!-- MySql驱动 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.32</version> </dependency> <!-- druid数据库连接池 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.0.9</version> </dependency> <!-- springMVC核心--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> </dependency> <!-- spring相关 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-expression</artifactId> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aspects</artifactId> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> </dependency> <!-- junit测试 --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.5</version> <scope>provided</scope> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>jsp-api</artifactId> <version>2.0</version> <scope>provided</scope> </dependency> <!-- jstl --> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.1</version> <configuration> <source>1.8</source> <target>1.8</target> <encoding>UTF-8</encoding> </configuration> </plugin> </plugins> </build> </project>
③实现spring+mybatis整合
web插件创建的maven项目的目录结构不全需要先补齐main目录下的java、resources目录
创建POJO类
public class Item {
private Integer id;
private String name;
private Float price;
private Date createtime;
private String detail;
//省略setter、getter、toString
}
持久层DAO接口编写
public interface ItemMapper {
public Item findById(int id);
}
Mapper映射文件编写ItemMapper.xml
<?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.itheima.ssm.dao.ItemMapper">
<select id="findById" parameterType="int" resultType="item">
select * from item where id=#{id}</select>
</mapper>
业务层Service编写
package com.itheima.ssm.service;
import com.itheima.ssm.pojo.Item;
public interface ItemService {
public Items findById(int id);
}
service实现类
@Service
@Transactional
public class ItemServiceImpl implements ItemService {
@Autowired
private ItemMapper itemMapper;
public Item findById(int id) {
return itemMapper.findById(id);
}
}
spring配置文件applicationContext-dao.xml编写
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
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-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util-4.0.xsd">
<!-- 数据库连接池 --> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"> <property name="driverClassName" value="com.mysql.jdbc.Driver"/> <property name="url" value="jdbc:mysql://localhost:3306/ssmtest"/> <property name="username" value="root"/> <property name="password" value="root"/>
</bean>
<!-- mapper配置 -->
<!-- 让spring管理sqlsessionfactory 使用mybatis和spring整合包中的 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/> <!--为指定包下的所有实体类创建别名--> <property name="typeAliasesPackage" value="com.itheima.ssm.pojo"/>
</bean>
<!-- mapper扫描器 ：用来产生代理对象--> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.itheima.ssm.dao"></property> </bean> </beans>
spring配置文件applicationContext-service.xml编写
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" 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/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd"> <!--组建扫描 扫描service--> <context:component-scan base-package="com.itheima.ssm.service"/> <!--事务管理器--> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"/> </bean> <!--事务注解驱动--> <tx:annotation-driven transaction-manager="transactionManager"/> </beans>
④加入springmvc相关配置
表现层Controller编写
@Controller
@RequestMapping("/item")
public class ItemController {
@Autowired
private ItemService itemService;
@RequestMapping("/showItem/{id}")
public String showItem(@PathVariable("id") int id, Model model){
Item item = itemService.findById(id);
model.addAttribute("item",item);
return "item";
}
}
springmvc.xml文件编写
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
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-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd">
<!-- 配置扫描器，扫描controller -->
<context:component-scan base-package="com.itheima.ssm.controller"/>
<!-- 配置视图解析器的前缀和后缀 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix“ value="/WEB-INF/jsp/"></property> <property name="suffix" value=".jsp"></property> </bean> </beans>
jsp页面编写WEB-INF/jsp/item.jsp
<%@ page contentType="text/html;charset=UTF-8" isELIgnored="false" language="java" %> <html> <head> <title>Title</title> </head> <body> ${item} </body> </html>
配置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> <!--指定spring配置文件位置--> <context-param> <param-name>contextConfigLocation</param-name>
<!-- 如果配置文件在jar包里，则需要写classpath*来加载配置文件 --> <param-value>classpath:applicationContext*.xml</param-value>
<!-- <param-value>classpath*:applicationContext*.xml</param-value> --> </context-param> <!--配置spring框架启动时使用的监听器--> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!--配置springmvc的前端控制器--> <servlet> <servlet-name>dispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <!--指定springmvc配置文件位置--> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springmvc.xml</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>dispatcherServlet</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> </web-app>
配置并且启动tomcat
浏览器访问http://localhost:8080/item/showItem/1.do，查看浏览器展示
