基于maven构建一个SSM工程案例

基于maven构建一个简单SSM工程案例

前段时间看某马视频学习了maven的使用以及Spring+SpringMVC+Mybatis框架的基本使用，发现自己根本没有清楚掌握其中的业务逻辑，只是跟着视频一点一点的抄着代码，故写下此文巩固一下所学。

首先，当然是用万能的idea创建一个maven工程,选上webapp的项目。

随便创建一个含有几个属性的表和一个元组，接下来就是配置pom.xml文件了。

1.配置pom.xml文件

<?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>pers.fjl</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>

  <!-- 统一管理jar包版本 -->
  <properties>
    <spring.version>5.0.2.RELEASE</spring.version>
    <slf4j.version>1.6.6</slf4j.version>
    <log4j.version>1.2.12</log4j.version>
    <shiro.version>1.2.3</shiro.version>
    <mysql.version>5.1.6</mysql.version>
    <mybatis.version>3.4.5</mybatis.version>
    <spring.security.version>5.0.1.RELEASE</spring.security.version>
  </properties>

  <!-- 锁定jar包版本 -->
  <dependencyManagement>
    <dependencies>
      <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-tx</artifactId>
        <version>${
    
    spring.version}</version>
      </dependency>
      <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-test</artifactId>
        <version>${
    
    spring.version}</version>
      </dependency>
      <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>${
    
    mybatis.version}</version>
      </dependency>
    </dependencies>
  </dependencyManagement>

  <!-- 项目依赖jar包 -->
  <dependencies>
    <!-- spring -->
    <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-context-support</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-orm</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-core</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-webmvc</artifactId>
      <version>${
    
    spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>${
    
    spring.version}</version>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>${
    
    mysql.version}</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</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>
    <dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>5.1.2</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.security</groupId>
      <artifactId>spring-security-web</artifactId>
      <version>${
    
    spring.security.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.security</groupId>
      <artifactId>spring-security-config</artifactId>
      <version>${
    
    spring.security.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.security</groupId>
      <artifactId>spring-security-core</artifactId>
      <version>${
    
    spring.security.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.security</groupId>
      <artifactId>spring-security-taglibs</artifactId>
      <version>${
    
    spring.security.version}</version>
    </dependency>
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.0.9</version>
    </dependency>
  </dependencies>
  <!-- 添加tomcat7插件 -->
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.tomcat.maven</groupId>
        <artifactId>tomcat7-maven-plugin</artifactId>
        <version>2.2</version>
      </plugin>
    </plugins>
  </build>


</project>

pom文件中我导了比较多的依赖便于后面其他项目的运行，各位按需导入即可

2.实现spring+mybatis的整合

首先创建实体类Item来封装从数据库中获取的数据，接着用持久层DAO创建方法的实现接口，spring配置文件分为两个更加清晰，mapper文件负责映射。第二节主要是配置后端Service业务层以及DAO持久层。

2.1 创建POJO（实体类）

package pers.fjl.ssm.pojo;

import java.util.Date;

public class Item {
    
    
    private Integer id;
    private String name;
    private float price;
    private Date createtime;
    private String detail;

    @Override
    public String toString() {
    
    
        return "pojo{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", price=" + price +
                ", createtime=" + createtime +
                ", detail='" + detail + '\'' +
                '}';
    }

    public Integer getId() {
    
    
        return id;
    }

    public void setId(Integer id) {
    
    
        this.id = id;
    }

    public String getName() {
    
    
        return name;
    }

    public void setName(String name) {
    
    
        this.name = name;
    }

    public float getPrice() {
    
    
        return price;
    }

    public void setPrice(float price) {
    
    
        this.price = price;
    }

    public Date getCreatetime() {
    
    
        return createtime;
    }

    public void setCreatetime(Date createtime) {
    
    
        this.createtime = createtime;
    }

    public String getDetail() {
    
    
        return detail;
    }

    public void setDetail(String detail) {
    
    
        this.detail = detail;
    }
}

2.2 持久层DAO接口编写

DAO接口写上方法即可，

package pers.fjl.ssm.dao;

import pers.fjl.ssm.pojo.Item;

public interface ItemMapper {
    
    
    public Item findById(int id);
}

2.3 Mapper映射文件编写(ItemMapper.xml)

这里注意把命名空间设定为DAO的接口即可，其余都是比较简单的。

<?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="pers.fjl.ssm.dao.ItemMapper">
    <select id="findById" parameterType="int" resultType="Item">
        select * from items where id = #{
    
    id}
    </select>
</mapper>

2.4 业务层Service编写

接口的编写

package pers.fjl.ssm.service;

import pers.fjl.ssm.pojo.Item;

public interface ItemService {
    
    
    public Item findById(int id);
}

接口的实现类，需要注意的是，采用Spring注解方式配置的Service层，需要在applicationContext-service.xml中配置扫描组件以及事务管理器，这个在下文中有提到。

package pers.fjl.ssm.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import pers.fjl.ssm.dao.ItemMapper;
import pers.fjl.ssm.pojo.Item;
import pers.fjl.ssm.service.ItemService;

@Service
@Transactional
public class ItemServiceImpl implements ItemService {
    
    
    @Autowired
    private ItemMapper itemMapper;

    public Item findById(int id) {
    
    
        return itemMapper.findById(id);
    }
}

2.5 spring配置文件applicationContext-dao.xml

配置数据库连接的信息，扫描器，一起sqlSessionFactoryBean。

<?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:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       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
			    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
			    http://www.springframework.org/schema/mvc
			    http://www.springframework.org/schema/mvc/spring-mvc.xsd">

<!--    配置数据源信息-->
    <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/ssm"/>
        <property name="username" value="root"/>
        <property name="password" value=""/>
    </bean>

<!--    配置spring整合mybatis框架的SqlSessionFactoryBean-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
<!--        扫描pojo包，为实体类创建别名-->
        <property name="typeAliasesPackage" value="pers.fjl.ssm.pojo"/>
    </bean>

<!--    mapper扫描器，用于产生代理对象-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="pers.fjl.ssm.dao"/>
    </bean>

</beans>

2.6 spring配置文件applicationContext-service.xml

配置扫描组件扫描service层所在的包，以及事务管理器。

<?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:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       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
			    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
			    http://www.springframework.org/schema/mvc
			    http://www.springframework.org/schema/mvc/spring-mvc.xsd">

<!--    配置扫描器扫描service-->
    <context:component-scan base-package="pers.fjl.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>

3.加入springmvc相关配置

第三节主要配置web层和controller层，采用SpringMVC框架完成jsp页面与控制层的交互。

3.1 控制层Controller

控制层只需加上注解，再把Service从dao中封装好的Item对象添加到域中即可，由于已经配置好了前缀和后缀的视图解析器（3.2中配置），所以只需返回jsp页面的字符串即可。

package pers.fjl.ssm.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import pers.fjl.ssm.pojo.Item;
import pers.fjl.ssm.service.ItemService;

@Controller
@RequestMapping("/item")
public class ItemController {
    
    
    @Autowired
    private ItemService itemService;

    @RequestMapping("/showItem/{id}")   //练习从访问的url取出id
    public String findById(@PathVariable("id") int id, Model model){
    
    
        Item item = itemService.findById(id);
        model.addAttribute("item",item);
        return "item";
    }

}

3.2 springmvc.xml文件编写

<?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:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       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
			    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
			    http://www.springframework.org/schema/mvc
			    http://www.springframework.org/schema/mvc/spring-mvc.xsd">

<!--    配置扫描器,扫描Controller-->
    <context:component-scan base-package="pers.fjl.ssm.controller"/>

<!--    视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>

</beans>

3.3 jsp页面编写

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    ${
    
    item}
</body>
</html>

取出controller放在域中的对象item即可

3.4 配置web.xml

<!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>
    <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>

<!--  springmvc的前端控制器-->
  <servlet>
    <servlet-name>springmvc</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>springmvc</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>

</web-app>

最后一步，只需在web.xml获取配置文件位置、配置前端控制器以及监听器便大功告成，接下来启动Tomcat部署项目并测试。