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ssm整合案例(超級詳細)前言:一、項目環境搭建:二、分層編寫代碼:總結:

前言:

spring+springmvc+mybatis，稱為ssm。ssm可以說是後端程式員必備技能，應該也是目前用得最多的，是以無論如何都要掌握！下面一起來看整合案例。點

我

下載下傳源碼。

開發環境:

1、開發工具:eclipse 4.7.3

2、maven 3.5.2

3、jdk 1.9

4、tomcat 8.5

5、mysql 5.7.21

一、項目環境搭建:

1、建立項目:

打開eclipse，file --> new --> maven project --> maven archetype webapp，然後填寫好artifactId，點finish即可。若是建立maven項目失敗，請參考

eclipse建立maven項目失敗解決方法

2、建立項目目錄結構:

建立好項目以後，按照下圖建立項目結構:

ssm整合案例(超級詳細)前言:一、項目環境搭建:二、分層編寫代碼:總結:

圖檔發自簡書App

注意:項目剛建立出來可能隻有src/main/java，自己建立其他的時候是 new source folder，而不是package。

3、添加依賴:

接下來就是添加依賴，本案例需要如下依賴:

<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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.zhu</groupId>
    <artifactId>ssm</artifactId>
    <packaging>war</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>ssm Maven Webapp</name>
    <url>http://maven.apache.org</url>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>


        <!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>4.3.14.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>4.3.14.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.3.14.RELEASE</version>
        </dependency>


        <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.3.14.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-tx -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>4.3.14.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-web -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>4.3.14.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.3.14.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-test -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>4.3.14.RELEASE</version>
            <scope>test</scope>
        </dependency>

        <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>

        <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.8.7</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/commons-collections/commons-collections -->
        <dependency>
            <groupId>commons-collections</groupId>
            <artifactId>commons-collections</artifactId>
            <version>3.2</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.2</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.1</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.37</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/com.mchange/c3p0 -->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>


>>  </dependencies>
    <build>
        <finalName>ssm</finalName>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>3.6.1</version>
            </plugin>
        </plugins>
    </build>
</project>

4、完成各項配置:

添加好依賴之後，就來完成jdbc資料源、mybatis和spring 的配置:

jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql:///ssm?useUnicode=true&characterEncoding=utf8
jdbc.username=#
jdbc.password=#

mybatis-config.xml

<?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>
    <!-- 配置全局屬性 -->
    <settings>
        <!-- 使用jdbc的getGeneratedKeys擷取資料庫自增主鍵值 -->
        <setting name="useGeneratedKeys" value="true" />

        <!-- 使用列别名替換列名 -->
        <!-- <setting name="useColumnLabel" value="true"/> -->

        <!-- 開啟駝峰命名轉換(userId === user_id) -->
        <setting name="mapUnderscoreToCamelCase" value="true" />
    </settings>

    <!-- 取别名，比如一個方法中傳回值類型是User，
             配置了這個在 parameterType屬性中就不用寫User的全類名，
            直接寫User即可，可以在這裡配置，也可以再spring配置檔案中配置 -->
    <!-- <typeAliases> <package name="com.zhu.smm.entity"/> </typeAliases> -->

</configuration>

src/main/resource/spring下有如下三個配置檔案，分别配置dao層，service層，controller層:

spring-dao.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:p="http://www.springframework.org/schema/p"  
    xmlns:aop="http://www.springframework.org/schema/aop"   
    xmlns:context="http://www.springframework.org/schema/context"  
    xmlns:jee="http://www.springframework.org/schema/jee"  
    xmlns:tx="http://www.springframework.org/schema/tx"  
    xsi:schemaLocation="    
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd  
        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/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd  
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">    
        
    <!-- 配置整合mybatis過程 -->
    
    <!-- 1、配置資料庫相關參數properties的屬性：${url} -->
    <context:property-placeholder location="classpath:jdbc.properties" />
    
    <!-- 2、配置資料庫連接配接池 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <!-- 配置連接配接池屬性 -->
        <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連接配接池的私有屬性 -->
        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>
        <!-- 關閉連接配接不自動commit -->
        <property name="autoCommitOnClose" value="false"/>
        <!-- 擷取連接配接逾時時間 -->
        <property name="checkoutTimeout" value="10000"/>
        <!-- 當擷取連接配接失敗時重試次數 -->
        <property name="acquireRetryAttempts" value="2"/>
    </bean>
    

    <!-- 3、配置mybatis的sqlSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <!-- 自動掃描mappers.xml檔案 -->
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
        <!-- 掃描mybatis-config檔案 -->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <!-- 掃描entity包，使用别名,或者在mybatis-config中配置,二選一 -->
        <property name="typeAliasesPackage" value="com.zhu.ssm.entity"></property>
    </bean>

    <!-- 4、DAO接口所在包名，Spring會自動查找其下的類 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.zhu.ssm.dao" />
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
    </bean>

</beans>

spring-service.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:p="http://www.springframework.org/schema/p"  
    xmlns:aop="http://www.springframework.org/schema/aop"   
    xmlns:context="http://www.springframework.org/schema/context"  
    xmlns:jee="http://www.springframework.org/schema/jee"  
    xmlns:tx="http://www.springframework.org/schema/tx"  
    xsi:schemaLocation="    
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd  
        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/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd  
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">    
        
    <!-- 掃描service包下所有使用注解的類型 -->
    <context:component-scan base-package="com.zhu.ssm.service"/>
    
    <!-- 事務管理 -->
    <bean id="transactionManager"
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>
    
    <!-- 開啟聲明式事物 -->
    <tx:annotation-driven transaction-manager="transactionManager"/>
    
</beans>

spring-web.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:p="http://www.springframework.org/schema/p"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
    xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="    
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd  
        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/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd  
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">
    <!-- 配置springmvc -->
    <!-- 1、開啟springMvc注解模式 -->
    <mvc:annotation-driven />
    <context:component-scan base-package="com.zhu.ssm.controller"/>

</beans>

注意:spring-web.xml中還可以配置視圖解析器、檔案上傳器、靜态資源的處理等，因為本案例未涉及這些内容，是以沒有配置。

5、對web.xml進行配置

需要在web.xml中進行如下配置，讓web容器能夠加載到spring的配置檔案:

<!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>
        <servlet-name>spring-dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring/spring-.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>spring-dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

至此，就完成了環境的搭建了，接下來就可以進行代碼的編寫了！

二、分層編寫代碼:

1、entity層:

User.java

public class User {
    private Integer userId;
    private String userName;
    private Integer age;
    private Card card;//一個人一張身份證,1對1
    private List<MobilePhone> mobilePhone;//土豪,多個手機,1對多
}

Card.java

public class Card {
    private Integer cardId;
    private String cardNum;//身份證号
    private String address;//位址
}

MobilePhone.java

public class MobilePhone {
    private Integer mobilePhoneId;
    private String brand;//品牌
    private double price;//價格
    private User user;//主人
}

注意:以上實體類均省略了set和get方法。

2、資料庫設計:

借助資料庫用戶端工具navicat進行資料庫以及表的建立。

ssm整合案例(超級詳細)前言:一、項目環境搭建:二、分層編寫代碼:總結:

tb_mobile_phone中以user_id作為外鍵關聯tu_user，tb_user中以card_id作為外鍵關聯tb_card。

3、dao層:

UserDao.java

/**
     * 帶條件分頁查詢：
     *     可輸入的條件：名字(模糊)，cardId，age,
     * @param userCondition 把條件封裝成一個user對象
     * @param rowIndex 表示從第幾行開始取資料
     * @param pageSize 表示要傳回多少行資料
     * @return 傳回user清單
     */
    List<User> queryUserList(@Param("userCondition") User userCondition, @Param("rowIndex") int rowIndex,
            @Param("pageSize") int pageSize);

UserDao.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.zhu.ssm.dao.UserDao">

    <resultMap type="User" id="userMap">
          <id property="userId" column="user_id"/>
          <result property="userName" column="user_name"/>
          <result property="age" column="age"/>
          <association property="card" column="card_id" javaType="Card">
            <id property="cardId" column="card_id"/>
            <result property="cardNum" column="card_num"/>
            <result property="address" column="address"/>
          </association>
          <collection property="mobilePhone" column="user_id" ofType="MobilePhone">
            <id column="mobile_phone_id" property="mobilePhoneId" />
            <result column="brand" property="brand" />
            <result column="price" property="price" />
          </collection>
    </resultMap>
    
    <!-- 帶條件分頁查詢 -->
    <select id="queryUserList" resultMap="userMap">
        SELECT
        u.user_name,u.age,u.card_id,c.card_num,c.address,m.brand,m.price
        FROM
        tb_user u,tb_card c,tb_mobile_phone m
        <where>
            <if
                test="userCondition.card != null
                     and 
                    userCondition.card.cardId != null">
                and u.card_id =
                #{userCondition.card.cardId}
            </if>

            <if test="userCondition.userName != null">
                and u.user_name like '%${userCondition.userName}%'
            </if>
            <if test="userCondition.age != null">
                and u.age = #{userCondition.age}
            </if>
            AND
            u.card_id = c.card_id
            AND
            u.user_id = m.user_id
        </where>
        LIMIT #{rowIndex},#{pageSize}
    </select>
    
</mapper>

dao層的帶條件分頁查詢用到了mybatis的動态sql，對動态sql不熟悉的請參考:

mybatis筆記整理

養成良好習慣，寫完dao應該做個Junit測試:

ssm整合案例(超級詳細)前言:一、項目環境搭建:二、分層編寫代碼:總結:

BaseTest.java

/**
 * 初始化spring各項配置的
 * @author zhu
 *
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration({"classpath:spring/spring-dao.xml","classpath:spring/spring-service.xml"})
public class BaseTest {
    

}

注意:BaseTest.java是用來加載spring配置檔案的。

UserDaoTest.java

public class UserDaoTest extends BaseTest {
    @Autowired
    private UserDao userDao;
    
    
    @Test
    public void testQueryUserList() {
        User userCondition = new User();
        /*Card c = new Card();
        c.setCardId(2);
        userCondition.setCard(c);*/
        //userCondition.setAge(22);
        userCondition.setUserName("菲");
        List<User> ul = userDao.queryUserList(userCondition, 1, 99);
        for(User user : ul) {
            System.out.println(user.getUserName());
            /*List<MobilePhone> list = new ArrayList<>();
            list = user.getMobilePhone();
            for(MobilePhone mp : list) {
                System.out.println(mp.getBrand());
            }*/
        }
    }
    
}

userCondition設定了userName一個"菲"字，就是模糊查詢名字中帶"菲"字的使用者。

先看資料庫表中的資料:

ssm整合案例(超級詳細)前言:一、項目環境搭建:二、分層編寫代碼:總結:

資料表中名字帶"菲"字的使用者隻有"劉亦菲"，正常運作的話應該輸出"劉亦菲"。

再看運作結果:

ssm整合案例(超級詳細)前言:一、項目環境搭建:二、分層編寫代碼:總結:

在控制台輸出了"劉亦菲"，符合預期，測試通過。

4、service層:

UserService.java

public interface UserService {
    
    
    /**
     * 帶條件分頁查詢：
     *     可輸入的條件：名字(模糊)，cardId，age,
     * @param userCondition 把條件封裝成一個user對象
     * @param rowIndex 表示從第幾行開始取資料
     * @param pageSize 表示要傳回多少行資料
     * @return 傳回user清單
     /
    List<User> queryUserList(@Param("userCondition") User userCondition, @Param("rowIndex") int rowIndex,
            @Param("pageSize") int pageSize);
    
    
}

UserServiceImpl.java

@Service
public class UserServiceImpl implements UserService {
    
    @Autowired
    private UserDao userDao;

    
    @Override
    public List<User> queryUserList(User userCondition, int rowIndex, int pageSize) {
        // TODO Auto-generated method stub
        return userDao.queryUserList(userCondition, rowIndex, pageSize);
    }

    
}

由于service層隻是簡單的調用了dao層，這裡不再做Junit測試。

5、controller層:

UserController.java

@Controller
@RequestMapping("/user")
public class UserController {
    @Autowired
    private UserService userService;

    @RequestMapping(value = "/listusers", method = RequestMethod.GET)
    @ResponseBody
    public Map<String, Object> listUsers() {
        Map<String, Object> modelMap = new HashMap<>();
        User userCondition = new User();
        List<User> userList = userService.queryUserList(userCondition, 1, 99);
        modelMap.put("userList", userList);
        return modelMap;
    }

}

至此，已完成所有代碼。接下來，在浏覽器輸入:

localhost:8080/ssm/user/listusers

在頁面就可以看到通路結果了:

ssm整合案例(超級詳細)前言:一、項目環境搭建:二、分層編寫代碼:總結:

注意:

圖檔中有幾個值為null，是因為查詢UserDao.xml中寫查詢語句時并沒有查這幾個字段，自己加上就行了。

總結:

常見問題:

1、做測試的時候一定要在BaseTest中加載spring 配置檔案，其他test在繼承BaseTest。

2、一定不要忘記web.xml中的配置，且路徑一定要寫對，否則web容器加載不到spring 配置檔案，通路controller時會報404錯誤。

3、由于tb_user中的card_id作為外鍵關聯了tb_card，是以為user設定card時，cardId一定得是tb_card中存在的，否則會報錯，user_id也是tb_mobile_phone的外鍵，同樣的道理。

以上内容屬于個人筆記整理，如果錯誤，歡迎大家批評指正!

java 資料庫連接配接 資料庫 Maven spring java資料spring spring Java連接配接 java資料連接配接 spring連接配接java 資料java jdbc
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