Spring+Spring MVC+Mybatis 框架整合開發（半註解半配置文件）

時間 2019-12-05

標籤 spring+spring spring mvc+mybatis mvc mybatis 框架整合開發註解配置文件欄目 Spring 简体版

原文原文鏈接

項目結構：

（代碼裏面都有註釋）css

1、在pom文件中依賴jar包

由於我這裏分了模塊，因此有父子級的共兩個pom文件java

父級：mysql

<?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>edu.nf</groupId>
    <artifactId>conformity</artifactId>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>ch01</module>
        <module>ch02</module>
        <module>ch03</module>
        <module>ch04</module>
        <module>ch05</module>
    </modules>
    <packaging>pom</packaging>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion>
        <!-- 版本管理 -->
        <spring.version>5.1.1.RELEASE</spring.version>
        <junit.version>4.12</junit.version>
        <druid.version>1.1.10</druid.version>
        <mysql.version>5.1.47</mysql.version>
        <mybatis.version>3.4.6</mybatis.version>
        <mybatis.spring.version>1.3.2</mybatis.spring.version>
        <pagehelper.version>5.1.2</pagehelper.version>
        <aspect.version>1.9.1</aspect.version>
        <servlet.version>4.0.1</servlet.version>
        <jackson.version>2.9.6</jackson.version>
        <slf4j.version>1.7.25</slf4j.version>
    </properties>

    <!-- 依賴管理,子模塊按需依賴 -->
    <dependencyManagement>
        <dependencies>
            <!-- javax.servlet-api -->
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>javax.servlet-api</artifactId>
                <version>${servlet.version}</version>
                <scope>provided</scope>
            </dependency>
            <!-- spring-web -->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-web</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <!-- spring-webmvc -->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <!-- jackson-databind -->
            <dependency>
                <groupId>com.fasterxml.jackson.core</groupId>
                <artifactId>jackson-databind</artifactId>
                <version>${jackson.version}</version>
            </dependency>
            <!-- spring-jdbc -->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-jdbc</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <!-- spring-tx -->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-tx</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <!-- mybatis-->
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis</artifactId>
                <version>${mybatis.version}</version>
            </dependency>
            <!-- mybatis整合spring插件 -->
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis-spring</artifactId>
                <version>${mybatis.spring.version}</version>
            </dependency>
            <!-- pagehelper分頁插件-->
            <dependency>
                <groupId>com.github.pagehelper</groupId>
                <artifactId>pagehelper</artifactId>
                <version>${pagehelper.version}</version>
            </dependency>
            <!-- aspectjweaver-->
            <dependency>
                <groupId>org.aspectj</groupId>
                <artifactId>aspectjweaver</artifactId>
                <version>${aspect.version}</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <!-- 公共依賴 -->
    <dependencies>
        <!-- spring-context -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!-- slf4j-log4j12 -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <!-- junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>${junit.version}</version>
        </dependency>
        <!-- druid -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>${druid.version}</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
        </dependency>
    </dependencies>
</project>

View Code

子級：git

<?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">
    <parent>
        <artifactId>conformity</artifactId>
        <groupId>edu.nf</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <artifactId>ch04</artifactId>
    <packaging>war</packaging>

    <dependencies>
        <!-- javax.servlet-api -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
        </dependency>
        <!-- spring-webmvc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
        </dependency>
        <!-- jackson -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
        </dependency>
        <!-- mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
        </dependency>
        <!-- mybatis整合spring插件 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
        </dependency>
        <!-- 分頁插件-->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
        </dependency>
        <!-- spring-jdbc-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
        </dependency>
        <!-- spring-tx-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
        </dependency>
        <!-- aspectjweaver -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
        </dependency>
    </dependencies>

    <!-- war插件 -->
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.2</version>
                <configuration>
                    <warSourceDirectory>web</warSourceDirectory>
                    <!-- 指定web.xml路徑 -->
                    <webXml>web\WEB-INF\web.xml</webXml>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

View Code

ssm所需jar包：github

2、配置web.xml文件

<?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">

    <!-- 當初始化不一樣的配置文件時，spring會初始化不一樣的容器對象，
     也就是會產生父子容器，子容器能夠共享父容器的內容，但父容器是不能
     訪問子容器的對象-->

    <!-- 配置監聽器去初始化applicationContext.xml -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <!-- 配置監聽器的初始化參數-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>
    
    <!-- 配置Spring提供的字符編碼過濾器 -->
    <filter>
        <filter-name>EncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <!-- 指定編碼 -->
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <!-- 讓response的編碼和request保持一致-->
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>EncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!-- WebStatFilter用於採集監控的數據-->
    <filter>
        <filter-name>DruidWebStatFilter</filter-name>
        <filter-class>com.alibaba.druid.support.http.WebStatFilter</filter-class>
        <init-param>
            <param-name>exclusions</param-name>
            <param-value>*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>DruidWebStatFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!-- 配置StatViewServlet，用於啓用監控視圖 -->
    <servlet>
        <servlet-name>DruidStatView</servlet-name>
        <servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>
        <init-param>
            <!-- 用戶名 -->
            <param-name>loginUsername</param-name>
            <param-value>root</param-value>
        </init-param>
        <init-param>
            <!-- 密碼 -->
            <param-name>loginPassword</param-name>
            <param-value>root</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>DruidStatView</servlet-name>
        <url-pattern>/druid/*</url-pattern>
    </servlet-mapping>

    <!-- 配置核心控制器 -->
    <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!-- 初始化mvc配置文件 -->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:dispatcher-servlet.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

View Code

3、配置dispatcher-servlet.xml

建立Springmvc核心配置文件web

<?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
       http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!-- 掃描相應的控制器組件,不包含Service以及Dao -->
    <context:component-scan base-package="edu.nf.ch04.controller"/>

    <!-- 啓用mvc註解驅動-->
    <mvc:annotation-driven/>

    <!-- 靜態資源處理-->
    <mvc:default-servlet-handler/>

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

</beans>

View Code

4、配置applicationContext.xml

建立Spring核心配置文件spring

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

    <!-- 啓用註解並掃描 -->
    <context:component-scan base-package="edu.nf.ch04">
        <!-- 排除控制層組件,也就是排除帶有@Controller註解的類 -->
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <!-- 配置數據源鏈接池 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
        <!-- 數據庫鏈接屬性 -->
        <property name="url" value="jdbc:mysql://localhost:3306/homework?useSSL=true&amp;useUnicode=true&amp;characterEncoding=utf-8"/>
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="username" value="root"/>
        <property name="password" value="root"/>
        <!-- 啓用系統監控過濾器 -->
        <property name="filters" value="stat"/>
        <!-- 最大鏈接池數量 -->
        <property name="maxActive" value="200"/>
        <!-- 初始化時創建物理鏈接的個數-->
        <property name="initialSize" value="5"/>
        <!-- 最小鏈接池數量-->
        <property name="minIdle" value="5"/>
        <!-- 獲取鏈接時最大等待時間，單位毫秒-->
        <property name="maxWait" value="60000"/>
        <!-- 銷燬線程會檢測鏈接的間隔時間，（單位毫秒）
        若是鏈接空閒時間大於等於minEvictableIdleTimeMillis則關閉物理鏈接-->
        <property name="timeBetweenEvictionRunsMillis" value="60000"/>
        <!-- 鏈接保持空閒而不被驅逐的最小時間 -->
        <property name="minEvictableIdleTimeMillis" value="300000"/>
        <!--申請鏈接的時候檢測，若是空閒時間大於timeBetweenEvictionRunsMillis，
        執行validationQuery檢測鏈接是否有效-->
        <property name="testWhileIdle" value="true"/>
        <!-- 申請鏈接時執行validationQuery檢測鏈接是否有效 -->
        <property name="testOnBorrow" value="false"/>
        <!-- 歸還鏈接時執行validationQuery檢測鏈接是否有效-->
        <property name="testOnReturn" value="false"/>
        <!-- 是否緩存preparedStatement, mysql建議關閉-->
        <property name="poolPreparedStatements" value="false"/>
        <!-- 僞SQL，用於檢查鏈接是否可用 -->
        <property name="validationQuery" value="select 1"/>
    </bean>

    <!-- 配置SqlSessionFactory,將mybatis的SqlSessionFactory交給Spring容器管理 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入druid數據源 -->
        <property name="dataSource" ref="dataSource"/>
        <!-- 給實體包下的類定義默認別名-->
        <property name="typeAliasesPackage" value="edu.nf.ch04.entity"/>
        <!-- 指定mapper映射配置文件的目錄-->
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
        <!-- 配置分頁插件-->
        <property name="plugins">
            <!-- 配置一個bean，指定分頁插件的攔截器-->
            <bean class="com.github.pagehelper.PageInterceptor">
                <property name="properties">
                    <!--配置攔截器的參數屬性 -->
                    <props>
                        <!-- 指定數據庫方言 -->
                        <prop key="helperDialect">mysql</prop>
                        <!-- 分頁參數使用註解支持-->
                        <prop key="supportMethodsArguments">true</prop>
                    </props>
                </property>
            </bean>
        </property>
    </bean>

    <!-- 指定掃描的dao接口的包,利用動態代理在運行時生成dao的實現類 -->
    <mybatis:scan base-package="edu.nf.ch04.dao"/>

    <!-- 裝配DataSource的事務管理器-->
    <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!-- 須要注入一個DataSource -->
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!-- 啓用事務註解驅動,transaction-manager引用上面定義的事務管理器的id，
    若是id的名稱就叫作transactionManager，那麼就不須要指定這個屬性，由於是默認值-->
    <tx:annotation-driven transaction-manager="txManager"/>
</beans>

View Code

mapper：ClassDao.xml 數據庫執行語句sql

<?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="edu.nf.ch04.dao.ClassDao">

    <resultMap id="classMap" type="classInfo">
        <id property="id" column="c_id"/>
        <result property="className" column="c_name"/>
    </resultMap>

    <select id="listClassInfo" resultMap="classMap">
        select * from class_info
    </select>

    <select id="getClassById" parameterType="integer" resultMap="classMap">
        select * from class_info where c_id = #{id}
    </select>

    <insert id="saveClassInfo" parameterType="classInfo">
        insert into class_info(c_name) values(#{className});
    </insert>

    <update id="updateClassInfo" parameterType="classInfo">
        update class_info set c_name = #{className}
    </update>

</mapper>

View Code

5、Log4j日誌的配置：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration>

    <!-- 指定日誌的輸出方式，ConsoleAppender表示輸出到控制檯 -->
    <appender name="console" class="org.apache.log4j.ConsoleAppender">
        <!-- 使用自定義佈局-->
        <layout class="org.apache.log4j.PatternLayout">
            <!-- 自定義佈局轉換參數說明
                 %d 日期格式
                 %p 輸出級別
                 %t 輸出當先執行線程名
                 %M 輸出當先運行的方法名
                 %l 輸出日誌事件的發生位置，包括類名、發生的線程，以及在代碼中的行數
                 %c 輸出當前的類名
                 %m 輸出日誌內容
                 %n 換行-->
            <param name="ConversionPattern" value="[%d{yyyy-MM-dd HH:mm:ss} %-5p] [%t] %l - %m%n" />
        </layout>
        <!-- 過濾輸出範圍-->
        <filter class="org.apache.log4j.varia.LevelRangeFilter">
            <param name="levelMin" value="debug" />
            <param name="levelMax" value="error" />
            <param name="AcceptOnMatch" value="true" />
        </filter>
    </appender>

    <!-- 配置log4j的root，默認全部日誌都將以root的配置進行輸出-->
    <root>
        <!-- 指定輸出級別，log4j一共分爲7個級別，由低到高分爲ALL、DEBUG、INFO、WARN、ERROR、FATAL、OFF
             但官方建議使用DEBUG、INFO、WARN、ERROR這4個級別。經過使用日誌級別，能夠控制應用程序中相應級別日誌信息的輸出。
             例如，若是使用了info級別，則應用程序中全部低於info級別的日誌信息(如debug)將不會被打印出來。-->
        <priority value ="debug"/>
        <!-- 引用輸出方式，ref對應appender的name -->
        <appender-ref ref="console"/>
    </root>

</log4j:configuration>

View Code

6、編寫代碼

Controller

BaseController：數據庫

package edu.nf.ch04.controller;

import edu.nf.ch04.controller.vo.ResponseVO;

/**
 * @author wangl
 * @date 2018/11/12
 * 父級控制器
 * 封裝了給子類調用的成功響應視圖的方法
 */
public class BaseController {

    protected ResponseVO success(){
        return new ResponseVO();
    }

    protected ResponseVO success(Object value){
        ResponseVO vo = new ResponseVO();
        vo.setValue(value);
        return vo;
    }

    protected ResponseVO success(Integer code, Object value){
        ResponseVO vo = new ResponseVO();
        vo.setCode(code);
        vo.setValue(value);
        return vo;
    }
}

View Code

ClassController：express

package edu.nf.ch04.controller;

import edu.nf.ch04.controller.vo.ResponseVO;
import edu.nf.ch04.entity.ClassInfo;
import edu.nf.ch04.servie.ClassService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.List;

/**
 * @author wangl
 * @date 2018/11/12
 */
@Controller
public class ClassController extends BaseController{

    /**
     * 日誌對象
     */
    private static final Logger logger = LoggerFactory.getLogger(ClassController.class);

    /**
     * 注入對象
     */
    @Autowired
    private ClassService classService;

    @GetMapping("/listClassInfo")
    @ResponseBody
    public ResponseVO listClassInfo(Integer pageNum, Integer pageSize){
        List<ClassInfo> list = classService.listClassInfo(pageNum, pageSize);
        logger.info("查詢用戶列表: " + list.size());
        return success(list);
    }

    @PostMapping("/add")
    public ResponseVO addClass(ClassInfo classInfo){
        classService.saveClassInfo(classInfo);
        return success();
    }
}

View Code

advice（GlobalExceptionHandler）：異常處理類

package edu.nf.ch04.controller.advice;


import edu.nf.ch04.controller.vo.ResponseVO;
import edu.nf.ch04.servie.DataAccessException;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;

/**
 * @author wangl
 * @date 2018/11/12
 * 定義一個全局的異常處理類（相似一個切面）
 * 這個類中定義的全部方法都是異常處理方法，
 * 也能夠理解爲是全局的異常通知
 * value屬性指定對哪些控制器進行切入攔截
 */
@ControllerAdvice
public class GlobalExceptionHandler {

    /**
     * 全局異常處理方法
     * 用於處理參數異常
     * @param e
     * @return
     */
    @ExceptionHandler(DataAccessException.class)
    @ResponseBody
    public ResponseVO handleDataAccessException(DataAccessException e){
        ResponseVO vo = new ResponseVO();
        //設置相應狀態碼以及異常信息
        vo.setCode(HttpStatus.INTERNAL_SERVER_ERROR.value());
        vo.setMessage(e.getMessage());
        return vo;
    }
}

View Code

vo響應視圖

package edu.nf.ch04.controller.vo;

import org.springframework.http.HttpStatus;

/**
 * @author wangl
 * @date 2018/11/12
 * 響應視圖
 */
public class ResponseVO {

    private Integer code = HttpStatus.OK.value();

    private String message;

    private Object value;

    public Integer getCode() {
        return code;
    }

    public void setCode(Integer code) {
        this.code = code;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public Object getValue() {
        return value;
    }

    public void setValue(Object value) {
        this.value = value;
    }

    @Override
    public String toString() {
        return "ResponseVO{" +
                "code=" + code +
                ", message='" + message + '\'' +
                ", value=" + value +
                '}';
    }
}

View Code

Service

自定義異常DataAccessException：

package edu.nf.ch04.servie;

/**
 * @author wangl
 * @date 2018/11/12
 */
public class DataAccessException extends RuntimeException{

    public DataAccessException(String message) {
        super(message);
    }

    public DataAccessException(String message, Throwable cause) {
        super(message, cause);
    }

    public DataAccessException(Throwable cause) {
        super(cause);
    }
}

View Code

業務層接口ClassService

package edu.nf.ch04.servie;

import edu.nf.ch04.entity.ClassInfo;

import java.util.List;

/**
 * @author wangl
 * @date 2018/11/8
 */
public interface ClassService {

    /**
     * 查詢班級信息
     * @param pageNum
     * @param pageSize
     * @return
     */
    List<ClassInfo> listClassInfo(Integer pageNum, Integer pageSize);

    /**
     * 根據id查詢班級信息
     * @param id
     * @return
     */
    ClassInfo getClassById(Integer id);

    /**
     * 新建班級信息
     * @param classInfo
     */
    void saveClassInfo(ClassInfo classInfo);

    /**
     * 修改班級信息
     * @param classInfo
     */
    void updateClassInfo(ClassInfo classInfo);
}

View Code

業務層實現類ClassServiceImpl

package edu.nf.ch04.servie.impl;

import edu.nf.ch04.dao.ClassDao;
import edu.nf.ch04.entity.ClassInfo;
import edu.nf.ch04.servie.ClassService;
import edu.nf.ch04.servie.DataAccessException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

/**
 * @author wangl
 * @date 2018/11/8
 * @Transactional 事務註解
 */
@Service("classService")
@Transactional(rollbackFor = RuntimeException.class)
public class ClassServiceImpl implements ClassService {

    @Autowired
    private ClassDao classDao;

    @Transactional(rollbackFor = RuntimeException.class, propagation = Propagation.SUPPORTS, readOnly = true)
    @Override
    public List<ClassInfo> listClassInfo(Integer pageNum, Integer pageSize) {
        return classDao.listClassInfo(pageNum, pageSize);
    }

    @Transactional(rollbackFor = RuntimeException.class, propagation = Propagation.SUPPORTS, readOnly = true)
    @Override
    public ClassInfo getClassById(Integer id) {
        return classDao.getClassById(id);
    }

    @Override
    public void saveClassInfo(ClassInfo classInfo) {
        try {
            classDao.saveClassInfo(classInfo);
        } catch (RuntimeException e) {
            e.printStackTrace();
            throw new DataAccessException("添加失敗");
        }
    }

    @Override
    public void updateClassInfo(ClassInfo classInfo) {
        try {
            classDao.updateClassInfo(classInfo);
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException("修改失敗");
        }
    }
}

View Code

Dao（ClassDao持久層接口）

package edu.nf.ch04.dao;

import edu.nf.ch04.entity.ClassInfo;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository;

import java.util.List;

/**
 * @author wangl
 * @date 2018/11/8
 */
@Repository
public interface ClassDao {

    /**
     * 查詢班級列表信息
     * @param pageNum
     * @param pageSize
     * @return
     */
    List<ClassInfo> listClassInfo(@Param("pageNum") Integer pageNum, @Param("pageSize") Integer pageSize);

    /**
     * 根據id查詢班級信息
     * @param id
     * @return
     */
    ClassInfo getClassById(Integer id);

    /**
     * 新建班級信息
     * @param classInfo
     */
    void saveClassInfo(ClassInfo classInfo);

    /**
     * 修改班級信息
     * @param classInfo
     */
    void updateClassInfo(ClassInfo classInfo);
}

View Code

Entity（ClassInfo 實體類）

package edu.nf.ch04.entity;

/**
 * @author wangl
 * @date 2018/11/8
 */
public class ClassInfo {

    private Integer id;

    private String className;

    public Integer getId() {
        return id;
    }

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

    public String getClassName() {
        return className;
    }

    public void setClassName(String className) {
        this.className = className;
    }

    @Override
    public String toString() {
        return "ClassInfo{" +
                "id=" + id +
                ", className='" + className + '\'' +
                '}';
    }
}