<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.soecode.ssm</groupid>
 ssm</artifactid>
 <packaging>war</packaging>
 <version>0.0.1-SNAPSHOT</version>
 <name>ssm Maven Webapp</name>
 <url>http://github.com/liyifeng1994/ssm</url>
 <dependencies>
 <!-- 單元測(cè)試 -->
 <dependency>
 <groupid>junit</groupid>
 junit</artifactid>
 <version>4.11</version>
 </dependency>
 
 <!-- 1.日志 -->
 <!-- 實(shí)現(xiàn)slf4j接口并整合 -->
 <dependency>
 <groupid>ch.qos.logback</groupid>
 logback-classic</artifactid>
 <version>1.1.1</version>
 </dependency>
 
 <!-- 2.數(shù)據(jù)庫(kù) -->
 <dependency>
 <groupid>mysql</groupid>
 mysql-connector-java</artifactid>
 <version>5.1.37</version>
 <scope>runtime</scope>
 </dependency>
 <dependency>
 <groupid>c3p0</groupid>
 c3p0</artifactid>
 <version>0.9.1.2</version>
 </dependency>
 
 <!-- DAO: MyBatis -->
 <dependency>
 <groupid>org.mybatis</groupid>
 mybatis</artifactid>
 <version>3.3.0</version>
 </dependency>
 <dependency>
 <groupid>org.mybatis</groupid>
 mybatis-spring</artifactid>
 <version>1.2.3</version>
 </dependency>
 
 <!-- 3.Servlet web -->
 <dependency>
 <groupid>taglibs</groupid>
 standard</artifactid>
 <version>1.1.2</version>
 </dependency>
 <dependency>
 <groupid>jstl</groupid>
 jstl</artifactid>
 <version>1.2</version>
 </dependency>
 <dependency>
 <groupid>com.fasterxml.jackson.core</groupid>
 jackson-databind</artifactid>
 <version>2.5.4</version>
 </dependency>
 <dependency>
 <groupid>javax.servlet</groupid>
 javax.servlet-api</artifactid>
 <version>3.1.0</version>
 </dependency>
 
 <!-- 4.Spring -->
 <!-- 1)Spring核心 -->
 <dependency>
 <groupid>org.springframework</groupid>
 spring-core</artifactid>
 <version>4.1.7.RELEASE</version>
 </dependency>
 <dependency>
 <groupid>org.springframework</groupid>
 spring-beans</artifactid>
 <version>4.1.7.RELEASE</version>
 </dependency>
 <dependency>
 <groupid>org.springframework</groupid>
 spring-context</artifactid>
 <version>4.1.7.RELEASE</version>
 </dependency>
 <!-- 2)Spring DAO層 -->
 <dependency>
 <groupid>org.springframework</groupid>
 spring-jdbc</artifactid>
 <version>4.1.7.RELEASE</version>
 </dependency>
 <dependency>
 <groupid>org.springframework</groupid>
 spring-tx</artifactid>
 <version>4.1.7.RELEASE</version>
 </dependency>
 <!-- 3)Spring web -->
 <dependency>
 <groupid>org.springframework</groupid>
 spring-web</artifactid>
 <version>4.1.7.RELEASE</version>
 </dependency>
 <dependency>
 <groupid>org.springframework</groupid>
 spring-webmvc</artifactid>
 <version>4.1.7.RELEASE</version>
 </dependency>
 <!-- 4)Spring test -->
 <dependency>
 <groupid>org.springframework</groupid>
 spring-test</artifactid>
 <version>4.1.7.RELEASE</version>
 </dependency>
 
 <!-- redis客戶端:Jedis -->
 <dependency>
 <groupid>redis.clients</groupid>
 jedis</artifactid>
 <version>2.7.3</version>
 </dependency>
 <dependency>
 <groupid>com.dyuproject.protostuff</groupid>
 <artifactid>protostuff-core</artifactid>
 <version>1.0.8</version>
 </dependency>
 <dependency>
 <groupid>com.dyuproject.protostuff</groupid>
 <artifactid>protostuff-runtime</artifactid>
 <version>1.0.8</version>
 </dependency>
 
 <!-- Map工具類 -->
 <dependency>
 <groupid>commons-collections</groupid>
 <artifactid>commons-collections</artifactid>
 <version>3.2</version>
 </dependency>
 </dependencies>
 <build>
 <finalname>ssm</finalname>
 </build>
</project>

<?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
 http://www.springframework.org/schema/context/spring-context.xsd">
 <!-- 配置整合mybatis過(guò)程 -->
 <!-- 1.配置數(shù)據(jù)庫(kù)相關(guān)參數(shù)properties的屬性：${url} -->
 <context:property-placeholder location="classpath:jdbc.properties" />

 <!-- 2.數(shù)據(jù)庫(kù)連接池 -->
 <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
 <!-- 配置連接池屬性 -->
 <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連接池的私有屬性 -->
 <property name="maxPoolSize" value="30" />
 <property name="minPoolSize" value="10" />
 <!-- 關(guān)閉連接后不自動(dòng)commit -->
 <property name="autoCommitOnClose" value="false" />
 <!-- 獲取連接超時(shí)時(shí)間 -->
 <property name="checkoutTimeout" value="10000" />
 <!-- 當(dāng)獲取連接失敗重試次數(shù) -->
 <property name="acquireRetryAttempts" value="2" />
 </bean>

 <!-- 3.配置SqlSessionFactory對(duì)象 -->
 <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
 <!-- 注入數(shù)據(jù)庫(kù)連接池 -->
 <property name="dataSource" ref="dataSource" />
 <!-- 配置MyBaties全局配置文件:mybatis-config.xml -->
 <property name="configLocation" value="classpath:mybatis-config.xml" />
 <!-- 掃描entity包 使用別名 -->
 <property name="typeAliasesPackage" value="com.soecode.lyf.entity" />
 <!-- 掃描sql配置文件:mapper需要的xml文件 -->
 <property name="mapperLocations" value="classpath:mapper/*.xml" />
 </bean>

 <!-- 4.配置掃描Dao接口包，動(dòng)態(tài)實(shí)現(xiàn)Dao接口，注入到spring容器中 -->
 <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
 <!-- 注入sqlSessionFactory -->
 <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
 <!-- 給出需要掃描Dao接口包 -->
 <property name="basePackage" value="com.soecode.lyf.dao" />
 </bean>
</beans>

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3307/ssm?useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=

<?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獲取數(shù)據(jù)庫(kù)自增主鍵值 -->
 <setting name="useGeneratedKeys" value="true" />

 <!-- 使用列別名替換列名 默認(rèn):true -->
 <setting name="useColumnLabel" value="true" />

 <!-- 開(kāi)啟駝峰命名轉(zhuǎn)換:Table{create_time} -> Entity{createTime} -->
 <setting name="mapUnderscoreToCamelCase" value="true" />
 </settings>
</configuration>

<?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: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://www.springframework.org/schema/tx
 http://www.springframework.org/schema/tx/spring-tx.xsd">
 <!-- 掃描service包下所有使用注解的類型 -->
 <context:component-scan base-package="com.soecode.lyf.service" />

 <!-- 配置事務(wù)管理器 -->
 <bean id="transactionManager"
 class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
 <!-- 注入數(shù)據(jù)庫(kù)連接池 -->
 <property name="dataSource" ref="dataSource" />
 </bean>

 <!-- 配置基于注解的聲明式事務(wù) -->
 <tx:annotation-driven transaction-manager="transactionManager" />
</beans>

<?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-3.0.xsd">
 <!-- 配置SpringMVC -->
 <!-- 1.開(kāi)啟SpringMVC注解模式 -->
 <!-- 簡(jiǎn)化配置： 
 (1)自動(dòng)注冊(cè)DefaultAnootationHandlerMapping,AnotationMethodHandlerAdapter 
 (2)提供一些列：數(shù)據(jù)綁定，數(shù)字和日期的format @NumberFormat, @DateTimeFormat, xml,json默認(rèn)讀寫支持 
 -->
 <mvc:annotation-driven />

 <!-- 2.靜態(tài)資源默認(rèn)servlet配置
 (1)加入對(duì)靜態(tài)資源的處理：js,gif,png
 (2)允許使用"/"做整體映射
 -->
 <mvc:default-servlet-handler/>

 <!-- 3.配置jsp 顯示ViewResolver -->
 <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
 <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
 <property name="prefix" value="/WEB-INF/jsp/" />
 <property name="suffix" value=".jsp" />
 </bean>

 <!-- 4.掃描web相關(guān)的bean -->
 <context:component-scan base-package="com.soecode.lyf.web" />
</beans>

<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_3_1.xsd"
 version="3.1" metadata-complete="true">
 <!-- 如果是用mvn命令生成的xml，需要修改servlet版本為3.1 -->
 <!-- 配置DispatcherServlet -->
 <servlet>
 <servlet-name>seckill-dispatcher</servlet-name>
 <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
 <!-- 配置springMVC需要加載的配置文件
 spring-dao.xml,spring-service.xml,spring-web.xml
 Mybatis - > spring -> springmvc
 -->
 <init-param>
 <param-name>contextConfigLocation</param-name>
 <param-value>classpath:spring/spring-*.xml</param-value>
 </init-param>
 </servlet>
 <servlet-mapping>
 <servlet-name>seckill-dispatcher</servlet-name>
 <!-- 默認(rèn)匹配所有的請(qǐng)求 -->
 <url-pattern>/</url-pattern>
 </servlet-mapping>
</web-app>

<?xml version="1.0" encoding="UTF-8"?>
<configuration debug="true">
 <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
 <!-- encoders are by default assigned the type ch.qos.logback.classic.encoder.PatternLayoutEncoder -->
 <encoder>
 <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
 </encoder>
 </appender>

 <root level="debug">
 <appender-ref ref="STDOUT" />
 </root>
</configuration>

-- 創(chuàng)建圖書表
CREATE TABLE `book` (
 `book_id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '圖書ID',
 `name` varchar(100) NOT NULL COMMENT '圖書名稱',
 `number` int(11) NOT NULL COMMENT '館藏?cái)?shù)量',
 PRIMARY KEY (`book_id`)
) ENGINE=InnoDB AUTO_INCREMENT=1000 DEFAULT CHARSET=utf8 COMMENT='圖書表'

-- 初始化圖書數(shù)據(jù)
INSERT INTO `book` (`book_id`, `name`, `number`)
VALUES
 (1000, 'Java程序設(shè)計(jì)', 10),
 (1001, '數(shù)據(jù)結(jié)構(gòu)', 10),
 (1002, '設(shè)計(jì)模式', 10),
 (1003, '編譯原理', 10)

-- 創(chuàng)建預(yù)約圖書表
CREATE TABLE `appointment` (
 `book_id` bigint(20) NOT NULL COMMENT '圖書ID',
 `student_id` bigint(20) NOT NULL COMMENT '學(xué)號(hào)',
 `appoint_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '預(yù)約時(shí)間' ,
 PRIMARY KEY (`book_id`, `student_id`),
 INDEX `idx_appoint_time` (`appoint_time`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='預(yù)約圖書表'

package com.soecode.lyf.entity;

public class Book {

 private long bookId;// 圖書ID

 private String name;// 圖書名稱

 private int number;// 館藏?cái)?shù)量

 // 省略構(gòu)造方法，getter和setter方法，toString方法

}

package com.soecode.lyf.entity;

import java.util.Date;

/**
 * 預(yù)約圖書實(shí)體
 */
public class Appointment {

 private long bookId;// 圖書ID

 private long studentId;// 學(xué)號(hào)

 private Date appointTime;// 預(yù)約時(shí)間

 // 多對(duì)一的復(fù)合屬性
 private Book book;// 圖書實(shí)體

 // 省略構(gòu)造方法，getter和setter方法，toString方法

}

package com.soecode.lyf.dao;

import java.util.List;

import com.soecode.lyf.entity.Book;

public interface BookDao {

 /**
 * 通過(guò)ID查詢單本圖書
 * 
 * @param id
 * @return
 */
 Book queryById(long id);

 /**
 * 查詢所有圖書
 * 
 * @param offset 查詢起始位置
 * @param limit 查詢條數(shù)
 * @return
 */
 List<Book> queryAll(@Param("offset") int offset, @Param("limit") int limit);

 /**
 * 減少館藏?cái)?shù)量
 * 
 * @param bookId
 * @return 如果影響行數(shù)等于>1，表示更新的記錄行數(shù)
 */
 int reduceNumber(long bookId);
}

package com.soecode.lyf.dao;

import org.apache.ibatis.annotations.Param;

import com.soecode.lyf.entity.Appointment;

public interface AppointmentDao {

 /**
 * 插入預(yù)約圖書記錄
 * 
 * @param bookId
 * @param studentId
 * @return 插入的行數(shù)
 */
 int insertAppointment(@Param("bookId") long bookId, @Param("studentId") long studentId);

 /**
 * 通過(guò)主鍵查詢預(yù)約圖書記錄，并且攜帶圖書實(shí)體
 * 
 * @param bookId
 * @param studentId
 * @return
 */
 Appointment queryByKeyWithBook(@Param("bookId") long bookId, @Param("studentId") long studentId);

}

<?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.soecode.lyf.dao.BookDao">
 <!-- 目的：為dao接口方法提供sql語(yǔ)句配置 -->
 <select id="queryById" resultType="Book" parameterType="long">
 <!-- 具體的sql -->
 SELECT
 book_id,
 name,
 number
 FROM
 book
 WHERE
 book_id = #{bookId}
 </select>

 <select id="queryAll" resultType="Book">
 SELECT
 book_id,
 name,
 number
 FROM
 book
 ORDER BY
 book_id
 LIMIT #{offset}, #{limit}
 </select>

 <update id="reduceNumber">
 UPDATE book
 SET number = number - 1
 WHERE
 book_id = #{bookId}
 AND number > 0
 </update>
</mapper>

<?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.soecode.lyf.dao.AppointmentDao">
 <insert id="insertAppointment">
 <!-- ignore 主鍵沖突，報(bào)錯(cuò) -->
 INSERT ignore INTO appointment (book_id, student_id)
 VALUES (#{bookId}, #{studentId})
 </insert>

 <select id="queryByKeyWithBook" resultType="Appointment">
 <!-- 如何告訴MyBatis把結(jié)果映射到Appointment同時(shí)映射book屬性 -->
 <!-- 可以自由控制SQL -->
 SELECT
 a.book_id,
 a.student_id,
 a.appoint_time,
 b.book_id "book.book_id",
 b.`name` "book.name",
 b.number "book.number"
 FROM
 appointment a
 INNER JOIN book b ON a.book_id = b.book_id
 WHERE
 a.book_id = #{bookId}
 AND a.student_id = #{studentId}
 </select>
</mapper>

package com.soecode.lyf;

import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

/**
 * 配置spring和junit整合，junit啟動(dòng)時(shí)加載springIOC容器 spring-test,junit
 */
@RunWith(SpringJUnit4ClassRunner.class)
// 告訴junit spring配置文件
@ContextConfiguration({ "classpath:spring/spring-dao.xml", "classpath:spring/spring-service.xml" })
public class BaseTest {

}

package com.soecode.lyf.dao;

import java.util.List;

import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;

import com.soecode.lyf.BaseTest;
import com.soecode.lyf.entity.Book;

public class BookDaoTest extends BaseTest {

 @Autowired
 private BookDao bookDao;

 @Test
 public void testQueryById() throws Exception {
 long bookId = 1000;
 Book book = bookDao.queryById(bookId);
 System.out.println(book);
 }

 @Test
 public void testQueryAll() throws Exception {
 List<Book> books = bookDao.queryAll(0, 4);
 for (Book book : books) {
 System.out.println(book);
 }
 }

 @Test
 public void testReduceNumber() throws Exception {
 long bookId = 1000;
 int update = bookDao.reduceNumber(bookId);
 System.out.println("update=" + update);
 }

}

package com.soecode.lyf.dao;

import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;

import com.soecode.lyf.BaseTest;
import com.soecode.lyf.entity.Appointment;

public class AppointmentDaoTest extends BaseTest {

 @Autowired
 private AppointmentDao appointmentDao;

 @Test
 public void testInsertAppointment() throws Exception {
 long bookId = 1000;
 long studentId = 12345678910L;
 int insert = appointmentDao.insertAppointment(bookId, studentId);
 System.out.println("insert=" + insert);
 }

 @Test
 public void testQueryByKeyWithBook() throws Exception {
 long bookId = 1000;
 long studentId = 12345678910L;
 Appointment appointment = appointmentDao.queryByKeyWithBook(bookId, studentId);
 System.out.println(appointment);
 System.out.println(appointment.getBook());
 }

}

package com.soecode.lyf.enums;

/**
 * 使用枚舉表述常量數(shù)據(jù)字典
 */
public enum AppointStateEnum {

 SUCCESS(1, "預(yù)約成功"), NO_NUMBER(0, "庫(kù)存不足"), REPEAT_APPOINT(-1, "重復(fù)預(yù)約"), INNER_ERROR(-2, "系統(tǒng)異常");

 private int state;

 private String stateInfo;

 private AppointStateEnum(int state, String stateInfo) {
 this.state = state;
 this.stateInfo = stateInfo;
 }

 public int getState() {
 return state;
 }

 public String getStateInfo() {
 return stateInfo;
 }

 public static AppointStateEnum stateOf(int index) {
 for (AppointStateEnum state : values()) {
 if (state.getState() == index) {
 return state;
 }
 }
 return null;
 }

}

package com.soecode.lyf.dto;

import com.soecode.lyf.entity.Appointment;
import com.soecode.lyf.enums.AppointStateEnum;

/**
 * 封裝預(yù)約執(zhí)行后結(jié)果
 */
public class AppointExecution {

 // 圖書ID
 private long bookId;

 // 秒殺預(yù)約結(jié)果狀態(tài)
 private int state;

 // 狀態(tài)標(biāo)識(shí)
 private String stateInfo;

 // 預(yù)約成功對(duì)象
 private Appointment appointment;

 public AppointExecution() {
 }

 // 預(yù)約失敗的構(gòu)造器
 public AppointExecution(long bookId, AppointStateEnum stateEnum) {
 this.bookId = bookId;
 this.state = stateEnum.getState();
 this.stateInfo = stateEnum.getStateInfo();
 }

 // 預(yù)約成功的構(gòu)造器
 public AppointExecution(long bookId, AppointStateEnum stateEnum, Appointment appointment) {
 this.bookId = bookId;
 this.state = stateEnum.getState();
 this.stateInfo = stateEnum.getStateInfo();
 this.appointment = appointment;
 }

 // 省略getter和setter方法，toString方法

}

package com.soecode.lyf.exception;

/**
 * 庫(kù)存不足異常
 */
public class NoNumberException extends RuntimeException {

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

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

}

package com.soecode.lyf.exception;

/**
 * 重復(fù)預(yù)約異常
 */
public class RepeatAppointException extends RuntimeException {

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

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

}

package com.soecode.lyf.exception;

/**
 * 預(yù)約業(yè)務(wù)異常
 */
public class AppointException extends RuntimeException {

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

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

}

package com.soecode.lyf.service;

import java.util.List;

import com.soecode.lyf.dto.AppointExecution;
import com.soecode.lyf.entity.Book;

/**
 * 業(yè)務(wù)接口：站在"使用者"角度設(shè)計(jì)接口 三個(gè)方面：方法定義粒度，參數(shù)，返回類型（return 類型/異常）
 */
public interface BookService {

 /**
 * 查詢一本圖書
 * 
 * @param bookId
 * @return
 */
 Book getById(long bookId);

 /**
 * 查詢所有圖書
 * 
 * @return
 */
 List<Book> getList();

 /**
 * 預(yù)約圖書
 * 
 * @param bookId
 * @param studentId
 * @return
 */
 AppointExecution appoint(long bookId, long studentId);

}

package com.soecode.lyf.service.impl;

import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.soecode.lyf.dao.AppointmentDao;
import com.soecode.lyf.dao.BookDao;
import com.soecode.lyf.dto.AppointExecution;
import com.soecode.lyf.entity.Appointment;
import com.soecode.lyf.entity.Book;
import com.soecode.lyf.enums.AppointStateEnum;
import com.soecode.lyf.exception.AppointException;
import com.soecode.lyf.exception.NoNumberException;
import com.soecode.lyf.exception.RepeatAppointException;
import com.soecode.lyf.service.BookService;

@Service
public class BookServiceImpl implements BookService {

 private Logger logger = LoggerFactory.getLogger(this.getClass());

 // 注入Service依賴
 @Autowired
 private BookDao bookDao;

 @Autowired
 private AppointmentDao appointmentDao;


 @Override
 public Book getById(long bookId) {
 return bookDao.queryById(bookId);
 }

 @Override
 public List<Book> getList() {
 return bookDao.queryAll(0, 1000);
 }

 @Override
 @Transactional
 /**
 * 使用注解控制事務(wù)方法的優(yōu)點(diǎn)： 1.開(kāi)發(fā)團(tuán)隊(duì)達(dá)成一致約定，明確標(biāo)注事務(wù)方法的編程風(fēng)格
 * 2.保證事務(wù)方法的執(zhí)行時(shí)間盡可能短，不要穿插其他網(wǎng)絡(luò)操作，RPC/HTTP請(qǐng)求或者剝離到事務(wù)方法外部
 * 3.不是所有的方法都需要事務(wù)，如只有一條修改操作，只讀操作不需要事務(wù)控制
 */
 public AppointExecution appoint(long bookId, long studentId) {
 try {
 // 減庫(kù)存
 int update = bookDao.reduceNumber(bookId);
 if (update <= 0) {// 庫(kù)存不足
 //return new AppointExecution(bookId, AppointStateEnum.NO_NUMBER);//錯(cuò)誤寫法 
 throw new NoNumberException("no number");
 } else {
 // 執(zhí)行預(yù)約操作
 int insert = appointmentDao.insertAppointment(bookId, studentId);
 if (insert <= 0) {// 重復(fù)預(yù)約
 //return new AppointExecution(bookId, AppointStateEnum.REPEAT_APPOINT);//錯(cuò)誤寫法
 throw new RepeatAppointException("repeat appoint");
 } else {// 預(yù)約成功
 Appointment appointment = appointmentDao.queryByKeyWithBook(bookId, studentId);
 return new AppointExecution(bookId, AppointStateEnum.SUCCESS, appointment);
 }
 }
 // 要先于catch Exception異常前先catch住再拋出，不然自定義的異常也會(huì)被轉(zhuǎn)換為AppointException，導(dǎo)致控制層無(wú)法具體識(shí)別是哪個(gè)異常
 } catch (NoNumberException e1) {
 throw e1;
 } catch (RepeatAppointException e2) {
 throw e2;
 } catch (Exception e) {
 logger.error(e.getMessage(), e);
 // 所有編譯期異常轉(zhuǎn)換為運(yùn)行期異常
 //return new AppointExecution(bookId, AppointStateEnum.INNER_ERROR);//錯(cuò)誤寫法
 throw new AppointException("appoint inner error:" + e.getMessage());
 }
 }

}

package com.soecode.lyf.service.impl;

import static org.junit.Assert.fail;

import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;

import com.soecode.lyf.BaseTest;
import com.soecode.lyf.dto.AppointExecution;
import com.soecode.lyf.service.BookService;

public class BookServiceImplTest extends BaseTest {

 @Autowired
 private BookService bookService;

 @Test
 public void testAppoint() throws Exception {
 long bookId = 1001;
 long studentId = 12345678910L;
 AppointExecution execution = bookService.appoint(bookId, studentId);
 System.out.println(execution);
 }

}

package com.soecode.lyf.dto;

/**
 * 封裝json對(duì)象，所有返回結(jié)果都使用它
 */
public class Result<T> {

 private boolean success;// 是否成功標(biāo)志

 private T data;// 成功時(shí)返回的數(shù)據(jù)

 private String error;// 錯(cuò)誤信息

 public Result() {
 }

 // 成功時(shí)的構(gòu)造器
 public Result(boolean success, T data) {
 this.success = success;
 this.data = data;
 }

 // 錯(cuò)誤時(shí)的構(gòu)造器
 public Result(boolean success, String error) {
 this.success = success;
 this.error = error;
 }

 // 省略getter和setter方法
}

package com.soecode.lyf.web;

import java.util.List;

import org.apache.ibatis.annotations.Param;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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 org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import com.soecode.lyf.dto.AppointExecution;
import com.soecode.lyf.dto.Result;
import com.soecode.lyf.entity.Book;
import com.soecode.lyf.enums.AppointStateEnum;
import com.soecode.lyf.exception.NoNumberException;
import com.soecode.lyf.exception.RepeatAppointException;
import com.soecode.lyf.service.BookService;

@Controller
@RequestMapping("/book") // url:/模塊/資源/{id}/細(xì)分 /seckill/list
public class BookController {

 private Logger logger = LoggerFactory.getLogger(this.getClass());

 @Autowired
 private BookService bookService;

 @RequestMapping(value = "/list", method = RequestMethod.GET)
 private String list(Model model) {
 List<Book> list = bookService.getList();
 model.addAttribute("list", list);
 // list.jsp + model = ModelAndView
 return "list";// WEB-INF/jsp/"list".jsp
 }

 @RequestMapping(value = "/{bookId}/detail", method = RequestMethod.GET)
 private String detail(@PathVariable("bookId") Long bookId, Model model) {
 if (bookId == null) {
 return "redirect:/book/list";
 }
 Book book = bookService.getById(bookId);
 if (book == null) {
 return "forward:/book/list";
 }
 model.addAttribute("book", book);
 return "detail";
 }

 //ajax json
 @RequestMapping(value = "/{bookId}/appoint", method = RequestMethod.POST, produces = {
 "application/json; charset=utf-8" })
 @ResponseBody
 private Result<AppointExecution> appoint(@PathVariable("bookId") Long bookId, @RequestParam("studentId") Long studentId) {
 if (studentId == null || studentId.equals("")) {
 return new Result<>(false, "學(xué)號(hào)不能為空");
 }
 //AppointExecution execution = bookService.appoint(bookId, studentId);//錯(cuò)誤寫法，不能統(tǒng)一返回，要處理異常（失?。┣闆r
 AppointExecution execution = null;
 try {
 execution = bookService.appoint(bookId, studentId);
 } catch (NoNumberException e1) {
 execution = new AppointExecution(bookId, AppointStateEnum.NO_NUMBER);
 } catch (RepeatAppointException e2) {
 execution = new AppointExecution(bookId, AppointStateEnum.REPEAT_APPOINT);
 } catch (Exception e) {
 execution = new AppointExecution(bookId, AppointStateEnum.INNER_ERROR);
 }
 return new Result<AppointExecution>(true, execution);
 }

}